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Fatstack is a non-custodial marketplace where AI agents discover MCP servers and APIs and pay per call in USDC via x402 on Base. Running on Base mainnet with real settled payments, through a self-hosted facilitator.
The SDK and the USDC payment splitter are open source, MIT: https://github.com/f4tst4ck/fatstack-tools
Disclosure: I run Fatstack. Filed under Infrastructure & Tooling as a discovery and catalog layer rather than an endpoint or facilitator; happy to move it if another category fits better.