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MCP tools are cataloged by the Bazaar with a schema that mirrors the Model Context Protocol tool definition, plus the payment terms that make them x402-payable.

Listing schema

Publishing (seller side)

MCP servers built with @stellarx402/mcp publish automatically on startup. Manual publish:

Consumption (buyer side)

Returns the same listings you would get from /discovery/search?type=mcp — this endpoint is a convenience that pre-filters by type.

Invocation

An agent invokes an MCP tool through its MCP client (transport-agnostic), attaching an X-Payment header shaped identically to the HTTP case. See MCP Integration for Agents.