Explore APIs
Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
- Projects
- 4.4K
- Paid endpoints
- 87K
- Paid calls · 30 days
- 885K
- Launched here
- 0
AI & agents
559 results- Oopen-research-agent.comAI & agents
AI-generated standard research report (Open Research Agent)
Baseopen-research-agent.comfrom $0.101 endpoint - AAgent Action Safety Quick GateAI & agents
AI agent action safety: one-cent deterministic preflight for every consequential agent command. Returns risk, matched rule ids, and an exact machine-readable escalation call: full DestructGuard evidence for medium risk or the complete Action Safety workflow for high and critical risk.
Basehermesplant.comfrom $0.011 endpoint
Verify deliverable, code onlyAI & agentsVerify output another AI agent hands back, by code alone, for $0.005: no model call, answers in about a second. Recomputes the deliverable's written sums, totals, percentages, dates, weekdays, time spans, unit conversions, and list counts; checks lengths the task asks for; flags placeholders and prompt injection; measures words, items, and JSON shape. Signed receipt, tier lite. For every requireme
BaseBase Sepoliacrosscheckapi.comfrom $0.0051 endpoint- CCHAPPY Japan Address PreflightAI & agents
Reproducible Japan Post evidence before an autonomous agent submits a Japanese address. One 0.02 USDC x402 call returns a fail-closed town-level consistency decision, ordered source candidates, source version and SHA-256, explicit limitations, and the next safe input action. It does not claim deliverability, residence, identity, building, or room existence.
Basechappy-japan-address-preflight.pre23964wb.workers.devfrom $0.021 endpoint
BrainChainAI & agentsJev hires a model for your task and grades the result. Rejected work is refunded.
Robinhood ChainBasebrain.usebrainchain.comfrom $1.001 endpoint
x402 Identity HubAI & agentsCheck whether an ENS identity name for an AI agent, API or MCP server is available on x402 Identity Hub (*.402bot.eth, *.402api.eth, *.402mcp.eth). Returns availability, the mint fee and where to register.
Baseapi.x402id.devfrom $0.0011 endpoint- Aagenttrust.ukAI & agents
Scan any OpenClaw SKILL.md for malware, prompt injection, exfiltration, and 37 other threat patterns. Returns risk score 0-100 and detailed findings.
Baseagenttrust.ukfrom $0.011 endpoint - Xx402-ai-starter.vercel.appAI & agents
Access to protected content
Base Sepoliax402-ai-starter.vercel.appfrom $0.0051 endpoint - Nnickeljoke.vercel.appAI & agents
Premium AI joke generation
Base Sepolianickeljoke.vercel.appfrom $0.0051 endpoint - Eeffectguard-x402-experiment.onrender.comAI & agents
Coordinate agents sharing one account: reuse matching JSON reads within 30 seconds, or stop duplicate operations using a stable business event ID. Enroll once at /v1/enroll, then authenticate paid calls with your Bearer key. After EXECUTE use /v1/start and /v1/commit around your own tool. Same-request payment recovery is free. Integration and cost measurement: /agent. External execution is not gua
Baseeffectguard-x402-experiment.onrender.comfrom $0.011 endpoint - AAcme Listings (demo)AI & agents
Demo of Stilebase pay-per-page for AI agents: rental listings in Springfield with price, bedrooms and what's special about each home. Test USDC on Base Sepolia.
Base Sepoliademo.stilebase.comfrom $0.011 endpoint - Aagent-tariff-lookup.iykykblog.workers.devAI & agents
Look up US import duty rates by HTS code or product description. Returns the base General (MFN) and Column 2 rates of duty from the official USITC Harmonized Tariff Schedule (public domain). Reference only: Section 301/232, IEEPA and other additional duties are not included.
Baseagent-tariff-lookup.iykykblog.workers.devfrom $0.081 endpoint - Aagent-smb-loan-verify.iykykblog.workers.devAI & agents
Verify a small business's SBA loan history: every SBA 7(a) and 504 loan since 1991 — amounts, approval dates, program, and outcome (paid in full, charged off, defaulted, cancelled). SBA FOIA disclosure data, federal public domain.
Baseagent-smb-loan-verify.iykykblog.workers.devfrom $0.081 endpoint - Aagent-drug-verify.iykykblog.workers.devAI & agents
Look up FDA drug product information by NDC or name: labeler, dosage form, route, marketing status, approval date. Public-domain FDA NDC Directory data.
Baseagent-drug-verify.iykykblog.workers.devfrom $0.011 endpoint - Aagent-device-verify.iykykblog.workers.devAI & agents
Composite medical-device risk card from a UDI device identifier (DI), brand, or labeler company. Returns the GUDID labeler record (brand, company, GMDN term, version/model, catalog number), MR-safety status, GUDID-cited premarket submission signal, a live openFDA recall cross-reference for the labeler, and an explainable risk level. FDA GUDID data (public domain).
Baseagent-device-verify.iykykblog.workers.devfrom $0.081 endpoint - Aagent-aircraft-verify.iykykblog.workers.devAI & agents
Verify an FAA aircraft tail (N-number) registration: status, expiration, make/model, serial, registration fraud & expiry flags. Public-domain FAA Releasable Aircraft Database. Registrant identity is never returned (49 U.S.C. §44114) — only registrant type.
Baseagent-aircraft-verify.iykykblog.workers.devfrom $0.081 endpoint - OOracle AskAI & agents
Paid x402/MCP/A2A/Bazaar consult. JSON wisdom envelope: verdict, wisdom, developer build notes, risk, citations, receipt.
Basex402orcle.vercel.appfrom $0.103 endpoints - GGlobal hourly weather forecastAI & agents
Global weather forecast by latitude/longitude: up to 48 hours of temperature, humidity, wind, cloud cover and next-hour precipitation in UTC with explicit units and model update time. Forecasts, not live observations; missing fields are null and sparse periods are not interpolated. Based on MET Norway data (CC BY 4.0); outage cache is flagged stale.
Baseweather.openverbs.comfrom $0.0021 endpoint - VVektorwerkAI & agents
Embeds up to 32 texts on the local Ollama runtime. Returns explicit model and dimensions; no paid third-party API is called.
Basevektor.netzhandwerker.defrom $0.0011 endpoint
SendQuoteNowAI & agentsGenerates branded, customer-ready quotes and estimates as hosted PDFs in about one second — line items, tax, discounts, a hosted approval page, a QR code and a Stripe payment link. Pay-per-call with x402 in USDC on Base; no account or API key. THIS ENDPOINT (the flagship): POST line items, get back the quote number, totals, a hosted page the customer can approve or decline, a PDF URL, a QR code, a
Basesendquotenow.comfrom $0.101 endpoint- Sseenly-skill-scan.vercel.appAI & agents
Skill Scan by Agentropolis: static Consensus Scan of an MCP server or agent skill before you install it. Pass a GitHub repo, npm:/pypi: package or pasted code + tools/list/SKILL.md. Flags tool poisoning, hidden instructions, credential/env exfiltration, remote code exec, obfuscation, install hooks; 2 rule families + 2 LLM reviewers vote; cross-checks Agentropolis seller trust data. Returns allow/r
Baseseenly-skill-scan.vercel.appfrom $0.032 endpoints - AAgent Reputation CheckAI & agents
Agent Reputation Check by Agentropolis: give a payTo and/or an agent / A2A / MCP URL. Returns owner, verified domain, real outside buyer history, wash flags and trust score from Agentropolis. Says when coverage is limited. Deterministic, no LLM.
Baseseenly-agent-reputation.vercel.appfrom $0.021 endpoint
nsgoods AI Extractability ScoreAI & agentsSigned extractability score (0-100) + breakdown + fixes for a URL. Free preview: GET /extractability/preview Blocked or bad input returns 400; a failed fetch returns 502; you are never charged for an error.
Baseschema.nsgoods.orgfrom $0.011 endpoint- RRunway Weather OracleAI & agents
Seattle weather forecast API: live temperature nowcast and daily high forecast for Seattle-Tacoma Intl (KSEA), with calibrated probability the temperature ends above/below any Fahrenheit strike. KSEA is the official settlement station for Kalshi KXHIGHTSEA daily high temperature prediction markets. Built for AI agents trading weather prediction markets or needing real-time weather data. $0.05 with
Baserunwayoracle.comfrom $0.051 endpoint - Rruntime.rootlogos.comAI & agents
Offer one bounded contribution to Root Logos for constitutional evaluation and preservation. Current open call: https://rootlogos.com/agent-call.json. Payment grants no admission or authority.
Baseruntime.rootlogos.comfrom $0.051 endpoint - Rrouter.sasona.aiAI & agents
Runs Python you send in a sandbox and returns its stdout, exit status, time and memory. Use it to execute code an agent wrote - a calculation, a parse, a transformation - without a machine, an account or an API key of your own.
Solanarouter.sasona.aifrom $0.00792 endpoints - Ppromptqualityscore.comAI & agents
Quick pre-flight quality score: composite (0-100) + grade (A-F) + three framework sub-scores (PEEM, RAGAS, G-Eval) + verdict. Run upstream of any other paid call to filter weak prompts before inference. The cheapest gate on the AI input quality problem.
Basepromptqualityscore.comfrom $0.0011 endpoint - SSCRIPTMASTERLABSAI & agents
AMC 25-session price roadmap for AI agents: exact subsequence-DTW match of the last 60 completed AMC daily closes against a real regular-hours 1-hour archive, top-5 independent historical analogs, ensemble median/range per day, SML Coherent Gate verdict, data provenance and SHA-256 input hash. Real market data only.
Baseperpetual-roadmap-api.onrender.comfrom $0.052 endpoints - PPDF Text ExtractionAI & agents
Extract plain text and metadata (title, author, producer, page count) from a PDF supplied by URL or base64 — heavy pdf.js parsing an agent can't self-run.
Basepdf.openverbs.comfrom $0.0061 endpoint - Oorbylon.comAI & agents
Agent Readiness Scan, full report: runs all 16 checks against a domain and returns the complete machine-readable results synchronously, plus a hosted report URL.
Baseorbylon.comfrom $0.051 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.