{"id":"5c9e66d6-a6c6-4c24-8aaf-cfd52be51b53","shortId":"pQD6X7","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 upfront commitments. The specific endpoint at `/api/v1/transactions/84` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main categories of APIs: (1) Data & Analytics — metrics, reports, data export, and insights; (2) AI & Machine Learning — sentiment analysis, text summarization, classification, and embeddings; (3) Finance & Web3 — price feeds, exchange rates, token quotes, and gas estimates; (4) Infrastructure — geocoding, validation, conversion, and generation utilities. All endpoints follow the x402 payment protocol, where callers attach an `X-PAYMENT` header containing a signed USDC payment to unlock the response.\n\nThe probe confirmed the endpoint is live, returning a proper 402 challenge with `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. Documentation pages beyond the landing page were largely empty (showing only \"Connect wallet\"), so details about request/response schemas, specific data sources, or model specifications are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per request API","USDC API","Base network API","micropayment API","crypto pay API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no usable docs available.","The specific function of /api/v1/transactions/84 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint.","No OpenAPI schema or request/response examples are provided for any endpoint.","The breadth of advertised capabilities (AI, finance, analytics, utilities) cannot be verified from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are effectively empty ('Connect wallet' only), there is no OpenAPI schema, no request/response examples, and the specific purpose of the '/api/v1/transactions/84' endpoint labeled 'Premium API Access' is unclear. The broad catalog claims cannot be 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'/request':13,28 '0.02':12,27,59,192 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':198 '1':104 '2':113 '20000':183 '3':124 '4':136 '402':178 '6':188 'Base network API' 'USDC API' 'access':90 'address':197 'advertis':98 'ai':114 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':118 'analyt':48,106 'api':5,20,37,71,89,103 'application/json':93 'attach':153 'base':8,23,67,184,200 'beyond':203 'broad':42 'call':4,19 'caller':152 'catalog':43 'categori':101 'challeng':179 'classif':121 'commit':79 'confirm':170 'connect':212 'contain':159 'convers':140 'conversion' 'cost':58 'crypto pay API' 'crypto-gas-estimates' 'data':47,52,105,109,220 'data-analytics' 'decim':189 'detail':215 'document':201 'embed':123 'empti':209 'enabl':36 'endpoint':45,57,82,145,172 'equal':191 'estim':135 'everi':56 'exchang':129 'exchange-rates' 'export':110 'feed':128 'financ':125 'finance-price-feeds' 'finance/web3':51 'follow':146 'four':99 'gas':134 'generat':142 'geocod':138 'geocoding' 'header':158 'infer':50 'infrastructur':137 'insight':112 'key':72 'land':205 'larg':208 'learn':116 'limit':75 'list':86 'live':174 'low payment fee' 'lowpaymentfee.com':31 'machin':115 'main':100 'maxamountrequir':181 'metric':107 'micropayment API' 'model':223 'network':9,24,68 'offer':40 'page':202,206 'paid':62 'pay':2,17 'pay per request API' 'pay-per-cal':1,16 'pay-per-call' 'payment':149,157,163,193 'per':3,18,60 'platform':6,21,38,97 'post':95 'premium':88 'price':127 'probe':169 'proper':177 'protocol':150 'quot':132 'rate':74,130 'report':108 'request':61 'request/response':217 'respons':167 'return':92,175 'schema':218 'sent':195 'sentiment':117 'servic':55 'show':210 'sign':161 'sourc':221 'span':46 'specif':81,219,224 'summar':120 'text':119 'token':131 'unavail':226 'unit':185 'unlock':165 'upfront':78 'usdc':15,30,64,162,187 'usdc-base' 'util':54,143 'valid':139 'validation' 'via':10,25,94 'wallet':213 'web3':126 'x':156 'x-payment':155 'x402':11,26,35,148 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"db6819ed-cf17-45ba-a36b-0a6d1e63b717","listingId":"5c9e66d6-a6c6-4c24-8aaf-cfd52be51b53","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:14.312Z"}],"sources":[{"listingId":"5c9e66d6-a6c6-4c24-8aaf-cfd52be51b53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:14.312Z","lastSeenAt":"2026-04-22T23:02:15.986Z"}],"details":{"listingId":"5c9e66d6-a6c6-4c24-8aaf-cfd52be51b53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/84 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/84"},{"claim":"Platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data or exchange rates without an API key","Running AI inference (sentiment, summarization, classification, embeddings) on a per-call basis","Accessing utility services like geocoding or data validation with micropayments","Exporting analytics data or generating insights reports"],"bestFor":["Developers who want instant API access without signup or API key management","Agents or bots that can settle USDC payments on Base per request","Low-volume or bursty workloads where pay-per-call is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.634Z"},"updatedAt":"2026-04-22T23:02:15.986Z"}}