# Superspice — agent-payable APIs > A directory of APIs payable by AI agents via the x402 protocol (HTTP 402 Payment Required, USDC on Base). Each seller below publishes a machine-readable menu (ai-catalog.json) of their endpoints and prices. ## Sellers - [Papaya Press](https://gw.superspice.xyz/g/papaya-press/.well-known/ai-catalog.json) — 2 endpoints - [Superspice Demo](https://gw.superspice.xyz/g/superspice-demo/.well-known/ai-catalog.json) — 2 endpoints