{"id":"defb87a2-cddf-4b73-a042-a6a3f4ca1906","shortId":"thDN2e","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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/273` is labeled \"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.\n\nThe 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, the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind these endpoints is unverified. There is no OpenAPI schema, no example request/response documentation, and no detailed description of what the `/api/v1/transactions/273` endpoint specifically does.\n\nThe x402 challenge is live and well-formed: it specifies the USDC contract on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), a 300-second timeout, and accepts POST requests. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no actual content","No OpenAPI or schema available — endpoint input/output formats are unknown","The specific functionality of /api/v1/transactions/273 is unclear; 'Premium API Access' is a generic label","The breadth of advertised capabilities (AI, finance, analytics, utilities) is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/273","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/273","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation content (all doc pages return only 'Connect wallet'), no example requests or responses, and the specific purpose of the /api/v1/transactions/273 endpoint is undefined beyond the generic label 'Premium API 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'/request':13,28 '0.02':12,27,61,107 '000':101 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':230 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':217 '20':100 '300':219 '402':95 '402 payment api' '6':111 'accept':223 'access':91 'actual':174 'address':228 'advertis':117 'ai':127 'ai-inference' 'ai/ml':49 'analysi':131 'analyt':48,121 'api':5,20,37,73,90,158 'base':8,23,69,102,114,216 'base network api' 'behind':176 'broad':42 'call':4,19 'catalog':43 'categori':118 'challeng':96,203 'classif':134 'classification' 'commit':80 'connect':165 'content':171 'contract':214 'convers':150 'crawl':154 'data':47,52,120,124 'data-analytics' 'decim':112 'descript':193 'detail':192 'doc':157 'document':155,189 'embed':135 'embeddings' 'enabl':36 'endpoint':45,57,84,178,198 'estim':145 'exampl':187 'exchang':140 'export':125 'feed':139 'financ':136 'finance-data' 'finance/web3':51 'form':209 'function':175 'gas':144 'generat':151 'geocod':148 'geocoding' 'howev':152 'i.e':106 'includ':119 'infer':50 'infrastructur':147 'insight':126 'key':74 'label':88 'learn':129 'limit':77 'live':205 'low payment fee' 'lowpaymentfee.com':31 'machin':128 'metric':122 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':184 'page':156 'paid':64 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':227 'per':3,18,62 'platform':6,21,38,116 'post':224 'premium':89 'price':59,138,159 'prompt':167 'quot':143 'rate':76,141 'readm':160 'report':123 'request':63,97,225 'request/response':188 'requir':81 'return':93,162 'schema':185 'second':220 'sentiment':130 'sentiment-analysis' 'servic':55 'sinc':108 'span':46 'specif':83,199 'specifi':211 'substant':170 'summar':133 'text':132 'text-summarization' 'timeout':221 'token':142 'unit':103 'unverifi':180 'usdc':15,30,66,105,109,213 'usdc api' 'usdc-base' 'use':110 'util':54 'utility-services' 'valid':149 'via':10,25 'wallet':166 'web3':137 'well':208 'well-form':207 'x402':11,26,35,202 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"fd7d29ae-b1e1-424f-ae7f-d90a2eedf644","listingId":"defb87a2-cddf-4b73-a042-a6a3f4ca1906","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/273","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:45.298Z"}],"sources":[{"listingId":"defb87a2-cddf-4b73-a042-a6a3f4ca1906","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/273","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:45.298Z","lastSeenAt":"2026-04-23T03:31:57.271Z"}],"details":{"listingId":"defb87a2-cddf-4b73-a042-a6a3f4ca1906","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/273 \\\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":"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","source_url":"https://lowpaymentfee.com/api/v1/transactions/273"},{"claim":"Platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting reports on a per-request billing model","Using utility services like geocoding, validation, and data conversion with micropayments"],"bestFor":["Developers wanting zero-setup, pay-as-you-go API access via crypto micropayments","AI agents that can autonomously pay for API calls using x402 on Base","Projects needing low-cost, keyless access to a variety of utility and data endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Teams requiring non-crypto payment methods or fiat invoicing","High-volume production workloads where per-request pricing at $0.02 may not be cost-effective"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.364Z"},"updatedAt":"2026-04-23T03:31:57.271Z"}}