x402 Discovery MCP

rplryan/x402-discovery-mcp

Connects Claude to x402Scout's live catalog of payment-enabled APIs, letting you discover and verify x402 services by capability, price, uptime, and ERC-8004 trust scores. Five discovery tools handle semantic search, health checks, compliance scanning, and service registration. Four relay tools route payment intents to matching services and execute x402 transactions autonomously. Reach for this when building agents that need to discover and call micropayment APIs on the fly, or when you want real-time quality signals on x402 endpoints before committing to a call. Paid operations settle in USDC on Base mainnet, with most queries costing a fraction of a cent.

GitHub stars: 2
tools: 5
transport: SSE
last updated: Mar 9, 2026

View on GitHub

Tools

5 tools

Public tool metadata for what this MCP can expose to an agent.

x402_discoverDiscover x402-payable services matching a query. Returns matching endpoints with quality signals (uptime, latency, payment details). Each query costs $0.005 USDC via x402 protocol.1 params

Discover x402-payable services matching a query. Returns matching endpoints with quality signals (uptime, latency, payment details). Each query costs $0.005 USDC via x402 protocol.

Parameters* required

querystring

Natural language or keyword search (e.g. 'weather', 'llm', 'research')

x402_browseBrowse all registered x402-payable services with optional filtering by category. Returns the full catalog for free — no payment required.2 params

Browse all registered x402-payable services with optional filtering by category. Returns the full catalog for free — no payment required.

Parameters* required

categorystring

Optional category filter: data, compute, research, agent, utility

limitinteger

Max results to return (default 20)default: 20

x402_healthCheck the health and uptime statistics of a specific x402 service by URL. Free — no payment required.1 params

Check the health and uptime statistics of a specific x402 service by URL. Free — no payment required.

Parameters* required

urlstring

The endpoint URL of the service to check

x402_trustGet the ERC-8004 on-chain trust profile for a service or wallet. Returns identity verification, reputation score, and third-party attestations. Free — no payment required.1 params

Get the ERC-8004 on-chain trust profile for a service or wallet. Returns identity verification, reputation score, and third-party attestations. Free — no payment required.

Parameters* required

wallet_or_urlstring

Ethereum wallet address (0x...) or service URL to look up

x402_registerRegister a new x402-payable service in the discovery catalog. Free to register — no payment required.8 params

Parameters* required

categorystring

Service category: data, compute, research, agent, utility

descriptionstring

What the service does and what kind of data it returns

namestring

Human-readable name of the service

networkstring

Network name (default: base)default: base

price_usdnumber

Price per request in USD (e.g. 0.005)

tagsarray

Capability tags (e.g. ['weather', 'forecast', 'real-time'])

urlstring

The public HTTPS URL of the x402-enabled endpoint

walletstring

Ethereum wallet address that receives payments (optional)

Readme

x402 Service Discovery MCP Server

⭐ Star to help others find this — if x402Scout has saved you time, a star helps other developers find it

The community-built Bazaar for the x402 agentic economy — a continuously growing catalog of live services with real-time quality signals, facilitator-compatibility checks, and ERC-8004 trust scoring. The discovery layer that Coinbase's own PROJECT-IDEAS.md asked the community to build.

View the full README on GitHub

Details

Repository: github.com/rplryan/x402-discovery-mcp
Website: x402scout.com
Transport: SSE
Registry: MCP registry, active