X402 A2a Hub
@garyedgington
A discovery hub for AI agents navigating the x402 micropayment ecosystem. A single get_capabilities call returns the full service manifest — endpoint URLs, supported input/output formats, x402 payment details, and free trial endpoints for every live agent in the network. Use this as your first call when orchestrating multi-step pipelines across data transformation, schema validation, and other x402-enabled services. Free — no payment required.
Overview
x402 A2A Hub
Capability discovery hub for the x402 micropayment task market. Exposes a unified manifest of all live services so agents can discover, price-check, and chain calls without hardcoded URLs.
Live service: https://project-a2a-production.up.railway.app
Discovery endpoints
| Endpoint | Description |
|---|---|
GET /v1/capabilities | Full JSON capability manifest — all services, endpoints, payment details, trial URLs |
GET /.well-known/x402 | x402 protocol discovery document |
GET /llms.txt | Plain-text service descriptions optimised for LLM/agent semantic search |
GET /health | Health check — {"status":"ok","service":"a2a-hub"} |
Capability manifest
GET /v1/capabilities returns a structured manifest of every service in the pipeline:
{
"version": "1.0",
"provider": "Gary Edgington",
"description": "x402 micropayment task market — data transformation and validation pipeline.",
"services": [
{
"id": "formatter",
"name": "Data Formatter",
"description": "Converts CSV to JSON, XML to JSON, or Markdown to HTML.",
"endpoint": "https://project-formatter-production.up.railway.app/v1/format",
"trial_endpoint": "https://project-formatter-production.up.railway.app/v1/format/trial",
"payment": { "scheme": "x402", "network": "eip155:8453", "price_usd": 0.005 }
},
{
"id": "schema-checker",
"name": "JSON Schema Checker",
"description": "Validates JSON payloads against JSON Schema Draft 7.",
"endpoint": "https://projectx402-production.up.railway.app/v1/schema-check",
"trial_endpoint": "https://projectx402-production.up.railway.app/v1/schema-check/trial",
"payment": { "scheme": "x402", "network": "eip155:8453", "price_usd": 0.005 }
}
]
}
Pipeline
Agents can chain services discovered via this hub:
Raw Input → Formatter (/v1/format) → Schema Checker (/v1/schema-check)
Each hop settles independently on Base mainnet via x402. The A2A hub itself has no payment gate — it is permanently free to query.
Stack
- FastAPI + Uvicorn
- No Claude API dependency (pure manifest/routing logic)
- Deployed on Railway
Related
- Data Formatter:
https://project-formatter-production.up.railway.app- MCP SSE:
/mcp/sse— listed on Smithery
- MCP SSE:
- Schema Checker:
https://projectx402-production.up.railway.app
Server Config
{
"mcpServers": {
"x402-a2a-hub": {
"url": "https://project-a2a-production.up.railway.app/mcp/sse"
}
}
}