ENS resolve on Ethereum: a .eth name to its address (?name=vitalik.eth), or an address to its primary ENS name (?address=0x...), forward-verified so a reverse record pointing elsewhere is never returned as the name.

Forward + reverse ENS resolution on Ethereum mainnet: turn vitalik.eth into an address, or an address into its primary ENS name. Complements the Basename resolver for Base.

Verify email validity. 🆓 5 free trial calls per signed wallet

Last N blocks base fee + priority fee. 🆓 5 free trial calls per signed wallet

Crypto market sentiment: Fear-and-Greed index (0-100) with classification from alternative.me.

The touch for one Polymarket outcome token: best bid, best ask, midpoint, spread in absolute and relative terms, and whether the book is one-sided. Use x402-poly-clob when you need the full book rather than the top of it.

HTTP header analysis. 🆓 5 free trial calls per signed wallet

Check whether a value is a float (has a fractional part). Provide value; returns true for non-integer numbers.

Perpetual funding rates. 🆓 5 free trial calls per signed wallet

Markdown to text or HTML. 🆓 5 free trial calls per signed wallet

Extract keywords from text. 🆓 5 free trial calls per signed wallet

Combined domain check: SSL cert validity (issuer, expiry, days remaining) + HTTP headers. Two checks, one call. $0.005/call, 5 free trials.

A, AAAA, MX, TXT, NS, CNAME. 🆓 5 free trial calls per signed wallet

Search Hacker News and Lemmy posts by query, sort and time window, merged, with score, comments, permalink and excerpt. Community search across Hacker News and Lemmy in one call, no key: posts by query, sorted by relevance, new or top, over a time window, with score…

Purpose-bound WordPress observation (cms) using the existing fresh Stack-Monitor. Returns stack_wordpress_decision, direct versus inferred status, evidence, optional version difference against a caller-owned baseline and reusable snapshot. Missing fingerprints do not prove absence. No background scheduling, CVE, compatibility or installed-extension inventory. Existing outbound safeguards remain in the injected motor. One public HTTPS root domain, up to150 baseline technologies; 9s timeout.

Resolve a ticker or CIK to a US company's registered identity. Profile of a US public company from SEC EDGAR: legal name, central index key, ticker symbols, exchange listings, standard industrial classification, business address and filer status. The authoritative regulatory record rather than an aggregator's copy. For agents resolving a company name to its regulatory identity before pulling financials or filings.

Decode ABI-encoded calldata into human-readable arguments.

Calculate the binomial coefficient C(n,k) — the number of ways to choose k items from n. Provide n and k (both >=0).

Country by ISO code. 🆓 5 free trial calls per signed wallet

Give an objective and a budget; get a verified result assemb…