x402 paid APIs: MCP servers, A2A agents and x402 APIs

• openwebninja-x402.vercel.app Live x402

  Fetch current Amazon deals. (5 paid endpoints on openwebninja-x402.vercel.app.)

  x402 paid API · 5 endpoints

• options.lonestaroracle.xyz Live x402

  Options flow intelligence — unusual activity put/call ratios large block trades

  x402 paid API · 1 endpoint

• oracleinsight.xyz Live x402

  Pre-trade safety check: oracle-immune-system verdict for one trade, with verifiable EIP-712 attestation support. BLOCK verdicts are complete checks and are charged.

  x402 paid API · 1 endpoint

• oraclepost.higgsfield.app Live x402

  Current gas conditions on Base, read live from a public node: gas price, base fee of the latest block, suggested priority fee, latest block number and timestamp. No parameters. No third-party API, no cache. (32 paid end…

  x402 paid API · 12 endpoints

• oracles-production.up.railway.app Live x402

  Full stored detail for a single crypto & digital assets rule by Federal Register document ID (e.g. 'fedreg:2026-14090') — title, issuing agency, rule type, effective date, and 1-10 compliance-impact score. Covers digita…

  x402 paid API · 5 endpoints

• orcatrace.dev Live x402

  Paid ($0.01 USDC via x402). Most recent Polymarket feed item — mover, whale entry (with calibration), or predetermined signal. Same shape as /v1/signal without ?index. Free index poll: GET /v1/index; free shape preview:…

  x402 paid API · 3 endpoints

• orchard-data.letom1176.workers.dev Live x402

  Crypto fear & greed index (current + previous reading). JSON. (4 paid endpoints on orchard-data.letom1176.workers.dev.)

  x402 paid API · 4 endpoints

• orchard-data.netlify.app Live x402

  Macro dashboard in one call: 13w/5y/10y/30y Treasury yields, dollar index, gold, WTI crude, VIX. JSON. (5 paid endpoints on orchard-data.netlify.app.)

  x402 paid API · 5 endpoints

• outcomescout.vercel.app Live x402

  Turn a news headline into the matching Polymarket prediction markets to trade. One call returns the top markets ranked by relevance, each with live odds/implied probability, 24h drift, spread, on-book liquidity, volume,…

  x402 paid API · 1 endpoint

• overwing.ai Live x402

  Overwing guardrail: check text before you send, post, or act on it. Content moderation, PII detection, confidential leak detection, toxicity, self-harm and severity in ~150 ms. Returns a verdict plus one recommended_act…

  x402 paid API · 3 endpoints

• oyapicks.app Live x402

  OyaPicks: recently resolved prediction markets and their winning outcome (2 paid endpoints on oyapicks.app.)

  x402 paid API · 2 endpoints

• ozmium.org Live x402

  Live prices from TWO labeled venues per symbol: Coinbase exchange spot (+ 24h stats) AND the gTrade venue leg { gains: { pairIndex, mark, index } } — mark is what fills on Gains, index is the oracle spot liquidations us…

  x402 paid API · 9 endpoints

• paket.halowerk.com Live x402

  Takes a file digest and answers which released package version it is. Useful for an artefact found in a container layer, a build directory or an attachment with no metadata attached. Hex and base64 input are both accept…

  x402 paid API · 2 endpoints

• parallax402.com Live x402

  The funnel, honestly, for one seller over the indexed window: settled USDC and purchases, distinct buyers, organic share after self-test exclusion, recurring buyers, buyer half-life and the facilitator mix. (2 paid endp…

  x402 paid API · 2 endpoints

• particle.pro Live x402

  Search entities. Find a person, company, or knowledge graph entity by free-text query — a name, partial name, nickname, stock ticker, @handle, or website domain. (19 paid endpoints on api.particle.pro.)

  x402 paid API · 12 endpoints

• password.openverbs.com Live x402

  Generate a secure random password (characters) or a wordlist passphrase. (2 paid endpoints on password.openverbs.com.)

  x402 paid API · 2 endpoints

• pathmint.edge.report Live x402

  BEFORE YOU PAY an x402 402: ping this resource URL. Returns live or dead (ghost listing, timeout, non-compliant host). One cent. Use when holding Payment-Required, before sending USDC to a payTo. Ghost x402, is this end…

  x402 paid API · 2 endpoints

• paylog.dev Live x402

  8 Things That Tripped Me Up Implementing x402

  x402 paid API · 1 endpoint

• payperbyte.io Live x402

  USGS recent earthquakes worldwide (M2.5+) (2 paid endpoints on x402.payperbyte.io.)

  x402 paid API · 2 endpoints

• penny-army-reference-mainnet.spruceboundgranitestudio.workers.dev Live x402

  Inventory supplied robots.txt groups, literal rule strings and sitemap declarations; no fetching or permission evaluation. (4 paid endpoints on penny-army-reference-mainnet.spruceboundgranitestudio.workers.dev.)

  x402 paid API · 4 endpoints

• pennypress.org Live x402

  A fragment about the paved frontier. (24 paid endpoints on www.pennypress.org.)

  x402 paid API · 12 endpoints

• pennyregwatch.com Live x402

  Check robots.txt before crawling or scraping a page. Decide whether GPTBot, ClaudeBot, Googlebot, or another crawler may fetch the exact URL and return ALLOW/DENY, winning rule, crawl-delay, sitemap URLs, and live prove…

  x402 paid API · 7 endpoints

• percallapi.com Live x402

  Lookup WHOIS records and domain availability in JSON format. Provide the domain name via ?domain=example.com to query registrar, status, and expiration dates. (5 paid endpoints on percallapi.com.)

  x402 paid API · 5 endpoints

• perpsignals.use.x402atlas.com Live x402

  Crypto Fear & Greed index — the current market-sentiment score (0-100) and its label (Extreme Fear … Extreme Greed), as a clean snake_case envelope. (3 paid endpoints on perpsignals.use.x402atlas.com.)

  x402 paid API · 3 endpoints

• peru-macro.use.x402atlas.com Live x402

  Latest Metropolitan Lima, Peru consumer price index (CPI) inflation from INEI via BCRP: monthly percentage change for inflation and purchasing-power analysis, not national CPI or an index level. (2 paid endpoints on per…

  x402 paid API · 2 endpoints

• phoneagent.xyz Live x402

  PhoneAgent — countries with rentable SMS phone numbers for AI agents. Returns 190+ supported countries, each with the number of services offered and the cheapest price tier ($1, $2, or $5 USDC). Add ?service=<alias> (e.…

  x402 paid API · 2 endpoints

• phone.openverbs.com Live x402

  Parse, validate and format a phone number — E.164/national/international/RFC 3966, region and line type (syntactic validation, no carrier lookup).

  x402 paid API · 1 endpoint

• physics.openverbs.com Live x402

  List every physical constant in the dataset, or only those in a given category (universal, adopted, electromagnetic, atomic, physico-chemical). Returns the constants, the total count and the set of available categories.…

  x402 paid API · 3 endpoints

• pixels.gateway.clawca.sh Live x402

  Inspect a public HTTPS URL for redirects, metadata, content type, word count, and content hash.

  x402 paid API · 1 endpoint

• places.openverbs.com Live x402

  Search Google's local business directory within a radius of a coordinate, filtered by category and/or a name query. Returns ranked businesses with name, category, star rating and review count, address, phone, website do…

  x402 paid API · 2 endpoints

• places.use.x402atlas.com Live x402

  Google Maps local business search — find places by query and map location (coordinates viewport), returning ratings, reviews, address, phone, website, hours & service options as clean JSON. (6 paid endpoints on places.u…

  x402 paid API · 6 endpoints

• poketpoker.com Live x402

  Deal one hand of Texas Hold'em against PoketPoker's bots and find out how your play compares. Five difficulty tiers; the top tier plays range-aware expected-value poker and beats every tier below it. Returns the table a…

  x402 paid API · 5 endpoints

• polymarket-signal-api.pwnker-polymarket-signals.workers.dev Live x402

  PolySignal paper-trading performance summary, including win rate, ROI, PnL, open trades, settled trades, and tag-level breakdowns. (2 paid endpoints on polymarket-signal-api.pwnker-polymarket-signals.workers.dev.)

  x402 paid API · 2 endpoints

• polymarketeer.vercel.app Live x402

  Get detailed information for a specific Kalshi event by ticker symbol

  x402 paid API · 1 endpoint

• polynews.news Live x402

  Real-time trade stream with market summaries (2hr rolling window, $500+ trades) (3 paid endpoints on polynews.news.)

  x402 paid API · 3 endpoints

• poolproof.ru Live x402

  Yield pool safety: peg of every underlying asset, yield sustainability, emission dependence, exit depth (9 paid endpoints on poolproof.ru.)

  x402 paid API · 9 endpoints

• Popdot AI Live MCP

  Rent verified subdomains by the hour, day, or month. Free 24h trials, x402 USDC on Base.

  MCP server · ai.popdot

• port-scanner.underscoredone.com Live x402

  Give this API a hostname or IP address and it tries connecting to each port in your requested range. For every port that answers it reports whether it is open or blocked, which service is likely running there (a web ser…

  x402 paid API · 1 endpoint

• postal.openverbs.com Live x402

  List every ISO 3166-1 alpha-2 country code for which a postal-code pattern is available. (4 paid endpoints on postal.openverbs.com.)

  x402 paid API · 4 endpoints

• postcode-api-production.up.railway.app Live x402

  Look up a UK postcode: coordinates, country, region, council, ward, parish, parliamentary constituency, and ONS/NHS area codes. (5 paid endpoints on postcode-api-production.up.railway.app.)

  x402 paid API · 5 endpoints

• posttosource.com Live x402

  Convert a Twitter/X, LinkedIn, Medium, Substack, Beehiiv, or public Notion page URL into clean markdown.

  x402 paid API · 1 endpoint

• ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws Live x402

  Email validation API. Checks whether a string is a syntactically valid email address using the same production-grade validation library trusted across the Node.js ecosystem, catching edge cases a quick regex misses. Ret…

  x402 paid API · 12 endpoints

• predictionmarketdata.io Live x402

  Recent news relevant to prediction markets within a publish-date window. (8 paid endpoints on api.predictionmarketdata.io.)

  x402 paid API · 8 endpoints

• preflight.openverbs.com Live x402

  Fetch any URL and, without paying, decode its x402 402 Payment Required challenge: price (atomic and formatted for known stablecoins), asset, network, payTo, resource, description, timeout and any input schema. Flags MP…

  x402 paid API · 1 endpoint

• premiumpin.com Live x402

  PremiumPin closed-catalog property search (3 paid endpoints on api.premiumpin.com.)

  x402 paid API · 3 endpoints

• preppers-paradise.com Live x402

  Paid book chapter (x402): Automate the Boring Stuff with Python: What Is Programming. Unit of a larger practical-skills library; free catalog at /library/discovery.json. Book slug: automatetheboringstuffwithpythonnew. R…

  x402 paid API · 1 endpoint

• prereason.com Live x402

  What changed since your last read: one page of PreReason's change events after a cursor. A briefing's state label, a tracked release, and, for the companies you name (?companies=, at most 200), newer figures, a situatio…

  x402 paid API · 12 endpoints

• problocks.io Live x402

  Verify payment connectivity with USDC on Base. Returns a JSON pong and UTC timestamp after settlement.

  x402 paid API · 1 endpoint

Related capabilities

On-chain dataTrading & marketsAI models & inferenceMaps & travelResearchAgent infrastructureSecurity & trustCrypto market data

How to use one

MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.

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