{"id":"6659af2b-0d5b-4d6c-a424-6dc9eb97ac7e","shortId":"gUFUfB","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 an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/117` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises 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 (geocoding, validation, conversion, generation). However, documentation pages beyond the landing page are essentially empty (showing only \"Connect wallet\"), so the actual functionality, request/response schemas, and data sources behind each endpoint are undocumented. Without schemas or example responses, it is unclear what data or computation this specific endpoint provides — the name \"Premium API Access\" and path segment \"transfers/117\" give no concrete indication of the resource's purpose.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet' with no content.","The purpose of '/api/v1/transfers/117' ('Premium API Access') is completely undocumented; the path and title give no indication of what data or service is provided.","No request or response schemas are available; integration requires trial-and-error.","The broad catalog of endpoints listed on the homepage cannot be verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/117","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/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no documentation, no request/response schema, and no indication of what 'Premium API Access' at '/api/v1/transfers/117' actually returns. All doc pages are empty stubs. The listing is essentially a stub with pricing info 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'/request':13,28 '0.02':12,27,64,118 '000':112 '20':111 '300':133 '402':106 '6':122 'Base network API' 'USDC API' 'accept':138 'access':102,230 'account':76 'actual':198 'advertis':147 'ai':157 'ai/ml':49 'analysi':161 'analyt':48,151 'api':5,20,37,74,101,229 'application/json':143 'attach':84 'base':8,23,71,113,125 'base-network' 'behind':205 'beyond':185 'broad':42 'broader':145 'call':4,19 'caller':82 'catalog':43 'categori':148 'challeng':107 'classif':164 'comput':221 'concret':237 'connect':194 'convers':180 'crypto-paid API' 'data':47,52,150,154,203,219 'decim':123 'document':183 'embed':165 'empti':191 'enabl':36 'endpoint':45,57,94,137,207,224 'essenti':190 'estim':175 'exact':130 'exampl':213 'exchang':170 'export':155 'feed':169 'financ':166 'finance/web3':51 'function':199 'gas':174 'generat':181 'geocod':178 'give':235 'header':88 'howev':182 'i.e':117 'includ':149 'indic':238 'infer':50 'infrastructur':177 'insight':156 'json-response' 'key':75 'land':187 'learn':159 'limit':79 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':158 'metric':152 'micropayment API' 'name':227 'network':9,24,72 'no-api-key' 'offer':40 'page':184,188 'path':232 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':59 'payment':87,127 'per':3,18,61 'platform':6,21,38,146 'post':139 'post-method' 'premium':100,228 'price':168 'provid':225 'purpos':243 'quot':173 'rate':78,171 'report':153 'request':62,91,108,140 'request/response':200 'requir':81 'resourc':241 'respons':214 'return':104,142 'schema':201,211 'scheme':128 'second':134 'segment':233 'sentiment':160 'servic':55 'settl':66 'show':192 'simpli':83 'sinc':119 'sourc':204 'span':46 'specif':93,223 'summar':163 'text':162 'timeout':135 'token':172 'transfers/117':234 'unclear':217 'undocu':209 'unit':114 'usdc':15,30,68,116,120 'usdc-settlement' 'use':121 'util':54 'valid':179 'via':10,25 'wallet':195 'web3':167 'without':210 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"764764f9-a261-49af-a576-c716e325e61f","listingId":"6659af2b-0d5b-4d6c-a424-6dc9eb97ac7e","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/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:20.376Z"}],"sources":[{"listingId":"6659af2b-0d5b-4d6c-a424-6dc9eb97ac7e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/117","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:20.376Z","lastSeenAt":"2026-04-23T05:01:49.029Z"}],"details":{"listingId":"6659af2b-0d5b-4d6c-a424-6dc9eb97ac7e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/117 \\\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 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/117"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/117"}],"useCases":["Accessing pay-per-call API endpoints without needing API keys or subscriptions","Making low-cost programmatic requests settled in USDC on Base","Agent-driven workflows that need on-demand API access with crypto payments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.402Z"},"updatedAt":"2026-04-23T05:01:49.029Z"}}