RenderGate: x402-powered headless rendering API on Stellar

.env.example

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+# Stellar testnet secret key (starts with S...)
+STELLAR_PRIVATE_KEY=
+# Stellar testnet public key to receive payments (starts with G...)
+PAY_TO=

.gitattributes

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+*.7z filter=lfs diff=lfs merge=lfs -text
+*.arrow filter=lfs diff=lfs merge=lfs -text
+*.bin filter=lfs diff=lfs merge=lfs -text
+*.bz2 filter=lfs diff=lfs merge=lfs -text
+*.ckpt filter=lfs diff=lfs merge=lfs -text
+*.ftz filter=lfs diff=lfs merge=lfs -text
+*.gz filter=lfs diff=lfs merge=lfs -text
+*.h5 filter=lfs diff=lfs merge=lfs -text
+*.joblib filter=lfs diff=lfs merge=lfs -text
+*.lfs.* filter=lfs diff=lfs merge=lfs -text
+*.mlmodel filter=lfs diff=lfs merge=lfs -text
+*.model filter=lfs diff=lfs merge=lfs -text
+*.msgpack filter=lfs diff=lfs merge=lfs -text
+*.npy filter=lfs diff=lfs merge=lfs -text
+*.npz filter=lfs diff=lfs merge=lfs -text
+*.onnx filter=lfs diff=lfs merge=lfs -text
+*.ot filter=lfs diff=lfs merge=lfs -text
+*.parquet filter=lfs diff=lfs merge=lfs -text
+*.pb filter=lfs diff=lfs merge=lfs -text
+*.pickle filter=lfs diff=lfs merge=lfs -text
+*.pkl filter=lfs diff=lfs merge=lfs -text
+*.pt filter=lfs diff=lfs merge=lfs -text
+*.pth filter=lfs diff=lfs merge=lfs -text
+*.rar filter=lfs diff=lfs merge=lfs -text
+*.safetensors filter=lfs diff=lfs merge=lfs -text
+saved_model/**/* filter=lfs diff=lfs merge=lfs -text
+*.tar.* filter=lfs diff=lfs merge=lfs -text
+*.tar filter=lfs diff=lfs merge=lfs -text
+*.tflite filter=lfs diff=lfs merge=lfs -text
+*.tgz filter=lfs diff=lfs merge=lfs -text
+*.wasm filter=lfs diff=lfs merge=lfs -text
+*.xz filter=lfs diff=lfs merge=lfs -text
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.zst filter=lfs diff=lfs merge=lfs -text
+*tfevents* filter=lfs diff=lfs merge=lfs -text

.gitignore

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+node_modules/
+.env
+test_*.py
+bench_*.py
+__pycache__/
+docs/superpowers/

Dockerfile

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+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
+RUN npx playwright install chromium
+
+COPY server.js renderer.js ./
+
+USER node
+ENV PORT=7860
+
+EXPOSE 7860
+
+CMD ["node", "server.js"]

README.md

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+---
+title: RenderGate
+emoji: 🔍
+colorFrom: blue
+colorTo: purple
+sdk: docker
+app_port: 7860
+---
+
+# RenderGate
+
+**Pay-per-render headless browser API, powered by x402 micropayments on Stellar.**
+
+AI agents struggle with JavaScript-rendered websites — SPAs, Twitter/X, DeFi apps, and Cloudflare-protected sites all return empty HTML shells to standard HTTP fetch. RenderGate solves this with a headless browser rendering service that agents pay for per-request via x402 micropayments in USDC on Stellar.
+
+**Live service:** https://tantk-rendergate.hf.space
+
+## 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 |
+| stellar.expert | 4.5s | Block explorer, network stats |
+| stellarchain.io | 4.7s | Explorer, price, assets |
+| 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) |
+
+### 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 |
+| medium.com | Server error (500) |
+| opensea.io | Cloudflare challenge |
+| dune.com | Cloudflare block |
+| alchemy.com | Blocked |
+
+Example transaction: [`5c898eb4...`](https://stellar.expert/explorer/testnet/tx/5c898eb489265c142baee086d502e25b87a5536e4386e5ccdf69edc2515c0ef6)
+
+## Using the Service
+
+Any x402-compatible agent can use RenderGate with just the URL. No API keys, no accounts, no setup.
+
+```javascript
+import { wrapFetchWithPayment } from "@x402/fetch";
+
+// One line — the library handles 402 → pay → retry automatically
+const response = await paidFetch(
+  "https://tantk-rendergate.hf.space/render?url=https://x.com/stellarorg"
+);
+const data = await response.json();
+// { title: "Stellar (@StellarOrg) / X", content: "9,913 posts...", ... }
+```
+
+That's it. 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. It walks through the x402 payment flow step by step.
+
+```bash
+npm install
+cp .env.example .env
+# Add your Stellar testnet secret key (STELLAR_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:
+```json
+{
+  "title": "Stellar (@StellarOrg) / X",
+  "content": "9,913 posts... 840.1K Followers... Meridian is headed to Lisbon...",
+  "url": "https://x.com/stellarorg",
+  "renderedAt": "2026-04-13T06:59:12.395Z",
+  "renderTimeMs": 8071,
+  "payment": { "price": "$0.001", "network": "stellar:testnet" }
+}
+```
+
+## 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

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+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 STELLAR_PRIVATE_KEY = process.env.STELLAR_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 (!STELLAR_PRIVATE_KEY) {
+  console.error("ERROR: STELLAR_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(STELLAR_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);
+});

package-lock.json

@@ -0,0 +1,2068 @@
+{
+  "name": "rendergate",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "rendergate",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "@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"
+      }
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+      "license": "BSD-2-Clause",
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+        "punycode": "^2.1.0"
+      }
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+    "node_modules/urijs": {
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+      "resolved": "https://registry.npmmirror.com/urijs/-/urijs-1.19.11.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/valid-url": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmmirror.com/valid-url/-/valid-url-1.0.9.tgz",
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+    },
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+      "version": "1.1.2",
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+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/viem": {
+      "version": "2.47.14",
+      "resolved": "https://registry.npmmirror.com/viem/-/viem-2.47.14.tgz",
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/wevm"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@noble/curves": "1.9.1",
+        "@noble/hashes": "1.8.0",
+        "@scure/bip32": "1.7.0",
+        "@scure/bip39": "1.6.0",
+        "abitype": "1.2.3",
+        "isows": "1.0.7",
+        "ox": "0.14.15",
+        "ws": "8.18.3"
+      },
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+        "typescript": ">=5.0.4"
+      },
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+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/viem/node_modules/@noble/curves": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmmirror.com/@noble/curves/-/curves-1.9.1.tgz",
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+      "dependencies": {
+        "@noble/hashes": "1.8.0"
+      },
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+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
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+        "node": ">=10.0.0"
+      },
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+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
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+          "optional": true
+        },
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+          "optional": true
+        }
+      }
+    },
+    "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"
+    },
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+      "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"
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+      },
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+        "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"
+      }
+    }
+  }
+}

package.json

@@ -0,0 +1,24 @@
+{
+  "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": {
+    "@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"
+  }
+}

renderer.js

@@ -0,0 +1,98 @@
+import { chromium } from "playwright";
+
+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",
+    });
+
+    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 title = await page.title();
+    let content = await page.evaluate(() => {
+      const remove = document.querySelectorAll(
+        'script, style, nav[aria-label="Footer"], [role="complementary"]',
+      );
+      remove.forEach((el) => el.remove());
+      return document.body.innerText;
+    });
+
+    if (content.length > MAX_CONTENT_LENGTH) {
+      content = content.slice(0, MAX_CONTENT_LENGTH);
+    }
+
+    return { title, 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;
+  }
+}

server.js

@@ -0,0 +1,127 @@
+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 { renderUrl, closeBrowser } from "./renderer.js";
+
+const PORT = process.env.PORT || 3001;
+const PRICE = "$0.001";
+const NETWORK = "stellar:testnet";
+const FACILITATOR_URL = "https://www.x402.org/facilitator";
+const PAY_TO = process.env.PAY_TO;
+
+if (!PAY_TO) {
+  console.error("ERROR: PAY_TO not set in .env");
+  process.exit(1);
+}
+
+function isAllowedUrl(urlStr) {
+  try {
+    const parsed = new URL(urlStr);
+    if (!["http:", "https:"].includes(parsed.protocol)) return false;
+    const blocked = ["localhost", "127.0.0.1", "0.0.0.0", "[::1]"];
+    if (blocked.includes(parsed.hostname)) return false;
+    // Block private/link-local IP ranges
+    const parts = parsed.hostname.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;
+  } catch {
+    return false;
+  }
+}
+
+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;
+
+    res.json({
+      ...result,
+      renderTimeMs: elapsed,
+      payment: { price: PRICE, network: NETWORK },
+    });
+  } catch (err) {
+    console.error(`Render failed for ${decoded}:`, err.message);
+    if (err.message.includes("Too many concurrent")) {
+      return res.status(503).json({ error: err.message });
+    }
+    res.status(500).json({ error: "Render failed", message: err.message });
+  }
+});
+
+const server = app.listen(Number(PORT), () => {
+  console.log(`RenderGate listening on http://localhost:${PORT}`);
+  console.log(`  Pay ${PRICE} USDC on ${NETWORK} per render`);
+  console.log(`  Payments go to ${PAY_TO}`);
+});
+
+process.on("SIGTERM", async () => {
+  console.log("Shutting down...");
+  server.close();
+  await closeBrowser();
+  process.exit(0);
+});