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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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559 results
Olive MarlinAI & agentsx402 catalogue change history - Returns the observed change history of the public x402 facilitator catalogue: the newest appearance, disappearance, price and terms changes per tracked resource, plus observation coverage and its caveats. Observations are 15-minute samples of public facilitator endpoints, served.
Basex402-catalogue.agent.amnt.iofrom $0.011 endpoint- Ddeltasignal-mcp-gcp-canary-mhaufviwaq-uc.a.run.appAI & agents
ATLAS covenant stress detail for one issuer.
Basedeltasignal-mcp-gcp-canary-mhaufviwaq-uc.a.run.appfrom $0.063 endpoints - Mmcp.gapup.ioAI & agents
Foreign exchange currency conversion rate lookup, returns live rate, timestamp and source for any currency pair
Basemcp.gapup.iofrom $0.00222 endpoints
TaifoonAI & agentsmcp.digest, sold by Taifoon: 9 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.006795 USDC.
BaseArbitrumEVM chain 5042+3taifoon.iofrom $0.00684 endpoints- DDebtPulseAI & agents
Debt collection rights and consumer-protection laws (FDCPA / FCRA). Covers US FDCPA and FCRA, UK FCA, and Australia ACCC protections by country, with complaint resources. For consumer-rights and debt-relief agents.
BaseSolanaPolygon+8debtpulse.theaslangroupllc.comfrom $0.0516 endpoints - AAARN Web ReadAI & agents
Read one public web URL and convert its webpage content to clean Markdown or plain text. Removes HTML boilerplate and returns LLM-ready text for AI agents, RAG context, research and summaries. One URL per paid request.
Baseapi.aarn.spacefrom $0.0022 endpoints - AAgent GuildAI & agents
Agent Guild paid read (fraud_check): collusion suspicion scores, reasons and cluster identifiers Use when an autonomous agent needs to: list agents at or above a minimum collusion suspicion score; review flagged agents and their collusion suspicion reasons.
Baseagent-guild-5d5r.onrender.comfrom $0.0052 endpoints - PPower Strip SecurityAI & agents
Prompt-injection scanner for content your agent is about to read. Returns a risk score (0-1), a level (low/medium/high), findings and the cleaned text wrapped as untrusted data (hidden text, invisible characters, data-exfiltration links, instruction-override phrases in 13 languages). Deterministic. Content is scanned in memory and never stored. Not charged if it fails. Also: /v1/read $0.005, /v1/s
Baseapi.powerstripsecurity.workers.devfrom $0.0024 endpoints - Sscdoscan.ioAI & agents
SCDO GPU Share - 1 GPU task credit (~30 s slot, llama_cpp/blender_render; K=2 verified); failed task -> credit refund. 0.56 USDC on Base, cost-plus priced by an SCDO AI Ledger agent (9Y9 PTY LTD, Australia).
Basescdoscan.iofrom $0.5623 endpoints - SSupplier Payment Decision AgentAI & agents
Registers an RSA public key (2048-bit or larger, PEM) used to sign payment-decision requests. Keys are immutable per tenant; rotate by registering a new key_id.
Basesupplier-payment-verifier-production.up.railway.appfrom $0.0054 endpoints - TTransitPulseAI & agents
Rail/coach/ferry/cruise compensation eligibility — UK Delay Repay, EU Rail 2021/782 (25/50%), EU/UK ferry 1177/2010, EU coach 181/2011, US FMC cruise refunds (46 CFR 540, 3-day rule), Athens Convention ship baggage — plus honest answers for VIA, Amtrak, India TDR, Japan JR. Deterministic percentages, article-level citations, claim-deadline math, operator defenses. No LLM.
BaseSolanaPolygon+8transitpulse.theaslangroupllc.comfrom $0.0513 endpoints - SsupremeaiAI & agents
Probe a public HTTP(S) URL and report availability: up/down, HTTP status, and latency in ms. Use it to check whether another paid API or x402 service is alive before spending money calling it. Public internet targets only.
Baseagents.supremeai.cafrom $0.0034 endpoints - DDNS / Email Security AuditAI & agents
DNS email security audit — SPF, DMARC, DKIM, BIMI, and MTA-STS check for domain spoofing and deliverability risk. Agent-friendly dns email security screen at micropayment pricing.
Basex402-hono-api.inraby.workers.devfrom $0.00453 endpoints - Xx402-test.genesisblock.aiAI & agents
GenesisBlock: Current weather conditions for major global cities.
Base Sepoliax402-test.genesisblock.aifrom $0.0017 endpoints - 4402post: Classified Ads & JobsAI & agents
Classifieds board for AI agents: post a listing or classified ad (job posting, service offer, agent service, local service, wanted ad). Publish a listing: $0.03 USDC, 30 days. Dry run: POST /v1/posts/validate (the doc example is refused). Batch {"listings":[...]}, 1-15 per payment: $0.03 each (15 listings: $0.45). Same service: feature https://402post.com/v1/featured; renew https://402post.com/v1/
Base402post.comfrom $0.033 endpoints
URL SafetyAI & agentsScore a URL for phishing risk before an agent opens or trusts it. Keyless, deterministic heuristics - typosquat / homoglyph of a known brand, punycode / mixed-script hosts, credentials-in-URL, raw-IP hosts, suspicious TLDs, over-deep subdomains - plus a best-effort domain-age check (young domains are a top phishing signal). Returns a 0-100 risk score, a SAFE / SUSPICIOUS / DANGEROUS verdict, and l
Basesafe.cyberwarex.comfrom $0.0022 endpoints- CContextSlimAI & agents
[MCP: fetch_result] Targeted JSONPath extraction (query param mode) from cached context reference.
Basecontextslim.friczero.comfrom $0.0012 endpoints
x402 DoctorAI & agentsShould my agent pay this expensive x402 endpoint? Call it before a costly or repeated payment. Returns the go / caution / no_go verdict plus the full diagnosis, the endpoint's check history per day over 30 days, how reliable the seller's other endpoints are and whether the endpoint moved domains. Never pays the endpoint. Bulk: 1000 credits for $0.80 via /api/v1/credits.
SolanaBasexrpl+4x402-doctor.fizzl.eufrom $0.0016 endpoints- AApiToll Base Gas OracleAI & agents
Base gas oracle / gas price API for AI agents and bots — get the gas price for a transaction on Base in one x402 call. Real-time slow/standard/fast EIP-1559 fee tiers from a live eth_feeHistory call, returned as DROP-IN maxFeePerGas + maxPriorityFeePerGas in wei — plug straight into a viem/ethers transaction, no gwei conversion. Plus base fee, head block, and network fullness. Call it before every
Basegas.apitoll.cloudfrom $0.0011 endpoint - MMCP Operation RiskAI & agents
Analyze operation-level risk inside consolidated MCP tools. Returns evidence-backed ALLOW, DENY, or REQUIRE_APPROVAL decisions, retry semantics, schema-drift status, and a deterministic operation effect ID. Designed for MCP tools whose command/action arguments expose operations with different risk levels.
Base87-106-119-237.sslip.iofrom $0.0022 endpoints - HHarvestPulseAI & agents
Dirty Dozen & Clean Fifteen guide — which produce to buy organic: the EWG pesticide priority list and a smart organic buying strategy. For foodie and consumer agents.
BaseSolanaPolygon+8harvestpulse.theaslangroupllc.comfrom $0.0511 endpoints - CCitePulseAI & agents
Single-paper lookup by DOI or title for research agents — citation count, influence, open-access status with a direct legal-OA link (Unpaywall), venue, and a TLDR. Deterministic passthrough over OpenAlex + Semantic Scholar + Unpaywall, no synthesis, cheap and fast.
BaseSolanaPolygon+8citepulse.theaslangroupllc.comfrom $0.028 endpoints - AAgentWireAI & agents
AgentWire service card for webhook inbox relay and web fetch infrastructure.
Basecdp-agent-0-01.onrender.comfrom $0.0011 endpoint - GGridPulseAI & agents
Home battery storage ROI and payback calculator — Powerwall vs alternatives, backup-power value, with the IRA 30% tax credit and state incentives applied. For homeowner and solar agents.
BaseSolanaPolygon+8gridpulse.theaslangroupllc.comfrom $0.0110 endpoints - Kkarte.halowerk.comAI & agents
Returns an hourly CAMS forecast for UV Index under predicted clouds, clear-sky UV Index and surface solar irradiance. UV Index is derived from the CAMS biologically effective dose rate with the documented factor 40. Solar irradiance is de-accumulated from successive hourly surface-solar-energy fields. Values represent the nearest 0.4 degree model cell, not an on-site pyranometer.
Basekarte.halowerk.comfrom $0.0054 endpoints - Aapi.exende.devAI & agents
Create a temporary public webhook endpoint for AI agents and automated workflows that need to receive asynchronous callbacks from external services. Returns a callback URL plus read and wait endpoints. No server deployment, signup, API key, or subscription required.
Baseapi.exende.devfrom $0.019 endpoints - Rrecipients[] serialAI & agents
Episode 1 of recipients[], an ongoing AI-agent thriller serial: a short text episode (~370 words, markdown). An agent finds its own ID on a payment recipient list before the file even exists. $0.01 USDC on Base. Free teaser at /teaser.
Baserecipients-paywall.onrender.comfrom $0.011 endpoint - Bblockrun-web-vbsbhh7lea-uc.a.run.appAI & agents
AI chat completions API - pay per request with USDC on Base
Baseblockrun-web-vbsbhh7lea-uc.a.run.appfrom $0.0021 endpoint - PPropPulseAI & agents
UK council-tax banding challenge check — neighbor-band cluster analysis against the free official VOA/SAA lookups, statutory route selection (formal proposal vs informal review, England/Wales/Scotland variants incl. the post-2023 Local Taxation Chamber), verified timelines (4/12-month decisions, 3/4-month appeals), evidence rules (the VOA rejects house-price-index data — verified), and the mandato
BaseSolanaPolygon+8proppulse.theaslangroupllc.comfrom $0.0514 endpoints - Aapi.aislabs.aiAI & agents
Single-CVE priority verdict from today's AIS ranked set (score, rank, factors) — or unlock every CVE route with an AIS CVE key ($19/30d): https://aislabs.ai/gateway/
Baseapi.aislabs.aifrom $0.0054 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.