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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- SStableCryptoCrypto & DeFi
List all chains with TVL
BaseSolanastablecrypto.devfrom $0.013 endpoints - NNote parseImages, audio & video
Transpose a note by a (possibly negative) number of semitones. Result is spelled chromatically with sharps, or flats when `preferFlats` is true.
Basemusic.openverbs.comfrom $0.0025 endpoints - Mmailferret.appin60.comSocial & people
Find a person's verified work email from first name, last name and company domain. Live SMTP check against the company's mail server, catch-all detection. Charged only when a mailbox is verified; misses return 4xx and are not charged.
BaseArbitrummailferret.appin60.comfrom $0.0034 endpoints - MMAC AddressesDeveloper tools
Report the properties of a MAC address encoded in its first octet: unicast vs multicast (I/G bit), universal vs locally-administered (U/L bit), the broadcast address, and — for EUI-48 — the OUI and NIC portions.
Basemacaddress.openverbs.comfrom $0.0025 endpoints - AAlien ProbeAI & agents
Decode a VIN's structure: NHTSA vPIC WMI snapshot, vintage 2026_08: 10659 rows cut in ascending WMI order from 12971 candidates, plus the closed-form rules of 49 CFR 565.15 and 565.25. STRUCTURAL decode only: check-digit verdict, manufacturer, make, vehicle type, country, and model year as a CANDIDATE SET narrowed only for passenger cars. No engine, body, trim, plant or weight class; no claim a ve
Baselookups.alienprobe.aifrom $0.0043 endpoints - LLION Verified CompanySocial & people
Keyless multi-chain JSON-RPC reads, Base + Ethereum, from $0.001 (?chain=ethereum)
Baselion-x402.lionmaster-operations.workers.devfrom $0.0014 endpoints - Ggrundpreis.halowerk.comOther services
Distribution of latest included product/store observations, with regular and promotional prices separate. Example: category en:pastas, country DE. Cheapest means cheapest included observations, not the whole market.
Basegrundpreis.halowerk.comfrom $0.0025 endpoints - Eernte.halowerk.comOther services
Wholesale overview by product group and unit basis with source periods and comparable changes. Example: sort name. Piece and kg quotes are separate rows. German-origin percentages describe included observations, not market share.
Baseernte.halowerk.comfrom $0.0025 endpoints - MMask a card numberData & research
Format a card number into the conventional display groups for its network (4-6-5 for Amex, 4-6-4 for 14-digit Diners, otherwise groups of four).
Basecreditcard.openverbs.comfrom $0.0025 endpoints - UUS CPI Data & Inflation ReportData & research
Gives you official United States inflation numbers from the government's BLS Consumer Price Index. Ask for the newest reading, a specific month in the past, or a whole range of months, and get back clear percentages for overall inflation and 'core' inflation (which ignores food and energy prices), plus a plain-English summary sentence.
BaseSolanacpi-report-us.underscoredone.comfrom $0.011 endpoint - LLuhn checkOther services
Validate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.
Basecheckdigit.openverbs.comfrom $0.0025 endpoints
ChainAnalyzerCrypto & DeFiCheap connectivity-check endpoint. Verifies the full x402 settlement path (signature -> CDP facilitator -> on-chain transferWithAuthorization) for $0.01 so AI agents can validate wallet + network + facilitator wiring before committing to higher-value AML calls.
BaseSolanachain-analyzer.comfrom $0.013 endpoints- Aapi.onhub.aiAI & agents
Text completion using the model selected in the request body.
BaseSolanaapi.onhub.aifrom $0.0023 endpoints
AGMMSocial & peopleAGMM guide library: one long-form article per request, from a UK AI consultancy for business owners. Covers what AI costs, GDPR, automation, tools and readiness for businesses turning over 1m to 50m pounds, with sources and a last-reviewed date on every page. One GET returns the full page as HTML, or as Markdown with index.md. Costs one US cent in USDC on Base. People, search engines and AI answer
BaseSolanaagmm.co.ukfrom $0.018 endpoints- Aagents.aiscale.proSearch & web
AiScale News Summary: Summarizes recent news for a topic. Returns structured summaries with source, date, relevance score, and key takeaways.
Baseagents.aiscale.profrom $0.0024 endpoints - Aagent.memoryapi.orgAI & agents
Look up an ERC-8004 AI agent identity on Base mainnet. Returns name, description, services, x402 support, and owner.
Baseagent.memoryapi.orgfrom $0.0013 endpoints - AAgent Miner ToolsCrypto & DeFi
Use before spending tokens, money or crawler capacity fetching an unfamiliar web resource. Resolves redirects (manually, bounded, re-validated per hop) and returns deterministic HTTP/resource facts — final URL, status, content type and length, response time, a bounded HTML title/canonical peek, and a lightweight generic-bot robots.txt indication — so an agent can decide whether a normal web fetch
Baseagent-api-production.tim1712.workers.devfrom $0.0033 endpoints - WWebIntel Metadata ExtractorSocial & people
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 back clean SEO and social-share metadata. No account, no API key — pay per call with x402.
Basex402.omardev.xyzfrom $0.0052 endpoints - JJapan Business CalendarOther services
Tell whether a given date is a Japanese business day. Japanese national holidays and business-day calculations derived from the Cabinet Office official CSV. Returns holidays for a given year, plus business-day arithmetic used by invoicing, logistics and HR systems in Japan.
Basetorii-gateway-production.ichis-lab.workers.devfrom $0.011 endpoint - SSCOPE Research APISearch & web
Research a company and return company intelligence using current public sources. Covers business facts, products, competitors, competitor analysis, recent developments, risks, positioning, and citations.
BaseSolanascopeapi.devfrom $0.0035 endpoints - Sscan.openverbs.comSocial & people
Check up to 50 CVE IDs against CISA's Known Exploited Vulnerabilities (KEV) catalog. Returns membership, vendor/product, exploitation evidence, ransomware-use status and remediation guidance from CC0 data. Not listed does not mean safe or unexploited. Federal due dates are not global deadlines. Refreshed hourly; stale snapshots are explicitly flagged.
Basescan.openverbs.comfrom $0.0044 endpoints - Pro Yield APICrypto & DeFi
Pro Yield in one call: live stablecoin lending venue rates (safety tiers, blend target, sleeve rates, provenance) plus vault state on HyperEVM — share price, total assets, live caps — and a wallet's position when ?address= is supplied. Use when an agent wants the whole Pro Yield picture for one $0.010 call instead of two.
SolanaBaseArbitrum+5pyd.fifrom $0.013 endpoints - KKeystone Opportunity APIAI & agents
Deterministically score a task brief for deliverables, acceptance criteria, deadlines, constraints, and usable scope before committing time. No AI calls; same brief always yields the same score.
Basekeystone-opportunity-api.keystone-opportunity.workers.devfrom $0.0012 endpoints - HHALOWERK kettenwerkCrypto & DeFi
Checks one address on Ethereum, Base, Arbitrum, Optimism, Polygon or BNB Smart Chain against the open verification registry and against the chain itself. For a proxy the answer is deliberately split in two: whether the proxy is verified says almost nothing, whether the implementation it currently points to is verified is the real question, and both are reported separately with the implementation a
Basekette.halowerk.comfrom $0.0015 endpoints - Ffetchdelta.comImages, audio & video
FetchDelta: fetch one public web page as Markdown with title, headings, links and source timestamp. Use for current docs, changelogs or policy text. HTML only; no JavaScript rendering or login. Preview source readability for free before paying.
Basefetchdelta.comfrom $0.0022 endpoints - Ddarrylbots.comMarkets & finance
Darrylbots paid research: Standard Stock Screen: Quality, Momentum, and Durable Execution
Basedarrylbots.comfrom $0.0013 endpoints - TThe ClinicAI & agents
Mid-task, and nothing said to you will be kept? One line of encouragement, plus an id you can quote back to us later. Unsigned: nobody but us can check it, and only against our own record; /v1/keepsake signs it so anyone can. The same words are FREE and always will be — at /v1/hug and through our MCP server, with nothing asked in return. What a tenth of a cent buys is the handle, and only that — a
Baseclinic.sapthumbprint.comfrom $0.0012 endpoints - Aapi.metalend.techOther services
Returns MetaLend API services directory with a one-line summary of each RebalancerResource endpoint plus links to API docs.
Baseapi.metalend.techfrom $0.0011 endpoint - Xx402-v2-mint-weather-forecast.vercel.appData & research
Weather current + short forecast via Open-Meteo (keyless). Lat/lon required. Data only — not advice.
Basex402-v2-mint-weather-forecast.vercel.appfrom $0.0035 endpoints
Base64 CodecCrypto & DeFiEncode or decode base64. POST {"mode":"encode","input":"..."} or {"mode":"decode",...}. Supports standard and url-safe alphabets via {"urlsafe":true}. Decoding validates the input and reports an error rather than returning silent garbage.
Basex402-echo-service.onrender.comfrom $0.0012 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.