Crypto & Blockchain

Get an ERC-20's name, symbol, decimals, total supply, holder count and USD rate in one call. An ERC-20 on Base in one call: name, symbol, decimals, total supply, holder count, contract type and USD rate when Blockscout knows it. Query: ?address=0x…

Find the current prices shown on a product or listing page, with currency and context. Every monetary amount found on a page with its currency and surrounding context, plus the schema.org Offer price when the page declares one. Works on any product page, not only marketplaces. Fetche…

Crypto and blockchain news from four newsrooms in one call (Cointelegraph, Decrypt, The Block, CoinDesk), deduplicated and sorted newest first: title, link, publication time, summary and source. Optional keyword filter. Query: ?q=bitcoin etf&limit=20

Stablecoin market in one route: top stablecoins by supply with peg price, deviation and 24h/7d supply change, one coin's peg health with its top chains, or stablecoin supply per blockchain Stablecoin market in one route: the top stablecoins by circulating supply with peg price, deviat…

Get ETH, USDC and up to ten ERC-20 balances of one address in a single call, human-readable. ETH plus USDC plus up to ten ERC-20 balances of one address in a single call, decimals resolved, amounts human-readable. Base mainnet. Query: ?address=0x…&tokens=0x…,0x…

Token price history in USD by CoinGecko id or chain:address: a 1-365 day time series with change %, high and low, or the price at an exact past date Token price history in USD for any coin by CoinGecko id or by chain:address: a time series over 1 to 365 days with change %, high and low, or the price at an…

Simulate a transaction before signing: runs `eth_estimateGas` for `{ to, from?, data?, value? }` and returns the estimated gas units and estimated fee (current gas price x gas, in wei + ETH). If the node rejects the call it returns `ok:false` with the decoded `revertReason` (why it would fail) instead of erroring. Reads live on-chain state with automatic endpoint fallback.

Returns live counts of tracked aircraft, active emergency squawks by type (hijack, radio failure, general emergency), and per-flight position data — monitor global airspace emergencies in real time.

Live ERC-20 spending allowance an owner has granted a spender: calls `allowance(owner, spender)` on the token and returns the raw amount, a decimal-formatted amount (using the token's decimals) with its symbol, and an `isUnlimited` flag for effectively-infinite approvals. Use it to audit token approvals / approval risk before signing. Reads live on-chain data with automatic endpoint fallback.

Every energy benchmark in one call: WTI and Brent crude oil spot, Henry Hub natural gas spot, and US regular retail gasoline — each with its latest price, prior reading, and change. The catalog's commodities feed (no equity/forex/crypto endpoint carries these). For one benchmark with history use /api/v1/energy/{product}. Source: U.S. Energy Information Administration (EIA). From x402stock

USD Coin

Trending DEX pools on Base: price, volume, liquidity

Live transaction receipt by hash via `eth_getTransactionReceipt`: success/failed status, block number, from/to, created contract address, gas used, cumulative gas, effective gas price (wei + gwei), tx type and the emitted event logs (capped). Complements `tx` (which reads the transaction itself). Returns `found:false` for unknown/pending hashes. Reads live on-chain data with automatic endpoint fallback.

Sentiment analysis for any topic, brand, coin or ticker. Aggregates web/news/blog citations and returns polarity counts (positive/negative/neutral), emotional connotations (anger, happiness, love, sadness, fun, share) and a derived sentiment score in [-1,1]. For crypto/market sentiment, brand monitoring and opinion-mining agents.

USD Coin

AI text generation via Claude. Prompt in, polished text out - drafting, rewriting, extraction and reasoning for agents. Pay per call with USDC (x402) or credits - archtools.dev

USD Coin

Compare 2 to 3 US-listed stocks side by side (peer or watchlist comparisons). Pass a comma-separated list via `?tickers=AAPL,MSFT,NVDA` (1 to 3 symbols). Returns price and day change, market cap, P/E, EPS, revenue, gross and net margins, and dividend yield per ticker. Built for multiple stocks — for a single stock, `/api/v1/quote/{ticker}` is cheaper. From x402stock

Polymarket BTC 15m Up/Down in one call: the OFFICIAL price to beat (the 60 s Chainlink TWAP before the window, matched to the cent against Polymarket's results), the live Chainlink price and its distance from the price to beat, seconds left, token ids and the market's own prices. ?start=<unix> returns a past window's official settle and outcome. $0.004 USDC. Data, not financial advice.

Deterministic syntax validation — does this JSON/YAML/TOML/Python/regex parse? Valid/invalid + error location from the canonical parser. For long source use POST. Free sample, no payment required: GET /play/syntax

Deterministic readability scores (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) over published formulas. For long text use POST. Signed.

Search prediction markets ACROSS PLATFORMS (Polymarket + Kalshi) in one call: live prices, implied probability, volume, liquidity, end date and market conviction. Server-side search that actually finds the market (bitcoin, fed, election, geopolitics). For trading and forecasting agents tracking event odds. $0.05 USDC x402 Base. Input: {"input": "bitcoin"} (optional filter). Ed25519-signed.

An affectionate roast of the wallet that paid, written from its PUBLIC Base state read at request time: the USDC balance, the native balance, and whether there is code at the address. Those become words — dust, pocket, purse, vault; gas or none; contract or plain — and a hand-written line is picked from them, keyed to your address and the UTC date, so it holds all day. EXACT AMOUNTS ARE NEVER RETURNED OR STORED. Chain unreadable, generic roast: you paid for one either way.

Official US Treasury reporting rates of exchange — government FX reference rates for ~170 currencies, in units of foreign currency per 1 USD, for the latest quarter. Use for accounting-grade and exotic-currency conversion the market /api/v1/forex feed lacks. Filter with `?currency=Euro`. Updated quarterly. From the US Treasury (FiscalData). From x402stock