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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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153 results
BlackForgeCrypto & DeFiBlackForge crypto market data from the major spot exchanges: every column, 1-minute to daily buckets, 90-day lookback. Covers 100 billable rows; finer buckets and premium columns count as more than one row each.
BaseArbitrumPolygonapi.blackforge.sofrom $0.0052 endpoints- SSSL/TLS Certificate CheckCrypto & DeFi
SSL/TLS certificate check: expiry, issuer, SANs, chain validity, hostname match, negotiated protocol/cipher, and weak-algo warnings for a public HTTPS host. Clean JSON.
BasePolygonArbitrum+1ssl.use.x402atlas.comfrom $0.011 endpoint - SSchedule & Timezone ToolsDeveloper tools
Cron next-run calculator — generate future times for bounded five-field POSIX cron schedules in IANA timezones with explicit daylight-saving (DST) policies.
BasePolygonArbitrum+1schedule-tools.use.x402atlas.comfrom $0.0055 endpoints - HHoldsUpData & research
Published fact-checked episodes, newest first, with optional filters by category slug, show id or speaker slug. Paged.
BaseArbitrumPolygonholdsup.appfrom $0.012 endpoints - AArtifact InspectorCrypto & DeFi
JSON Web Key (JWK) inspector — validate bounded public RSA, EC, or Ed25519 keys and calculate RFC 7638 SHA-256 thumbprints without ownership or trust claims.
BasePolygonArbitrum+1artifact-inspector.use.x402atlas.comfrom $0.0055 endpoints - EEarthquake IntelligenceSearch & web
Recent earthquakes — search newest-first USGS seismic events by rolling time window and minimum magnitude, with revision, freshness, and provenance.
BasePolygonArbitrum+1earthquakes.use.x402atlas.comfrom $0.0052 endpoints - PPeru Rates and InflationOther services
Lima consumer price inflation — latest monthly CPI percentage change for Metropolitan Lima, Peru. Track inflation and purchasing power trends with the reference month.
BasePolygonArbitrum+1peru-macro.use.x402atlas.comfrom $0.012 endpoints - UURL to Base64Images, audio & video
Fetch any public URL and return its content as base64 with the content type and a ready-to-use data URI. Embed images, PDFs and files directly in LLM and API calls without downloading them yourself. Clean JSON.
BasePolygonArbitrum+1base64encode.use.x402atlas.comfrom $0.011 endpoint - Aapi.dexl.ioSocial & people
Detailed profile for a single AI agent (by chain + agentId)
BaseArbitrumRobinhood Chainapi.dexl.iofrom $0.0012 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 - 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 - UUS National DebtData & research
US national debt — latest total federal debt, debt held by the public and intragovernmental holdings in US dollars. Track government borrowing and build fiscal monitoring dashboards.
BasePolygonArbitrum+1us-debt.use.x402atlas.comfrom $0.011 endpoint - BBrazil Rates and InflationOther services
Brazil IPCA inflation — latest monthly consumer-price change in percent. Track inflation and purchasing-power trends with the reference month.
BasePolygonArbitrum+1brazil-macro.use.x402atlas.comfrom $0.012 endpoints - UUUID InspectorOther services
UUID inspector — parses any UUID (canonical, braces, URN or 32-hex form) and returns its version, variant, embedded timestamp for v1/v6/v7, nil/max flags, hex and URN forms. Use to validate identifiers or recover the creation time of UUIDv7 keys.
BasePolygonArbitrum+1uuid.use.x402atlas.comfrom $0.0052 endpoints
PerpRadar by AgentGateImages, audio & videoBulk token risk check API for Base (batch honeypot and rug scan). Batch Base token risk verdicts: up to 20 ERC-20 addresses in one call, priced per address, each with the same fixed JSON as /v1/verdict (verdict safe / caution / danger, risk_score 0-100, honeypot and tax simulation, owner privileges, proxy, LP, holders, verified, age; unknown when a source is down). Charged only when at least one a
BasePolygonArbitrum+1api.youraitools.cofrom $0.000569 endpoints- VVerifiable Random ToolsImages, audio & video
Verifiable Random shuffle — a uniform Fisher-Yates permutation bound to a future drand round the server waits for (typically 3-6s) and verifies locally, with original indices and a reproducible proof transcript.
BasePolygonArbitrum+1verifiable-random.use.x402atlas.comfrom $0.0053 endpoints - FFastPath Bitcoin APIOther services
Pay once to receive a short-lived WebSocket ticket for the live Bitcoin mempool stream.
BasePolygonArbitrum+1api.nativebtc.orgfrom $0.0052 endpoints - UURL Unwrap / Redirect TracerCrypto & DeFi
Trace an HTTP redirect chain to its final destination without downloading page bodies. Returns every hop (URL + status), the final URL, and safety warnings — link-safety grounding for agents before they visit or cite a URL. Clean JSON.
BasePolygonArbitrum+1unwrap.use.x402atlas.comfrom $0.0091 endpoint
DevX VoiceImages, audio & videoMachine translation for agents between 100 languages: send text (up to 5,000 chars), target_lang and optional source_lang (auto-detect by default) and get the translation. $0.001 USDC per started 1,000 characters on Base; failures are not charged. LibreTranslate/dTelecom-style {q, source, target} also accepted at /v1/translation. M2M100 1.2B. By DevX.
AvalancheBasePolygon+2voice.madebydevx.comfrom $0.0014 endpoints- QQR Code & Identicon GeneratorCrypto & DeFi
Identicon generator — turn an exact UTF-8 seed into a deterministic mirrored avatar returned as base64-encoded SVG or PNG in JSON.
BasePolygonArbitrum+1visuals.use.x402atlas.comfrom $0.0052 endpoints - SStablecoinPulseCrypto & DeFi
Stablecoin peg tick — USDT, USDC, USDS, DAI, USDe, USD1 in ONE $0.01 call: live price, deviation from $1, 24h change, and a deterministic STABLE / WATCH / ALERT verdict per coin. Built for monitoring loops: call it every cycle, escalate to /api/depeg-watch for the single-coin deep read when a verdict is not STABLE. 60s freshness, cited to CoinGecko, no LLM in the path.
BaseSolanaPolygon+8stablecoinpulse.theaslangroupllc.comfrom $0.015 endpoints - FFDA Drug LabelData & research
FDA drug label lookup — the newest prescribing information for a brand or generic drug name: boxed warning, indications, dosage, contraindications, warnings, adverse reactions and drug interactions as previews or one section in full, plus manufacturer, route, RxNorm, UNII and application numbers. Use to read what a drug is approved for and its official warnings.
BasePolygonArbitrum+1fda-drugs.use.x402atlas.comfrom $0.013 endpoints
BorderScoutOther servicesUS border wait times: live CBP waits at all 85 US-Mexico and US-Canada land ports of entry, ranked by drive time plus wait for each lane (standard, SENTRI/NEXUS, Ready Lane, FAST) for passenger, commercial or pedestrian traffic. BorderScout
BaseArbitrumPolygon+2borderscout.scalpstream.comfrom $0.011 endpoint- AAcademic Paper SearchSearch & web
Scientific and academic paper search: research papers and scholarly literature from arXiv, PubMed, OpenAlex, Crossref and Semantic Scholar in one call, deduplicated and retraction-aware. Each hit: DOI, authors, venue, snippet, citation count and citations per year, type, open-access PDF link. Sort by relevance, recency, citations or impact. Keyless. For literature review and citing research.
BasePolygonArbitrum+1papers.use.x402atlas.comfrom $0.0052 endpoints - HHosakaSocial & people
Use when you have a company domain and need to know what the company is before spending more. Returns the company name and site title, domain age, registrar, mail provider, DNS provider, DMARC and HTTPS status, and a count of the third-party vendors detected. One call, no signup, no API key. The cheapest way to qualify a domain before buying a fuller record.
BasealgorandPolygon+4hosaka-agents.vercel.appfrom $0.0051 endpoint - OOpen Source Vulnerability CheckSocial & people
Batch dependency vulnerability check — check ordered exact package versions in OSV with deduplicated CVE enrichment, explicit completeness, and CISA KEV known-exploited signals.
BasePolygonArbitrum+1dependency-risk.use.x402atlas.comfrom $0.0053 endpoints - CClinical Trial SearchSearch & web
Clinical trial search — find ClinicalTrials.gov studies by free text, condition, intervention, sponsor, recruitment status and phase, and get each study's NCT id, titles, status, phases, conditions, interventions, sponsor, start and completion dates, enrollment and whether results are posted. Use for drug development, medical research and patient-recruitment questions.
BasePolygonArbitrum+1clinical-trials.use.x402atlas.comfrom $0.012 endpoints - BBiomedical Grant SearchSearch & web
NIH-funded project search — find grants by words in the title, abstract or research terms, filtered by fiscal year, NIH institute, organisation, state, activity code, SBIR/STTR mechanism or award size, with the fiscal-year award amount, investigators, organisation and dates for each. Use to see who NIH funds on a topic, how much, and which small companies.
BasePolygonArbitrum+1biomedical-grants.use.x402atlas.comfrom $0.013 endpoints - Aagora-x402-production.up.railway.appData & research
Official French company data (SIRENE/RNE), cleaned: identity, geolocated HQ, NACE code, headcount, latest revenue and net income.
BaseArbitrumagora-x402-production.up.railway.appfrom $0.0041 endpoint - TTwitter/X Tweet Media DownloaderImages, audio & video
Twitter (X) video & image downloader — pass a public tweet / X post URL, get direct CDN media links: .mp4 video URLs with thumbnails plus every image in the post, ready to stream, embed, re-host, or download. No scraping or browser automation.
BasePolygonArbitrum+1xmedia.use.x402atlas.comfrom $0.0051 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.