{"id":"076fd3a4-648f-4dcd-915a-e49afddb54ec","shortId":"X5VBAe","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/334` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main categories of APIs: 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). All endpoints use the x402 payment protocol, settling in USDC (contract `0x8335...2913`) on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, 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 detailed documentation for any endpoint. The x402 challenge for this specific endpoint confirms it is live and accepts up to 20,000 base units of USDC (i.e., $0.02) per call with a 300-second timeout.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific purpose of /api/v1/transactions/334 ('Premium API Access') is not explained anywhere","No request or response examples are available to verify what this endpoint actually returns","The broad range of claimed capabilities (AI, finance, geocoding, etc.) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/334","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/transactions/334","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation beyond the landing page listing. No OpenAPI schema, no request/response examples, and all doc pages return only 'Connect wallet'. The purpose of the specific /transactions/334 endpoint is unclear beyond its generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,210 '000':204 '0x8335':147 '20':203 '2913':148 '300':215 'accept':200 'access':90 'advertis':98 'ai':111 'ai-inference' 'ai/ml':49 'analysi':115 'analyt':48,105 'api':5,20,37,71,89,103,157 'application/json':93 'base':8,23,67,150,205 'base network api' 'base-network' 'broad':42 'call':4,19,212 'categori':101 'challeng':190 'classif':118 'classification' 'collect':43 'commit':79 'confirm':195 'connect':166 'content':172 'contract':146 'convers':134 'cost':58 'data':47,52,104,108 'data-analytics' 'detail':183 'doc':156 'document':151,184 'embed':119 'embeddings' 'enabl':36 'endpoint':45,57,82,137,187,194 'estim':129 'everi':56 'exampl':180 'exchang':124 'export':109 'extrem':153 'feed':123 'financ':120 'finance-data' 'finance/web3':51 'four':99 'gas':128 'generat':135 'geocod':132 'geocoding' 'i.e':209 'infer':50 'infrastructur':54,131 'insight':110 'json-api' 'key':72 'learn':113 'limit':75 'list':86 'live':198 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'main':100 'metric':106 'micropayment api' 'network':9,24,68 'offer':40 'openapi':176 'page':161 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':141 'per':3,18,60,211 'platform':6,21,38,97 'post':95 'premium':88 'price':122,158 'prompt':168 'protocol':142 'quot':127 'rate':74,125 'readm':160 'render':163 'report':107 'request':61 'request/response':179 'return':92 'schema':177 'second':216 'sentiment':114 'sentiment-analysis' 'settl':143 'span':46 'spars':154 'specif':81,193 'summar':117 'text':116 'text-summarization' 'timeout':217 'token':126 'unit':206 'upfront':78 'usdc':15,30,64,145,208 'usdc api' 'usdc-settlement' 'use':138 'util':55 'valid':133 'via':10,25,94 'wallet':167 'web3':121 'x402':11,26,35,140,189 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"87c7091e-03d8-4373-8d30-a14db9b0cf03","listingId":"076fd3a4-648f-4dcd-915a-e49afddb54ec","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/transactions/334","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:03.502Z"}],"sources":[{"listingId":"076fd3a4-648f-4dcd-915a-e49afddb54ec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/334","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:03.502Z","lastSeenAt":"2026-04-22T11:32:23.383Z"}],"details":{"listingId":"076fd3a4-648f-4dcd-915a-e49afddb54ec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/334 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms USDC on Base with maxAmountRequired of 20000 base units ($0.02) and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/334"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/334"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance and crypto market data on a per-request basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding, validation, and conversion via x402"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Use cases requiring low-cost micropayments per API call ($0.02)","Projects already operating on the Base network with USDC"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume use cases where per-request pricing may add up compared to subscription models"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.019Z"},"updatedAt":"2026-04-22T11:32:23.383Z"}}