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

• obagents.vercel.app Live x402

  x402 OB Image Generator · Price $0.01 per generated image https://obagents.vercel.app/api/obigen/protected/igen GET Query Params // The primary text description of the image to generate. prompt: string; Example: https:/…

  x402 paid API · 1 endpoint

• obeliskapp.io Live x402

  Search Obelisk's curated spy ad catalog when you need competitor creative examples by keyword, brand, or platform. Returns JSON ad cards. Use limit=1 for a cheap first call.

  x402 paid API · 1 endpoint

• obol.danieldutoit.net Live x402

  Base network block status reconciled after payment across two pre-probed distinct-operator RPC endpoints

  x402 paid API · 1 endpoint

• observer.137-184-67-179.sslip.io Live x402

  Live Bitcoin BTC-USD market-regime and risk evidence for autonomous AI agents, algorithmic systems, portfolio monitors, and quantitative workflows. Returns current market state and phase, coherence, commitment, pressure…

  x402 paid API · 1 endpoint

• oceanalt.com Live x402

  Deep taint trace: follow funds upstream over multiple hops to see whether they touched illicit sources. (4 paid endpoints on oceanalt.com.)

  x402 paid API · 4 endpoints

• offercheck.offercheck.workers.dev Live x402

  Read any public web page as clean Markdown: main-content extraction (navigation, footers, scripts and hidden elements removed), headings, lists, tables, code blocks, links (absolute, deduplicated), images, plus title, d…

  x402 paid API · 5 endpoints

• og.bip-rep.com Live x402

  Generate ready-to-use 1200x630 Open Graph / social preview images from text for content, marketing, and publishing agents. Provide a title plus optional subtitle and category badge, pick a built-in theme (dark, light, m…

  x402 paid API · 1 endpoint

• oi.lonestaroracle.xyz Live x402

  Full OI report — all assets, all exchanges, 5-min delta

  x402 paid API · 1 endpoint

• omardev.xyz Live x402

  Extract structured metadata from any URL: page title, meta description, Open Graph and Twitter Card tags, canonical URL, favicons, language, generator and robots directives, plus RSS/Atom feed links. Give it a URL, get…

  x402 paid API · 2 endpoints

• onvexia.com Live x402

  Topic ranking. Ranked social topics for a window. Returns topics + window_hours. (3 paid endpoints on onvexia.com.)

  x402 paid API · 3 endpoints

• openai.mm.family Live x402

  gpt-6.1-sol (OpenAI's newest model) and 25 more OpenAI chat models (gpt-6, gpt-5.x, gpt-4.1, gpt-4o, o-series), paid per call in USDC. OpenAI token rates on Flex (half price, may answer 429; default where offered), Stan…

  x402 paid API · 12 endpoints

• openwebninja-x402.vercel.app Live x402

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

  x402 paid API · 5 endpoints

• openworker.etips.me Live x402

  Returns a single, verifiable snapshot of any EVM wallet: native balance, ERC-20 token balances, current block number, and recent activity count across the most popular chains (Ethereum, Base, Arbitrum, Polygon). Built f…

  x402 paid API · 2 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

• pennyforge.org Live x402

  SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain} (2 paid endpoints on api.pennyforge.org.)

  x402 paid API · 2 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

Related capabilities

On-chain dataTrading & marketsAI models & inferenceMaps & travelAgent infrastructureResearchSecurity & 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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