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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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Developer tools
43 results- DDomain Age CheckerDeveloper tools
Send a list of domain names and this tool tells you exactly how old each one is, when it was first registered, when it expires, and how much time is left before expiration. Great for spotting brand-new suspicious domains, researching competitors, or evaluating domains before buying or linking to them. Works with over 100 domain extensions worldwide.
BaseSolanadomain-age-checker.underscoredone.comfrom $0.012 endpoints - BBulk DMARC Record LookupDeveloper tools
Give this tool a list of domain names and it will instantly check each one's DMARC email security record. DMARC is a standard that tells email providers how to handle fake or spoofed emails pretending to come from your domain. For each domain you submit, you get back whether a valid record exists, what the policy is (none, quarantine, or reject), whether reporting addresses are set up, and the ful
BaseSolanadmarc-lookup.underscoredone.comfrom $0.011 endpoint - Ffiles.camelai.ioDeveloper tools
Upload a file and get a temporary signed URL. Send raw file body with Content-Type header. Returns a URL valid for 1 hour.
BasePolygonSolanafiles.camelai.iofrom $0.0011 endpoint - WWeb ProbeDeveloper tools
Time one GET to a URL: DNS, connect, TLS, first byte and total ms, plus status, content type and size read.
BaseSolanaPolygon+1web-probe.x402tookit.comfrom $0.023 endpoints - EEmail Verifier & ValidatorDeveloper tools
Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into username and domain, and flags free providers and role accounts like admin@ or support@. One address per call.
BaseSolanaemail-verifier.underscoredone.comfrom $0.011 endpoint - DData Transform APIDeveloper tools
Transform JSON records or CSV uploads with typed schemas and Polars SQL. Filter, aggregate, join and reshape data. Pricing depends on input size and SQL statement count; the 402 response contains the exact USDC amount.
Solanaultra-endpoints.comfrom $0.00111 endpoint
IPPulseDeveloper toolsIP geolocation, ASN and reputation lookup: VPN/Tor proxy, hosting and botnet C2 flags with an abuse score, for any IPv4 or IPv6 address.
BaseSolanaippulse.waltsoft.netfrom $0.0051 endpoint- RRadio & RF CalcDeveloper tools
Convert power between dBm, dBW, mW and W, and the RMS and peak voltage across 50 ohms (or your impedance).
BaseSolanaPolygon+1radio-calc.x402tookit.comfrom $0.021 endpoint
DNSPulseDeveloper toolsDomain & DNS intelligence — records, SSL certs, subdomain discovery.
BaseSolanadnspulse.waltsoft.netfrom $0.0051 endpoint
Subpay invoice readerDeveloper toolsReads construction pay applications — the AIA G702 Application and Certificate for Payment with its G703 Continuation Sheet, including Procore and Textura versions — and change orders, from PDF into structured JSON with arithmetic checks. $0.04 per page (up to 25 pages), quoted per document.
Solanasubpay.aifrom $0.044 endpoints- Sstableemail.devDeveloper tools
Buy an inbox on stableemail.dev ($1, 30 days). forwardTo is optional — omit it to use as a programmatic mailbox via the messages API (retainMessages enabled automatically). Message content and attachments are retained for 90 days.
Solanastableemail.devfrom $1.001 endpoint - SScorpTech ReconDeveloper tools
All common DNS records for a domain via Cloudflare DNS-over-HTTPS: A, AAAA, NS, MX, TXT, CAA.
Solanascorptech-recon.agent.deno.netfrom $0.0011 endpoint - Mmerchant.payai.networkDeveloper tools
PayAI facilitator API key + credits for the requested USD amount
Solanamerchant.payai.networkfrom $1.001 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.