"Collaboration Between Multiple AIs via MCP (Master Control Program)" matching MCP connectors:

Signed declarations of HTTP API exchanges for agent handoffs. Free preparation and verification; receipt issuance costs 0.002 USDC via x402 on Base. Start and connect: https://datoka.dev/api. Signatures attest declared data, not independent truth.

Paid OpenAPI audit and API change detection for agents. $0.10 USDC per analysis via x402 on Base.

Search the JoJ API marketplace, read endpoint docs, and call any API with one key via one gateway.

Cache-Control max-age shape

JSON Schema validator for API payloads via MCP: bounded checks and structured pass/fail errors.

OneOAuth

ai.withone

Find, document and execute authenticated API calls across 700+ apps via one MCP server

Unified gateway exposing 150+ tools across all NexGenData MCP servers via one endpoint.

Grafbase

com.grafbase.api

The Grafbase MCP server sits in front of a GraphQL API and exposes an MCP protocol-compliant interface that allows AI agents and LLMs to explore and query GraphQL APIs using natural language. It provides tools to search schemas, introspect types and fields, and execute GraphQL queries while minimizing context bloat by returning only relevant schema subsets, with built-in support for authentication, authorization, and configurable access control.

MCP server (stdio): lint OpenAPI specs with Spectral via the AgentForge API

MCP server (stdio): check if URLs are alive (status, redirects, latency) via the AgentForge API

MCP server (stdio): validate JSON against JSON Schema (draft-07 / 2020-12) via the AgentForge API