{"id":"d3c17109-501e-413d-be6d-f9d9c226d5f7","shortId":"WhDMMR","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/77` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing.\n\nThe `/api/v1/keys/77` endpoint specifically is labeled \"Premium API Access\" but its actual functionality is unclear from the available documentation — no OpenAPI schema, request/response examples, or detailed docs were found. The site's non-root pages (pricing, README, API docs) all resolve to a minimal \"Connect wallet\" prompt, providing no additional technical detail. Callers should be aware that the concrete behavior of this endpoint is undocumented beyond its title.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The actual functionality behind 'Premium API Access' at /api/v1/keys/77 is undocumented","All documentation pages (pricing, README, API) resolve to a minimal 'Connect wallet' page with no content","Request and response formats are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/77","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/keys/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond the endpoint title. The actual functionality of /api/v1/keys/77 is unknown, making this effectively a stub 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'/request':19,38,162 '0.02':18,37,79,95,161 '000':85 '20':84 '6':92 'access':74,172 'actual':175 'addit':214 'advertis':118 'ai':12,31,129 'analysi':133 'analyt':123 'api':5,24,45,73,97,171,202 'attach':108 'avail':181 'awar':220 'base':8,27,63,86 'base network api' 'base-network' 'behavior':224 'beyond':230 'broad':50 'call':4,23,81 'caller':106,217 'catalog':51 'categori':121 'classif':136 'commit':103 'concret':223 'connect':209 'convers':153 'cost':76 'cover':10,29 'data':11,30,122,126 'decim':93 'detail':189,216 'doc':190,203 'document':182 'embed':137 'enabl':44 'endpoint':16,35,57,67,120,157,166,227 'equal':94 'estim':147 'exampl':187 'exchang':142 'export':127 'feed':141 'financ':13,32,138 'found':192 'four':119 'function':176 'gas':146 'generat':154 'geocod':151 'header':112 'infrastructur':149 'insight':128 'key':98 'label':169 'learn':131 'limit':100 'list':70,156 'low payment fee' 'lowpaymentfee.com':39 'machin':130 'maxamountrequir':82 'metric':124 'micropayment api' 'minim':208 'network':64 'no-api-key' 'no-rate-limits' 'non':197 'non-root':196 'offer':48 'openapi':184 'page':199 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':111 'per':3,22,55,80 'platform':6,25,46,117 'premium':72,170 'premium api access' 'price':140,163,200 'prompt':211 'provid':212 'quot':145 'rate':99,143 'readm':201 'report':125 'request':56,115 'request/response':186 'requir':105 'resolv':205 'root':198 'schema':185 'sentiment':132 'settl':58 'share':158 'simpli':107 'site':194 'specif':66,167 'summar':135 'technic':215 'text':134 'titl':232 'token':144 'unclear':178 'undocu':229 'unit':87 'upfront':102 'usdc':9,28,60,89 'usdc api' 'usdc-settlement' 'util':15,34,150 'valid':152 'wallet':210 'web3':139 'x402':43,110 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1bcea14e-8ace-4b17-94f2-388d789488c4","listingId":"d3c17109-501e-413d-be6d-f9d9c226d5f7","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/keys/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.885Z"}],"sources":[{"listingId":"d3c17109-501e-413d-be6d-f9d9c226d5f7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.885Z","lastSeenAt":"2026-04-22T01:02:19.328Z"}],"details":{"listingId":"d3c17109-501e-413d-be6d-f9d9c226d5f7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/77 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/77"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/77"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing to register or manage API keys","Agent-driven workflows that need on-demand API access settled via crypto micropayments","Testing x402 payment flows against a live endpoint on Base"],"bestFor":["Developers wanting zero-friction, keyless API access via x402","AI agents that can autonomously pay for API calls using USDC on Base","Prototyping x402 payment integrations at low cost ($0.02/call)"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods (no fiat/card option available)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.124Z"},"updatedAt":"2026-04-22T01:02:19.328Z"}}