{"id":"f2dee82f-2a32-4ab6-b3ea-8e79c935d014","shortId":"eZ56Dr","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 subscriptions required. The specific endpoint at `/api/v1/accounts/111` 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 appear to follow the same x402 payment scheme — an exact payment of USDC on Base per call.\n\nDocumentation is extremely sparse. The docs, API, pricing, 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 usage examples available from the crawled material. The x402 challenge for this specific endpoint was successfully captured (HTTP 402 with valid accepts block), confirming the endpoint is live. The challenge specifies a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-pricing","json-api","post-method","no-api-key","pay-per-use"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless API access"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The endpoint path '/api/v1/accounts/111' is not listed in the site's public catalog — its purpose is unclear","No examples of actual API responses are available from crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/111","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/accounts/111","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 confirms pricing and payment details, but there is zero documentation beyond the landing page catalog. No OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The specific endpoint '/api/v1/accounts/111' has a generic 'Premium API Access' description with no indication of what data it 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'/request':13,28 '0.02':12,27,59,230 '20000':221 '402':205 '6':226 'Base network API' 'USDC API' 'accept':208 'access':90 'advertis':98 'ai':109 'ai/ml':49 'analysi':113 'analyt':48,103 'api':5,20,37,71,89,160 'appear':137 'application/json':93 'avail':189 'base':8,23,67,151,222 'block':209 'broad':42 'call':4,19,153 'captur':203 'catalog':43 'categori':101 'challeng':196,216 'classif':116 'confirm':210 'connect':169 'content':175 'convers':133 'cost':58 'crawl':192 'crypto-paid API' 'data':47,52,102,106 'decim':227 'doc':159 'document':154,184 'embed':117 'enabl':36 'endpoint':45,57,82,100,136,200,212 'equal':229 'estim':127 'everi':56 'exact':146 'exampl':188 'exchang':122 'export':107 'extrem':156 'feed':121 'financ':118 'finance/web3':51 'follow':139 'four':99 'gas':126 'generat':134 'geocod':131 'http':204 'infer':50 'infrastructur':129 'insight':108 'json-api' 'key':72 'learn':111 'limit':75 'list':86 'live':214 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':110 'materi':193 'maxamountrequir':219 'metric':104 'micropayment API' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':179 'page':164 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-use' 'payment':143,147 'per':3,18,60,152 'per-request-pricing' 'platform':6,21,38,97 'post':95 'post-method' 'premium':88 'price':120,161 'prompt':171 'quot':125 'rate':74,123 'readm':163 'render':166 'report':105 'request':61 'request/response':182 'requir':79 'return':92 'schema':183 'scheme':144 'sentiment':112 'serverless API access' 'servic':55 'span':46 'spars':157 'spec':180 'specif':81,199 'specifi':217 'subscript':78 'success':202 'summar':115 'text':114 'token':124 'unit':223 'usag':187 'usdc':15,30,64,149,225 'usdc-base-network' 'util':54,130 'valid':132,207 'via':10,25,94 'wallet':170 'web3':119 'x402':11,26,35,142,195 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f2b8d3c0-e11c-4236-a355-edbfaa6c3fef","listingId":"f2dee82f-2a32-4ab6-b3ea-8e79c935d014","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/accounts/111","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:42.535Z"}],"sources":[{"listingId":"f2dee82f-2a32-4ab6-b3ea-8e79c935d014","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/111","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:42.535Z","lastSeenAt":"2026-04-23T20:32:15.068Z"}],"details":{"listingId":"f2dee82f-2a32-4ab6-b3ea-8e79c935d014","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/111 \\\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 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 for /api/v1/accounts/111 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/111"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing analytics metrics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, and exchange rates","Performing utility operations like geocoding, validation, and data conversion"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications that can pay in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.317Z"},"updatedAt":"2026-04-23T20:32:15.068Z"}}