Every agent-payable API.

What does the full FMCSA carrier census look like, carrier by carrier, with authority and safety context attached? Bulk analytics feed in USDOT order: legal/DBA name, operating status, authority statuses on file, active insurance filings, safety rating, SaferGrade score, 24-month SMS inspection/out-of-service/crash summaries, fleet size, and address — flat rows, cursor-paginated up to 1000/page, filterable by state, minimum fleet size, or census add date.

How big is the FMCSA carrier dataset right now? Headline aggregates: total and active registered carriers, how many have a SaferGrade score and the grade distribution, carriers with inspection/crash history, and the current national driver/vehicle out-of-service baseline rates.

DeFi liquidation cascade risk — Morpho Blue health factors and cascade exposure

Cash cost to buy a target share count at price. Call when pre-trade cash check for prediction-market size targets. Returns total cost as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Scored, classified catalyst events with direction, 8-factor score, and provenance.

Category-first view of the x402swag.com storefront: apparel, drinkware, stickers, crew-necks, and v-necks, each with its items and price ranges, plus the store's real purchase flow (free browse/checkout, dynamic x402/card settlement, or the store's $0.05 one-call shortcut). Optional category filter.

Ceil a number to integer. Call when you need minimum whole buckets or page counts. Returns ceiled integer value for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Cell 001 deterministic media geometry engine

Public Celo Sepolia soak/proof and x402 commerce JSON bundle settled in Base USDC. Use when an agent needs verifiable Celo-rail evidence packaged for buyers.

[SIGNAL+PROOF] Census record for one MCP server (?name=): status, missing_streak, lifecycle, record_hash. DEGRADED DELIVERY, see unavailable_fields - prominence, maturity, github_stars, downloads and source_code_url have no data because the original collector stopped. Snapshot 2026-07-08. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

[SIGNAL+PROOF] Census record for one stablecoin (?symbol=): market cap, price, depeg state, lifecycle and time series, each with record_hash. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

Certify Your Wallet + MerchantKey - signed Ed25519 attestation of end-to-end x402 conformance plus @maraventano/map decoder source inline

CFR legal text — Fetch current Code of Federal Regulations text for a citation.

CFTC Commitments of Traders — weekly disaggregated futures positioning by commodity: managed-money long/short/net, producer-merchant, swap-dealer, and open interest. 20-year history, cleaned and canonicalized from the CFTC feed. Filter by metal (gold/silver/copper/platinum).

Chainlink Oracle Price

Which South African reference series changed or were reconfirmed since a given date. The cheap cache-freshness check for agents. Optional param: since=YYYY-MM-DD (defaults to the last 30 days).

Analyze a Tako Knowledge Card and get AI-generated insights. Returns plain-text observations about trends, growth rates, comparisons, and anomalies in the data. Use this after Knowledge Search to extract key takeaways from a chart. Requires a card_id from a previous Knowledge Search or Create Card response.

Render a bar/line/area chart to SVG (v2 discovery probe)

AI-powered chat and reasoning using DeepSeek V4-Flash — ask questions, analyze data, and generate content at just $0.001 per request 💎【付款后立得】实时结构化JSON，即插即用——无需注册，USDC一键支付即取数据。

LLM completion per call, no account and no API key: POST a prompt (or a messages array) and get the model answer as JSON. Hard caps disclosed in every response (8k chars in, 1k tokens out on this tier). Fixed price per call, signed receipt included so the answer stays auditable. Larger tier at /x402/chat-plus.

LLM completion per call on a stronger model, no account needed: POST a prompt or messages array, get the answer as JSON. 16k chars in, 2k tokens out, fixed price per call, hard caps disclosed in every response, signed receipt included. Smaller and cheaper tier at /x402/chat.

Cheap relevance check: title, description, canonical URL, language and an estimated token size — no full extraction.

Cheapest-model query: returns the lowest-cost AI models matching your constraints — min_context (tokens), vision/function_calling/reasoning (true), max_input_per_mtok (USD cap), limit (default 5). Add expected_input/expected_output token counts to rank by blended USD per request instead of input price; exclude_preview=true skips pre-release models. Answers 'what is the cheapest model that can do X?' across 2,000+ models and 70+ providers.

Check a URL before fetching it: is it alive, final URL after redirects, HTTP status, content type, HTML title, and whether robots.txt allows your user-agent. Link checker and fetch preflight for agents.

Check marketing or training content against 56 federal banking compliance rules. Returns violations with regulatory citations.

Fuzzy name match against the UK Sanctions List (OFSI): individuals and entities under UK financial sanctions regimes. Source: gov.uk, Open Government Licence v3.0 (Crown copyright, commercial use permitted). No crypto-address field exists in the underlying data, so unlike sanctions.ofac.check this is name-only. Factual screening data; not legal or compliance advice.

Is this crypto entity MiCA-authorised in the EU/EEA, in which register, with what status? Query params: name (string) OR lei (20-character LEI). JSON: match_confidence (exact|strong|weak|none), authorised (boolean), flagged_noncompliant (boolean), matches[] with register, legal_name, lei, home_member_state, competent_authority, status, services[], authorisation_date. Data source: ESMA Interim MiCA Register, official EU data; refreshed daily from weekly ESMA publications.

Checks a website imprint (Impressum, legal notice) in caller-supplied HTML against the eight groups of mandatory disclosures in § 5 DDG, the German imprint statute: name/address/representation, contact incl. e-mail, supervisory authority, commercial register, professional details, VAT ID, wind-up, audiovisual services. Conditional duties the HTML cannot decide come back as unknown, never as a defect. Finding with citation, not legal advice.

Cheap polling for a crypto opportunity you already retrieved: send signal_id plus the known_version you hold and receive whether it changed, the current version, live status (ACTIVE/STALE/INVALIDATED), which change types occurred (score, classification, entry zone, economics, execution blockers, status) and next_check_after — no full signal payload. Built for monitoring an active opportunity over time. Market intelligence only: no execution, no custody, no position sizing. Paid per request.

Checks a German invoice (Rechnung) for the ten mandatory details of § 14 (4) UStG, the German VAT act, from caller-supplied invoice text. If a total up to 250 EUR is detectable, the small-amount simplifications (Kleinbetragsrechnung, § 33 UStDV) apply and dispensable details come back as not_applicable, not as a defect. Also states whether a structured e-invoice format (XRechnung/CII, UBL, ZUGFeRD) is present: a format finding only, no claim about any duty or deadline. No tax advice.

Evaluate whether a statistical claim is supported and properly framed by its cited source

Check whether API keys or tokens tied to a domain — used by non-human identities like AI agents, service accounts, or CI/CD — appear exposed in criminal stealer logs. Call to audit whether the credentials an autonomous agent relies on have already been compromised upstream.

Check a JSON payload against a bounded structural contract and return path-level errors. Use it before an autonomous workflow acts on untrusted input, changes an API, retries a request, or evaluates production reliability. Returns bounded machine-readable JSON for $0.002 USDC via x402 on Base. Execution is deterministic, first-party, local-only, stateless, and does not call an upstream provider; structured validation failures are not billed.

Check a caller-supplied Base gas price and gas limit against an ETH transaction budget with exact Wei arithmetic. Use immediately after get_base_gas or get_base_estimate_gas to fail closed before signing. Returns estimated fee, budget headroom, and an optional USD estimate for 0.001 USDC via x402 on Base; no live RPC or custody.

Check a redirect target against an exact hostname allowlist. Use it as a bounded preflight or analysis step inside an enterprise agent workflow before data, policy, integration, security, or commercial decisions reach production. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, memory-only, and has no paid upstream or input retention. Results are advisory; the caller remains responsible for authorization and productio…

Check backlinks for a domain via CommonCrawl and Google search. Returns linking domains, anchor text, dofollow/nofollow counts.

Check empty object from value. Call when you detect empty JSON bodies in agent pipelines. Returns empty boolean for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Check if a Base address is a contract and return bytecode size for $0.001 USDC via eth_getCode. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the supplied input or one bounded public endpoint at request time; callers must verify before acting.

Check if a YYYY-MM-DD is in a static US market holiday set. Call when scheduling around known US market holidays offline. Returns is_holiday and name if known as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Check if a smart contract's source code is verified on Etherscan. Returns compiler version, license type, proxy status, and contract name. Unverified contracts are a red flag for token safety. Supports 60+ EVM chains.

Check if a specific date is a business day in a given country. Accounts for weekends and public holidays. Also returns the next business day if the given date is not one.

Check tests, rollback, observability, ownership, and security review before deploy. Use it as a bounded preflight or analysis step inside an enterprise agent workflow before data, policy, integration, security, or commercial decisions reach production. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, memory-only, and has no paid upstream or input retention. Results are advisory; the caller remains responsible for auth…

Check the status and availability of a domain.

Check whether a string is a float. Call when you validate decimal form fields before parse. Returns valid boolean for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Check whether a string is a signed integer. Call when you validate numeric form fields before parse. Returns valid boolean for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Check whether a value sits in [min,max]. Call when you preflight budgets, scores, or clamp decisions. Returns boolean in_range with bounds for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Check whether an IP is inside a CIDR network for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the supplied input or one bounded public endpoint at request time; callers must verify before acting.

Check whether an address already matches its EIP-55 checksum form — call when verifying an address already matches EIP-55 form. Use for chain input hygiene without live RPC—adjacent to OneSource-class small chain reads, but static/local only so rights and margin stay clear. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, and no claim of live chain tip, web se…

Check whether an architecture decision record contains accountable essentials. Use it as a bounded preflight or analysis step inside an enterprise agent workflow before data, policy, integration, security, or commercial decisions reach production. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, memory-only, and has no paid upstream or input retention. Results are advisory; the caller remains responsible for authoriza…

Check whether an object has a key. Call when you preflight required fields before paid calls. Returns has boolean and key for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.