Need to convert ETH, gwei or wei without floating-point errors? Converts an amount between these units with exact decimal math, up to 28 significant digits ($0.001 per call).

Need a function selector or an event topic? Returns the Keccak-256 hash of a text string, in 0x hex ($0.001 per call).

One watched public API's contract record: current version, operation count and keys, deprecated operations, security schemes, and every dated change in the last 90 days with what broke. From the provider's published OpenAPI description, read daily. Without name=, lists the APIs we watch. Signed.

Is Base live, and what is the latest block? Returns number, timestamp, gas used, gas limit and transaction count of the latest block, or of a given numero ($0.001 per call).

France: French company verification (KYB) by SIREN in one call. Legal identity, intra-EU VAT number checked live in VIES, active/closed status, age, activity, headcount, establishments, insolvency proceedings from BODACC (safeguard, receivership, liquidation, closure), RGE/Qualiopi labels. Returns an explained verdict (favorable / vigilance / unfavorable) with stable, sourced signal codes. Official open data. Supplier verification for AI agents.

Macroeconomic indicators per country from World Bank Open Data with yearly history: inflation, GDP, GDP growth, GDP per capita, unemployment, population, government debt, current account, exports, lending rate. Optionally current ECB policy rates. Params: country (ISO2 or ISO3, required), indicators (default inflation, gdp, gdp_growth, unemployment, population), years (1 to 20, default 5), include_ecb_rates (default false).

The price of USYC (Circle's tokenized money market fund of short-term US Treasuries) from the oracle its Teller mints and redeems at, the yield its price shows over 7 and 30 days as a yearly rate, every published price on Arc, and the supply on Arc.

Base token due diligence over x402. /report bundles due diligence, cross-venue reference price and position exit cost in ONE $0.01 call. /price now takes up to 10 tokens per $0.01 call for bulk screening. Free /sample on every endpoint.

Paid AI-agent access to Blockchain.com Explorer API

Paid AI-agent access to Blockchain.com Explorer API

Live DNS records for a host name, with TTLs and whether the answers validated under DNSSEC. ?type= takes a comma-separated list of A, AAAA, CNAME, MX, TXT, NS, SOA, CAA.

Crypto perpetual futures funding rate, open interest, mark and index price, basis, bid and ask, order book depth and 24h volume: the latest value of every market across 19 venues (Aster Perpetuals, Avantis, Binance USD-M Futures, Bitget Perpetual Futures, Bybit Perpetuals, Coinbase Global Derivatives and 13 more). DQL filter, e.g. base in (BTC). Each value carries venue timestamp, receive time and age; stale values are withheld. No charge when nothing recorded is returned. 0.005 USDC per call.

Perpetual-futures funding rates and annualized carry for BTC, ETH, SOL and more, from exchange public market-data APIs, in one call. Free /preflight sample.

OHLCV candles for crypto perpetual futures, 1m to 1d, on trade price (mark and index where the venue publishes them), across 19 venues (Aster Perpetuals, Avantis, Binance USD-M Futures, Bitget Perpetual Futures, Bybit Perpetuals, Coinbase Global Derivatives, Coinbase — legacy API, migrated and 12 more). Built from venue 1-minute klines; periods with no data come back as gap rows, not interpolated. DQL filter, timeframe, from, to. No charge when no candle is returned. 0.005 USDC per call.

SEO title tag and meta description from a URL: reads the page and returns the current title and meta description with their lengths, a better title (max 60 characters), a meta description of 140 to 155 characters with a reason to click, an H1, 5 to 8 search phrases and the problems found. Optional keyword to build around (e.g. "windows Munich") and language. Written by Claude Haiku 5.5 from the page content only, no claims the page does not make. Not charged when the page cannot be read.

Find DeFi yield pools across 400+ protocols and 100+ chains (DefiLlama data): APY split into base and reward, 30-day mean APY, 7-day APY change, TVL, stablecoin flag, impermanent-loss risk. Filter by chain (e.g. 'Base', 'Ethereum'), project (e.g. 'aave'), token symbol (e.g. 'USDC'), stablecoin_only, min_tvl_usd (default 1,000,000); sort by 'apy' (default) or 'tvl'. Outliers (flagged by DefiLlama or above 500% APY) are excluded unless include_outliers is true.

European Central Bank reference rates against a base currency, latest or on a past date. A daily reference, not an executed price: for that see /v1/paid/fx/execution.

Current base fee + priority fee (gas price) for a chain (Alchemy). x402-paid, USDC on Base.

Perpetual funding rates across 7 venues (Binance, Bybit, OKX, Bitget, Hyperliquid, dYdX, Deribit), normalized to 8h and annualized. Free /sample.

eBay product search and item data API for AI agents: eBay search or item URLs return JSON listings or product details with titles, prices, condition, shipping and links when available. Supports marketplace research and price comparison. Provided by FastAF eBay Listings & Item Data. Price: $0.005000 USDC per successful call.