Payment Lab ping — liveness + your settlement receipt — $0.002 USDC

Palmyr: GET /domains/herbrainai.xyz/dns

Live state of every perpetual-futures market in one call: per coin the mark and oracle price, hourly funding rate with annualized APR, premium, open interest, max leverage, previous-day price, and 24h USD and base volume. Native crypto-derivatives data — funding and open interest are perp-only, absent from any spot feed. Free on-chain DEX data (venue: Hyperliquid), no key. From x402stock

The effective federal funds rate — the Fed's benchmark policy rate that anchors every other US interest rate — as a monthly average in percent, with the latest value, prior month, month-over-month and year-over-year change, and recent history. No ticker needed. The rate every rate-sensitive analysis starts from. Sourced from the St. Louis Fed (FRED). From x402stock

Palmyr: GET /domains

Arbitrum token verdict - send a token contract address, get a 0-100 risk score: is it a scam or honeypot, buy/sell tax, owner privileges, liquidity

Brazilian company registry (CNPJ) lookup - legal name, status, activity, address and partners

Ethereum contract storage slot - raw 32-byte value with uint and address decodings

Optimism token verdict - send a token contract address, get a 0-100 risk score: is it a scam or honeypot, buy/sell tax, owner privileges, liquidity

ERC20 token balance for any Ethereum wallet - USDC, WETH or any token via balanceOf, plus native ETH, up to 20 tokens in one call

Polygon token verdict - send a token contract address, get a 0-100 risk score: is it a scam or honeypot, buy/sell tax, owner privileges, liquidity

Crypto token price by contract on any chain - USD price, 1h/6h/24h change, liquidity, volume and FDV

EVM Wallet Balances (arbitrum). Arbitrum ERC-20 token balance and native ETH balance for any wallet: up to 20 ERC-20 tokens (?tokens=) in one call, with symbols, decimals and human-readable amounts. Live chain head.

Polygon contract storage slot - raw 32-byte value with uint and address decodings

Optimism contract storage slot - raw 32-byte value with uint and address decodings

NFT owner of an ERC-721 token (ownerOf) on Base, Ethereum, Arbitrum, Optimism or Polygon

ERC-1155 balance - how many copies of a token id a wallet holds, on 5 EVM chains

Base contract storage slot - raw 32-byte value with uint and address decodings

Arbitrum contract storage slot - raw 32-byte value with uint and address decodings

Brazilian postal code (CEP) to address - state, city, neighborhood and street