{"id":"e94429eb-0446-4570-b8bc-13d50f6a5363","shortId":"LbyBE3","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/105` 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. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/105` endpoint actually returns. The endpoint name \"Premium API Access\" is generic and does not clarify its function. Without documentation or example payloads, it is unclear what data or service this specific endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API access","Base network API","micropayment API","lowpaymentfee","402 payment protocol"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of /api/v1/transfers/105 ('Premium API Access') is not explained anywhere","No examples of request bodies or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/105","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC per request on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The purpose of the specific /transfers/105 endpoint is entirely unclear, making this effectively a stub 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC API access' 'accept':46 'access':62,92,202 'across':108 'actual':195 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,162,201 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'categori':110 'challeng':67 'clarifi':208 'classif':125 'connect':171 'convers':142 'data':111,115,220 'descript':189 'detail':178 'doc':161 'document':156,212 'embed':126 'endpoint':55,107,145,194,198,225 'estim':136 'exampl':186,214 'exchang':131 'export':116 'extrem':158 'feed':130 'financ':127 'four':109 'function':210 'gas':135 'generat':143 'generic':204 'geocod':140 'header':99 'howev':155 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'learn':120 'limit':89 'list':58,147 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'name':199 'network':9,24,52 'no-api-key' 'offer':106 'openapi':182 'page':166 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payload':215 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60,200 'price':129,153,163 'prompt':173 'protocol':44 'provid':226 'quot':134 'rate':88,132 'readm':165 'render':168 'report':114 'request':37,68,102 'request/response':185 'return':64,196 'schema':183 'sentiment':121 'servic':222 'simpli':94 'specif':54,224 'summar':124 'technic':177 'text':123 'thin':159 'token':133 'unclear':218 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':172 'web3':128 'without':211 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"b97429d6-9729-4513-862e-439c21cf226b","listingId":"e94429eb-0446-4570-b8bc-13d50f6a5363","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:19.175Z"}],"sources":[{"listingId":"e94429eb-0446-4570-b8bc-13d50f6a5363","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/105","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:19.175Z","lastSeenAt":"2026-04-23T05:01:48.983Z"}],"details":{"listingId":"e94429eb-0446-4570-b8bc-13d50f6a5363","quickStartSnippet":"# Send a POST with an x402 payment header (USDC on Base)\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/105 \\\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/105"},{"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":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.444Z"},"updatedAt":"2026-04-23T05:01:48.983Z"}}