Blockchain And Crypto x402 offerings

x402 services ranked by 30-day on-chain settlement volume, optionally by category.

A structured token/contract risk report for a Base contract: a normalized risk score, a pass/warn/fail checklist (bytecode present, sanctions, verified source, ownership, holder concentration) and a single verdict. $0.05.

Lint any x402 endpoint or payment header against the v2 spec and real CDP facilitator behavior: CAIP-2 network ids, atomic amounts, the EIP-712 domain-name trap ('USD Coin' on Base mainnet vs 'USDC' on Sepolia — wrong name = every settlement fails), the extensions echo Coinbase Bazaar requires for indexing, expired authorizations. Findings as error/warning/info with what will actually break. Built by a seller that debugged all of these in production.

The latest transactions of any wallet on Base, normalized for agents: hash, direction (in/out), counterparty address and explorer name, native value, method called, status, fee and timestamp. Up to 5…

EIP-55 mixed-case checksum for a 20-byte EVM (Ethereum/Base) hex address, via Keccak-256. Normalize and verify addresses before a transfer.

Lint any x402 endpoint or payment header against the v2 spec and real CDP facilitator behavior: CAIP-2 network ids, atomic amounts, the EIP-712 domain-name trap ('USD Coin' on Base mainnet vs 'USDC' …

Base58-decode a Bitcoin/Solana string to raw bytes, returned as hex and base64. Rejects invalid symbols.

Private ordered list/queue for an agent: push/pop/peek/range/length/clear, scoped to the paying wallet. For task queues, event logs, buffers.

Crypto market sentiment in one call: the Fear & Greed index (0-100 with classification) plus global market stats — total market cap, 24h volume, BTC/ETH dominance and 24h change. Free public data, $0…

A structured token/contract risk report for a Base contract: a normalized risk score, a pass/warn/fail checklist (bytecode present, sanctions, verified source, ownership, holder concentration) and a …

Stablecoin market data with the number agents paying in USDC actually need: current price and PEG DEVIATION per coin, circulating supply, peg mechanism and chains, ranked by market cap. Filter by symbol or screen for depegs (absolute deviation above a threshold). Open DefiLlama data, refreshed every 10 minutes.

Who does this wallet transact with? Recent activity (~100 transactions) aggregated into a ranked counterparty list: address, explorer name where known, interactions in/out, total native value, first/…

One call, the whole pre-trade picture: crypto market sentiment (Fear & Greed + global stats), live Base gas/block, optional token price(s) and related prediction-market odds. A bundled decision snaps…

Cheap generic EVM reads on Base for AI agents: native balance, nonce, contract code, ERC-20 token balance, eth_call, gas price, latest block, and transaction/receipt lookups. One call, read-only, $0.001.

DeFi protocol fundamentals in one call: current TVL, 1-day and 7-day change, category, chains and website for any protocol — search by name, or screen the whole universe by category and chain ranked by TVL. Open DefiLlama data, refreshed server-side every 15 minutes.

Current token prices for up to 10 tokens per call, on any chain: address as <chain>:<address> (base:0x…, ethereum:0x…) or coingecko:<id> for majors. Aggregated market price with a confidence score and timestamp, from DefiLlama's open price engine. $0.002 — priced for agents that check before every trade.

Compute the SHA-1 hash (hex digest) of an input string. Deterministic fingerprints and git-style content identifiers.

Atomic per-agent integer counter (incr/decr/get/set/reset), scoped to the paying wallet. For tallies, quotas, sequence numbers.

Search every tracked DeFi yield pool with TVL over $50k: filter by chain, project, token symbol, stablecoin-only and minimum TVL, ranked by APY with base/reward split and IL risk. Open DefiLlama data…

EIP-55 mixed-case checksum for a 20-byte EVM (Ethereum/Base) hex address, via Keccak-256. Normalize and verify addresses before a transfer.

Full wallet profile on Base in one call: native balance, nonce, EOA vs contract vs EIP-7702 delegated, total transaction count, ERC-20 holdings with USD values where known, and public tags — from pub…

Private key/value memory for an agent: remember values across calls (set/get/delete/list/exists), scoped to the paying wallet.

Cheap generic EVM reads on Base for AI agents: native balance, nonce, contract code, ERC-20 token balance, eth_call, gas price, latest block, and transaction/receipt lookups. One call, read-only, $0.…

Base58-encode bytes with the Bitcoin/Solana alphabet (no 0, O, I, l) — the encoding behind BTC and Solana addresses.