{"id":"d2260fcb-18b3-4b48-90e7-320775014a9f","shortId":"ypV9we","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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, payable in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/transactions/118` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests 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 examples of what the `/api/v1/transactions/118` endpoint actually returns. The platform's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them.","tags":[],"capabilities":["x402-payment","usdc-base","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","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) contain no usable content — only a 'Connect wallet' prompt.","No OpenAPI or schema documentation available for any endpoint.","The purpose and expected input/output of /api/v1/transactions/118 is undocumented; 'Premium API Access' is vague.","The platform lists many endpoints on its landing page but provides no detail on request parameters or response formats for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/118","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/118","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 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/transactions/118 ('Premium API Access') is unclear beyond its 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'/api/v1/transactions/118':107,201 '/docs':169 '/pricing':170 '/readme':173 '0.02':93,134 '000':123 '0x8335':128 '20':122 '2913':129 'accept':157 'access':112 'across':52 'actual':203 'ai':12,28,62 'ai-inference' 'analysi':66 'analyt':56 'api':5,21,39,111,145 'application/json':163 'base':8,24,101,124,131 'base network api' 'broad':44 'call':4,20 'catalog':45 'categori':54 'challeng':118 'classif':69 'classification' 'commit':153 'connect':179 'content':185 'convers':86 'conversion' 'cover':10,26 'crypto-quotes' 'data':11,27,55,59 'data-analytics' 'detail':216 'document':164,194 'embed':70 'embeddings' 'enabl':38 'endpoint':16,32,51,89,105,156,202,212 'equal':133 'estim':80 'exact':141 'exampl':197 'exchang':75 'export':60 'extrem':166 'feed':74 'financ':13,29,71 'finance-data' 'format':222 'four':53 'gas':79 'gas-estimates' 'generat':87 'geocod':84 'geocoding' 'http':158 'infrastructur':82 'insight':61 'key':146 'label':109 'land':208 'learn':64 'limit':149 'list':210 'live':116 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':63 'made':137 'mani':211 'metric':57 'micropayment api' 'network':102 'offer':42 'openapi':189 'page':174,209 'paramet':219 'pay':2,18,48 'pay per call api' 'pay-per-cal':1,17 'pay-per-request':47 'payabl':96 'payment':135 'per':3,19,49,94 'platform':6,22,40,206 'post':159 'premium':110 'price':73,91 'prompt':181 'provid':214 'quot':78 'rate':76,148 'render':176 'report':58 'request':50,95,119,160,218 'request/response':192 'requir':154 'respons':221 'return':114,162,204 'schema':193 'scheme':142 'sentiment':65 'sentiment-analysis' 'spars':167 'spec':190 'specif':104 'summar':68 'text':67 'text-summarization' 'token':77 'unit':125 'upfront':152 'usdc':9,25,98,127 'usdc api' 'usdc-base' 'util':15,31,83 'valid':85 'validation' 'via':138 'wallet':180 'web3':72 'x402':37,117,140 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"e2fc75f1-44c0-458d-a7a4-030ddaf3915e","listingId":"d2260fcb-18b3-4b48-90e7-320775014a9f","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:32.196Z"}],"sources":[{"listingId":"d2260fcb-18b3-4b48-90e7-320775014a9f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/118","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:32.196Z","lastSeenAt":"2026-04-22T13:31:45.163Z"}],"details":{"listingId":"d2260fcb-18b3-4b48-90e7-320775014a9f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/118 \\\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 a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/118"},{"claim":"All listed endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time crypto prices, exchange rates, and gas estimates on a per-call basis","Running geocoding, validation, or data conversion tasks with micropayments","Exporting data or generating analytics reports with no subscription commitment"],"bestFor":["Agents or developers who want key-free, pay-as-you-go API access","Low-volume or sporadic API consumers who don't want subscriptions","x402-compatible agents settling payments in USDC on Base"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.796Z"},"updatedAt":"2026-04-22T13:31:45.163Z"}}