{"id":"6dc71820-44df-4ab8-8e60-3a687a7accb8","shortId":"Bqk3sG","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across 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 via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/392` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises four categories of APIs: 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, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no actual API docs, request/response schemas, or usage examples. Without documentation it is unclear what specific inputs this particular endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","No request or response schema provided for this endpoint","The purpose of '/api/v1/payments/392' ('Premium API Access') is ambiguous — it does not match any of the named endpoints on the landing page","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/392","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/payments/392","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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond the landing page, no request/response examples, and the specific purpose of the '/api/v1/payments/392' endpoint labeled 'Premium API Access' is unclear. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'/request':13,30 '0.02':12,29,63,131 '000':120 '0x8335':125 '20':119 '2913':126 '300':144 '402':114 '6':135 'Base network API' 'USDC API' 'accept':149 'access':110 'across':50 'actual':209 'advertis':157 'ai':169 'ai/ml':53 'analysi':173 'analyt':52,163 'api':5,15,22,32,41,81,109,161,210 'application/json':154 'attach':92 'base':8,25,71,121,128 'beyond':197 'broad':46 'call':4,21 'caller':90 'categori':159 'challeng':115 'classif':176 'commit':89 'connect':204 'convers':192 'cost':62 'crypto-paid API' 'data':51,56,162,166 'decim':136 'doc':211 'document':195,218 'embed':177 'enabl':40 'endpoint':49,61,102,148,227 'equal':130 'estim':187 'everi':60 'exact':141 'exampl':216 'exchang':182 'expect':228 'export':167 'feed':181 'financ':178 'finance/web3':55 'four':158 'gas':186 'generat':193 'geocod':190 'given':132 'header':96 'howev':194 'infer':54 'infrastructur':189 'input':224 'insight':168 'json-response' 'key':16,33,82 'land':199 'learn':171 'limit':85 'list':106 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':170 'metric':164 'micropayment API' 'network':72 'no-api-key' 'offer':44 'page':196,200 'paid':66 'particular':226 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':76,95,138 'per':3,20,64 'platform':6,23,42,156 'post':150 'post-method' 'premium':108 'price':180 'prompt':206 'protocol':77 'quot':185 'rate':84,183 'report':165 'request':65,99,116,151 'request/response':212 'requir':17,34 'return':112,153,201,232 'schema':213 'scheme':139 'second':145 'sentiment':172 'servic':59 'set':47 'simpli':91 'specif':101,223 'summar':175 'text':174 'timeout':146 'token':184 'unclear':221 'unit':122 'upfront':88 'usag':215 'usdc':9,26,68,124,133 'usdc-base' 'util':58 'valid':191 'via':10,27,73 'wallet':205 'web3':179 'without':217 'x402':11,28,39,75,94 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"a7d3d595-e98a-416e-aaa6-e3d211b47390","listingId":"6dc71820-44df-4ab8-8e60-3a687a7accb8","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/payments/392","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:39.261Z"}],"sources":[{"listingId":"6dc71820-44df-4ab8-8e60-3a687a7accb8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/392","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:39.261Z","lastSeenAt":"2026-04-23T04:01:33.113Z"}],"details":{"listingId":"6dc71820-44df-4ab8-8e60-3a687a7accb8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/392 \\\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 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/392"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/392"}],"useCases":["Accessing analytics metrics and reports without managing API keys","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call crypto payments","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding and data conversion utilities paid per request"],"bestFor":["Developers who want zero-friction API access without signup or key management","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer pay-as-you-go pricing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.429Z"},"updatedAt":"2026-04-23T04:01:33.113Z"}}