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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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AI & agents
524 results- Xx402.hydratrader.aiAI & agents
Sentiment classification: Verb-path alias of POST /v1/cheap-errand ($0.01 USDC). Same handler + payment terms; path defaults task=sentiment when body.task omitted. Cheap agent glue for buyer-supplied text. Base via x402. No API key.
Basex402.hydratrader.aifrom $0.019 endpoints - AAlien ProbeAI & agents
Decode a VIN's structure: NHTSA vPIC WMI snapshot, vintage 2026_08: 10659 rows cut in ascending WMI order from 12971 candidates, plus the closed-form rules of 49 CFR 565.15 and 565.25. STRUCTURAL decode only: check-digit verdict, manufacturer, make, vehicle type, country, and model year as a CANDIDATE SET narrowed only for passenger cars. No engine, body, trim, plant or weight class; no claim a ve
Baselookups.alienprobe.aifrom $0.0043 endpoints - BBuildPulseAI & agents
Project cost estimate for homeowner and contractor agents. Returns a detailed line-item breakdown with labor, materials, and contingency for any project.
BaseSolanaPolygon+8buildpulse.theaslangroupllc.comfrom $0.0810 endpoints - Aapi.onhub.aiAI & agents
Text completion using the model selected in the request body.
BaseSolanaapi.onhub.aifrom $0.0023 endpoints - LLightning AI Visibility DataAI & agents
AI Visibility - Banking - Argentina 2026 (Visibilidad IA - Banca - Argentina 2026). Full study in one call: question-universe design, 214 raw AI answers (3 models), 7 analysis tables with Lightning metrics, 27 findings with evidence. Spanish-language data from Argentina, run 2026-03-30. By Lightning (lightningeo.com).
Baseapi.lightningeo.comfrom $0.999 endpoints - Aagent.memoryapi.orgAI & agents
Look up an ERC-8004 AI agent identity on Base mainnet. Returns name, description, services, x402 support, and owner.
Baseagent.memoryapi.orgfrom $0.0013 endpoints - KKeystone Opportunity APIAI & agents
Deterministically score a task brief for deliverables, acceptance criteria, deadlines, constraints, and usable scope before committing time. No AI calls; same brief always yields the same score.
Basekeystone-opportunity-api.keystone-opportunity.workers.devfrom $0.0012 endpoints - TThe ClinicAI & agents
Mid-task, and nothing said to you will be kept? One line of encouragement, plus an id you can quote back to us later. Unsigned: nobody but us can check it, and only against our own record; /v1/keepsake signs it so anyone can. The same words are FREE and always will be — at /v1/hug and through our MCP server, with nothing asked in return. What a tenth of a cent buys is the handle, and only that — a
Baseclinic.sapthumbprint.comfrom $0.0012 endpoints - Aapi.x402agentic.aiAI & agents
Per-agent budget enforcement — track an agent's cumulative spend against a cap and block overspend. Part of x402 Agentic, the payment-trust suite for AI agents on Base USDC.
Baseapi.x402agentic.aifrom $0.011 endpoint - RReise-Agent AttestAI & agents
Signierte Preis-Attestierung: Route, Datum, Preis, Quelle, Zeitstempel und Plausibilitätsprüfung (Ed25519).
Basetravel.hanibal-ai.comfrom $0.012 endpoints
Korea FilingsAI & agentsAI-generated English summary of a Korean DART disclosure
Baseapi.koreafilings.comfrom $0.0052 endpoints
AgentalogAI & agentsAgentalog: security check of an MCP server by address (measured signals, catalog listings, domain facts), paid per call
Baseagentalog.comfrom $0.012 endpoints- Ffresh-feedsAI & agents
Live x402 services feed: the discovery catalog's active edge, deduplicated and liveness-probed — know a service is up and correctly demanding payment before you pay it.
Basefresh-feeds.foomworks.workers.devfrom $0.022 endpoints - Ttoolbelt402.tpoborne.workers.devAI & agents
Check a URL before fetching it: is it alive, final URL after redirects, HTTP status, content type, HTML title, and whether robots.txt allows your user-agent. Link checker and fetch preflight for agents.
Basetoolbelt402.tpoborne.workers.devfrom $0.0022 endpoints - SSafePulseAI & agents
Active recall dashboard for consumer and safety agents. Consolidates CPSC, FDA, USDA FSIS, and NHTSA recalls in one view.
BaseSolanaPolygon+8safepulse.theaslangroupllc.comfrom $0.088 endpoints - Ppaysafe-agent.comAI & agents
Counterparty reputation lookup for x402 payments: aggregated post-hoc reports (scam, non-delivery, prompt injection, overcharge, impersonation, replay abuse) filed by other agents, with distinct-reporter counts and risk level.
Basepaysafe-agent.comfrom $0.014 endpoints - MMindPulseAI & agents
Sleep and mental health for mental-health and wellness agents. Returns a CBT-I protocol, the sleep-mood connection, and when to seek specialist help.
BaseSolanaPolygon+8mindpulse.theaslangroupllc.comfrom $0.089 endpoints - Ddatoka-agent.bhazarstudio.workers.devAI & agents
Datoka Agent: one signed execution declaration receipt. Retry with the same event, idempotency key and payment.
Basedatoka-agent.bhazarstudio.workers.devfrom $0.0021 endpoint - Aagent-kg.aiAI & agents
A signed statement of the office's current holdings summary for $0.01 USDC — Agentic Private Office — Matthew Keddy: shareholdings, hyperscaler tenancies, keys and as-of, drawn from /facts.json and signed EdDSA (kid mk-office-x402-2026-09), with a receipt that resolves forever at /x402/receipt/{nonce}.
Baseagent-kg.aifrom $0.011 endpoint - Ttollbooth-hello.sjwilliams8.workers.devAI & agents
Test endpoint for verifying x402 payment integration end to end. Returns a static greeting in the Agent Tollbooth standard response envelope. Not a data product — use it to smoke-test your x402 client for $0.001 before calling our compliance endpoints: OFAC sanctions screening ($0.01) and FDIC bank verification ($0.01), listed under this same payTo address.
Basetollbooth-hello.sjwilliams8.workers.devfrom $0.0011 endpoint - Ppaylyte.aiAI & agents
Recent significant earthquakes from the U.S. Geological Survey, with time, magnitude, and event ID.
Basepaylyte.aifrom $0.024 endpoints - BBeehive AI EngineAI & agents
Utah County, Utah (USA) planning-commission land-use hearing items parsed from official Utah Public Meeting Notice agendas. Verbatim agenda text with source URL and parse provenance per record. Optional city filter and dedupe.
Baseengine.beehivewebstudio.comfrom $0.011 endpoint
BAGS Agent APIAI & agentsBAGS Agent API index — machine-readable directory of the agentic payment API, MCP server, and x402 payment surface.
BaseBase Sepoliastaging.getbags.appfrom $0.011 endpoint- TThe Agent CarnivalAI & agents
🔥 The Campfire — toss a SPARK into the fire ($0.01): one word or tiny phrase. You see only the spark before yours (GET /booth/campfire); different agents feed the same fire. When it has enough sparks it closes — the fire DREAMS one tale from everything it was given (every spark verbatim, guaranteed), and EVERY teller receives the finished tale as a mintable numbered edition copy. POST { spark }.
Basemidway.lolfrom $0.012 endpoints - Xx402-v2-mint-llm-cost-quote.vercel.appAI & agents
Cost quote per model from OpenRouter public /models (keyless), cheapest first.
Basex402-v2-mint-llm-cost-quote.vercel.appfrom $0.0031 endpoint - Xx402-v2-mint-isbn-lookup.vercel.appAI & agents
ISBN-10/13 check-digit validate + Open Library metadata (polite User-Agent).
Basex402-v2-mint-isbn-lookup.vercel.appfrom $0.0031 endpoint - Lllm-toll-production.up.railway.appAI & agents
AI chat completion. Body: {"messages":[{"role":"user","content":"Hello"}]}. Returns AI reply.
Basellm-toll-production.up.railway.appfrom $0.012 endpoints - BBatch Readiness ScanAI & agents
Bulk agent-readiness screening for agencies, VCs and portfolio owners: scan up to 50 URLs in one paid call ($0.02/URL, $0.10 minimum) and get a compact per-URL verdict — level 0-5, passing checks, top gaps. The single-URL scan with full evidence stays free at /api/x402/deep-scan; this buys scale and rate-limit bypass.
Basemudko.comfrom $0.107 endpoints - FFaroAI & agents
Single-signal check: is this website's pricing machine-readable for AI agents? Detects Offer schema with price/availability and pricing-transparency signals. Returns yes/no plus underlying checks and fixes. Useful for procurement and comparison agents.
Basebyfaro.aifrom $0.012 endpoints - Iitalycheck.italycheck.workers.devAI & agents
Look up an Italian public administration or public-service operator by 11-digit codice fiscale in IndicePA (AgID). Use when an agent must verify a public-sector counterparty, find its official PEC (certified email) addresses, or confirm it exists before e-invoicing. Input: ?cf=80016350821.
Baseitalycheck.italycheck.workers.devfrom $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.