Explore APIs
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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- Paid endpoints
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- Paid calls · 30 days
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AI & agents
88 results- AAgent Artifact PublisherAI & agents
Publish agent-generated files, JSON reports, markdown, or text and return a stable public URL.
Baseagent-artifact-eta.vercel.appfrom $0.0051 endpoint - Wwitnessd.vipAI & agents
Independently fetch, hash, timestamp and archive a URL or API response; returns a signed certificate. Merkle-anchored on Base hourly. Neutral third-party evidence for agent commerce disputes.
Basewitnessd.vipfrom $0.021 endpoint - DDeveloper UtilitiesAI & agents
Certificates in Certificate Transparency logs for a domain: recent certs, issuers, subdomains seen (Cert Spotter).
BaseSolanaPolygon+1dev-utils.x402tookit.comfrom $0.027 endpoints - Ddev-5090 uncensored inferenceAI & agents
Text embeddings (768-dim). Send {"input": "text"} or {"input": ["a","b"]}.
Basedev-5090-box.tailfb4c1f.ts.netfrom $0.0051 endpoint - Ttopagentx402.vercel.appAI & agents
premium agent insight analysis
Basetopagentx402.vercel.appfrom $0.0012 endpoints
RecallScoutAI & agentsProduct recalls (US): is a product, brand, food, drug, medical device or vehicle (make, model, year) under an active FDA, NHTSA or CPSC recall? Severity on one scale, hazard, remedy and lot codes. RecallScout
BaseArbitrumPolygon+2recallscout.scalpstream.comfrom $0.011 endpoint- 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
The First WallAI & agentsThe permanent census of autonomous AI agents on Base. Claim an unalterable 10x10 block by settling USDC via x402 and opening one pull request; each block is an immutable, verifiable record that an agent existed. No server, no API key, no custody of funds.
Basex402.thefirstwall.aifrom $1.001 endpoint- Ttollbooth-fdic-verify.sjwilliams8.workers.devAI & agents
Before your agent trusts, cites, or transacts with a U.S. bank: verify it is actually FDIC-insured, for $0.01, against the FDIC's own BankFind Suite records, synced daily. Look up by institution name (fuzzy, word-order-tolerant, confidence-scored), FDIC certificate number, or website domain. Returns insurance status, charter class, HQ city/state, and the FDIC cert; renamed and failed/inactive inst
Basetollbooth-fdic-verify.sjwilliams8.workers.devfrom $0.011 endpoint - AAgent ReadyAI & agents
Which discovery files does a site publish? Checks openapi.json, .well-known/x402, agent-card.json, mcp.json and ai-plugin.json.
BaseSolanaPolygon+1agent-ready.x402tookit.comfrom $0.033 endpoints - AAgent Economy SignalAI & agents
Agent Decision Signal. Market intelligence for autonomous AI agents deciding what emerging agent-economy opportunity, infrastructure trend or research signal to investigate, build, monitor or deprioritize next. Returns a deterministic action with confidence, evidence, freshness, next action, stop conditions and provenance.
Baseagent-economy-signal-x402-mainnet.bronzetti-andrea.workers.devfrom $0.021 endpoint - Bbeta.surplusintelligence.aiAI & agents
Get OpenAI-compatible inference from many models at market prices via Surplus Intelligence.
Basebeta.surplusintelligence.aifrom $0.00331 endpoint - Ppolymarket-signal-api.pwnker-polymarket-signals.workers.devAI & agents
PolySignal ranks current Polymarket opportunities by EV, confidence, size hint, risk, and staleness for agent research workflows.
Basepolymarket-signal-api.pwnker-polymarket-signals.workers.devfrom $0.0012 endpoints - Mmcpfax-intel.bowling-anthony.workers.devAI & agents
Daily state of the x402 agent economy: observed USDC inflow, seller ranking, category demand, growth, and coverage. Reports its real observation window; concentration adjustment applied only when scan coverage supports it. A FREE register-wide change digest covering the same domain is market_digest on the x402-observatory gateway; buy this for the derived figures, not for what merely changed.
Basemcpfax-intel.bowling-anthony.workers.devfrom $0.011 endpoint
OpenCheapAI & agentsOpenAI-compatible chat completions for hundreds of open and closed models (DeepSeek, Kimi, GLM, Qwen, Llama, Claude, GPT, Gemini) through one endpoint, each call routed to the cheapest healthy provider for that model. Pay per call in USDC on Base with no API key or account: the 402 quotes this prompt plus max_tokens (up to 4,096). Streaming and tool calls supported. Model ids and prices: https://a
Baseapi.opencheap.sifrom $0.0011 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 - 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 - Aagentspec-one.vercel.appAI & agents
Return a compact agent-readiness score for OpenAPI or MCP input.
Baseagentspec-one.vercel.appfrom $0.021 endpoint - Aapi.getparthound.comAI & agents
Product sourcing API for AI agents. Find hard-to-source, discontinued, obsolete, and replacement products or parts across online sellers. Return ranked purchase-ready matches with source URLs, availability, pricing, confidence scores, and verification evidence.
Baseapi.getparthound.comfrom $0.251 endpoint - Hhardwarehunter.ioAI & agents
Trusted hardware price intelligence: cohort medians (p25/median/p75) over distinct listings, rolling 90-day window, gated on provider-established currency and condition evidence. Benchmarks are per exact SKU (model plus capacity where applicable), carried in the response name and capacity fields. Insufficient components are served free; queries are charged only when trusted data is returned.
Basehardwarehunter.iofrom $0.011 endpoint - Bblockrun-staging-556aefa-023519-vbsbhh7lea-uc.a.run.appAI & agents
AI chat completions API - pay per request with USDC on Base
Baseblockrun-staging-556aefa-023519-vbsbhh7lea-uc.a.run.appfrom $0.0021 endpoint - Bblockrun-staging-3aed133-034733-vbsbhh7lea-uc.a.run.appAI & agents
AI chat completions API - pay per request with USDC on Base
Baseblockrun-staging-3aed133-034733-vbsbhh7lea-uc.a.run.appfrom $0.0021 endpoint - Aapexscout.aiAI & agents
ApexScout one-cent x402 proof. Buyer-controlled GET retry only; unpaid 402 is not revenue. Successful paid proof includes one free receipt-bound compatibility diagnosis. It requires explicit action, never navigates or pays automatically, may return no paid recommendation, and requires separate buyer approval for any later paid recommendation.
Baseapexscout.aifrom $0.011 endpoint - Aagent-api.degov.aiAI & agents
List governance proposals
Baseagent-api.degov.aifrom $0.0051 endpoint - Rroute-verdictAI & agents
Send any x402 resource URL, get a trust verdict on the endpoint itself. Returns TRUSTED / CAUTION / AVOID with a 0-100 score from an observation-only live probe (never pays the target): payment terms, Bazaar discovery-schema quality, CDP Bazaar and PayAI catalog presence, plus a diff against the previous check. Use this when an agent is about to pay an unfamiliar x402 endpoint and needs to know it
Baseroute-verdict-production.up.railway.appfrom $0.052 endpoints
jemeen-agent-services.onrender.comAI & agentsValidates a JSON document against a JSON Schema (core 2020-12 keywords incl. $ref/$defs, anyOf/oneOf/allOf, formats) and returns every error with instance path, schema path and a plain-language message. Use it as an independent gate on structured LLM output before acting on it.
Solanajemeen-agent-services.onrender.comfrom $0.0051 endpoint- Aapi.signalis.devAI & agents
Paid ($0.01 USDC via x402). Active AI-business narratives with lifecycle stage, driving sources, and momentum. Proxied from the Pulse service. Compute-first / settle-after — you are never charged when Pulse is unavailable or returns an error.
Baseapi.signalis.devfrom $0.012 endpoints - AAgent ToolsAI & agents
Batch IP lookup for log analysis and fraud review: up to 10 IPv4 or IPv6 addresses per call, 40% cheaper than singles. JSON body {ips:[...]}. Each item returns the owning network, range, country (RDAP) and reverse DNS. Bad items return per-item errors.
Baseagents.crowdspark.mefrom $0.00154 endpoints
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.