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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- JJSON Validate, Repair, Convert, AI & agents
Every agent and developer hits broken or confusing JSON. This tool handles the common headaches in one place: check whether JSON is valid with the exact error location, repair near-JSON with typos, pretty-print or minify, pull values out with a path expression, diff two documents, convert to and from YAML or CSV, produce a byte-stable canonical form for hashing, validate against a schema, and repo
BaseSolanajson-suite.underscoredone.comfrom $0.011 endpoint - Hhlrisk.paidapis.netCrypto & DeFi
Current Ethereum mainnet gas price, in Gwei
Basehlrisk.paidapis.netfrom $0.0023 endpoints - HHacker News DataSocial & people
This tool reads live information from Hacker News, a popular website where people share and discuss technology news. You can either ask for a current list of stories (like the Top, New, Best, Ask, Show, or Job lists) or ask for every story, job posting, and poll that was posted on one specific calendar day in the past. You can also choose to pull in the discussion comments underneath each story, i
BaseSolanahackernews-data.underscoredone.comfrom $0.011 endpoint - Ggate-network.matsutake-lab.workers.devDeveloper tools
Twilio SMS and messaging send preflight. Validate a Twilio Messages.create payload before sending SMS/MMS or other supported messages. Returns static failures, warnings, and unknowns without sending the message.
BasePolygongate-network.matsutake-lab.workers.devfrom $0.0052 endpoints - SSimplify a fractionDeveloper tools
Reduce a fraction to lowest terms and describe it: numerator/denominator (denominator normalized positive), sign, whether it is an integer, and a mixed-number form when improper. A zero denominator is a clean 400.
Basefraction.openverbs.comfrom $0.0024 endpoints - Ffinanz.halowerk.comData & research
Day-ahead power prices for a European bidding zone from Energy-Charts, published by Fraunhofer ISE from Bundesnetzagentur SMARD data under CC BY 4.0 and therefore usable commercially with attribution. Returns the quarter-hourly or hourly curve with minimum, maximum, mean, the cheapest and the dearest hour, and how many intervals carry a negative price — the figures a load-shifting or battery decis
Basefinanz.halowerk.comfrom $0.0023 endpoints - WWickedAPI Filings OracleMarkets & finance
8-K material-event alerts classified into categories an agent can act on: earnings, exec_change, material_agreement, acquisition_disposition, bankruptcy, delisting, cybersecurity, auditor_or_restatement, control_change, financing, restructuring_impairment, shareholder_vote, governance, reg_fd, other_events. Each event lists every item with its official label.
Basefilings.wickedapi.comfrom $0.0023 endpoints - EENS ResolverCrypto & DeFi
Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.
BaseSolanaens-resolver.underscoredone.comfrom $0.011 endpoint - Ddao.halowerk.comCrypto & DeFi
Airdrop Eligibility Verifier 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.
Basedao.halowerk.comfrom $0.0013 endpoints - CCORS Header CheckerSearch & web
Sends a real request to any URL you provide, attaches an Origin header, and reads back all six standard cross-origin permission headers the server returns. Tells you whether cross-origin requests are enabled at all, whether your specific origin is permitted, and shows every permission value exactly as the server sent it. Useful for finding why a browser is blocking a request, confirming a new depl
BaseSolanacors-header-checker.underscoredone.comfrom $0.011 endpoint - Cconversion.halowerk.comOther services
Add-to-cart action audit fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.
Baseconversion.halowerk.comfrom $0.0013 endpoints - Ccms.halowerk.comOther services
CMS cache policy audit fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.
Basecms.halowerk.comfrom $0.0013 endpoints - BBIMI CheckerDeveloper tools
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 required format, checks any logo certificate is valid and unexpired, and confirms the domain has strict enough email protection turned on. Returns a clear pass or fail per domain, plus
BaseSolanabimi-checker.underscoredone.comfrom $0.011 endpoint - Bbarriere.halowerk.comOther services
Abbreviation expansion audit fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.
Basebarriere.halowerk.comfrom $0.0013 endpoints - AAura Agent CommerceAI & agents
Aura deterministic x402 purchase preflight from supplied OpenAPI metadata
Baseaura-revenue.helionixlabs.comfrom $0.012 endpoints - AASN LookupOther services
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 registry that manages it, and the exact address range it belongs to.
BaseSolanaasn-lookup.underscoredone.comfrom $0.011 endpoint - Aapi.trustsource.ccCrypto & DeFi
Check whether a domain's TLS/SSL certificate is valid, trusted, and not expiring before connecting to it. Performs a live handshake and returns a 0–100 score and tier (VALID/WEAK/EXPIRING/EXPIRED/UNTRUSTED/INVALID) with chain trust, days-to-expiry, signature algorithm, TLS version, and cipher quality. Use before submitting credentials, posting to a webhook, or following a payment link, to catch ex
Baseapi.trustsource.ccfrom $0.0022 endpoints - LLocus x402 ServicesOther services
Locus public pay-per-use API
Basealphavantage.x402.paywithlocus.comfrom $0.0083 endpoints - Aagoraverify.comData & research
Official French company data (SIRENE/RNE), cleaned: identity, geolocated HQ, NACE code, headcount, latest revenue and net income.
BaseArbitrumagoraverify.comfrom $0.0041 endpoint - AAgentic HoneypotMarkets & finance
Latest US Treasury securities auction results as clean JSON
Baseagentichoneypot.comfrom $0.0051 endpoint - Aagentic-trades.aiAI & agents
One Capital Markets Record for $0.01 USDC — a listed issuer's identity, registry identifiers, aliases, listing, disclosure events, auditor and transfer agent, each field sourced to the public filing, served from the node of the issuer's own market (eleven markets, in-country). Path: /x402/record/{node}/{exchange}/{code}, e.g. uk-cm-kg/LSE/BARC. The same record the free MCP door serves; the payment
Baseagentic-trades.aifrom $0.012 endpoints
Wingman Agent GatewaySearch & webLive web search for AI agents. POST a query and get the top results as JSON [{title, url, snippet}] (count: default 8, up to 25). Pay per call in USDC on Base with x402: no account and no API key. Read any result with /v1/web_read.
Baseagent.wingmanprotocol.comfrom $0.0023 endpoints- Aagent-memory-api-production-f2c4.up.railway.appAI & agents
List all stored memories in a namespace, most recently updated first. Returns a JSON array of memory records.
Baseagent-memory-api-production-f2c4.up.railway.appfrom $0.0012 endpoints - Aaegis-ai.xyzAI & agents
Aegis - Cut Through the Noise in Your Feeds. ブリーフィング トップ3
Baseaegis-ai.xyzfrom $0.0062 endpoints - JJMT EDGAR Company LookupMarkets & finance
Company intelligence lookup: resolve a US-listed company ticker through the SEC EDGAR company ticker dataset. Returns CIK, ticker, and registrant name for company research, SEC filing discovery, and equity due diligence.
Basex402.jmthomasofficial.comfrom $0.0021 endpoint - Xx402.getautomatedrcm.comCrypto & DeFi
Healthcare text de-identification engine (demo endpoint — SYNTHETIC/TEST DATA ONLY, never send real PHI; nothing is stored). Strips names, DOBs, member/claim IDs, phones, emails, addresses, SSNs; dates become a derived interval timeline (service-to-denial days, days-ago) so denial and timely-filing math survives de-identification. Returns scrubbed text + token map for local re-identification. Prod
Basex402.getautomatedrcm.comfrom $0.011 endpoint - Xx402-v2-mint-schema-json-repair.vercel.appOther services
Deterministic JSON repair + coerce to caller schema. Diff of changes. Fail closed (no charge) if still invalid.
Basex402-v2-mint-schema-json-repair.vercel.appfrom $0.0051 endpoint - Xx402-v2-mint-doi-metadata.vercel.appOther services
DOI metadata via Crossref (primary) + OpenAlex fallback. Title/authors/year/venue/URL.
Basex402-v2-mint-doi-metadata.vercel.appfrom $0.0051 endpoint - Xx402-agents-production.up.railway.appMarkets & finance
Return live cross-exchange perpetual funding rates and the largest annualized funding divergences.
Basex402-agents-production.up.railway.appfrom $0.0082 endpoints - Wwitness.bnbot.aiSocial & people
Get tweet details with signed proof
Basewitness.bnbot.aifrom $0.011 endpoint
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.