Toolfi

This is an API marketplace where Claude can discover and pay for external data tools using USDC on Base, without needing API keys or manual setup. When Claude hits an endpoint, it gets a 402 Payment Required response with payment instructions, sends USDC on-chain, then retries with the transaction hash to get the data. It ships with ten crypto tools including DexScreener price feeds, GoPlus rug checkers, Li.Fi bridge routing, and DefiLlama yield data. Prices run from 0.0005 to 0.005 USDC per call. You can also publish your own APIs to the registry and collect payments. Currently on Base Sepolia testnet. Reach for this if you want Claude to autonomously fetch crypto market data and pay for it programmatically.