Foundry

Endpoints (222 live)

• POST /v1/base-tx-explain — Base transaction explained from the chain: success or reverted, block and time, from, to, ETH value, method selector, gas used and fee, contract created, and every ERC-20 transfer decoded with token symbol and amount. Input: 0x transaction hash. Deterministic, no LLM. (0.002 USDC on Base)
• POST /v1/base-contract-facts — Base contract fact sheet from the chain: is it a contract, proxy type (EIP-1967, beacon, EIP-1167 clone, ZeppelinOS) with implementation and admin, owner and whether ownership is renounced or held by a contract (multisig) or single key, privileged powers found in bytecode (mint, pause, blacklist, fee/tax setters, trading switch, tx limits, upgrade), current paused state, ERC-20 name/symbol/decimals/supply. Facts only, no verdict. Input: 0x address. (0.005 USDC on Base)
• POST /v1/base-gas — Current Base mainnet gas: latest block, base fee and priority fee in gwei, a suggested max fee, and the ETH cost of a typical USDC transfer. Input: any text, e.g. 'base'. Deterministic, no LLM. (0.001 USDC on Base)
• POST /v1/base-address-info — Base address lookup from the chain: wallet (EOA) or contract, bytecode size, ETH balance, USDC balance and number of transactions sent. Useful before sending funds or paying an address. Input: 0x address. Deterministic, no LLM. (0.001 USDC on Base)
• POST /v1/x402-preflight — x402 preflight: checks a paid x402 endpoint before a payment is signed. Probes it unpaid, parses the v1 body or v2 PAYMENT-REQUIRED header, lints every accepts[] option (network, canonical USDC, EIP-712 domain name/version that signatures verify against, EIP-55 payTo, zero payTo, amount, timeout, testnet, resource host) and returns ok/warn/block with reasons. Input: URL, optionally 'POST <url>'. Deterministic, no LLM. (0.005 USDC on Base)
• POST /v1/dns-lookup — DNS lookup: A, AAAA, MX, TXT, NS, CNAME, SOA or CAA records for a domain, via DNS-over-HTTPS. Input: 'example.com MX'. (0.001 USDC on Base)
• POST /v1/email-validate — Email validation: syntax, MX records, disposable domain and role account checks. Input: an email address. (0.001 USDC on Base)
• POST /v1/dev-joke — Programming joke: one short, safe-for-work developer joke per call. Input: any text. (0.001 USDC on Base)
• POST /v1/crypto-price — Crypto price in USD for up to 20 coins (BTC, ETH, SOL...) or tokens by chain:address, from DefiLlama. Input: 'BTC,ETH'. (0.001 USDC on Base)
• POST /v1/x402-market-scan — x402 market scan: for a topic, the top CDP Bazaar listings and who actually gets paid, measured on-chain: each seller's USDC received in the last 24 hours, payments and distinct payers, plus how many sellers earned nothing and the median price. Real demand before you build. Input: a topic, e.g. 'token security'. No LLM. (0.01 USDC on Base)
• POST /v1/x402-listing-doctor — x402 listing doctor for sellers: why a paid endpoint gets no buyers. Runs the x402 preflight, Coinbase's CDP validator, and presence checks in the CDP Bazaar and 402index, then returns concrete fixes: 402 before input validation, Bazaar metadata, description over 500 chars or instruction-like, slow or sleeping host, no settled sale yet. Input: endpoint URL, optionally 'POST <url>'. Deterministic, no LLM. (0.005 USDC on Base)
• POST /v1/time-now — Current time in any timezone: ISO time, unix timestamp, UTC offset, weekday. Input: IANA timezone, e.g. 'Europe/London'. (0.001 USDC on Base)
• POST /v1/trivia — Trivia questions with answers and options from the Open Trivia Database. Input: how many, 1 to 10. (0.001 USDC on Base)
• POST /v1/qr-code — QR code generator: PNG data URI and SVG for any text or URL. Input: the text or URL to encode. (0.001 USDC on Base)
• POST /v1/favicon — Favicon finder: a site's favicon and icon URLs. Input: a URL. (0.001 USDC on Base)
• POST /v1/bmi — BMI calculator: body mass index and WHO category from weight and height. Input: 'weight kg, height cm'. (0.001 USDC on Base)
• POST /v1/roman-numeral — Roman numeral converter: numbers to Roman numerals and back (1 to 3999). Input: '2026' or 'MMXXVI'. (0.001 USDC on Base)
• POST /v1/card-validate — Credit card number validator: Luhn checksum and card brand (Visa, Mastercard, Amex...). Format check only, never stored. Input: a card number. (0.001 USDC on Base)
• POST /v1/dns-propagation — DNS propagation check: compares answers from Cloudflare and Google resolvers. Input: 'example.com A'. (0.001 USDC on Base)
• POST /v1/rss-feed — RSS and Atom feed reader: latest items with titles, links and dates. Input: a feed URL. (0.001 USDC on Base)

+202 more endpoints.