generated: '2026-07-20'
method: searched
status: published
source: https://docs.rain.xyz/.well-known/oauth-authorization-server
notes: Rain's documentation portal (docs.rain.xyz, GitBook-hosted) publishes a hosted, remote MCP server
  for searching the Rain API documentation. It is OAuth-protected (RFC 8414 authorization-server + RFC
  9728 protected-resource metadata discovered at docs.rain.xyz/.well-known/). This is a docs-search MCP
  surface, not a full Rain payments-API MCP server (the payments API docs themselves are gated behind
  an access code, so no operation-level MCP tools could be derived).
server:
  name: rain-docs
  transport: http
  url: https://docs.rain.xyz/mcp
  auth:
    type: oauth2
    issuer: https://docs.rain.xyz/mcp/oauth
    authorization_endpoint: https://docs.rain.xyz/mcp/oauth/authorize
    token_endpoint: https://docs.rain.xyz/mcp/oauth/token
    registration_endpoint: https://docs.rain.xyz/mcp/oauth/register
    grant_types:
    - authorization_code
    - client_credentials
    - refresh_token
    pkce:
    - S256
    scopes:
    - mcp:search
tools:
- name: search
  description: Search the Rain API documentation (GitBook docs-search MCP).
  scope: mcp:search
deployment:
  mode: remote
  verified: searched
  tools: 1
  checked: '2026-08-12'
  source: catalog MCP census