generated: '2026-09-19'
method: searched
source:
- https://registry.npmjs.org/-/v1/search?text=mercury-x402
- https://registry.npmjs.org/mercury-x402-mcp
- https://network.mercury-hq.com/university/developers (MCP endpoint section)
description: >-
  One first-party package exists: mercury-x402-mcp on npm, a stdio MCP server that wraps the MERCURY
  catalog and pays per call over x402 from the operator's wallet. It is judged first-party because its
  README's discovery links point at https://mercury-x402-jed.fly.dev - the Fly.io origin that serves the
  byte-equivalent OpenAPI, llms.txt and catalog behind network.mercury-hq.com (confirmed 2026-09-19; the
  hosted MCP server's own initialize instructions name the same fly.dev host) - and its publisher
  "mercurynetwork" matches the app name. It is an MCP server, not a client SDK: the provider publishes no
  language SDK and its docs say "no Mercury SDK" is needed (verification is plain EIP-191 ecrecover; calls
  are plain HTTP with x402-fetch/x402-axios or a Bearer key). No SDKs pointer is emitted. Searched and
  absent: npm (mercury-hq, mercury-storefront), PyPI (mercury-x402, mercury-hq both 404), GitHub orgs
  mercury-hq / mercuryhq / mercury-x402 (404), Maven Central, NuGet, RubyGems, Packagist, crates.io,
  pkg.go.dev (no MERCURY artifacts by name). Third-party client libraries the docs recommend - x402-fetch,
  x402-axios, viem, @coinbase/cdp-sdk - belong to Coinbase / the x402 Foundation and are not listed here.
packages:
- language: javascript
  registry: npm
  name: mercury-x402-mcp
  url: https://www.npmjs.com/package/mercury-x402-mcp
  install: npx -y mercury-x402-mcp
  kind: mcp-server (stdio)
  official: true
  license: MIT
  version: 1.0.1
  published: '2026-06-07'
  first_published: '2026-06-05'
  versions: [1.0.0, 1.0.1]
  publisher: mercurynetwork
  bin: mercury-x402-mcp (index.mjs)
  dependencies: ['@modelcontextprotocol/sdk', viem, x402-fetch]
  repository: null
  homepage: null
  note: >-
    README (June 2026) describes 17 paid tools built live from the catalog plus free mercury_catalog and
    mercury_verify; the hosted server now lists 18 (cited-dns was added after the package shipped). Config:
    {"mcpServers":{"mercury":{"command":"npx","args":["-y","mercury-x402-mcp"],"env":{"MERCURY_PRIVATE_KEY":"<Base mainnet wallet key>"}}}}.
    The package has not been republished since 2026-06-07 while the live catalog and the hosted MCP server
    have moved on (server build 2026-09-16), so the tool list a stdio user gets is whatever the live
    /catalog returns at run time, not a pinned contract.