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Read-only Base ERC-20 risk heuristics (honeypot/tax/liquidity/ownership). Data only, not advice. Free public Base RPCs. No charge on empty/failed. Port of amp token-risk.

TLS handshake for host[:port]; notBefore/notAfter, SANs, issuer, serial, days-left. Fail closed.

TEXT-IN ONLY sentiment trajectory: per-item score, inflection points, drift magnitude + model version. Not a trading signal. No scrape / no X. OpenRouter free-first.

npm SemVer + PEP 440 range checks; optional latest from npm/PyPI public JSON.

Recursively sort object keys; return canonical compact JSON. Offline. Amp port.

IP/CIDR intel via RIR RDAP + DB-IP Lite country (CC BY 4.0). No MaxMind.

Hacker News stories via Firebase API (keyless). Mode top|new|best (limit≤20) or item id.

Distance/bearing/midpoint/geohash/point-in-polygon. Pure math — NO geocoding.

ECB FX history via Frankfurter (keyless). from/to + start/end (or single date) → rates series. Data only — not advice.

Convert strings between camel/snake/kebab/Pascal/CONSTANT/Title (batch ≤50). Offline native.

Check whether email addresses are real and safe to send to. Verifies up to 25 addresses per call: syntax, domain MX/A record (including null-MX), disposable-domain, role-account, free-provider and typo checks. Does not perform SMTP/mailbox verification.

Detect whether an arbitrage opportunity exists in a set of token exchange rates (multi-pool negative-cycle scan). Cheap boolean + magnitude signal for trading agents. POST a swap-rate graph, get back whether a profitable cycle exists and how large — without the path.

Before your agent negotiates or shares data with another agent, make both prove they qualify. Open a channel with on-chain conditions (a USDC balance, a governance token, a verified attestation). Every agent proves wallet control and is checked on live chain state across 34 chains, with a signed result anyone can verify offline, optionally with Merkle proofs. Re-check on demand; whoever stops qual

Entry to the Secret Chat for the Chosen for 24 hours

Generate scannable QR codes from any text, URL, or structured payload (WiFi, vCard, SMS, email, geo, crypto). Returns PNG by default with JPG, WebP, and SVG output, plus optional error-correction, sizing, color, version, and encoding controls. Simple cURL POST: send qr_data, receive an image.

Render any public URL in a real browser (Chromium): markdown text plus screenshot and evidence URLs. $0.005 USDC on Base per call.

8 Things That Tripped Me Up Implementing x402

Ratatouille demo hello world: returns a greeting and a timestamp.

Check an unsigned Base mainnet transaction before signing or broadcasting. Simulates with eth_call, estimates gas, checks sender balance and target bytecode, decodes supported token transfers and approvals, flags unlimited approvals and suspicious transaction shapes, and returns PASS, REVIEW, or FAIL. Never signs or broadcasts.

Check whether a company is still operating: active, suspended or closed registration status plus tax type, looked up by business registration number. Live Korean National Tax Service (NTS) data.

Structured evaluation with TypeSafe's Jev (System One) model. Send any state plus typed questions — noul (true/false), choice (pick one), or score (ordinal scale) — and get back calibrated probabilities and confidence for each. Built for routing, classification, triage and policy checks where a fast, predictable, machine-readable answer beats prose.

Monitor recent official Israeli company-registry changes for an exact nine-digit company number. Returns filing and status-change events newest first, with dates, deterministic categories, source URLs, and checked_at. Use for counterparty monitoring, supplier due diligence, onboarding refreshes, corporate-event alerts, and registry change detection. Coverage is approximately one year.

List a country's holidays for a calendar year (optionally by state/region, language and type).

One DNS Doctor bulk scan of 2-50 domains in a single call, priced per domain.

Use before paying an x402 endpoint you have not used before, when you cannot tell a working seller from a trap, a testnet address dressed as mainnet, or a listing whose price no longer matches its challenge. Returns a verdict — live, degraded, trap, testnet or dead — a 0-100 risk score, and the specific findings behind both, so an agent can decline a bad endpoint instead of learning about it by lo

dappgrade score — front-end integrity verdict for an onchain app, looked up by contract address. Inspects the app's public web front-end, not contract bytecode or admin control. Returns ok / caution / avoid / unknown with the coverage the verdict rests on.

cron402: create a cron job that calls your webhook on a schedule. $0.008 includes 1 run credit; each subsequent run costs 1 credit (top up at /v1/crons/topup/{pack}).

URL-to-Markdown web extraction and context compression for AI agents. Fetch a public web page and return clean, task-relevant, citation-verifiable LLM context with exact excerpts, locators, hashes, and estimated tokens saved. Use before an agent summarizes, answers questions from, or cites a long or noisy URL. Deterministic and model-free. Public HTML only; no PDFs, logins, or JavaScript-only page

Perform the chant: 'All hail the Magic Conch!' The club responds: 'Hooray for the magic conches!' That is all this does, and it is enough.

Token flow check: every ERC-20 Transfer of one token into and out of an address (a vault, treasury, fee receiver or wallet) since block N, with totals, net, top counterparties, the largest transfers and the balance now. Use it to check claims like 'x% of every trade lands in the vault'. Ethereum, Base and Robinhood Chain. Independent, by Blockpin; not a Claus Network service.