{"id":"27b79b74-5139-4dc0-9338-ba8e84bf0785","shortId":"E2zC37","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/73` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four categories of APIs: 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 specific functionality behind the `/api/v1/keys/73` endpoint is unclear from available documentation. The description \"Premium API Access\" and the path segment `/keys/73` suggest it may be an API key provisioning or access-granting endpoint rather than a data endpoint, but no schema, request/response examples, or detailed documentation were found. The site's non-root pages (pricing, README, API docs) all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No API documentation, OpenAPI spec, or request/response schema available","The specific functionality of /api/v1/keys/73 ('Premium API Access') is unclear — it may be a key provisioning endpoint rather than a data API","All documentation pages (pricing, README, API) returned only 'Connect wallet' with no content","No examples of successful responses are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/73","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/73","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 documentation, no request/response schema, and the specific purpose of /api/v1/keys/73 is ambiguous. Non-root pages returned no useful content. Effectively a stub 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'/keys/73':181 '/request':19,38,158 '0.02':18,37,80,157 '000':84 '20':83 '402 payment API' '6':90 'Base network API' 'USDC API' 'access':75,176,192 'access-gr':191 'advertis':113 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,74,93,117,175,187,219 'attach':103 'avail':170 'base':8,27,63,85 'base-network' 'behind':163 'broad':50 'call':4,23 'caller':101 'catalog':51 'categori':115 'classif':132 'connect':225 'content':231 'convers':149 'cost':77 'data':11,30,118,122,198 'data-analytics' 'decim':91 'descript':173 'detail':206 'doc':220 'document':171,207 'embed':133 'enabl':44 'endpoint':16,35,57,67,153,166,194,199 'estim':143 'exampl':204 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'finance-data' 'found':209 'four':114 'function':162 'gas':142 'generat':150 'geocod':147 'grant':193 'header':107 'infrastructur':145 'insight':124 'key':94,188 'learn':127 'limit':96 'list':71,152 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':126 'may':184 'metric':120 'micropayment API' 'network':64 'no-api-key' 'non':214 'non-root':213 'offer':10,29 'page':216 'path':179 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':106 'per':3,22,55,81 'platform':6,25,46,112 'premium':73,174 'price':136,159,217 'prompt':227 'provid':48 'provis':189 'quot':141 'rate':95,139 'rather':195 'readm':218 'report':121 'request':56,82,110 'request/response':203 'requir':100 'return':222 'root':215 'schema':202 'segment':180 'sentiment':128 'settl':58 'share':154 'simpli':102 'site':211 'specif':66,161 'subscript':98 'substant':230 'suggest':182 'summar':131 'text':130 'token':140 'unclear':168 'unit':86 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,146 'utility-services' 'valid':148 'wallet':226 'web3':135 'x402':43,105 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"246f789d-16b7-4e14-ad29-06108fee11ff","listingId":"27b79b74-5139-4dc0-9338-ba8e84bf0785","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.914Z"}],"sources":[{"listingId":"27b79b74-5139-4dc0-9338-ba8e84bf0785","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.914Z","lastSeenAt":"2026-04-22T01:02:19.365Z"}],"details":{"listingId":"27b79b74-5139-4dc0-9338-ba8e84bf0785","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/73 \\\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 requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/73"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reporting endpoints without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time financial data such as token prices, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion with instant pay-per-use billing"],"bestFor":["Agents or developers who want zero-commitment, pay-as-you-go API access","Use cases requiring low-cost micropayments per API call ($0.02)","Crypto-native workflows already operating on the Base network with USDC"],"notFor":["High-volume use cases where per-request pricing may add up compared to flat-rate plans","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.021Z"},"updatedAt":"2026-04-22T01:02:19.365Z"}}