{"id":"29529fcf-bf50-4c2b-a425-e55e2a714830","shortId":"Er6avq","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 specific endpoint at `/api/v1/customers/59` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four endpoint 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 follow the x402 payment protocol — callers send an `X-PAYMENT` header containing a signed USDC payment on Base, and the server fulfills the request upon verification.\n\nThe probe confirmed the endpoint is live, returning a proper 402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or JSON schema available for any endpoint","Documentation pages (/docs, /pricing, /api, /README) contain no substantive content — only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/customers/59 is undocumented","The endpoint path '/customers/59' suggests a resource-specific route; its general utility is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/59","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/customers/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response payloads, and no meaningful documentation — all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/customers/59 ('Premium API Access') is unclear beyond its 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'/request':13,28 '0.02':12,27,59,191 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':197 '0x8335':184 '20000':179 '300':200 '402':174 '402 payment api' '6':187 'access':90 'address':196 'advertis':98 'ai':109 'ai-inference' 'ai/ml':49 'analysi':113 'analyt':48,103 'api':5,20,37,71,89,219 'application/json':93 'base':8,23,67,155,180,186 'base network api' 'broad':42 'call':4,19 'caller':142 'catalog':43 'categori':101 'challeng':175 'classif':116 'classification' 'commit':78 'confirm':166 'connect':227 'contain':149 'content':233 'convers':133 'cost':58 'crawl':215 'data':47,52,102,106 'data-analytics' 'decim':188 'detail':206 'doc':217 'document':207 'embed':117 'embeddings' 'enabl':36 'endpoint':45,57,82,100,136,168 'equal':190 'estim':127 'everi':56 'exampl':209 'exchang':122 'export':107 'feed':121 'financ':118 'finance-data' 'finance/web3':51 'follow':137 'found':212 'four':99 'fulfil':159 'gas':126 'generat':134 'geocod':131 'geocoding' 'header':148 'infer':50 'infrastructur':129 'insight':108 'json-api' 'key':72 'learn':111 'limit':75 'list':86 'live':170 'low payment fee' 'lowpaymentfee.com':31 'machin':110 'maxamountrequir':177 'metric':104 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':204 'page':222 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':140,147,153,192 'per':3,18,60 'platform':6,21,38,97 'post':95 'premium':88 'price':120,218 'probe':165 'prompt':229 'proper':173 'protocol':141 'quot':125 'rate':74,123 'readm':221 'render':224 'report':105 'request':61,161 'requir':79 'respons':210 'return':92,171 'schema':205 'second':201 'send':143 'sent':194 'sentiment':112 'sentiment-analysis' 'server':158 'servic':55 'sign':151 'span':46 'specif':81 'substant':232 'summar':115 'text':114 'text-summarization' 'timeout':202 'token':124 'unit':181 'upon':162 'usdc':15,30,64,152,183 'usdc api' 'usdc-base-network' 'util':54,130 'valid':132 'verif':163 'via':10,25,94 'wallet':228 'web3':119 'x':146 'x-payment':145 'x402':11,26,35,139 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f47178d6-05b5-4f7a-85aa-9bbeb84f8bfa","listingId":"29529fcf-bf50-4c2b-a425-e55e2a714830","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/customers/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:39.131Z"}],"sources":[{"listingId":"29529fcf-bf50-4c2b-a425-e55e2a714830","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:39.131Z","lastSeenAt":"2026-04-22T23:00:55.473Z"}],"details":{"listingId":"29529fcf-bf50-4c2b-a425-e55e2a714830","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/59 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/59"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting reports with per-request USDC micropayments","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing quick access to diverse API categories without signup"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.047Z"},"updatedAt":"2026-04-22T23:00:55.473Z"}}