{"id":"c9bf71ff-e470-41fc-b0a5-a8434f25c153","shortId":"MFFp8Y","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/71` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 endpoints are priced at $0.02 per request and settle in USDC on Base.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/71` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond the generic label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet' with no content.","No OpenAPI or output schema describing what /api/v1/transfers/71 returns.","The label 'Premium API Access' is generic and does not describe the endpoint's actual functionality.","Cannot determine what data or service this specific endpoint provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/71","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/transfers/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages are empty. The listing is effectively a stub with only pricing and protocol metadata 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'/request':13,28 '0.02':12,27,78,145 '000':72 '20':71 '402':66 'Base network API' 'USDC API' 'accept':46 'access':62,217 'actual':192 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,82,104,161,216 'attach':91 'base':8,23,51,73,153 'beyond':219 'broader':100 'call':4,19,80 'caller':89 'categori':105 'challeng':67,204 'classif':121 'connect':169 'content':175 'convers':138 'data':107,111,212 'descript':186 'doc':159 'document':154,207 'embed':122 'endpoint':55,141,191,195 'estim':132 'exampl':183 'exchang':127 'export':112 'extrem':156 'feed':126 'financ':123 'function':214 'gas':131 'generat':139 'generic':221 'geocod':136 'header':95 'http-post' 'i.e':77 'includ':106 'infrastructur':134 'insight':113 'key':83 'label':222 'learn':116 'limit':86 'list':58 'live':197 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment API' 'multipl':103 'network':9,24,52 'no-api-key' 'openapi':179 'page':164 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,94 'per':3,18,36,79,146 'platform':6,21,39,101 'premium':60,215 'price':125,143,160 'prompt':171 'protocol':44 'provid':218 'quot':130 'rate':85,128 'readm':163 'render':166 'report':110 'request':37,68,98,147 'request/response':182 'requir':88 'respond':199 'return':64,193 'schema':180 'sentiment':117 'settl':149 'simpli':90 'spars':157 'specif':54 'summar':120 'text':119 'token':129 'unclear':210 'unit':74 'usdc':15,30,47,76,151 'usdc-base' 'use':41 'util':135 'valid':137,202 'via':10,25 'wallet':170 'web3':124 'without':206 'x402':11,26,43,93,203 'x402 API' 'x402-payment'","prices":[{"id":"f9632fad-17d1-43f6-8fd3-30df0f2b0f38","listingId":"c9bf71ff-e470-41fc-b0a5-a8434f25c153","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/transfers/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:01.460Z"}],"sources":[{"listingId":"c9bf71ff-e470-41fc-b0a5-a8434f25c153","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:01.460Z","lastSeenAt":"2026-04-22T22:01:50.198Z"}],"details":{"listingId":"c9bf71ff-e470-41fc-b0a5-a8434f25c153","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/71 \\\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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/71"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/71"}],"useCases":["Programmatic access to premium data or services with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base for per-call API access","Use cases requiring no API key signup or subscription commitment"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.39Z"},"updatedAt":"2026-04-22T22:01:50.198Z"}}