{"free_tier":"500 requests/day per IP, no key needed","paid":{"price_usd":5,"requests":50000,"how":["1. Send $5+ USDC on Base mainnet to 0x9895C261368DCE40903261518B7aF6D83eC03e0D","2. POST /v1/keys/redeem with {\"tx_hash\": \"0x...\"}","3. Receive your API key; pass it as X-Api-Key header"],"usdc_contract":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","chain":"Base mainnet (chain id 8453)","pay_to":"0x9895C261368DCE40903261518B7aF6D83eC03e0D"}}