initial deploy: hardened mainnet build

.env.example

@@ -0,0 +1,18 @@
+# Network selection: "stellar:testnet" (default) or "stellar:public"
+# Set to stellar:public for mainnet deployments
+NETWORK=stellar:testnet
+
+# Stellar public key to receive payments (starts with G...)
+# Must match the network selected above
+PAY_TO=
+
+# Stellar secret key for the server — used to send refunds (starts with S...)
+# Must match the network selected above; needs USDC trustline + small balance
+SERVER_SECRET=
+
+# Client's Stellar secret key — for demo-client.js only (starts with S...)
+# Must match the network selected above
+DEMO_PRIVATE_KEY=
+
+# Optional: override x402 facilitator URL (default: https://www.x402.org/facilitator)
+# FACILITATOR_URL=

.gitignore

@@ -0,0 +1,13 @@
+node_modules/
+.env
+test_*.py
+bench_*.py
+__pycache__/
+docs/superpowers/
+
+# Tooling/agent CLI configs (local only)
+.pi/
+.qwen/
+
+# One-off experiment scripts
+test-obscura.sh

Dockerfile

@@ -0,0 +1,26 @@
+FROM node:22-slim
+
+# Install Playwright system dependencies
+RUN apt-get update && apt-get install -y \
+    libnss3 libatk1.0-0 libatk-bridge2.0-0 libcups2 libdrm2 \
+    libxkbcommon0 libxcomposite1 libxdamage1 libxfixes3 libxrandr2 \
+    libgbm1 libpango-1.0-0 libcairo2 libasound2 libatspi2.0-0 \
+    fonts-liberation fonts-noto-color-emoji \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+# Install Playwright Chromium as node user (matches runtime user)
+USER node
+RUN npx playwright install chromium
+
+COPY --chown=node:node server.js renderer.js refund.js ./
+
+ENV PORT=7860
+
+EXPOSE 7860
+
+CMD ["node", "server.js"]

README.md

@@ -1,10 +1,281 @@
 ---
-title: Rendergate Mainnet
-emoji: 🦀
-colorFrom: red
-colorTo: pink
+title: RenderGate
+emoji: 🔍
+colorFrom: blue
+colorTo: purple
 sdk: docker
-pinned: false
+app_port: 7860
 ---
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+# RenderGate
+
+**Pay-per-render headless browser API, powered by x402 micropayments on Stellar.**
+
+**Live service:** https://tantk-rendergate.hf.space
+
+## Why Agents Need This
+
+Most AI agents are just HTTP clients — they call `fetch()` or `curl` and that's it. No browser engine, no JavaScript execution. When they hit a modern website, they get an empty HTML shell back.
+
+This affects every major agent framework:
+- **Claude Code** — `WebFetch` is HTTP GET only, no JS rendering
+- **OpenAI Codex / GPT agents** — HTTP-based tools
+- **LangChain / CrewAI agents** — Python `requests` library
+- **Trading bots / arb agents** — lightweight scripts, no browser
+- **MCP-based agents** — whatever tools they have, usually plain HTTP
+
+**Why can't agents just install a browser?**
+- Chromium is **500MB+** — too heavy for serverless, Lambda, or lightweight containers
+- Needs system-level dependencies (`libnss3`, `libgbm`, etc.) — not a simple `npm install`
+- Each render uses **200-500MB RAM** — agents on minimal infra can't afford this
+- Browser management is complex — crashes, timeouts, memory leaks, concurrency
+
+**RenderGate:** The agent pays $0.001 USDC and gets fully rendered content in one HTTP call. No browser install, no dependencies, no memory overhead. Heavy lifting happens on our infra. This is the x402 model — pay for compute you can't or don't want to run yourself.
+
+## How It Works
+
+1. Agent requests `GET /render?url=https://x.com/stellarorg`
+2. Server responds with **402 Payment Required** + Stellar payment instructions
+3. Agent signs a $0.001 USDC payment on Stellar testnet
+4. Server verifies payment via x402 facilitator, settles on-chain (~5s)
+5. Playwright renders the page with smart wait + scroll for lazy content
+6. Agent receives fully rendered content with title, text, and metadata
+
+## The Problem
+
+```
+# Standard HTTP fetch on Twitter/X:
+curl https://x.com/stellarorg
+→ Empty SPA shell. No tweets. No content.
+
+# RenderGate ($0.001 USDC on Stellar):
+→ "Stellar @StellarOrg · 9,913 posts · 840K Followers"
+→ "Meridian is headed to Lisbon. October 28–29."
+→ "10 days until Stellar House. Who's joining us in CDMX?"
+→ Full tweets, engagement metrics, retweets, quoted content
+```
+
+## Tested Sites
+
+All tested against the live deployed service at `tantk-rendergate.hf.space` with real Stellar testnet payments. Every request is a verifiable on-chain transaction.
+
+### Social Media
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| x.com (Twitter profiles) | 8-11s | Full tweets, bios, follower counts, engagement metrics, retweets |
+| linkedin.com (company pages) | 5.7s | Full profile, about, employees, locations |
+| tiktok.com (profiles) | 5.4s | Profile metadata, follower counts (video content needs login) |
+| instagram.com | 3.7s | Login wall only |
+
+### Crypto Exchanges
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| coinbase.com/price | 4.9s | Full price page, charts, market data (21K chars) |
+| okx.com/price | 6.6s | Full price page, live data |
+| kraken.com/prices | 7.5s | Full price page, history, about |
+| binance.com/price | — | Blocked (bot protection) |
+
+### Crypto Analytics & Data
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| coingecko.com | 8.9s | Full token page, price, market cap, charts (37K chars) |
+| coinmarketcap.com | 6.0s | Full token page, rankings, data |
+| defillama.com | 3.6s | TVL, fees, revenue, protocol rankings |
+| dexscreener.com | 5.7s | Live pair data — price, volume, liquidity, buy/sell ratio |
+| solscan.io | 4.4s | Solana explorer, analytics |
+| etherscan.io | — | Blocked (Cloudflare challenge) |
+| nansen.ai | 3.7s | Landing page content |
+| messari.io | — | Blocked (Vercel security checkpoint) |
+
+### Crypto News
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| cointelegraph.com | 4.2s | Headlines, prices, articles |
+| decrypt.co | 4.0s | Full news feed, coin prices (14K chars) |
+| blockworks.co | 7.4s | Analytics, prices, articles |
+| theblock.co | 5.2s | News content (behind cookie wall) |
+| medium.com (articles) | ~6s | Full articles (21K chars) — Cloudflare-blocked for normal fetch, works via RenderGate |
+
+### Stellar Ecosystem
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| stellar.expert | 4.5s | Block explorer, network stats |
+| stellarchain.io | 4.7s | Explorer, price, assets |
+| dashboard.stellar.org | 4.4s | Live network status, stats (6.5K chars) |
+| meridian.stellar.org | 7.2s | Conference details — Lisbon 2026 |
+| stellarterm.com | 5.3s | DEX trading interface |
+| stellarx.com | 5.4s | DEX, markets |
+| lobstr.co | 4.2s | Wallet landing, trade features |
+| soroswap.finance | 3.7s | Soroban DEX aggregator content |
+| freighter.app | 3.2s | Wallet download page |
+| scopuly.com | 6.3s | Full wallet/DEX interface |
+| lumenswap.io | 3.6s | DEX landing page |
+
+### DeFi Apps
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| app.uniswap.org | 7.3s | Live token prices, swap UI, TVL stats |
+| aave.com | 3.4s | Full landing, product info |
+| compound.finance | 3.1s | Market data, protocol stats |
+| blur.io | 3.5s | NFT marketplace, collections, floor prices |
+
+### On-Chain Analytics
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| tokenterminal.com | 5.1s | Stellar project page, metrics |
+| artemis.xyz | 5.1s | Full analytics platform (26K chars) |
+| flipsidecrypto.xyz | 3.9s | Data platform landing |
+
+### Developer Tools
+
+| Site | Render Time | Result |
+|------|-------------|--------|
+| npmjs.com | 4.6s | Full package pages + README (Cloudflare-protected, works) |
+| github.com (issues) | 6.3s | Full issue lists, content |
+| dorahacks.io | 6.5s | Full SPA content — hackathon details, resources |
+
+### Blocked Sites
+
+These sites block requests from data center IPs regardless of rendering — this is an IP reputation issue, not a rendering limitation.
+
+| Site | Reason |
+|------|--------|
+| reddit.com | IP banned from HF's data center |
+| producthunt.com | Cloudflare challenge |
+| binance.com | Bot protection |
+| etherscan.io | Cloudflare challenge |
+| messari.io | Vercel security checkpoint |
+| instagram.com | Requires login |
+
+| opensea.io | Cloudflare challenge |
+| dune.com | Cloudflare block |
+| alchemy.com | Blocked |
+
+Example transaction: [`5c898eb4...`](https://stellar.expert/explorer/testnet/tx/5c898eb489265c142baee086d502e25b87a5536e4386e5ccdf69edc2515c0ef6)
+
+## Using the Service
+
+### Option 1: MCP Tool (Claude Code, Codex, any MCP-compatible agent)
+
+Add to your MCP config (`.mcp.json` or Claude Code settings):
+
+```json
+{
+  "mcpServers": {
+    "rendergate": {
+      "command": "node",
+      "args": ["/path/to/rendergate/mcp-server.js"],
+      "env": {
+        "DEMO_PRIVATE_KEY": "S...your_testnet_secret_key...",
+        "RENDERGATE_URL": "https://tantk-rendergate.hf.space"
+      }
+    }
+  }
+}
+```
+
+Then the agent can simply call `render_page("https://x.com/stellarorg")` — payment happens transparently.
+
+### Option 2: x402 Fetch (any Node.js agent)
+
+```javascript
+import { wrapFetchWithPayment } from "@x402/fetch";
+
+const paidFetch = wrapFetchWithPayment(fetch, x402Client);
+const response = await paidFetch(
+  "https://tantk-rendergate.hf.space/render?url=https://x.com/stellarorg"
+);
+const data = await response.json();
+// { title, description, headings, links, content, renderTimeMs, payment }
+```
+
+The agent just needs:
+- `@x402/fetch` + `@x402/stellar` (npm packages)
+- A Stellar wallet with USDC
+- Our URL
+
+### Try It
+
+`demo-client.js` is included to test the service end-to-end:
+
+```bash
+npm install
+cp .env.example .env
+# Add your Stellar testnet secret key (DEMO_PRIVATE_KEY)
+SERVER_URL=https://tantk-rendergate.hf.space node demo-client.js "https://x.com/stellarorg"
+```
+
+You'll need a Stellar testnet wallet funded with USDC — generate one at [lab.stellar.org](https://lab.stellar.org/account/create), fund it, add a USDC trustline, and get testnet USDC from [faucet.circle.com](https://faucet.circle.com).
+
+## API
+
+### `GET /` (free)
+Returns service info and usage instructions.
+
+### `GET /health` (free)
+Health check.
+
+### `GET /render?url=<encoded_url>` (paid — $0.001 USDC)
+Renders the URL with a headless browser and returns structured output:
+```json
+{
+  "title": "Stellar (@StellarOrg) / X",
+  "description": "Meta description from the page",
+  "headings": [{ "level": "H1", "text": "Stellar's posts" }],
+  "links": [{ "text": "stellar.org", "href": "https://stellar.org" }],
+  "content": "Full rendered text content...",
+  "url": "https://x.com/stellarorg",
+  "renderedAt": "2026-04-13T06:59:12.395Z",
+  "renderTimeMs": 8071,
+  "payment": { "price": "$0.001", "network": "stellar:testnet" }
+}
+```
+
+If the page is blocked or empty, the payment is automatically refunded:
+```json
+{
+  "title": "Just a moment...",
+  "content": "Cloudflare security verification...",
+  "refund": {
+    "transaction": "bf68b792...",
+    "amount": "0.001 USDC",
+    "reason": "blocked_page"
+  }
+}
+```
+
+## Architecture
+
+```
+Agent                    RenderGate                  Stellar
+  |                          |                          |
+  |--- GET /render?url= --->|                          |
+  |<-- 402 Payment Required -|                          |
+  |                          |                          |
+  |--- Sign USDC payment ---|------------------------->|
+  |--- GET + payment header->|                          |
+  |                          |--- verify via x402.org ->|
+  |                          |<-- settlement confirmed -|
+  |                          |                          |
+  |                          |--- Playwright render --->| (browser)
+  |<-- 200 + rendered JSON --|                          |
+```
+
+## Tech Stack
+
+- **Payment:** x402 protocol on Stellar (USDC testnet)
+- **Facilitator:** x402.org (OpenZeppelin-based, sponsored fees)
+- **Rendering:** Playwright with Chromium (smart wait + scroll)
+- **Server:** Express.js
+- **Deployment:** Hugging Face Spaces (Docker)
+
+## Built For
+
+[Stellar Hacks: Agents](https://dorahacks.io/hackathon/stellar-agents-x402-stripe-mpp) hackathon — exploring x402 micropayments for the agentic economy on Stellar.

demo-client.js

@@ -0,0 +1,108 @@
+import "dotenv/config";
+import { Transaction, TransactionBuilder } from "@stellar/stellar-sdk";
+import { x402Client, x402HTTPClient } from "@x402/fetch";
+import { createEd25519Signer, getNetworkPassphrase } from "@x402/stellar";
+import { ExactStellarScheme } from "@x402/stellar/exact/client";
+
+const DEMO_PRIVATE_KEY = process.env.DEMO_PRIVATE_KEY;
+const SERVER_URL = process.env.SERVER_URL || "http://localhost:3001";
+const NETWORK = "stellar:testnet";
+const STELLAR_RPC_URL = "https://soroban-testnet.stellar.org";
+
+if (!DEMO_PRIVATE_KEY) {
+  console.error("ERROR: DEMO_PRIVATE_KEY not set in .env");
+  process.exit(1);
+}
+
+const targetUrl = process.argv[2] || "https://x.com/stellarorg";
+
+async function main() {
+  const renderEndpoint = `${SERVER_URL}/render?url=${encodeURIComponent(targetUrl)}`;
+
+  // Setup x402 client
+  const signer = createEd25519Signer(DEMO_PRIVATE_KEY, NETWORK);
+  const rpcConfig = { url: STELLAR_RPC_URL };
+  const client = new x402Client().register(
+    "stellar:*",
+    new ExactStellarScheme(signer, rpcConfig),
+  );
+  const httpClient = new x402HTTPClient(client);
+
+  console.log(`Target URL: ${targetUrl}`);
+  console.log(`Render endpoint: ${renderEndpoint}`);
+  console.log(`Paying from: ${signer.address}`);
+
+  // Step 1: Request without payment — expect 402
+  console.log("\n--- Step 1: Request without payment ---");
+  const firstTry = await fetch(renderEndpoint);
+  console.log(`Response: ${firstTry.status} ${firstTry.statusText}`);
+
+  if (firstTry.status !== 402) {
+    console.log("No payment required! Response:", await firstTry.text());
+    return;
+  }
+
+  // Step 2: Extract payment requirements from 402 response
+  console.log("\n--- Step 2: Create payment ---");
+  const paymentRequired = httpClient.getPaymentRequiredResponse((name) =>
+    firstTry.headers.get(name),
+  );
+  console.log("Payment required:", JSON.stringify(paymentRequired, null, 2));
+
+  // Step 3: Create and configure payment payload
+  let paymentPayload = await client.createPaymentPayload(paymentRequired);
+  const networkPassphrase = getNetworkPassphrase(NETWORK);
+  const tx = new Transaction(
+    paymentPayload.payload.transaction,
+    networkPassphrase,
+  );
+  const sorobanData = tx.toEnvelope().v1()?.tx()?.ext()?.sorobanData();
+  if (sorobanData) {
+    paymentPayload = {
+      ...paymentPayload,
+      payload: {
+        ...paymentPayload.payload,
+        transaction: TransactionBuilder.cloneFrom(tx, {
+          fee: "1",
+          sorobanData,
+          networkPassphrase,
+        })
+          .build()
+          .toXDR(),
+      },
+    };
+  }
+
+  // Step 4: Send paid request
+  console.log("\n--- Step 3: Send paid request ---");
+  const paymentHeaders =
+    httpClient.encodePaymentSignatureHeader(paymentPayload);
+  const start = Date.now();
+  const paidResponse = await fetch(renderEndpoint, {
+    method: "GET",
+    headers: paymentHeaders,
+  });
+  const elapsed = Date.now() - start;
+
+  // Step 5: Show results
+  console.log(`\n--- Result (${elapsed}ms) ---`);
+  console.log(`Status: ${paidResponse.status}`);
+
+  const paymentResponse = httpClient.getPaymentSettleResponse((name) =>
+    paidResponse.headers.get(name),
+  );
+  if (paymentResponse) {
+    console.log("Settlement:", JSON.stringify(paymentResponse, null, 2));
+  }
+
+  const data = await paidResponse.json();
+  console.log(`\nTitle: ${data.title}`);
+  console.log(`Render time: ${data.renderTimeMs}ms`);
+  console.log(`Content length: ${data.content?.length} chars`);
+  console.log(`\nContent preview:\n${data.content?.substring(0, 600)}`);
+}
+
+main().catch((err) => {
+  console.error("Client error:", err);
+  process.exit(1);
+});

mcp-server.js

@@ -0,0 +1,120 @@
+#!/usr/bin/env node
+import "dotenv/config";
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { z } from "zod";
+import { Transaction, TransactionBuilder } from "@stellar/stellar-sdk";
+import { x402Client, x402HTTPClient } from "@x402/fetch";
+import { createEd25519Signer, getNetworkPassphrase } from "@x402/stellar";
+import { ExactStellarScheme } from "@x402/stellar/exact/client";
+
+const DEMO_PRIVATE_KEY = process.env.DEMO_PRIVATE_KEY;
+const SERVER_URL = process.env.RENDERGATE_URL || "https://tantk-rendergate.hf.space";
+const NETWORK = "stellar:testnet";
+const STELLAR_RPC_URL = "https://soroban-testnet.stellar.org";
+
+// Setup x402 payment client
+let httpClient = null;
+let client = null;
+
+function getPaymentClient() {
+  if (!client && DEMO_PRIVATE_KEY) {
+    const signer = createEd25519Signer(DEMO_PRIVATE_KEY, NETWORK);
+    client = new x402Client().register(
+      "stellar:*",
+      new ExactStellarScheme(signer, { url: STELLAR_RPC_URL }),
+    );
+    httpClient = new x402HTTPClient(client);
+  }
+  return { client, httpClient };
+}
+
+async function paidRender(url) {
+  const { client, httpClient } = getPaymentClient();
+  if (!client) {
+    throw new Error("DEMO_PRIVATE_KEY not set — cannot make x402 payments");
+  }
+
+  const renderEndpoint = `${SERVER_URL}/render?url=${encodeURIComponent(url)}`;
+
+  // Step 1: Get 402 response
+  const firstTry = await fetch(renderEndpoint);
+  if (firstTry.status !== 402) {
+    return await firstTry.json();
+  }
+
+  // Step 2: Create payment
+  const paymentRequired = httpClient.getPaymentRequiredResponse((name) =>
+    firstTry.headers.get(name),
+  );
+
+  let paymentPayload = await client.createPaymentPayload(paymentRequired);
+  const networkPassphrase = getNetworkPassphrase(NETWORK);
+  const tx = new Transaction(
+    paymentPayload.payload.transaction,
+    networkPassphrase,
+  );
+  const sorobanData = tx.toEnvelope().v1()?.tx()?.ext()?.sorobanData();
+  if (sorobanData) {
+    paymentPayload = {
+      ...paymentPayload,
+      payload: {
+        ...paymentPayload.payload,
+        transaction: TransactionBuilder.cloneFrom(tx, {
+          fee: "1",
+          sorobanData,
+          networkPassphrase,
+        })
+          .build()
+          .toXDR(),
+      },
+    };
+  }
+
+  // Step 3: Send paid request
+  const headers = httpClient.encodePaymentSignatureHeader(paymentPayload);
+  const resp = await fetch(renderEndpoint, { method: "GET", headers });
+
+  if (!resp.ok) {
+    const text = await resp.text();
+    throw new Error(`Render failed (${resp.status}): ${text}`);
+  }
+
+  return await resp.json();
+}
+
+// Create MCP server
+const server = new McpServer({
+  name: "rendergate",
+  version: "1.0.0",
+});
+
+server.tool(
+  "render_page",
+  "Render a JavaScript-heavy webpage using a headless browser. Pays $0.001 USDC on Stellar per request via x402. Use this when standard HTTP fetch returns empty content from SPAs, Twitter/X, LinkedIn, DeFi apps, or Cloudflare-protected sites.",
+  {
+    url: z.string().url().describe("The URL to render (must be public http/https)"),
+  },
+  async ({ url }) => {
+    try {
+      const result = await paidRender(url);
+      return {
+        content: [
+          {
+            type: "text",
+            text: `# ${result.title}\n\nURL: ${result.url}\nRendered: ${result.renderedAt}\nRender time: ${result.renderTimeMs}ms\nPayment: ${result.payment?.price} on ${result.payment?.network}${result.refund ? `\nRefund: ${result.refund.amount} — ${result.refund.reason} (tx: ${result.refund.transaction})` : ""}\n\n${result.content}`,
+          },
+        ],
+      };
+    } catch (err) {
+      return {
+        content: [{ type: "text", text: `Error: ${err.message}` }],
+        isError: true,
+      };
+    }
+  },
+);
+
+// Start
+const transport = new StdioServerTransport();
+await server.connect(transport);

network-config.js

@@ -0,0 +1,32 @@
+// Network configuration. Reads NETWORK from env (default: stellar:testnet).
+// Set NETWORK=stellar:public for mainnet deployments.
+import { Networks } from "@stellar/stellar-sdk";
+
+const NETWORKS = {
+  "stellar:testnet": {
+    network: "stellar:testnet",
+    passphrase: Networks.TESTNET,
+    horizonUrl: "https://horizon-testnet.stellar.org",
+    usdcIssuer: "GBBD47IF6LWK7P7MDEVSCWR7DPUWV3NY3DTQEVFL4NAT4AQH3ZLLFLA5",
+  },
+  "stellar:public": {
+    network: "stellar:public",
+    passphrase: Networks.PUBLIC,
+    horizonUrl: "https://horizon.stellar.org",
+    usdcIssuer: "GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN",
+  },
+};
+
+const selected = process.env.NETWORK || "stellar:testnet";
+if (!NETWORKS[selected]) {
+  throw new Error(
+    `Invalid NETWORK="${selected}". Must be "stellar:testnet" or "stellar:public".`,
+  );
+}
+
+export const NETWORK = NETWORKS[selected].network;
+export const NETWORK_PASSPHRASE = NETWORKS[selected].passphrase;
+export const HORIZON_URL = NETWORKS[selected].horizonUrl;
+export const USDC_ISSUER = NETWORKS[selected].usdcIssuer;
+export const FACILITATOR_URL =
+  process.env.FACILITATOR_URL || "https://www.x402.org/facilitator";

package-lock.json

@@ -0,0 +1,2344 @@
+{
+  "name": "rendergate",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "rendergate",
+      "version": "1.0.0",
+      "license": "MIT",
+      "dependencies": {
+        "@modelcontextprotocol/sdk": "^1.29.0",
+        "@stellar/stellar-sdk": "^15.0.1",
+        "@x402/core": "^2.9.0",
+        "@x402/express": "^2.9.0",
+        "@x402/fetch": "^2.9.0",
+        "@x402/stellar": "^2.9.0",
+        "dotenv": "^17.4.2",
+        "express": "^5.2.1",
+        "playwright": "^1.59.1"
+      },
+      "devDependencies": {
+        "@trionlabs/stellar8004": "^0.0.11"
+      }
+    },
+    "node_modules/@adraffy/ens-normalize": {
+      "version": "1.10.1",
+      "resolved": "https://registry.npmmirror.com/@adraffy/ens-normalize/-/ens-normalize-1.10.1.tgz",
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+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmmirror.com/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/which-typed-array": {
+      "version": "1.1.20",
+      "resolved": "https://registry.npmmirror.com/which-typed-array/-/which-typed-array-1.1.20.tgz",
+      "integrity": "sha512-LYfpUkmqwl0h9A2HL09Mms427Q1RZWuOHsukfVcKRq9q95iQxdw0ix1JQrqbcDR9PH1QDwf5Qo8OZb5lksZ8Xg==",
+      "license": "MIT",
+      "dependencies": {
+        "available-typed-arrays": "^1.0.7",
+        "call-bind": "^1.0.8",
+        "call-bound": "^1.0.4",
+        "for-each": "^0.3.5",
+        "get-proto": "^1.0.1",
+        "gopd": "^1.2.0",
+        "has-tostringtag": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmmirror.com/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    },
+    "node_modules/ws": {
+      "version": "8.17.1",
+      "resolved": "https://registry.npmmirror.com/ws/-/ws-8.17.1.tgz",
+      "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/zod": {
+      "version": "3.25.76",
+      "resolved": "https://registry.npmmirror.com/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    },
+    "node_modules/zod-to-json-schema": {
+      "version": "3.25.2",
+      "resolved": "https://registry.npmmirror.com/zod-to-json-schema/-/zod-to-json-schema-3.25.2.tgz",
+      "integrity": "sha512-O/PgfnpT1xKSDeQYSCfRI5Gy3hPf91mKVDuYLUHZJMiDFptvP41MSnWofm8dnCm0256ZNfZIM7DSzuSMAFnjHA==",
+      "license": "ISC",
+      "peerDependencies": {
+        "zod": "^3.25.28 || ^4"
+      }
+    }
+  }
+}

package.json

@@ -0,0 +1,34 @@
+{
+  "name": "rendergate",
+  "version": "1.0.0",
+  "description": "Pay-per-render headless browser API powered by x402 micropayments on Stellar",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "demo": "node demo-client.js"
+  },
+  "keywords": [
+    "x402",
+    "stellar",
+    "render",
+    "headless-browser",
+    "micropayments"
+  ],
+  "author": "tantk",
+  "license": "MIT",
+  "type": "module",
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.29.0",
+    "@stellar/stellar-sdk": "^15.0.1",
+    "@x402/core": "^2.9.0",
+    "@x402/express": "^2.9.0",
+    "@x402/fetch": "^2.9.0",
+    "@x402/stellar": "^2.9.0",
+    "dotenv": "^17.4.2",
+    "express": "^5.2.1",
+    "playwright": "^1.59.1"
+  },
+  "devDependencies": {
+    "@trionlabs/stellar8004": "^0.0.11"
+  }
+}

refund.js

@@ -0,0 +1,127 @@
+import {
+  Keypair,
+  TransactionBuilder,
+  Operation,
+  Asset,
+  Horizon,
+  Memo,
+} from "@stellar/stellar-sdk";
+import { NETWORK_PASSPHRASE, HORIZON_URL, USDC_ISSUER } from "./network-config.js";
+
+const USDC = new Asset("USDC", USDC_ISSUER);
+
+// Per-payer refund rate limit. Throws off attrition attacks (paying $0.001
+// repeatedly to drain XLM via tx fees) without blocking legitimate users.
+// In-memory only — fine for single-instance HF Space; revisit if we scale.
+const REFUND_WINDOW_MS = 60 * 60 * 1000; // 1 hour
+const REFUND_MAX_PER_WINDOW = 10;
+const refundLog = new Map(); // payerAddress -> [timestamp, ...]
+
+function isRefundRateLimited(payerAddress) {
+  const now = Date.now();
+  const cutoff = now - REFUND_WINDOW_MS;
+  const history = (refundLog.get(payerAddress) || []).filter((t) => t > cutoff);
+  if (history.length >= REFUND_MAX_PER_WINDOW) {
+    refundLog.set(payerAddress, history);
+    return true;
+  }
+  history.push(now);
+  refundLog.set(payerAddress, history);
+  return false;
+}
+
+// Periodic prune so the map doesn't grow unbounded.
+setInterval(() => {
+  const cutoff = Date.now() - REFUND_WINDOW_MS;
+  for (const [addr, history] of refundLog) {
+    const kept = history.filter((t) => t > cutoff);
+    if (kept.length === 0) refundLog.delete(addr);
+    else refundLog.set(addr, kept);
+  }
+}, REFUND_WINDOW_MS).unref();
+
+const BLOCKED_PATTERNS = [
+  "you've been blocked",
+  "you have been blocked",
+  "blocked by network security",
+  "access denied",
+  "please log in",
+  "log in to",
+  "sign in to",
+  "enable javascript",
+  "just a moment...",
+  "checking your browser",
+  "performing security verification",
+  "ray id:",
+  "cloudflare",
+  "attention required",
+  "please verify you are a human",
+  "this page doesn't exist",
+];
+
+export function isFailedRender(content, title) {
+  if (!content || content.length < 100) return "empty_content";
+
+  const lower = content.toLowerCase();
+  const titleLower = (title || "").toLowerCase();
+
+  // Check title for block signals
+  if (titleLower === "just a moment..." || titleLower === "blocked") {
+    return "blocked_page";
+  }
+
+  // Check content for block/login patterns
+  for (const pattern of BLOCKED_PATTERNS) {
+    // Only flag if the blocked pattern is a large portion of the content
+    // (avoid false positives on pages that mention "log in" in a nav bar)
+    if (lower.includes(pattern) && content.length < 500) {
+      return "blocked_page";
+    }
+  }
+
+  return null; // render is good
+}
+
+export async function sendRefund(payerAddress, amount, memo) {
+  const serverSecret = process.env.SERVER_SECRET;
+  if (!serverSecret) {
+    console.error("SERVER_SECRET not set — cannot send refund");
+    return null;
+  }
+
+  if (isRefundRateLimited(payerAddress)) {
+    console.warn(
+      `Refund rate-limited for ${payerAddress} (>${REFUND_MAX_PER_WINDOW}/hr) — skipping`,
+    );
+    return null;
+  }
+
+  try {
+    const server = new Horizon.Server(HORIZON_URL);
+    const keypair = Keypair.fromSecret(serverSecret);
+    const account = await server.loadAccount(keypair.publicKey());
+
+    const tx = new TransactionBuilder(account, {
+      fee: "100",
+      networkPassphrase: NETWORK_PASSPHRASE,
+    })
+      .addOperation(
+        Operation.payment({
+          destination: payerAddress,
+          asset: USDC,
+          amount: amount,
+        }),
+      )
+      .addMemo(new Memo("text", (memo || "RenderGate refund").slice(0, 28)))
+      .setTimeout(30)
+      .build();
+
+    tx.sign(keypair);
+    const result = await server.submitTransaction(tx);
+    console.log(`Refund sent to ${payerAddress}: ${result.hash}`);
+    return result.hash;
+  } catch (err) {
+    console.error(`Refund failed for ${payerAddress}:`, err.message);
+    return null;
+  }
+}

renderer.js

@@ -0,0 +1,139 @@
+import { chromium } from "playwright";
+import { isAllowedUrl } from "./url-policy.js";
+
+const MAX_CONCURRENT = 3;
+const MAX_CONTENT_LENGTH = 100_000;
+let browserPromise = null;
+let activeRenders = 0;
+
+async function getBrowser() {
+  if (!browserPromise) {
+    browserPromise = chromium.launch({ headless: true }).catch((err) => {
+      browserPromise = null;
+      throw err;
+    });
+  }
+  return browserPromise;
+}
+
+export async function renderUrl(url, { timeout = 30000, scroll = true } = {}) {
+  if (activeRenders >= MAX_CONCURRENT) {
+    throw new Error("Too many concurrent renders, try again later");
+  }
+  activeRenders++;
+
+  let page;
+  try {
+    const b = await getBrowser();
+    page = await b.newPage();
+  } catch (err) {
+    activeRenders--;
+    browserPromise = null; // Reset on browser failure
+    throw new Error(`Browser launch failed: ${err.message}`);
+  }
+
+  try {
+    await page.setExtraHTTPHeaders({
+      "User-Agent":
+        "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+    });
+
+    // Block requests to private/loopback addresses (catches redirects that
+    // would bypass the entry-point URL check). Each subresource — main
+    // navigation, iframes, fetch/XHR, images — runs through isAllowedUrl.
+    await page.route("**", (route) => {
+      const reqUrl = route.request().url();
+      // Allow data:, blob:, about: — non-network schemes
+      if (!/^https?:/i.test(reqUrl)) {
+        return route.continue();
+      }
+      if (!isAllowedUrl(reqUrl)) {
+        return route.abort("blockedbyclient");
+      }
+      return route.continue();
+    });
+
+    await page.goto(url, { waitUntil: "domcontentloaded", timeout });
+
+    // Smart wait: poll until content stabilizes
+    let prevLen = 0;
+    let stableCount = 0;
+    for (let i = 0; i < 20; i++) {
+      await page.waitForTimeout(250);
+      const curLen = await page.evaluate(() => document.body.innerText.length);
+      if (curLen === prevLen && curLen > 100) {
+        stableCount++;
+        if (stableCount >= 2) break;
+      } else {
+        stableCount = 0;
+      }
+      prevLen = curLen;
+    }
+
+    // Scroll to trigger lazy-loaded content
+    if (scroll) {
+      for (let i = 0; i < 3; i++) {
+        await page.evaluate(() => window.scrollBy(0, 1000));
+        await page.waitForTimeout(500);
+      }
+      await page.waitForTimeout(500);
+    }
+
+    const extracted = await page.evaluate(() => {
+      const remove = document.querySelectorAll(
+        'script, style, nav[aria-label="Footer"], [role="complementary"]',
+      );
+      remove.forEach((el) => el.remove());
+
+      const title = document.title;
+      const description =
+        document.querySelector('meta[name="description"]')?.content ||
+        document.querySelector('meta[property="og:description"]')?.content ||
+        "";
+      const headings = Array.from(
+        document.querySelectorAll("h1, h2, h3"),
+        (el) => ({ level: el.tagName, text: el.innerText.trim() }),
+      ).filter((h) => h.text.length > 0);
+      const links = Array.from(
+        document.querySelectorAll("a[href]"),
+        (el) => ({ text: el.innerText.trim(), href: el.href }),
+      )
+        .filter((l) => l.text.length > 0 && l.href.startsWith("http"))
+        .slice(0, 50);
+      const content = document.body.innerText;
+
+      return { title, description, headings, links, content };
+    });
+
+    if (extracted.content.length > MAX_CONTENT_LENGTH) {
+      extracted.content = extracted.content.slice(0, MAX_CONTENT_LENGTH);
+    }
+
+    return {
+      title: extracted.title,
+      description: extracted.description,
+      headings: extracted.headings,
+      links: extracted.links,
+      content: extracted.content,
+      url,
+      renderedAt: new Date().toISOString(),
+    };
+  } catch (err) {
+    // If page interaction fails, browser may be dead
+    if (err.message?.includes("Target closed") || err.message?.includes("Browser closed")) {
+      browserPromise = null;
+    }
+    throw err;
+  } finally {
+    activeRenders--;
+    await page.close().catch(() => {});
+  }
+}
+
+export async function closeBrowser() {
+  if (browserPromise) {
+    const b = await browserPromise.catch(() => null);
+    if (b) await b.close().catch(() => {});
+    browserPromise = null;
+  }
+}

save-demo.js

@@ -0,0 +1,102 @@
+import "dotenv/config";
+import { writeFileSync } from "fs";
+import { Transaction, TransactionBuilder } from "@stellar/stellar-sdk";
+import { x402Client, x402HTTPClient } from "@x402/fetch";
+import { createEd25519Signer, getNetworkPassphrase } from "@x402/stellar";
+import { ExactStellarScheme } from "@x402/stellar/exact/client";
+
+const SERVER_URL = process.env.SERVER_URL || "https://tantk-rendergate.hf.space";
+const NETWORK = "stellar:testnet";
+
+const signer = createEd25519Signer(process.env.DEMO_PRIVATE_KEY, NETWORK);
+const client = new x402Client().register(
+  "stellar:*",
+  new ExactStellarScheme(signer, { url: "https://soroban-testnet.stellar.org" }),
+);
+const httpClient = new x402HTTPClient(client);
+
+async function paidRender(targetUrl) {
+  const endpoint = `${SERVER_URL}/render?url=${encodeURIComponent(targetUrl)}`;
+  const r1 = await fetch(endpoint);
+  if (r1.status !== 402) return await r1.json();
+
+  const pr = httpClient.getPaymentRequiredResponse((n) => r1.headers.get(n));
+  let pp = await client.createPaymentPayload(pr);
+  const np = getNetworkPassphrase(NETWORK);
+  const tx = new Transaction(pp.payload.transaction, np);
+  const sd = tx.toEnvelope().v1()?.tx()?.ext()?.sorobanData();
+  if (sd) {
+    pp = {
+      ...pp,
+      payload: {
+        ...pp.payload,
+        transaction: TransactionBuilder.cloneFrom(tx, {
+          fee: "1", sorobanData: sd, networkPassphrase: np,
+        }).build().toXDR(),
+      },
+    };
+  }
+  const headers = httpClient.encodePaymentSignatureHeader(pp);
+  const r2 = await fetch(endpoint, { headers });
+  return await r2.json();
+}
+
+function formatOutput(data, targetUrl) {
+  let out = `=== RenderGate: ${targetUrl} ===\n`;
+  out += `Payment: ${data.payment?.price} USDC on ${data.payment?.network}\n`;
+  out += `Render time: ${data.renderTimeMs}ms\n\n`;
+
+  out += `Title: ${data.title}\n`;
+  if (data.description) out += `Description: ${data.description}\n`;
+  out += `\n`;
+
+  if (data.headings?.length > 0) {
+    out += `Headings (${data.headings.length}):\n`;
+    data.headings.slice(0, 15).forEach((h) => {
+      out += `  ${h.level}: ${h.text}\n`;
+    });
+    out += `\n`;
+  }
+
+  if (data.links?.length > 0) {
+    out += `Links (${data.links.length}):\n`;
+    data.links.slice(0, 15).forEach((l) => {
+      out += `  ${l.text.substring(0, 50)} → ${l.href}\n`;
+    });
+    out += `\n`;
+  }
+
+  if (data.refund) {
+    out += `*** AUTO-REFUND ***\n`;
+    out += `Reason: ${data.refund.reason}\n`;
+    out += `Refund amount: ${data.refund.amount}\n`;
+    out += `Refund transaction: ${data.refund.transaction}\n`;
+    out += `Verify: https://stellar.expert/explorer/testnet/tx/${data.refund.transaction}\n\n`;
+  }
+
+  out += `Content (${data.content?.length} chars):\n`;
+  out += data.content || "(empty)";
+  return out;
+}
+
+const sites = [
+  { name: "1-twitter", url: "https://x.com/stellarorg" },
+  { name: "2-linkedin", url: "https://www.linkedin.com/company/stellar-development-foundation" },
+  { name: "3-soroswap", url: "https://soroswap.finance" },
+  { name: "4-producthunt", url: "https://www.producthunt.com" },
+];
+
+for (const site of sites) {
+  console.log(`Rendering ${site.name}...`);
+  try {
+    const data = await paidRender(site.url);
+    const output = formatOutput(data, site.url);
+    const path = `demo-output/${site.name}-with.txt`;
+    writeFileSync(path, output);
+    console.log(`  Saved: ${path} (${data.content?.length} chars, refund: ${!!data.refund})`);
+  } catch (err) {
+    console.error(`  Failed: ${err.message}`);
+  }
+}
+
+console.log("Done!");

scripts/register-8004.js

@@ -0,0 +1,92 @@
+// One-time script: register RenderGate as an 8004 agent on Stellar testnet.
+// Re-run safely — if metadata changes, use updateAgentUri() instead (see bottom).
+//
+// Usage: node scripts/register-8004.js
+// Requires: AGENT_OWNER_SECRET_TESTNET in .env
+
+import "dotenv/config";
+import { Keypair } from "@stellar/stellar-sdk";
+import {
+  createClients,
+  TESTNET_CONFIG,
+  wrapBasicSigner,
+  buildMetadataJson,
+  toDataUri,
+  validateMetadataJson,
+  ExplorerClient,
+} from "@trionlabs/stellar8004";
+
+const SECRET = process.env.AGENT_OWNER_SECRET_TESTNET;
+if (!SECRET) {
+  console.error("ERROR: AGENT_OWNER_SECRET_TESTNET not set in .env");
+  process.exit(1);
+}
+
+// 1. Build metadata
+const metadata = buildMetadataJson({
+  name: "RenderGate",
+  description:
+    "Pay-per-render headless browser API for AI agents. Renders JS-heavy pages (Twitter, LinkedIn, SPAs) and returns structured content. Auto-refunds when pages are blocked.",
+  imageUrl: "https://tantk.github.io/rendergate-githubpage/logo.png",
+  services: [
+    {
+      name: "x402",
+      endpoint: "https://tantk-rendergate.hf.space/render",
+      version: "1.0",
+      description:
+        "Render a JS-heavy webpage and return title, description, headings, links, and full text content. $0.001 USDC per render.",
+      inputExample: '{"url": "https://x.com/stellarorg"}',
+    },
+    {
+      name: "mcp",
+      endpoint: "https://tantk-rendergate.hf.space/render",
+    },
+  ],
+  supportedTrust: ["reputation"],
+  x402Enabled: true,
+});
+
+console.log("Metadata to register:");
+console.log(JSON.stringify(metadata, null, 2));
+console.log();
+
+validateMetadataJson(metadata);
+const dataUri = toDataUri(metadata);
+console.log(`Data URI size: ${dataUri.length} bytes (limit 8KB)\n`);
+
+// 2. Set up signer + clients
+const keypair = Keypair.fromSecret(SECRET);
+const signer = wrapBasicSigner(keypair, TESTNET_CONFIG.networkPassphrase);
+const { identity } = createClients(TESTNET_CONFIG, signer);
+
+console.log(`Owner address: ${keypair.publicKey()}`);
+console.log("Submitting register_with_uri to testnet Identity Registry...\n");
+
+// 3. Register on-chain
+const tx = await identity.register_with_uri({
+  caller: keypair.publicKey(),
+  agent_uri: dataUri,
+});
+const sent = await tx.signAndSend();
+const agentId = sent.result;
+
+console.log(`✓ Registered! Agent ID: ${agentId}`);
+console.log(`  Tx hash: ${sent.getTransactionResponse?.hash || "(see logs)"}`);
+console.log();
+console.log("Save this ID — it's your agent's permanent identifier:");
+console.log(`  AGENT_ID=${agentId}`);
+console.log();
+console.log(
+  `Explorer page (allow ~30-60s for indexing): https://stellar8004.com/agents/${agentId}`,
+);
+
+// 4. Optional: verify via explorer once indexed
+const explorer = new ExplorerClient();
+console.log("\nWaiting 5s, then querying explorer...");
+await new Promise((r) => setTimeout(r, 5000));
+try {
+  const agent = await explorer.getAgent(agentId);
+  console.log("Explorer record:", agent ? "found" : "not yet indexed");
+} catch (err) {
+  console.log("Explorer query:", err.message);
+}

scripts/setup-agent-keypair.js

@@ -0,0 +1,28 @@
+// One-time: generate a fresh Stellar testnet keypair, fund it via friendbot,
+// and print the keys so you can save them to .env.
+
+import { Keypair } from "@stellar/stellar-sdk";
+
+const kp = Keypair.random();
+const pub = kp.publicKey();
+const sec = kp.secret();
+
+console.log("Generated new testnet keypair:");
+console.log(`  Public:  ${pub}`);
+console.log(`  Secret:  ${sec}`);
+console.log();
+
+console.log("Funding via friendbot...");
+const res = await fetch(`https://friendbot.stellar.org?addr=${pub}`);
+if (!res.ok) {
+  console.error(`Friendbot failed: ${res.status}`);
+  console.error(await res.text());
+  process.exit(1);
+}
+console.log("✓ Funded with 10,000 testnet XLM");
+console.log();
+
+console.log("Add to .env:");
+console.log(`  AGENT_OWNER_SECRET_TESTNET=${sec}`);
+console.log();
+console.log(`Verify: https://stellar.expert/explorer/testnet/account/${pub}`);

scripts/verify-8004.js

@@ -0,0 +1,42 @@
+// Query the testnet Identity Registry to confirm our agent ID and owner.
+import {
+  TESTNET_CONFIG,
+  createClients,
+  wrapBasicSigner,
+} from "@trionlabs/stellar8004";
+import { Keypair } from "@stellar/stellar-sdk";
+
+const SECRET = process.env.AGENT_OWNER_SECRET_TESTNET;
+if (!SECRET) {
+  console.error("Set AGENT_OWNER_SECRET_TESTNET");
+  process.exit(1);
+}
+
+const kp = Keypair.fromSecret(SECRET);
+const signer = wrapBasicSigner(kp, TESTNET_CONFIG.networkPassphrase);
+const { identity } = createClients(TESTNET_CONFIG, signer);
+
+console.log(`My address: ${kp.publicKey()}`);
+
+// Total agents
+const totalTx = await identity.total_agents();
+console.log(`total_agents(): ${totalTx.result}`);
+
+// Walk back from total_agents()-1 to find ones we own
+const total = Number(totalTx.result);
+console.log(`\nScanning agents [0..${total - 1}] for ownership...`);
+
+for (let id = Math.max(0, total - 5); id < total; id++) {
+  try {
+    const ownerTx = await identity.find_owner({ agent_id: id });
+    const uriTx = await identity.agent_uri({ agent_id: id });
+    const owner = ownerTx.result;
+    const uri = uriTx.result;
+    const mine = owner === kp.publicKey() ? "  ← OWNED BY ME" : "";
+    console.log(
+      `  agent ${id}: owner=${owner?.slice(0, 8) || "?"}... uri=${(uri || "").slice(0, 60)}...${mine}`,
+    );
+  } catch (err) {
+    console.log(`  agent ${id}: ${err.message}`);
+  }
+}

server.js

@@ -0,0 +1,167 @@
+import "dotenv/config";
+import express from "express";
+import { paymentMiddlewareFromConfig } from "@x402/express";
+import { HTTPFacilitatorClient } from "@x402/core/server";
+import { ExactStellarScheme } from "@x402/stellar/exact/server";
+import { Transaction, Address } from "@stellar/stellar-sdk";
+import { renderUrl, closeBrowser } from "./renderer.js";
+import { isFailedRender, sendRefund } from "./refund.js";
+import { NETWORK, NETWORK_PASSPHRASE, FACILITATOR_URL } from "./network-config.js";
+import { isAllowedUrl } from "./url-policy.js";
+
+const PORT = process.env.PORT || 3001;
+const PRICE = "$0.001";
+const REFUND_AMOUNT = "0.001";
+const PAY_TO = process.env.PAY_TO;
+
+if (!PAY_TO) {
+  console.error("ERROR: PAY_TO not set in .env");
+  process.exit(1);
+}
+
+// Extract payer from the payment-signature request header.
+// x402 payments are exactly one InvokeHostFunction op calling USDC.transfer
+// with one auth entry whose address is the payer. Reject anything that doesn't
+// match this exact shape — we don't want to refund ambiguous transactions.
+function getPayerAddress(req) {
+  try {
+    const header = req.get("payment-signature") || req.get("x-payment");
+    if (!header) return null;
+    const decoded = JSON.parse(Buffer.from(header, "base64").toString());
+    const txXdr = decoded?.payload?.transaction;
+    if (!txXdr) return null;
+    const tx = new Transaction(txXdr, NETWORK_PASSPHRASE);
+    if (tx.operations.length !== 1) return null;
+    const op = tx.operations[0];
+    if (op.type !== "invokeHostFunction") return null;
+    if (!op.auth || op.auth.length !== 1) return null;
+    const creds = op.auth[0].credentials();
+    if (creds.switch().name !== "sorobanCredentialsAddress") return null;
+    return Address.fromScAddress(creds.address().address()).toString();
+  } catch {
+    return null;
+  }
+}
+
+const app = express();
+
+// Info endpoint (free)
+app.get("/", (_, res) =>
+  res.json({
+    service: "RenderGate",
+    description: "Pay-per-render headless browser API on Stellar x402",
+    price: PRICE,
+    network: NETWORK,
+    usage: "GET /render?url=<encoded_url>",
+  }),
+);
+
+// Health check (free)
+app.get("/health", (_, res) => res.json({ status: "ok" }));
+
+// URL validation — runs before payment to reject SSRF attempts early
+app.use("/render", (req, res, next) => {
+  const url = req.query.url;
+  if (!url) return res.status(400).json({ error: "Missing ?url= parameter" });
+  let decoded;
+  try {
+    decoded = decodeURIComponent(url);
+  } catch {
+    return res.status(400).json({ error: "Malformed URL encoding" });
+  }
+  if (!isAllowedUrl(decoded)) {
+    return res
+      .status(400)
+      .json({ error: "URL not allowed — only public http/https URLs" });
+  }
+  req.decodedUrl = decoded;
+  next();
+});
+
+// x402 payment middleware — protects /render
+app.use(
+  paymentMiddlewareFromConfig(
+    {
+      "GET /render": {
+        accepts: {
+          scheme: "exact",
+          price: PRICE,
+          network: NETWORK,
+          payTo: PAY_TO,
+          maxTimeoutSeconds: 60,
+        },
+        description: "Render a JS-heavy webpage and return extracted content",
+      },
+    },
+    new HTTPFacilitatorClient({ url: FACILITATOR_URL }),
+    [{ network: NETWORK, server: new ExactStellarScheme() }],
+  ),
+);
+
+// Protected render endpoint
+app.get("/render", async (req, res) => {
+  const decoded = req.decodedUrl;
+
+  try {
+    console.log(`Rendering: ${decoded}`);
+    const start = Date.now();
+    const result = await renderUrl(decoded);
+    const elapsed = Date.now() - start;
+
+    const failReason = isFailedRender(result.content, result.title);
+    if (failReason) {
+      const payerAddress = getPayerAddress(req);
+      let refund = null;
+      if (payerAddress) {
+        console.log(`Bad render (${failReason}) for ${decoded} — refunding ${payerAddress}`);
+        const refundHash = await sendRefund(payerAddress, REFUND_AMOUNT, `refund:${failReason}`);
+        refund = refundHash
+          ? { transaction: refundHash, amount: `${REFUND_AMOUNT} USDC`, reason: failReason }
+          : { error: "Refund failed — contact support", reason: failReason };
+      }
+
+      return res.json({
+        ...result,
+        renderTimeMs: elapsed,
+        payment: { price: PRICE, network: NETWORK },
+        refund,
+      });
+    }
+
+    res.json({
+      ...result,
+      renderTimeMs: elapsed,
+      payment: { price: PRICE, network: NETWORK },
+    });
+  } catch (err) {
+    console.error(`Render failed for ${decoded}:`, err.message);
+    if (err.message.includes("Too many concurrent")) {
+      return res.status(503).json({ error: err.message });
+    }
+    // Attempt refund on crash
+    const payerAddress = getPayerAddress(req);
+    let refund = null;
+    if (payerAddress) {
+      const refundHash = await sendRefund(payerAddress, REFUND_AMOUNT, "refund:render_crash");
+      refund = refundHash
+        ? { transaction: refundHash, amount: `${REFUND_AMOUNT} USDC`, reason: "render_crash" }
+        : { error: "Refund failed — contact support" };
+    }
+    res.status(500).json({ error: "Render failed", message: err.message, refund });
+  }
+});
+
+const server = app.listen(Number(PORT), () => {
+  console.log(`RenderGate listening on http://localhost:${PORT}`);
+  console.log(`  Pay ${PRICE} USDC on ${NETWORK} per render`);
+  console.log(`  Payments go to ${PAY_TO}`);
+});
+
+for (const sig of ["SIGTERM", "SIGINT"]) {
+  process.on(sig, async () => {
+    console.log(`${sig} received, shutting down...`);
+    server.close();
+    await closeBrowser();
+    process.exit(0);
+  });
+}

url-policy.js

@@ -0,0 +1,39 @@
+// Shared URL policy. Used both at request entry (server.js) and per-request
+// inside the renderer (renderer.js) so redirects to private IPs are blocked.
+
+const PRIVATE_HOSTNAMES = new Set([
+  "localhost",
+  "127.0.0.1",
+  "0.0.0.0",
+  "[::1]",
+  "::1",
+]);
+
+/**
+ * Returns true if `urlStr` is a public http(s) URL we're willing to fetch.
+ * Rejects: non-http(s) schemes, localhost, IPv6 literals, RFC1918 IPv4,
+ * link-local, and anything that fails to parse.
+ */
+export function isAllowedUrl(urlStr) {
+  let parsed;
+  try {
+    parsed = new URL(urlStr);
+  } catch {
+    return false;
+  }
+  if (!["http:", "https:"].includes(parsed.protocol)) return false;
+
+  const host = parsed.hostname;
+  if (PRIVATE_HOSTNAMES.has(host)) return false;
+  if (host.startsWith("[")) return false; // any IPv6 literal — overly cautious by design
+  if (host === "::1") return false;
+
+  // RFC1918 + link-local IPv4 ranges
+  const parts = host.split(".");
+  if (parts[0] === "10") return false;
+  if (parts[0] === "172" && +parts[1] >= 16 && +parts[1] <= 31) return false;
+  if (parts[0] === "192" && parts[1] === "168") return false;
+  if (parts[0] === "169" && parts[1] === "254") return false;
+
+  return true;
+}