{"id":"8bc738cf-5319-4c7b-9c59-82768b651dcd","shortId":"PyxJhm","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/181` is listed as \"Premium API Access\" and returns a standard x402 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transfers/181`) is labeled \"Premium API Access\" but its actual functionality is unclear — the description is generic and no OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Callers should be aware that the endpoint's concrete behavior is undocumented beyond its title.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","USDC pay-per-call","Base network API","micropayment API","lowpaymentfee","low payment fee API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint name 'Premium API Access' is generic; actual functionality is unknown","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content","No request body schema or response format documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/181","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/181","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 on Base), but there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages all show only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/transfers/181 is entirely 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'/request':13,28 '0.02':12,27,80,156 '000':74 '20':73 '402':68 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,94,167 'across':114 'actual':170 'advertis':85 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,61,87,166,193 'attach':97 'awar':209 'base':8,23,51,75 'behavior':215 'beyond':218 'broader':110 'call':4,19,82 'caller':95,206 'categori':116 'challeng':69 'classif':131 'concret':214 'connect':199 'content':205 'convers':148 'data':117,121 'descript':175 'detail':185 'doc':190 'document':186 'embed':132 'endpoint':55,113,151,161,212 'estim':142 'exampl':183 'exchang':137 'export':122 'feed':136 'financ':133 'found':188 'four':115 'function':171 'gas':141 'generat':149 'generic':177 'geocod':146 'header':102 'http-post' 'i.e':79 'infrastructur':144 'insight':123 'instant':93 'key':88 'label':164 'learn':126 'limit':91 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':125 'metric':119 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':112 'openapi':180 'page':194 'particular':160 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,101,107 'per':3,18,36,81,157 'platform':6,21,39,84,111 'premium':60,165 'price':135,154,191 'prompt':201 'proof':108 'protocol':44 'quot':140 'rate':90,138 'report':120 'request':37,70,158 'request/response':182 'return':64,196 'schema':181 'sentiment':127 'simpli':96 'specif':54 'standard':66 'substant':204 'summar':130 'text':129 'titl':220 'token':139 'unclear':173 'undocu':217 'uniform':153 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':145 'valid':105,147 'via':10,25 'wallet':200 'web3':134 'x':100 'x-payment':99 'x402':11,26,43,67,106 'x402 API' 'x402-payment'","prices":[{"id":"b892171f-0ec0-4a36-9138-941188448d1c","listingId":"8bc738cf-5319-4c7b-9c59-82768b651dcd","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/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:49.390Z"}],"sources":[{"listingId":"8bc738cf-5319-4c7b-9c59-82768b651dcd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:49.390Z","lastSeenAt":"2026-04-23T00:32:30.567Z"}],"details":{"listingId":"8bc738cf-5319-4c7b-9c59-82768b651dcd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/181 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/transfers/181"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled 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-signup, no-API-key access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Applications requiring known, well-documented response schemas","Non-crypto callers who cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.985Z"},"updatedAt":"2026-04-23T00:32:30.567Z"}}