Onchain & crypto

Compute keccak256/sha256, a 4-byte function selector, an event topic0, or an ENS namehash/labelhash from a string or hex input.

The latest block number on Ethereum, Base, Polygon, Arbitrum or Optimism from keyless public nodes with fallback. Use it as the cheapest possible on-chain read: a liveness check for a chain, a timestamp anchor for a query, or the first paid call to prove an x402 client works end to end.

List crypto up/down prediction markets

Paginated transfers where merchant is recipient

CoinStats current Fear & Greed Index — sentiment score from Extreme Fear (0) to Extreme Greed (100)

Matches declared classification tokens against a supplied published dual-use control list. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. This is neither legal advice nor customs advice.

US ground stops and ground delay programs from FAA: airports with active ground stops or ground delays, reasons and average delay. Key for flight disruption monitoring. 全美地面停飞与地面延误：受影响机场及原因、平均延误。地上停止プログラム。Programas de retraso en tierra. 지상 정지 프로그램. Accepts payment on Base or Solana — either network works.

Live ETC to USD price (Ethereum Classic / US Dollar). Zero-param: GET returns current price. 以太经典美元实时价格行情。イーサリアムクラシック/米ドル 価格。Precio Ethereum Classic dólar. 이더리움클래식 달러 시세. etc usd, etc-usd, ETC price. Accepts payment on Base or Solana — either network works.

Gives you official United States inflation numbers from the government's BLS Consumer Price Index. Ask for the newest reading, a specific month in the past, or a whole range of months, and get back clear percentages for overall inflation and 'core' inflation (which ignores food and energy prices), plus a plain-English summary sentence.

Compile Solidity contracts with the Remix compiler, supporting multiple files, custom versions, and optimization settings

Perpetual-futures market data from Hyperliquid for any coin (BTC, ETH, SOL, HYPE…): mark price, hourly funding rate and its annualized APR, open interest in coin and USD, 24-hour notional volume, 24h price change, and max leverage, across 200+ perp markets. Sort by volume, open interest, or funding. Track the perp market the way trading agents do. Sourced from Hyperliquid.

Get a Firebase ID token for authenticating with the callable APIs

Complete crypto and DeFi snapshot in ONE call for AI agents: spot prices for your tokens, full market data (market cap, 24h volume, supply, 24h change) for the lead token, top-10 chains by TVL, and the best yield pools by APY. Prices, market, TVL and yields together — the most complete crypto+DeFi call per request.

BTC price / Bitcoin spot price in USD, live. Use when you need to answer: What is BTC worth? Multi-source with a fixed fallback order — Coinbase, then Kraken, then Pyth Hermes — first finite quote wins. Returns the price, the venue that served it, and a Pyth confidence interval when Pyth did.

Base chain status from Otto's configured RPC: latest, safe, finalized and pending heads with validated mined block hashes; pending hash nullable and provisional. Public source ID, per-head observation times and retrieval window disclose non-atomic RPC reads. Base fee, congestion, finality lag and block age at observation, separate from cache staleness. Refreshed every minute. $0.001 per call.

Find the DEX pools a tokenized US stock or ETF is a member of, on Robinhood Chain, Base, BNB Chain or Solana. Returns pool id (v4 ids kept distinct from v3), DEX, the side the asset is on, the counterpart with an evidence-backed class, reported USD liquidity, 24h volume and pool age. Membership discovery only: a provider-covered read, not a census; no APR, no execution; a return is the asset's only where it is the base token. $0.001 per call.

Search DEX pools across Base, Ethereum, Solana, Polygon, BSC, Arbitrum, Optimism and Avalanche by token symbol, name, or contract address. Returns pool address, DEX, price USD, 24h volume, liquidity (TVL), FDV, 24h price change and 24h txns as flat JSON numbers — no nested joins. Pool search, pool finder, DEX pools, liquidity pools, onchain pool lookup. $0.001 per call.

Safety verdict for one Solana token mint: a graded risk score with the concrete reasons behind it, mint and freeze authority state, how much of the liquidity pool is locked, top-holder concentration, holder count and whether the token is verified. Use it before an agent buys, quotes, or recommends an unfamiliar token, and to screen a list of mints in seconds.

Top DeFi yield pools with APY/TVL, filterable by chain (DefiLlama).

Token price lookup. Pass coin identifiers as `/v1/defillama/prices/{coins}` (e.g. `coingecko:bitcoin`, `ethereum:0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2`). Supports comma-separated lists.

Realized Price — Realized Price is Realized Cap divided by current supply. It represents the volume-weighted average price at which every unit of circulating supply last moved on-chain. Data by Glassnode.

Describe a task in plain language (or name a tool slug) and the Smart Order Router resolves the best-matching tool across this catalog and the open x402/MPP seller index, then runs it in the same call and returns the result with a receipt. Flat price covers any tool listed at $0.005 or less. Use it when an agent wants one paid request that both finds and executes the right capability.

Solana priority fee estimates via x402: micro-lamports per compute unit for global, Jupiter, Raydium or custom account keys. Lookback 1-150 slots (default 50), 20-second cache. Network fee evidence, not a wallet check; no transaction inclusion guarantee.

Header-level detail for one block on Ethereum, Base, Polygon, Arbitrum, or Optimism: hash, timestamp (unix + ISO), transaction count, gas used/limit, base fee. Pass a block number, 0x hex, or "latest". Keyless multi-endpoint failover.

Trending coins on CoinGecko in the last 24 hours, ranked by user search activity on the site (currently ~15 results). Includes coin id, symbol, market cap rank, current price (BTC-denominated), and score. Useful signal for detecting narrative shifts before they hit price charts.

Crypto Fear & Greed Index: current reading (0-100, Extreme Fear to Extreme Greed) plus 7-day and 30-day sentiment trend (rising/falling/flat with the average and point change), not just a single snapshot number. Not ticker-specific. Data from alternative.me. $0.01/call.

x402 Doctor checkup of any x402 endpoint, without buying: whether it answers with a valid payment request, its x402 version and any problems in it, the prices and networks it asks for, its payTo wallets and response time.

Wallet holdings across 12 chains in one call: native and known-token balances on Ethereum, Base, BNB Chain, Arbitrum, Monad, Robinhood Chain, Polygon, Avalanche, Plasma, Optimism, Solana and Hyperliquid. POST /v1/portfolio with {address} (0x or ENS) and optional chains; default is Ethereum only. Pay per request in USDC; no account, no API key.

Get the current Base mainnet block number (latest chain height) for an autonomous agent.

Chainlink price feed reads for three pairs: ETH/USD and BTC/USD on Ethereum (chain 1) and MATIC/USD on Polygon (chain 137). POST /v1/price with {pair, chain_id} and get the latest answer, feed address and update time. Any other pair answers 400. Pay per request in USDC; no account, no API key.