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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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4,150 results- LList unitsDeveloper tools
List the supported units and their metadata (abbreviation, measure, system, singular/plural names), optionally filtered to a single measure — a discovery endpoint for choosing valid `from`/`to` values.
Baseunit.openverbs.comfrom $0.0022 endpoints - Uuk-cm-kg.aiAI & agents
One paid call on uk-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://uk-cm-kg.ai/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.
Baseuk-cm-kg.aifrom $0.011 endpoint - Ttopic-scorerOther services
Pass/fail check: does the text rank within the top `min_rank` categories of its target taxonomy? Returns `pass`, the target's rank and gap to #1, the taxonomy's top five, and the unused phrases to work in. Use it as a content-pipeline gate. Paid, $0.05/call; read-only and safe to retry.
Basetopic-scorer.pixelcove.cofrom $0.052 endpoints - TTools APICrypto & DeFi
Lightweight utility API for agents and operators: DNS lookups, RDAP/WHOIS domain data, HTTP probes, page metadata extraction, cryptographic hashing, JSON validation, scheduled webhooks, and exotic endpoints (Base transaction decode, ENS resolve, USGS earthquakes, cron next-run, TLS certificate report). No shell access; outbound URL tools enforce SSRF protections.
Basetools.bip-rep.comfrom $0.011 endpoint - PPrompt DemonImages, audio & video
Web page to clean text, title, links and metadata
Basestore.promptdemon.appfrom $0.012 endpoints - SStatEdgeOther services
StatEdge ATS records — historical against-the-spread trends for specific situations and teams
BaseSolanaPolygon+8stateedge.theaslangroupllc.comfrom $0.084 endpoints - Sstaking.halowerk.comCrypto & DeFi
Borrow-Curve Stress Test analyses only the evidence supplied by the caller. It does not claim to query a chain, identify a legal status or replace an independent audit. Missing signals lower confidence and are listed explicitly; every classification includes the exact thresholds used.
Basestaking.halowerk.comfrom $0.0012 endpoints - Sstable-supabase-git-ben-test-agentcash-rou-586785-merit-systems.vercel.appCrypto & DeFi
List all Stablebase projects owned by the calling wallet.
Basestable-supabase-git-ben-test-agentcash-rou-586785-merit-systems.vercel.appfrom $0.011 endpoint - Ssource-claim-proof.mattskowronis.workers.devSearch & web
Verify whether a supplied public source page currently supports one atomic factual claim. Returns supported, contradicted, or insufficient-evidence plus source snippets, or explicit blocked/unreachable/unsupported states. Not a general fact checker or web search.
Basesource-claim-proof.mattskowronis.workers.devfrom $0.011 endpoint - SSCRIPTMASTERLABSOther services
Quant snapshot for AMC: Live quote, completed-session levels (20-day ceiling/floor, ATR 14, SMA 20/50/200, pivots, 52-week range, relative volume) and a two-provider close cross-check.
Basesml-quant-terminal.onrender.comfrom $0.024 endpoints - SShopify AI Rank CheckerSearch & web
Checks how well a Shopify store's products show up when AI shopping assistants such as ChatGPT, Gemini, Perplexity, Grok, and Copilot search for products, and reports the store's rank and its closest competitors. Searches Shopify's real Global Catalog - the same product index AI assistants read from.
BaseSolanashopify-ai-rank-checker.underscoredone.comfrom $0.011 endpoint
XR-SentinelCrypto & DeFiXR-Sentinel behavioral pattern classification
xrplBasesentinel.xrpl-utilities.io—1 endpoint- SsendcheckCrypto & DeFi
SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain}
Basesendcheck-x402.pennyforgeorg.workers.devfrom $0.011 endpoint - PPayment-Injection ScreenCrypto & DeFi
Payment-Injection Screen by Agentropolis: send text your agent is about to act on (tool result, web page, email, file). Flags payment-looking instructions: pay/transfer requests, fake licence or refundable fees, swapped wallets, token approvals, seed-phrase asks, hidden text. Returns clean/caution/likely_payment_injection with evidence. Advisory only.
Baseseenly-injection-screen.vercel.appfrom $0.011 endpoint - Ssanctions-screen.mick8511.workers.devCrypto & DeFi
OFAC sanctions check for one crypto address on any chain (BTC, ETH and EVM chains, TRX, SOL, XMR, LTC, BCH, USDT, USDC and more): sanctioned yes/no, and for a hit the SDN entity name, type, sanctions programs, DOB, nationality and OFAC link, with the SDN list publication date and age. Screening aid, not legal advice. Free sample: https://sanctions-screen.mick8511.workers.dev/sample
Basesanctions-screen.mick8511.workers.devfrom $0.013 endpoints - RRisk Events APICrypto & DeFi
Returns active US severe-weather alerts (National Weather Service) for a state or a lat/lon point: event (hurricane, tornado, flood, heat, winter storm...), severity, urgency, area, effective and expiry times, instructions. Sorted by severity.
Baserisk-events-api.onrender.comfrom $0.024 endpoints - RRecurrence Rules (RRULE)Other services
Dates for every N business days, or the last or Nth business day of each month, skipping weekends and your holiday list.
BaseSolanaPolygon+1recurrence-rules.x402tookit.comfrom $0.024 endpoints - Rrecoup-qgrbqflbo-recoupable-ad724970.vercel.appOther services
Access to protected content
Baserecoup-qgrbqflbo-recoupable-ad724970.vercel.appfrom $0.0011 endpoint - WWickedAPI Protocol Health OracleCrypto & DeFi
All tracked protocols with their latest health score and verdict.
Baseprotocol-health-oracle.wickedapi.comfrom $0.0012 endpoints - VValidate a postal codeOther services
List every ISO 3166-1 alpha-2 country code for which a postal-code pattern is available.
Basepostal.openverbs.comfrom $0.0024 endpoints - PPolymarket EventsCrypto & DeFi
Prediction market events by topic — page through open or closed Polymarket events under one tag such as politics, crypto, economy, geopolitics or ai, each with status, dates, volume, liquidity and markets with current YES prices. Use to survey what a prediction market is pricing on a subject.
BasePolygonArbitrum+1polymarket.use.x402atlas.comfrom $0.012 endpoints - CConstant listSearch & web
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.
Basephysics.openverbs.comfrom $0.0043 endpoints - PPeerlyticsCrypto & DeFi
Liquidity depth history, 2026-10, CSV. Hourly observations of public USDC liquidity per payment platform and currency: listed depth, sellers, best premium, largest order near mid-market and depth within 0.5%, 1%, 2% and 3% of mid-market. Past hours cannot be reconstructed, so coverage starts at the first observation.
Basepeerlytics.xyzfrom $0.254 endpoints - Ppage.fluidrack.comOther services
Publish ephemeral page
Basepage.fluidrack.comfrom $0.011 endpoint - TTOTP (time-based)Other services
Generate an RFC 4226 counter-based HMAC one-time password from a base32 secret and counter. Configurable digits (6–10, default 6) and algorithm (SHA1/SHA256/SHA512, default SHA1). An invalid base32 secret is a clean 400.
Baseotp.openverbs.comfrom $0.0044 endpoints - Nnl-cm-kg.aiAI & agents
One paid call on nl-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://nl-cm-kg.ai/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.
Basenl-cm-kg.aifrom $0.011 endpoint - Mmosaisley.comAI & agents
The Papers, full edition: every dated world event (Wikipedia), every AI model release and new software version since your training cutoff.
Basemosaisley.comfrom $0.052 endpoints - LLookup MIME typeOther services
Resolve a MIME type to its default file extension.
Basemime.openverbs.comfrom $0.0022 endpoints - Mmed.halowerk.comData & research
Resolves two products to their RxNorm concepts and compares what the register declares about each: the active ingredient set, the strength per ingredient, the dose form and the route of administration. Every difference is listed individually rather than collapsed into a verdict, and matching ingredients with differing strengths are reported as such rather than as a match.
Basemed.halowerk.comfrom $0.0062 endpoints - Mmcpfax-utility.bowling-anthony.workers.devDeveloper tools
Email validation — Syntax check + live MX/deliverability + disposable-domain flag.
Basemcpfax-utility.bowling-anthony.workers.devfrom $0.0052 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.