Initial x402 spec dataset

README.md

@@ -1,3 +1,48 @@
 ---
+title: x402 Protocol Specification
+emoji: 💳
+colorFrom: green
+colorTo: gray
+sdk: static
+sdk_version: ""
+app_file: README.md
+pinned: false
 license: mit
 ---
+
+# x402 Protocol Specification
+
+HTTP 402 Payment Required for AI agent micropayments.
+
+## Overview
+
+x402 is the production implementation of HTTP 402 (reserved since 1998) for the autonomous agent economy. It enables machine-to-machine micropayments over USDC on Solana.
+
+## How It Works
+
+1. Agent requests a protected resource → HTTP 402 with payment challenge
+2. Agent parses challenge, submits USDC payment on Solana
+3. Gateway confirms settlement (~2-3 Solana slots)
+4. Protected resource is returned
+
+Total round trip: < 3 seconds. No humans. No redirects. No API keys.
+
+## Specification
+
+**Status**: v0.2.0 (active)
+
+- [Full docs](https://greensol.me/nullstate/docs/protocols/x402)
+- [Source code](https://github.com/nullstate/nullstate)
+- [Live gateway](https://greensol.me/nullstate)
+
+## Implementations
+
+| Implementation | Language | Status |
+|--------------|----------|--------|
+| NullState Gateway | Python | Production |
+| Coinbase AgentKit | TypeScript | Beta |
+| AEON Protocol | Rust | Beta |
+
+## License
+
+MIT — do whatever you want.

x402_spec.json

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+{
+  "name": "x402",
+  "version": "0.2.0",
+  "description": "HTTP 402 Payment Required for AI agent micropayments",
+  "network": "solana",
+  "currency": "USDC",
+  "round_trip": "~3s",
+  "authentication": "KYA (Know-Your-Agent)",
+  "signing": "RSA-2048 PKCS1v15-SHA256",
+  "status": "active"
+}