{"id":"88389808-7dc6-4b95-832d-8784f0dea9e6","shortId":"L4vLr6","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 `/api/v1/keys/34` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with each request.\n\nThe wider 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. The platform claims no rate limits, no minimums, and instant access.\n\nImportant caveats: the specific endpoint probed (`/api/v1/keys/34`) does not clearly map to any of the documented API categories — its purpose is ambiguous and may relate to API key generation or retrieval. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. Treat this listing as a lightweight stub until richer documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","finance","geo","utility"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","no-auth api"],"warnings":["No OpenAPI schema or detailed documentation available","The endpoint path /api/v1/keys/34 does not correspond to any documented API category — its actual function is unclear","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","No request or response examples available; input/output formats are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/34","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/34","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 meaningful documentation beyond a landing page listing. The specific endpoint path (/api/v1/keys/34) doesn't match any documented API category, making its purpose 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'/api/v1/keys/34':68,182 '/pricing':225 '/readme':227 '/request':19,38,163 '0.02':18,37,79,162 '000':83 '20':82 '6':89 'access':74,175 'account':101 'advertis':119 'ai':12,31,130 'ai-inference' 'ambigu':197 'analysi':134 'analyt':124 'api':5,24,45,73,99,192,202 'attach':107 'avail':219 'base':8,27,63,84 'base network api' 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':122,193 'caveat':177 'claim':167 'classif':137 'classification' 'clear':185 'connect':233 'content':239 'convers':154 'cost':76 'crawl':222 'crypto-quotes' 'data':11,30,123,127 'data-analytics' 'decim':90 'detail':217 'document':191,218,249 'embed':138 'embeddings' 'enabl':44 'endpoint':16,35,57,67,121,158,180 'estim':148 'exampl':214 'exchang':143 'export':128 'feed':142 'financ':13,32,139 'finance-data' 'four':120 'gas':147 'generat':155,204 'geocod':152 'geocoding' 'handl':93 'header':112 'import':176 'infrastructur':150 'insight':129 'instant':174 'key':100,203 'learn':132 'lightweight':245 'limit':170 'list':70,157,242 'low payment fee' 'lowpaymentfee.com':39 'machin':131 'map':186 'may':199 'metric':125 'micropayment api' 'minimum':172 'network':64 'no-auth api' 'offer':10,29 'openapi':210 'page':228 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,111 'per':3,22,55,80 'platform':6,25,46,118,166 'premium':72 'price':141,164 'probe':181 'prompt':235 'protocol':97 'provid':48 'purpos':195 'quot':146 'rate':144,169 'relat':200 'report':126 'request':56,115 'request/response':213 'requir':105 'retriev':206 'return':230 'richer':248 'schema':211 'sentiment':133 'sentiment-analysis' 'serverless api' 'settl':58 'share':159 'specif':66,179 'stub':246 'subscript':103 'substant':238 'summar':136 'surfac':250 'text':135 'text-summarization' 'token':145 'treat':240 'unit':85 'usdc':9,28,60,87 'usdc api' 'usdc-base' 'util':15,34,151 'utility-apis' 'valid':153 'via':94 'wallet':234 'web3':140 'wider':117 'x':110 'x-payment':109 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c6c7aa2a-9a59-4961-9422-443781ebd9dd","listingId":"88389808-7dc6-4b95-832d-8784f0dea9e6","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.246Z"}],"sources":[{"listingId":"88389808-7dc6-4b95-832d-8784f0dea9e6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.246Z","lastSeenAt":"2026-04-22T09:02:14.641Z"}],"details":{"listingId":"88389808-7dc6-4b95-832d-8784f0dea9e6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/34 \\\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 platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, no minimums, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/keys/34 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/34"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates via a single paid HTTP call","Geocoding or data validation as a utility microservice with per-request billing","Exporting analytics data or generating reports with zero subscription overhead"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers who want to avoid API key management and subscription commitments","Crypto-native applications that can settle payments in USDC on Base"],"notFor":["High-volume workloads where per-request pricing at $0.02 would be cost-prohibitive compared to bulk plans","Users who need detailed SLAs, rate-limit guarantees, or enterprise support","Applications that cannot interact with the x402 payment protocol or USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.141Z"},"updatedAt":"2026-04-22T09:02:14.641Z"}}