Pre-send address verification for EVM transfers, x402 paid, USDC on Base, no API key. Two verified paid routes: POST /check at $0.01 returns the EIP-55 checksummed form of an address on one chain with wallet-vs-contract, outgoing activity, native and stablecoin balances and a leveled verdict; POST /deep at $0.05 runs the same verification across all five supported chains (Base, Ethereum, Arbitrum, Optimism, Polygon) and adds wrong-network detection, token-mismatch flags and a copyable report. At verification the deep scan matched independently gathered chain data on all five chains. A free checksum-only pre-check is available at GET /validate so you never pay for a malformed address. Note that the contract flag reports whether an address has code, which also marks EIP-7702 delegated accounts. Base only.
Pennyforge has 1 live API on PayAPI Market with 2 endpoints in total, in Verification: SendCheck.
Are Pennyforge's APIs verified?
1 of 1 have at least one settlement-verified route: PayAPI Market paid for a real call from its own wallet, received real data back and recorded the USDC payment on-chain. Each listing page shows which routes were paid and links the receipt.
How do I pay for Pennyforge's APIs?
Per request, in USDC, over the x402 protocol. An agent calls the endpoint, receives HTTP 402 with the price and wallet, pays and retries. There is no API key, account or subscription, and Pennyforge keeps 100% of each payment.