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One call for an address on Base: USDC balance, ETH balance, verified primary Basename, transaction count (nonce) and whether it is a contract. Use it to profile a counterparty or payout wallet before interacting. Replaces four or five separate reads with a single priced request. Query: ?address=0x...

Base mainnet head: latest block number, block age in seconds, base fee and gas price in gwei. Use it to check the chain is advancing and to estimate fees before sending a transaction. One small JSON read instead of several raw RPC calls and unit conversions.

Live Base mainnet USDC and ETH balance for one address, read with eth_call at the latest block; returns decimal and raw values plus the block number. Use it to check a wallet can cover a payment or that funds arrived before acting. Simpler than running an RPC client and decoding ERC-20 calls yourself, and the block number makes each reading reproducible. Query: ?address=0x...

Pre-pay Check: Ed25519-signed, deterministic facts about another x402 endpoint before you pay it: challenge validity, reachability and latency, host listing count, payout wallet reuse across hosts, last-called and payer trend from daily Bazaar snapshots. Use it when choosing between paid endpoints. Signed facts you can verify against the published key, not ratings; facts only, no advice. Query: ?url=https://...

Resolve a Basename (name.base.eth) to its Base address, or an address to its primary Basename, checked both ways so a reverse name is only returned when it resolves back. Use it to turn a human name into a payout address or to label an address. Avoids hand-written ENS-style namehash and resolver calls. Query: ?name=jesse.base.eth or ?address=0x...

Base mainnet transaction status: success, failed or pending, with block, confirmations, gas used, effective gas price, from/to and log count. Use it after sending or receiving a payment to confirm it landed and how deep it is. One normalized JSON answer instead of combining receipt and block calls and computing confirmations yourself. Query: ?hash=0x...