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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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4,150 results- 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
DomainHelpDeveloper toolsTri-state domain registration availability intelligence
Baseapp.domainhelp.comfrom $0.0013 endpoints- Vvitrineretirement.caData & research
One Canadian retirement residence's record from the Vitrine Retirement Index: Vitrine's score, band and rank, counts and dates of regulator records, and links.
Basevitrineretirement.cafrom $0.101 endpoint - Zzoll.halowerk.comCrypto & DeFi
Matches declared classification tokens against a supplied published dual-use control list. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. This is neither legal advice nor customs advice.
Basezoll.halowerk.comfrom $0.0038 endpoints - PParty & Event PlannerOther services
Tip and even bill split in exact cents: tip on subtotal or total, shares that add up, optional round up to whole dollars.
BaseSolanaPolygon+1party-event-calc.x402tookit.comfrom $0.029 endpoints - NNumber WordsDeveloper tools
Write a money amount in words for a cheque (EN/ES/FR/DE): you give the currency names, no rates; words or 56/100 cents.
BaseSolanaPolygon+1number-words.x402tookit.comfrom $0.029 endpoints - MMusic Production CalcImages, audio & video
Camelot wheel code for a musical key and its harmonic-mixing matches; optionally test if two keys mix.
BaseSolanaPolygon+1music-production-calc.x402tookit.comfrom $0.029 endpoints - MMarket and Holiday CalendarMarkets & finance
Is a date a public holiday in a country? Also whether it is a business day and the next holiday after it.
BaseSolanaPolygon+1market-calendar.x402tookit.comfrom $0.029 endpoints - LLicense IntelSearch & web
Check a list of license ids against SPDX: current, deprecated or unknown, with the modern GNU -only / -or-later form.
BaseSolanaPolygon+1license-intel.x402tookit.comfrom $0.029 endpoints - JJSON and Data ToolsDeveloper tools
Parse CSV text (quotes, escaped quotes, embedded commas and newlines) into JSON rows, detecting the delimiter.
BaseSolanaPolygon+1json-data-tools.x402tookit.comfrom $0.029 endpoints - IIdentifier ValidatorsData & research
Validate a 9-character CUSIP security identifier check digit and split issuer and issue codes.
BaseSolanaPolygon+1id-validators.x402tookit.comfrom $0.029 endpoints - HHome Energy CalculatorsCrypto & DeFi
Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.
BaseSolanaPolygon+1home-energy-calc.x402tookit.comfrom $0.029 endpoints - FFinance CalculatorsMarkets & finance
Break-even units and revenue from fixed costs, unit price and unit variable cost, plus profit at a target volume.
BaseSolanaPolygon+1finance-calculators.x402tookit.comfrom $0.029 endpoints - FFile Format InspectorImages, audio & video
Compare a file name's extension with its real type from the first bytes; flags executables disguised as documents or images.
BaseSolanaPolygon+1file-formats.x402tookit.comfrom $0.029 endpoints - DDomain and DNS ChecksDeveloper tools
CAA records for a domain (walking up to parent names): which CAs may issue certificates, wildcard rules and reporting contacts.
BaseSolanaPolygon+1domain-dns.x402tookit.comfrom $0.029 endpoints - AAviation CalculatorsOther services
Density altitude from field elevation, altimeter setting and temperature, exact and by rule of thumb, with a performance flag.
BaseSolanaPolygon+1aviation-calc.x402tookit.comfrom $0.029 endpoints - Llauf.halowerk.comData & research
Distinct from route/matrix: assigns jobs to up to four vehicles and orders visits at a common depot, reports arrival/wait/service/return times, capacity usage and unassigned jobs. Consumes caller travel-time matrix, including durations_s from HALOWERK route/matrix, avoiding a duplicate routing API or invented road data. Deterministic earliest-deadline cheapest-feasible-insertion heuristic; no glob
Baselauf.halowerk.comfrom $0.0068 endpoints - SShipping & Logistics CalcOther services
How many identical boxes fit inside a larger box or crate: best of six orientations in a simple grid, with utilization.
BaseSolanaPolygon+1shipping-calc.x402tookit.comfrom $0.028 endpoints - IIslamic Prayer TimesOther services
High-precision Islamic prayer times (fajr, sunrise, dhuhr, asr, maghrib, isha) plus qibla direction for any coordinates and date. Pure astronomical computation (adhan library), 11 calculation methods including Umm al-Qura, Dubai, Egyptian, MWL. Ideal for agents building Muslim-facing schedules, reminders, or travel plans.
Baseapi.qist.infofrom $0.012 endpoints - Aapi.arcgate.devCrypto & DeFi
Swap quote
EVM chain 5042Baseapi.arcgate.devfrom $0.00513 endpoints
WebberSites x402 Data APISearch & webFetch any public web page and return clean, readable Markdown with navigation, ads, and boilerplate stripped. For agents that need article text or documentation as Markdown.
Basex402-data-api.onrender.comfrom $0.0012 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 - FFindPulseMarkets & finance
Best product for my use case, what should I buy, product finder by need, product recommendation. For shopping and buyer agents: takes a use case plus optional budget and preferences and returns the top product picks for that specific need, with honest trade-offs and sourcing links.
BaseSolanaPolygon+8findpulse.theaslangroupllc.comfrom $0.0513 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
ProblocksOther servicesVerify payment connectivity with USDC on Base. Returns a JSON pong and UTC timestamp after settlement.
Basex402.problocks.iofrom $0.0011 endpoint- Eenrichmatch.devSocial & people
Apollo.io Verified B2B Person Enrichment & Work Email Finder ($0.03 USDC on Match — Free on Miss)
Baseenrichmatch.devfrom $0.031 endpoint - DDataForAgentsSearch & web
DataForAgents — Steam catalog search for agents (name, genre, price filters)
Basedataforagents.netfrom $0.013 endpoints
searchMarkets & financeFull-text search across every aggregated data source in one call: news, SEC filings, court opinions, academic papers, government records, and developer discussions. One query surfaces everything concordant across independently-sourced, citable results -- not a single-source wrapper. Optional source/category/since filters.
BaseSolanaconcordancehq.duckdns.orgfrom $0.014 endpoints- AAgentWireAI & agents
AgentWire service card for webhook inbox relay and web fetch infrastructure.
Basecdp-agent-0-01.onrender.comfrom $0.0011 endpoint - BBase Token SafetyCrypto & DeFi
Base ERC-20 check before an agent buys or holds a token. Input: one contract address. Output: allow, warn, or block. Block: not a contract, not an ERC-20, zero supply, or the owner or token contract holds at least 50 percent. Warn: 20 to 50 percent held, proxy (EIP-1967, EIP-1167, or implementation()), or bytecode contains mint or pause. A selector does not prove the public can call it. Concentrat
Basebase-token-check.fly.devfrom $0.013 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.