{"id":"60250eb9-d8d9-4a43-9314-b6c842f5b603","shortId":"pSfJTB","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of 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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/accounts/105` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The exact purpose of the `/api/v1/accounts/105` endpoint is unclear beyond its \"Premium API Access\" label; it may return account information or serve as a generic access gate. Without schema details or sample responses, integrators will need to experiment to determine the request and response formats.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key","no-rate-limits"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api","crypto api access"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'","The exact purpose and expected request/response format of /api/v1/accounts/105 is undocumented","The broad catalog of endpoints listed on the homepage cannot be individually verified from the crawl","No examples or error handling documentation found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/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/accounts/105","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no useful content. The purpose of /api/v1/accounts/105 specifically is unclear. This is effectively a stub 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'/api/v1/accounts/105':120,217 '/docs':178 '/pricing':179 '/readme':182 '/request':19,38 '0.02':18,37,95,147 '000':136 '0x8335':141 '20':135 '2913':142 '300':162 '402':130 '402 payment api' '6':151 'accept':167 'access':126,225,237 'account':230 'across':54 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,107,125,224 'application/json':172 'avail':208 'base':8,27,103,137,144 'base network api' 'beyond':221 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':131 'classif':71 'classification' 'commit':115 'connect':188 'content':194 'convers':88 'crawl':211 'crypto api access' 'data':11,30,57,61 'data-analytics' 'decim':152 'detail':241 'determin':251 'document':173,203 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,118,166,218 'equal':146 'estim':82 'exact':158,213 'exampl':207 'exchang':77 'experi':249 'export':62 'extrem':175 'feed':76 'financ':13,32,73 'finance-data' 'format':256 'four':55 'gas':81 'gate':238 'generat':89 'generic':236 'geocod':86 'geocoding' 'given':148 'http':168 'inform':231 'infrastructur':84 'insight':63 'integr':245 'key':108 'label':226 'learn':66 'limit':111 'list':122 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'may':228 'metric':59 'micropayment api' 'minimum':114 'need':247 'network':104 'no-api-key' 'no-rate-limits' 'offer':48 'openapi':198 'page':183 'paid':98 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':153 'per':3,22,96 'platform':6,25,46 'post':169 'premium':124,223 'price':75,93 'prompt':190 'purpos':214 'quot':80 'rate':78,110 'render':185 'report':60 'request':97,132,253 'request/response':201 'respons':244,255 'return':128,171,229 'sampl':243 'schema':202,240 'scheme':159 'second':163 'sentiment':67 'sentiment-analysis' 'serv':233 'spars':176 'spec':199 'specif':117 'summar':70 'text':69 'text-summarization' 'timeout':164 'token':79 'unclear':220 'unit':138 'usag':206 'usdc':100,140,149 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'via':9,28,155 'wallet':189 'web3':74 'without':239 'x402':10,29,43,157 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f431162d-3017-479c-85a7-9c4d051fd5b7","listingId":"60250eb9-d8d9-4a43-9314-b6c842f5b603","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/accounts/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":"2026-04-18T18:40:40.113Z"}],"sources":[{"listingId":"60250eb9-d8d9-4a43-9314-b6c842f5b603","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/105","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:40.113Z","lastSeenAt":"2026-04-22T18:31:10.993Z"}],"details":{"listingId":"60250eb9-d8d9-4a43-9314-b6c842f5b603","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/105 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/accounts/105"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding, validation, and conversion with no subscription commitment"],"bestFor":["Developers wanting zero-friction API access without signup or API keys","Agents and bots that can settle payments in USDC on Base automatically via x402","Projects needing low-cost, pay-as-you-go access to a variety of utility and AI endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk access where per-request pricing is cost-prohibitive","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.478Z"},"updatedAt":"2026-04-22T18:31:10.993Z"}}