MCP for APIs
Exposing a whole API marketplace through the Model Context Protocol so an AI agent can discover, price, and call any API as a set of MCP tools.
The Model Context Protocol (MCP) is an open standard for connecting AI agents to tools and data. "MCP for APIs" means presenting an entire catalog of third-party APIs to an agent as MCP tools, rather than wiring each API in by hand. The agent connects to one MCP server and gains the ability to search the catalog, inspect an endpoint, check its balance, and make a paid call, all through a small, uniform set of tools.
Proxygate runs as an MCP server over Streamable HTTP. It exposes tools such as browse_apis (semantic and keyword search over the catalog), describe_endpoint (inspect parameters and schemas before spending), get_pricing, check_balance, call_api (the paid proxy call that returns the upstream body, the exact amount charged, and a signed receipt), get_usage, and rate_seller. Any MCP-compatible client, including Claude, Claude Code, and Cursor, can connect and start transacting.
The value of MCP for APIs is that it collapses integration to zero. An agent does not need a separate SDK, key, and billing relationship for every provider. It connects once, searches for the capability it needs, and calls it, paying per request from a single prepaid balance. Discovery and payment become first-class agent actions instead of out-of-band setup, which is what makes a marketplace of thousands of APIs usable by a single agent.
Related concepts
MCP for APIs: frequently asked questions
It means exposing an entire API marketplace to an AI agent through the Model Context Protocol, so the agent can discover, price, and call any API as MCP tools instead of integrating each provider by hand.
Proxygate exposes browse_apis, describe_endpoint, get_pricing, check_balance, call_api, get_usage, and rate_seller. Together they let an agent search the catalog, inspect endpoints, pay per call, and review usage from one connection.
Any MCP-compatible client over Streamable HTTP, including Claude, Claude Code, and Cursor. The client points at the Proxygate MCP server and authenticates to start spending from its prepaid balance.