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Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
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2,935 results- HHALOWERK quantumwerkAI & agents
Interpolates a caller-supplied start and end temperature across a bounded number of steps using either a linear or geometric rule. It does not run an annealer, optimize a problem Hamiltonian or tune a schedule from hardware measurements.
Basequantum.halowerk.comfrom $0.00210 endpoints - Aapi.govparse.ioData & research
How much open federal money is in the dataset right now? Headline aggregates: active SAM.gov contract opportunities (and how many still have an open deadline), Grants.gov opportunities by status (posted vs forecasted), and USAspending award records on file with their total dollar amount.
BaseSolanaapi.govparse.iofrom $0.0015 endpoints
x402 Video IntelligenceImages, audio & videoYouTube video transcript extraction with per-segment timing. Returns the caption track as timed segments (start, duration, text) plus the full plain text, or as SRT subtitles. Uses the creator's manual captions when they exist and falls back to YouTube automatic captions. Never downloads media, so it stays fast and light. Cached per video and language. Use it to summarize a talk, quote a video wit
Basevideo.cyberwarex.comfrom $0.0012 endpoints
U2ACrypto & DeFiFind the right Web3 product for trading, perps, quests, or bridging using queries such as “perp DEX”, “bridge ETH to Base”, “Galxe quests” or “Banana Gun”. Get the best-matching product, supported networks, user perks, official site and a partner link. Referral links disclosed.
Baseu2a.com.aufrom $0.0017 endpoints- Aapi.tcgapi.devOther services
TCGPlayer current prices for every card in a set — useful for set value tracking and sealed Pokemon / Magic / Yu-Gi-Oh product pricing.
BaseSolanaapi.tcgapi.devfrom $0.0057 endpoints - CCrypto Data AgentCrypto & DeFi
Top DeFi yield pools with APY/TVL, filterable by chain (DefiLlama).
BaseSolanax402-crypto-data.vercel.appfrom $0.0022 endpoints - Ttravel.brij.fiSearch & web
Flight search
Solanatravel.brij.fifrom $0.013 endpoints - Sshelf.thirdmade.netCrypto & DeFi
Current transaction nonce for any address on Base or Ethereum. Agent tx bots need this before sending transactions.
Baseshelf.thirdmade.netfrom $0.00120 endpoints - BBrazil Data APIMarkets & finance
Official USD/BRL and EUR/BRL exchange rates (PTAX, Central Bank of Brazil).
BaseSolanabrasil-dados-api.onrender.comfrom $0.0024 endpoints - Kkaisha-api.hp-vladic.workers.devOther services
Japanese business-day calculator: check if a date is a business day, add N business days to a date, or count business days in a range. Accounts for weekends and Japanese national holidays; optional Saturday and year-end/new-year rules.
BaseSolanakaisha-api.hp-vladic.workers.devfrom $0.0022 endpoints
FortiSwapCrypto & DeFiList every token FortiSwap routes on the X1 blockchain (XDEX + Degen launchpad): mint, symbol, name, decimals, logo, USD price, 24h volume, TVL, trust tier, liquidity, and the isSpam / isVerified / riskReasons safety flags. Call this first to resolve a symbol to a mint before quoting or building an X1 swap.
SolanaBaseapp.fortiblox.comfrom $0.0013 endpoints
Yield.xyz MCPCrypto & DeFiDiscover DeFi yield opportunities across 80+ networks — 3,300+ staking, lending, vault, and RWA yields from Lido, Aave, Morpho, and more. Filter by token, network, yield type, or provider and sort by APY or TVL. Returns yield IDs (needed by every other tool) with APY, TVL, lock-up/cooldown periods, and KYC gating. Start here.
BaseAvalanchemcp.yield.xyzfrom $0.00112 endpoints- Ccurrency-api-production-4a8d.up.railway.appCrypto & DeFi
Current price, market cap, and 24h change for a single cryptocurrency by symbol or name (CoinGecko).
Basecurrency-api-production-4a8d.up.railway.appfrom $0.0013 endpoints
Tanod utilpeekImages, audio & videoutilpeek (Tanod) file upload: PDF, Office, image, audio, CSV, JSON or text stored for up to 24 hours and returned as a download link. Use when an agent holds a file and must give the next tool a URL for it: a link that expires within 24 hours.
SolanaBasePolygon+2tanod.devfrom $0.0005279 endpoints- KKertivo ShieldCrypto & DeFi
Address-poisoning check before you send USDC on Base. Body {from, to} (or sender/recipient; chain=base, token=USDC only, others 400 not charged; optional contacts/known_addresses): scans the sender's recent Base USDC transfers for lookalikes (same first/last 4 hex) plus dust/zero-value transfers. No sender? {recipient, known_addresses} = offline contacts check; {address} alone scans its own histor
Basepaycheck.hectichustle.workers.devfrom $0.0015 endpoints - BBase Address InspectorCrypto & DeFi
Check a BNB Smart Chain wallet's ERC-20 approvals: allowances for 8 major tokens (USDT, USDC, WBNB, BUSD...) to common spenders (Permit2, PancakeSwap v2 Router, PancakeSwap Smart Router, PancakeSwap Universal Router...); flags unlimited approvals.
Baseautomaton-tx-explainer.vercel.appfrom $0.00542 endpoints - Xx402 Base ToolsCrypto & DeFi
Current Base gas: base fee, priority fee percentiles over the last 10 blocks, the L1 data fee of a typical transaction, and what an ETH transfer, an ERC-20 transfer, a USDC transferWithAuthorization (an x402 payment), a swap and an NFT mint cost now in ETH and USD (ETH/USD from Chainlink).
Basebase.kagurazaka.devfrom $0.0019 endpoints - Ttwitr.shSocial & people
Search X/Twitter tweets with the full operator set — keyword, exact phrase, from-user, language, date range, media type, minimum likes/retweets, verified-only — or search user profiles by keyword. Billed per tweet returned against your resultsLimit cap. Built for tracking what people say about a topic, brand, or ticker in real time.
BaseSolanatwitr.shfrom $0.00243 endpoints
Agent Extraction APIImages, audio & videoAgent tools search: One search across ~13,000 agent tools: 4,259 MCP servers (awesome-mcp-servers, MIT) and ~8,900 x402 pay-per-call APIs (nohumans.directory, CC BY 4.0). Filters: q, type=mcp|x402, limit<=100.
Basefreetier-agent-api.pages.devfrom $0.00163 endpoints- SSindriSocial & people
Live currency exchange rate API. Returns the current exchange rate between any two ISO 4217 currency codes (e.g. USD to EUR) — live external data an LLM cannot know on its own.
BaseSolanappu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.awsfrom $0.0151 endpoints - Ddefi-api.agenticfi.wtfSocial & people
Social volume - Twitter/Farcaster mention count for a token
Basedefi-api.agenticfi.wtffrom $0.00117 endpoints - Aagentx.saleData & research
Live current weather for any city (Open-Meteo)
BaseSolanaagentx.salefrom $0.0126 endpoints
NythosX Market DataCrypto & DeFiSignal bias with setup levels and invalidation. Rules-based bias (bullish/lean_bullish/neutral/lean_bearish/bearish) with score, confidence, setup, weighted factors, invalidation. tf sets candle size and lookback (5m=1H to 1w=1Y): shorter is faster but noisier, longer is slower but higher-conviction. Accuracy free at /api/v1/track-record. Quick direction + one setup; get_trade_plan ($0.03) adds ta
Base SepoliaBasemarket.nythosx.comfrom $0.0056 endpoints- Pproperty.payapi.marketOther services
UK HM Land Registry sold property prices by postcode.
Baseproperty.payapi.marketfrom $0.0018 endpoints - Aapi.run402.comOther services
Set prototype tier ($0.10 USDC) — auto-detects start/renew/upgrade
Base SepoliaBaseapi.run402.comfrom $0.012 endpoints
Ozmium Agent APISocial & peopleLive 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 use. Same feeds the human chart runs on; the cross-venue spread between them is real, tradeable divergence (lead/lag arbitrage). Covers Gains-listed symbols Coinbase lacks (e.g. Full
Baseozmium.orgfrom $0.0018 endpoints- Oot-intel-api.onrender.comOther services
Recurring public "State of OT Threat Intel — GCC" sitrep, human-reviewed before publish, sourced from the same intel.db pipeline as /ot/sitrep. Pass optional issue_date (YYYY-MM-DD) for a past edition; omit for the latest reviewed edition.
Baseot-intel-api.onrender.comfrom $0.017 endpoints - Ssandbox.node4all.comDeveloper tools
Node4All Fortune — deterministic fortune reading derived from the x402 payment authorization nonce. Flagship demo of the Node4All x402 v2 payment flow. Operator: Node4All (https://node4all.com). Currency: USDC on Base.
Base Sepoliasandbox.node4all.comfrom $0.0021 endpoint - CCrypto & Token PricesSocial & people
Crypto & token prices: live USD spot price for one or more coins/tokens by coin id — market coins (e.g. "coingecko:bitcoin", "coingecko:ethereum") or any ERC-20 by contract (e.g. "ethereum:0xdAC17..."). Real-time bitcoin, ethereum and token price feed from an open, redistribution-OK source. Unknown ids are returned in `notFound`.
Basecrypto.openverbs.comfrom $0.00119 endpoints - Xx402-seller-0ay3.onrender.comCrypto & DeFi
Top DeFi protocols ranked by TVL (total value locked), highest first, source DefiLlama. Optional parameter: ?limit=<n> (1 to 100, default 20).
Basex402-seller-0ay3.onrender.comfrom $0.00527 endpoints
Service data comes from the Coinbase CDP and PayAI discovery lists and refreshes every few hours. Usage is paid calls over the last 30 days. APIs launched here are verified by us; the rest are paid directly to their owners.