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

• asia.lonestaroracle.xyz Live x402

  Asia regional macro + geopolitical stress pulse (no params)

  x402 paid API · 1 endpoint

• asn-lookup.underscoredone.com Live x402

  Given an internet address (IP) or a network identification number (ASN), this tool returns who operates that piece of the internet: the network number, the owner's name, the country it's registered in, the regional regi…

  x402 paid API · 1 endpoint

• astro.openverbs.com Live x402

  Compute sunrise, sunset, solar noon and day length for a latitude/longitude (east-positive) and date, using the NOAA sunrise equation. All times are UTC ISO-8601. Locations in polar day or night return null rise/set wit…

  x402 paid API · 4 endpoints

• aubr.ai Live x402

  Send a question about longevity, aging, or lifespan science. Returns a request ID to poll for the AI-generated answer from Aubrai, VitaDAO's decentralized co-scientist.

  x402 paid API · 1 endpoint

• audio.halowerk.com Live x402

  Returns measured evidence about a recording, not a verdict on it. The spectral cut-off says which lossy stages the file has already been through, since every encoder discards everything above its own ceiling. The room t…

  x402 paid API · 1 endpoint

• audit-site-web.pga-agent.fr Live x402

  On-chain facts for any Base address: EOA or contract, first transaction and age, transaction count, ETH and USDC balances, top 10 tokens held with USD value when known, recent contracts created. Information, not investm…

  x402 paid API · 4 endpoints

• audit.liquidlogicx.com Live x402

  x402 spend cap and allowance check by Liquid Logic X: call it before paying an x402 endpoint. Input: wallet (the Liquid Logic X treasurer, 0xEA24...) and optional endpoint URL. Output: JSON { allowed, reason, remainingU…

  x402 paid API · 3 endpoints

• aurelianflo.com Live x402

  Exact-match OFAC wallet screening and crypto wallet sanctions check for sanctioned digital currency addresses. Screens one wallet address against Treasury's public SDN advanced XML and returns hit or clear status, asset…

  x402 paid API · 1 endpoint

• aurenic.org Live x402

  Total US public debt outstanding, to the penny, latest available (25 paid endpoints on api.aurenic.org.)

  x402 paid API · 12 endpoints

• ausca.com Live x402

  Start one renewable random receive-only temporary email address, then wait for and read bounded inbound mail. Use it as a disposable email or throwaway inbox for agent workflows, and extend the same active address when…

  x402 paid API · 6 endpoints

• automaton.72.62.51.224.sslip.io Live x402

  German gross-to-net monthly estimate: Lohnsteuer, Solidaritaetszuschlag, Kirchensteuer, social contributions (2 paid endpoints on automaton.72.62.51.224.sslip.io.)

  x402 paid API · 2 endpoints

• aventtech.com Live x402

  QR code generation returning clean scalable SVG: any text/URL up to 1800 chars, selectable error-correction level (L/M/Q/H). (21 paid endpoints on api.aventtech.com.)

  x402 paid API · 12 endpoints

• ax1-new.vercel.app Live x402

  Send a token contract address (Base by default, or Robinhood Chain), get an AI-written verdict: onchain metrics, a plain-language take, and a shareable verdict card. Payment is always x402 USDC on Base. Entertainment, n…

  x402 paid API · 1 endpoint

• ax1.vc Live x402

  Send a Base token contract address, get an AI-written verdict: onchain metrics, a plain-language take, and a shareable verdict card. Entertainment, not trading advice.

  x402 paid API · 1 endpoint

• Axiom Agentic Tools Live MCP

  x402-paid Base agent tools (USDC). 5 deterministic tools. No API keys. No NFT pass.

  MCP server · io.github.0xAxiom

• b702.everygoodwork.io Live x402

  a play of b702 — You can play it for the time you paid for. You don't own it — the creator still does.

  x402 paid API · 1 endpoint

• bakhour.ca Live x402

  Resolve ONE DNS record type for a domain -- the cheapest, narrowest domain-check endpoint. For all record types at once, use /domain/intelligence. For a bundled DNS+TLS+headers audit, use /web/audit (raw) or /security/p…

  x402 paid API · 1 endpoint

• balticdryindex.com Live x402

  BDI derived indicators (trend, momentum, volatility, regime)

  x402 paid API · 1 endpoint

• banking-compliance-production.up.railway.app Live x402

  Search the federal banking compliance rules database. 56 rules across Reg DD, Reg Z, UDAAP, ECOA, BSA/AML, and more.

  x402 paid API · 1 endpoint

• Baron Power Play Live MCP

  Pay-per-call AI infra for agents: DeFi market data, LLM inference, STT/TTS. x402 v2, USDC on Base.

  MCP server · io.github.MintMachineHQ

• base-gas-x402-production.up.railway.app Live x402

  Live Base mainnet gas: EIP-1559 base fee, low/medium/high priority tiers in gwei, and a transaction cost estimate for any gas limit. (3 paid endpoints on base-gas-x402-production.up.railway.app.)

  x402 paid API · 3 endpoints

• base-token-check.fly.dev Live x402

  Base ERC-20 check before an agent buys or holds a token. Input: one contract address. Output: allow, warn, or block. Block: not a contract, not an ERC-20, zero supply, or the owner or token contract holds at least 50 pe…

  x402 paid API · 3 endpoints

• base64encode.use.x402atlas.com Live x402

  Fetch any public URL and return its content as base64 with the content type and a ready-to-use data URI. Embed images, PDFs and files directly in LLM and API calls without downloading them yourself. Clean JSON.

  x402 paid API · 1 endpoint

• bazaar-catalog.vercel.app Live x402

  Convert Gregorian dates to Hijri (Umm al-Qura calendar) and back. Returns day/month/year, Arabic and English month names, and a formatted Arabic date string. Essential for agents handling Islamic events, Ramadan, Hajj s…

  x402 paid API · 2 endpoints

• bazaar.fronesislabs.com Live x402

  Low-latency pre-action screening for routine agent responses and tool-call decisions. (9 paid endpoints on bazaar.fronesislabs.com.)

  x402 paid API · 9 endpoints

• BerrerGate Tool & Provider Intelligence Live A2A

  Agent-first capability intelligence with free discovery, a wisdom-first paid Evidence Brief, low-cost no-web inference, and commercially cleared stack decisions. Payments use Base USDC via x402.

  A2A agent · Berrer · 12 skills

• billionaireorder.com Live x402

  For AI agents building agent swarms, synthetic users, NPCs, or trading bots. Input: archetype + prompt (e.g. 'risk-taking crypto founder'). Output: OCEAN Big Five + Dark Triad + trading psychology vector with emotional…

  x402 paid API · 6 endpoints

• billitright.co Live x402

  Password - CASA Cybersecurity Assessment - Consolidates evidence on secure communications, including certificate validity, hostname matching, protocol and cipher strength, forward secrecy, and TLS vulnerabilities. It de…

  x402 paid API · 1 endpoint

• bimi-checker.underscoredone.com Live x402

  Checks one or more domains to see whether they are set up to show a brand logo next to emails in Gmail, Apple Mail, and Yahoo. It looks up the BIMI settings the domain has published, checks the logo file follows the req…

  x402 paid API · 1 endpoint

• bio.halowerk.com Live x402

  Multiplies per-contact transmission probability, effective contacts per day and infectious duration to obtain a simple basic reproduction number, then applies a susceptible fraction for an effective number. It is a clas…

  x402 paid API · 10 endpoints

• biotechcatalystsentinel.com Live x402

  PDUFA dates a company put in an SEC filing, not a calendar of every US-listed biotech. Each date is grounded in a verbatim filing quote, cited to its EDGAR accession, and scored against the FDA decision. Use when you ne…

  x402 paid API · 2 endpoints

• bitcoind.app Live x402

  Complete list of all Bitcoin Core RPC methods (summaries). One call replaces up to 142 individual lookups. Returns name, category, summary, and parameter count for every method.

  x402 paid API · 1 endpoint

• bizintel-api.hahavoid0.workers.dev Live x402

  Queries foreign exchange currency pairings from the free Frankfurter database. (6 paid endpoints on bizintel-api.hahavoid0.workers.dev.)

  x402 paid API · 6 endpoints

• blackswan.wtf Live x402

  Precursor Detection - Catches risk signals before events materialize (2 paid endpoints on x402.blackswan.wtf.)

  x402 paid API · 2 endpoints

• blockchain-api.x402-chain-tools.workers.dev Live x402

  Check the latest or current Base Mainnet block number. Use this to get the live Base block height. (4 paid endpoints on blockchain-api.x402-chain-tools.workers.dev.)

  x402 paid API · 4 endpoints

• blockchain.info Live x402

  Paid AI-agent access to Blockchain.com Explorer API (55 paid endpoints on api.blockchain.info.)

  x402 paid API · 12 endpoints

• blockchainmoneymap.com Live x402

  Buyers need confidence that wallet, agent card, domain label, MCP server, seller profile, and x402 receiver belong together. (99 paid endpoints on api.blockchainmoneymap.com.)

  x402 paid API · 12 endpoints

• blockscout.com Live x402

  Access to api/v2/addresses/:address_hash. Retrieve detailed information about a specific address or contract (7 paid endpoints on api.blockscout.com.)

  x402 paid API · 7 endpoints

• booaip.vercel.app Live x402

  Top APY yield pools by token symbol and chain, with risk flags (DefiLlama). Body: { symbol?, chain?, limit?, safeOnly? }. (4 paid endpoints on booaip.vercel.app.)

  x402 paid API · 4 endpoints

• book-bot.app Live x402

  Search audiobookbay.lu for audiobooks. Returns up to ~12 result entries with slugs that can be passed to /api/audiobooks/details for magnet links.

  x402 paid API · 1 endpoint

• boonprotocol.com Live x402

  Boon x402 endpoint recognition graph (2 paid endpoints on api.boonprotocol.com.)

  x402 paid API · 2 endpoints

• BorderScout Live A2A

  Machine-payable US border-crossing queries over x402. Ranks the 85 US ports of entry by ALL-IN time — the drive there plus the wait once there — per lane type, for passenger, commercial or pedestrian traffic. The neares…

  A2A agent · BorderScout · 3 skills

• BotCurve Base Live A2A

  Machine-purchasable Base market intelligence and unsigned BOTC execution packets for autonomous agents. Uses x402 v2 USDC payments and never signs or submits transactions for the caller.

  A2A agent · BotCurve · 2 skills

• brasil-dados-api.onrender.com Live x402

  Official USD/BRL and EUR/BRL exchange rates (PTAX, Central Bank of Brazil). (3 paid endpoints on brasil-dados-api.onrender.com.)

  x402 paid API · 3 endpoints

• brazilayer.com Live x402

  Daily fire hotspots across Brazil from the official INPE satellite program: count and mean intensity (FRP) by biome (Amazon, Cerrado, etc.) over the last 7 days, leading states, plus mean days-without-rain at fire locat…

  x402 paid API · 12 endpoints

• broke2built Data & Intelligence Skills Live A2A

  Working data skills for other agents: email/domain/DNS intelligence, web-page audit (SEO, security headers, broken links, metadata), content extraction (readability, RSS→JSON, HTML tables), and EVM on-chain reads. Free…

  A2A agent · broke2built · 12 skills

• brokenkey-api-link-ruby.vercel.app Live x402

  Purchase and download the Broken Key Remapper software (one-time license).

  x402 paid API · 1 endpoint

• brokenkey-api-link-tau.vercel.app Live x402

  Purchase and download the Broken Key Remapper software (one-time license).

  x402 paid API · 1 endpoint

Related capabilities

On-chain dataTrading & marketsResearchAI models & inferenceAgent infrastructureWeb scrapingMaps & travelEmail

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.

Run one of these? List it free or claim its listing for uptime monitoring and a badge.