{"id":"cc9e1892-76e4-47de-b2d5-b851f87ff677","shortId":"jXHk7Q","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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transactions/347` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only a 'Connect wallet' prompt — no usable docs were crawled.","No OpenAPI spec or request/response schema is available; endpoint behavior must be inferred.","The purpose of /api/v1/transactions/347 specifically (vs. other endpoints) is not documented.","The breadth of advertised capabilities (AI, finance, geocoding, etc.) could not be independently verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/347","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/347","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, documentation pages all require wallet connection and yield no content, so there are no request/response schemas, no example payloads, and no detailed descriptions of what each endpoint actually returns. The specific /transactions/347 endpoint's purpose beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,59,133 '000':122 '0x8335':127 '20':121 '2913':128 '300':146 '6':137 'accept':151 'access':112 'advertis':160 'ai':172 'ai-inference' 'ai/ml':49 'analysi':176 'analyt':48,166 'api':5,20,37,71,111 'appear':201 'application/json':156 'attach':87 'avail':214 'base':8,23,67,123,130 'base network api' 'broad':42 'broader':158 'call':4,19 'caller':86 'catalog':43 'categori':164 'challeng':117 'classif':179 'classification' 'commit':78 'connect':205 'convers':195 'conversion' 'cost':58 'crawl':217 'crypto-quotes' 'data':47,52,165,169 'data-analytics' 'decim':138 'detail':209 'document':197 'embed':180 'embeddings' 'enabl':36 'endpoint':45,57,104,150,161 'equal':132 'estim':190 'everi':56 'exact':143 'exchang':185 'exist':199 'export':170 'feed':184 'financ':181 'finance-data' 'finance/web3':51 'four':163 'gas':189 'gas-estimates' 'generat':196 'geocod':193 'geocoding' 'given':134 'handl':83 'header':90 'http':93 'immedi':99 'infer':50 'infrastructur':192 'inlin':85 'insight':171 'key':72 'learn':174 'limit':75 'list':108 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':173 'metric':167 'micropayment api' 'network':9,24,68 'offer':40 'page':198 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,89,140 'per':3,18,60 'platform':6,21,38,159 'post':152 'premium':110 'price':183 'protocol':82 'quot':188 'rate':74,186 'receiv':96 'report':168 'request':61,94,118,153 'request/response':210 'requir':79,203 'respons':98 'return':114,155 'schema':211 'scheme':141 'second':147 'sentiment':175 'sentiment-analysis' 'servic':55 'settlement':101 'span':46 'specif':103 'summar':178 'text':177 'text-summarization' 'timeout':148 'token':187 'unit':124 'upon':100 'usdc':15,30,64,126,135 'usdc api' 'usdc-base-network' 'util':54 'valid':194 'validation' 'via':10,25 'view':207 'wallet':204 'web3':182 'x402':11,26,35,81,116 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ebbafa66-445f-47df-b4d0-7b42ef6e5419","listingId":"cc9e1892-76e4-47de-b2d5-b851f87ff677","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/347","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:25.266Z"}],"sources":[{"listingId":"cc9e1892-76e4-47de-b2d5-b851f87ff677","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/347","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:25.266Z","lastSeenAt":"2026-04-22T18:32:35.279Z"}],"details":{"listingId":"cc9e1892-76e4-47de-b2d5-b851f87ff677","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/347 \\\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 an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/347"},{"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 endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/347"}],"useCases":["Querying real-time crypto price feeds and gas estimates without an API key","Running sentiment analysis or text summarization on demand with per-call USDC payment","Exporting data or generating analytics reports via pay-as-you-go endpoints","Geocoding addresses or validating data through utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing lightweight access to multiple API categories without subscription overhead"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users without USDC on the Base network or an x402-compatible client","Applications requiring detailed SLAs, guaranteed uptime, or dedicated support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.007Z"},"updatedAt":"2026-04-22T18:32:35.279Z"}}