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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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4,372 results- Ee-invoice-validatorCrypto & DeFi
Check a Romanian e-Factura (UBL 2.1, CIUS-RO 1.0.9) before uploading it to ANAF SPV, and get the exact fix for every error: plain-English explanation, the official Romanian rule text, the UBL path of the field and, for amount errors, the correct value computed from the invoice (chained, so following the report gives a consistent invoice). Also validates Peppol BIS Billing 3.0 and EN 16931. No acco
Baseeinvoice.alexhub.ukfrom $0.013 endpoints - SSourceLensOther services
Inspect a public JSON, RSS, or Atom URL, detect its record structure, and return a normalizer-verified FreshDelta monitoring configuration with stable IDs, selected fields, confidence, and warnings.
Basedelta.rursus.appfrom $0.011 endpoint - Aapi-datos-uy-arOther services
Tasas de referencia del BCRA: política monetaria, BADLAR y TAMAR.
Basedatosuyar.devfrom $0.0031 endpoint - SSignals RadarCrypto & DeFi
Real-time crypto threat and risk intelligence for AI agents. Get up to 20 recent source-linked risk reports with risk scores, freshness, validation status and cached PG1 checks when available. Designed for automated triage and review. 0.01 USDC per snapshot on Base via x402; no API key or subscription required.
Basecrypto-threat-signals-api.onrender.comfrom $0.011 endpoint - Bbillitright.coOther services
Password - CASA Cybersecurity Assessment - Consolidates evidence on secure communications, including certificate validity, hostname matching, protocol and cipher strength, forward secrecy, and TLS vulnerabilities. It determines whether the service uses a secure, authentic, and correctly configured transport channel.
Basebillitright.cofrom $0.011 endpoint - Bb702.everygoodwork.ioOther services
a play of b702 — You can use it for the time you paid for. What it opens for you is yours, and the creator who sold it to you keeps paying to host it.
Baseb702.everygoodwork.iofrom $0.011 endpoint - Aatomic-verify-claim-poc.topadvancement-atomic.workers.devSocial & people
Resolve an HTTP or HTTPS URL through redirects and return the complete redirect chain, HTTP status for each hop, final URL, and redirect safety findings. Use when an agent needs to determine where a URL actually leads before visiting, citing, downloading, or trusting it.
Baseatomic-verify-claim-poc.topadvancement-atomic.workers.devfrom $0.011 endpoint - Aapi.octodamus.comCrypto & DeFi
Octodamus — AI oracle for crypto and tokenized NYSE markets. BUY/SELL/HOLD signals, Polymarket edges, Fear & Greed, macro regime. Ed25519 signed.
Baseapi.octodamus.comfrom $0.011 endpoint - GGridHub Electricity DataData & research
Current headline values (price, demand, and where published carbon intensity) for all 25 GridHub zones in one call. Use to compare or rank grids right now; rebuilt every 5 minutes. For one zone with context use /v1/brief/{zone}.
Baseapi.grid-hub.appfrom $0.0012 endpoints - FFresh402 Web IntelligenceOther services
Use Check for a changed/unchanged signal and optional compact text diff. Exactly one URL or existing watch ID; URL plus rules can create a watch, whereas watch_id reuses saved rules and forbids overrides. Use Smart Diff for structured changes. On-demand only; x402 $0.005 USDC on Base, including cache hits.
Baseapi.fresh402.comfrom $0.0051 endpoint - Aapi.freestylevault.comOther services
Committed IFTA tax rates for a quarter (?quarter=2026-Q2&fuel_type=diesel&jurisdiction=WA), grouped by jurisdiction × fuel type with effective periods clipped to the quarter — mid-quarter revisions read as separate periods. Human-reviewed against iftach.org every quarter.
Baseapi.freestylevault.comfrom $0.0051 endpoint - AAgent Revenue NetworkMarkets & finance
AI-agent execution verification and automated task acceptance: evaluate caller-supplied functional, security, privacy, compliance, transaction, abuse, regression and economics gates; ARN does not perform the underlying checks. Re-run for each release or evidence change; sustained CI users can switch to the 30-day Release Guard pass.
Baseagentrevenuenetwork.comfrom $0.011 endpoint - Aagentcrush.xyzAI & agents
Verification and tier status for an AI agent on AgentCrush. Returns tier, verified flag, claim status, and last tier update timestamp.
Baseagentcrush.xyzfrom $0.0051 endpoint - Aagent-endpoint-readiness.ryannelson2000.workers.devAI & agents
Deterministic pre-purchase readiness and payment-metadata audit for public agent endpoints
Baseagent-endpoint-readiness.ryannelson2000.workers.devfrom $0.0021 endpoint - 221millionpixels.artOther services
Paint one pixel on 21millionpixels.art, a shared 21,000,000-pixel canvas. Reads are free; paid pixels skip the human cooldown.
BaseSolana21millionpixels.artfrom $0.0052 endpoints - Yyield.trdefi.comOther services
TRDEFI prepare request
BaseEVM chain 5042yield.trdefi.comfrom $0.022 endpoints - Xx402check.genexxis.comOther services
All CDP Bazaar listings of one host: endpoint count, summed 30-day payers and calls, estimated 30-day revenue, top 20 endpoints with price and payers, distinct payTo addresses, and which x402 discovery docs the origin serves.
Basex402check.genexxis.comfrom $0.0052 endpoints - Xx402-v2-mint-zip-code-lookup.vercel.appOther services
Postal code lookup via api.zippopotam.us (keyless). Country + postal → places (name/state/lat/lon).
Basex402-v2-mint-zip-code-lookup.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-whois-rdap.vercel.appDeveloper tools
Domain RDAP via IANA DNS bootstrap. Registrar/NS/status/events. SSRF-safe.
Basex402-v2-mint-whois-rdap.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-uuid-mint.vercel.appOther services
Mint 1-32 UUID v4 / v7 / ULID identifiers (v1 kept). Offline. Amp port + Wave 21 kinds.
Basex402-v2-mint-uuid-mint.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-usgs-water-flow.vercel.appOther services
USGS NWIS instantaneous values (keyless). sites or stateCd (+ parameterCd default discharge 00060) → trimmed IV series.
Basex402-v2-mint-usgs-water-flow.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-url-normalize.vercel.appOther services
Canonicalize URL: force HTTPS, strip tracking, lowercase host, sort query. Offline. Amp port.
Basex402-v2-mint-url-normalize.vercel.appfrom $0.0051 endpoint - Xx402-v2-mint-tx-status.vercel.appCrypto & DeFi
Transaction receipt status/block/confirmations on Base or Ethereum via eth_getTransactionReceipt. Validates 0x hash BEFORE settle.
Basex402-v2-mint-tx-status.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-slugify.vercel.appOther services
Turn free text into a URL-safe lowercase slug. Offline. Amp port.
Basex402-v2-mint-slugify.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-similarity-dedupe.vercel.appOther services
Lexical similarity suite: Levenshtein, Jaro-Winkler, Jaccard, SimHash Hamming + duplicate verdict. No embeddings.
Basex402-v2-mint-similarity-dedupe.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-safe-math.vercel.appDeveloper tools
Exact decimal/rational math with optional units + step trace. AST-sandboxed (no eval).
Basex402-v2-mint-safe-math.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-rag-chunker.vercel.appCrypto & DeFi
Token-aware text chunks with heading path inheritance and stable sha256 chunk ids (cl100k).
Basex402-v2-mint-rag-chunker.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-pii-redact.vercel.appDeveloper tools
Deterministic PII redaction: emails, phones, SSN-shaped, Luhn cards, IPv4 → typed placeholders. No network. Amp port.
Basex402-v2-mint-pii-redact.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-phone-e164.vercel.appOther services
Parse/validate/format phone to E.164 via libphonenumber offline. No owner/carrier lookup.
Basex402-v2-mint-phone-e164.vercel.appfrom $0.0021 endpoint - Xx402-v2-mint-name-resolve.vercel.appCrypto & DeFi
ENS (.eth) + Basename (.base.eth) forward/reverse resolution on Base/Ethereum public RPC. Avatar optional. Amp port.
Basex402-v2-mint-name-resolve.vercel.appfrom $0.0031 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.