Abstraxn

git clone https://github.com/Abstraxn-Labs/abstraxn-agent-layer.git cd abstraxn-agent-layer npm install cp .env.example .env # Edit .env: Postgres connection + UPSTREAM_RELAY_BASE_URL / ENRICHMENT_RELAY_BASE_URL # (each required for its own group of paid tools) npm run start:dev

- Health check:GET http://localhost:3011/health
- MCP endpoint:POST http://localhost:3011/mcp
- API docs (health only):http://localhost:3011/api/docs

Database migrations run automatically on boot — no separate CLI step needed.

Add this to your MCP client's config (e.g.claude_desktop_config.jsonor Cursor'smcp.json):

{ "mcpServers": { "abstraxn-public-web3": { "url": "http://localhost:3011/mcp" } } }

Restart the client and the tools below become available to it — no further setup.

Tools are namespaced by area (network.,market.,web3.,travel.,places.,social.) so an MCP client can browse them as a tree rather than a flat list.

How paid tools work:call one with no payment, and you get back apaymentRequiredchallenge (not an error). Your wallet client signs it and retries the same call withpaymentPayloadset — your wallet pays directly; this service only relays the request.

Most people will use an MCP client (above), but the endpoint is plain JSON-RPC over HTTP if you want to script against it directly:

BASE=http://localhost:3011 ACCEPT='Accept: application/json, text/event-stream' # required by the MCP spec # 1. Initialize a session curl -s -X POST "$BASE/mcp" -H 'Content-Type: application/json' -H "$ACCEPT" \ -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"my-client","version":"1.0"}}}' # 2. List available tools curl -s -X POST "$BASE/mcp" -H 'Content-Type: application/json' -H "$ACCEPT" \ -d '{"jsonrpc":"2.0","id":2,"method":"tools/list"}' # 3. Call a tool curl -s -X POST "$BASE/mcp" -H 'Content-Type: application/json' -H "$ACCEPT" \ -d '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"network.token_price","arguments":{"symbol":"bitcoin"}}}'

GET /mcpreturns405by design — every call is stateless, so there's no session to resume.

MCP client (Claude Desktop, Cursor, your agent) → POST /mcp (this service, stateless — a fresh McpServer per request) → free tools: direct chain RPC / CoinGecko calls → paid tools: relayed upstream, settled by the caller's wallet via x402

This is a single, standalone deployable — it doesn't share a workspace or database with any other Abstraxn service. That's deliberate: several MCP registries expect a public MCP server to live in its own repo with one route and one fixed tool set, reviewable end to end.

Postgres is used for abuse tracking only — no tenant, policy, or config tables exist:

If Postgres is unreachable, a call still succeeds — tracking writes are best-effort and never block or fail a real MCP request.

Since anyone can call this service with no key, a few invariants matter:

- No SSRF surface:every outbound URL (chain RPC, upstream relay, CoinGecko) comes from server-side config — no tool accepts a caller-supplied URL.
- Rate limiting is global and IP-keyed— the only lever available with no accounts. If you deploy behind a reverse proxy, setapp.set('trust proxy', ...)inmain.ts, or the limiter ends up rate-limiting the proxy instead of real callers.
- No secrets beyond the DB password, which is env-only and never logged.
- CORS is wildcardby design — nothing tenant-specific ever crosses an origin here.

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