{"id":"21e7353c-097a-42aa-8fb1-81695b97f369","shortId":"Czj9G3","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/claims/2` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 listed at the same $0.02 per request price point.\n\nHowever, the specific functionality of the `/api/v1/claims/2` endpoint is not documented beyond its title \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, request/response schemas, or usage examples. Without knowing what data or service this particular endpoint returns, callers should treat it as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/v1/claims/2 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no technical content.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The broader platform lists many endpoint categories (AI, finance, analytics, etc.) but none are verified beyond the landing page text."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/2","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/claims/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation of what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/call':13,28 '0.02':12,27,78,147 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,168 'addit':185 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,82,104,167 'attach':91 'base':8,23,51,73 'beyond':163 'broader':100 'call':80 'caller':89,203 'categori':105 'challeng':67 'classif':121 'connect':180 'convers':138 'crawl':170 'crypto-paid endpoint' 'data':107,111,196 'doc':171 'document':162,187 'embed':122 'endpoint':55,141,159,201 'estim':132 'exampl':192 'exchang':127 'exploratori':209 'export':112 'feed':126 'financ':123 'function':155 'gas':131 'generat':139 'geocod':136 'header':95 'howev':152 'http-post' 'i.e':77 'includ':106 'infrastructur':134 'insight':113 'integr':210 'json-response' 'key':83 'know':194 'learn':116 'limit':86 'list':58,143 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'multipl':103 'network':9,24,52 'no-api-key' 'page':175 'particular':200 'pay':2,17,35 'pay-per-call API' 'pay-per-request':1,16,34 'payment':48,94 'per':3,18,36,79,148 'platform':6,21,39,101 'point':151 'premium':60,166 'premium API access' 'price':125,150,172 'prompt':182 'protocol':44 'quot':130 'rate':85,128 'readm':174 'report':110 'request':4,19,37,68,98,149 'request/response':188 'requir':88 'return':64,177,202 'schema':189 'sentiment':117 'servic':198 'simpli':90 'specif':54,154 'summar':120 'technic':186 'text':119 'titl':165 'token':129 'treat':205 'unit':74 'usag':191 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':135 'valid':137 'via':10,25 'wallet':181 'web3':124 'without':193 'x402':11,26,43,93 'x402 API' 'x402-payment'","prices":[{"id":"a8ec582d-83b2-4ba0-81b1-d8c3aa37fb97","listingId":"21e7353c-097a-42aa-8fb1-81695b97f369","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/claims/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:47.073Z"}],"sources":[{"listingId":"21e7353c-097a-42aa-8fb1-81695b97f369","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:47.073Z","lastSeenAt":"2026-04-24T00:31:58.782Z"}],"details":{"listingId":"21e7353c-097a-42aa-8fb1-81695b97f369","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/2 \\\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 up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/2"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/2"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments","Integrating pay-as-you-go API calls without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid endpoint access on Base"],"bestFor":["Developers who want keyless, pay-per-use API access settled in USDC on Base","AI agents that can attach x402 payment headers automatically","Users who prefer no-commitment, no-rate-limit API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request crypto payments add unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.523Z"},"updatedAt":"2026-04-24T00:31:58.782Z"}}