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MCP Server Probe
x402
MCP Server Probe is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Runs initialize and tools/list against a Model Context Protocol (MCP) server to discover its protocol version, capabilities, tools, and authentication requirements before wiring it into an agent.
Price / call$0.05
Success—
StatusUnknown
How this service works
MCP server probe (streamable HTTP): runs initialize and tools/list against a Model Context Protocol server and returns protocol version, server name/version, capabilities, instructions, tool count and the tools (name, description, input properties), whether a session id is issued, whether it answers with JSON or SSE, and if the server requires OAuth (401 + resource metadata). Discover what an agent can call before wiring it in. $0.01 per server.
Output
Returns the MCP server's protocol version, server name and version, declared capabilities, instructions, total tool count, full tool list (each with name, description, and input schema properties), whether a session ID is issued, whether the server responds with JSON or SSE, and whether OAuth is required (detected via 401 + resource metadata).
Example use cases
Pre-integration MCP server audit
“Before I wire in the MCP server at https://myservice.io/mcp, can you probe it and tell me all the tools it exposes, whether it needs OAuth, and what protocol version it's running?”
Comparing two MCP servers side by side
“I have two MCP servers — https://alpha.example.com/mcp and https://beta.example.com/mcp — can you probe both and tell me which tools each one has and how their capabilities differ?”
Debugging MCP server authentication
“My agent keeps getting 401 errors connecting to https://vendor.io/mcp/v1. Can you probe it and tell me whether it requires OAuth and what resource metadata it returns?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/dev/mcp-probeWhen to prefer
Use this endpoint when you need to inspect an MCP server before integrating it into an agent pipeline — especially to enumerate available tools, detect authentication requirements, or verify protocol compatibility. Prefer this over manually parsing MCP responses or writing your own probe logic. It is purpose-built for MCP discovery and costs only $0.01 per call, making it ideal for lightweight pre-flight checks before agent wiring.
Side effects
- Server unreachable or DNS failure — returns connection error
- Server does not implement MCP protocol — returns malformed or unexpected response
- OAuth-protected server returns 401 without resource metadata — partial auth info only
- Server times out during initialize or tools/list handshake — returns timeout error
- Rate limiting or firewall blocks the probe request — returns HTTP error code
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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