chainquery Bitcoin RPC: pay-per-call Bitcoin Core over x402, no API key. Block header fields by hash from chainquery's independent full node: version, merkle root, time, bits, nonce, previous hash. Bitcoin Core getblockheader.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.005000 USDC | 0x7Cf4...87ff |