{"id":"d6612573-5fa1-42fe-bf68-76e966ca8a15","shortId":"spaj2Z","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/customers/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. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 listed at the same $0.02/request price point.\n\nHowever, the specific `/api/v1/customers/2` endpoint's purpose is unclear — it does not appear in the site's listed API catalog, and no documentation, request schema, or response schema is available for it. The docs, pricing, and other pages behind the site require a wallet connection and yielded no substantive content during crawl. Without knowing what data this endpoint returns or what input it expects, agents should treat this as a partially documented endpoint.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["data","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/v1/customers/2 is not listed in the site's own API catalog — its purpose and expected input/output are unknown.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","The nature of the 'customers' resource is unclear — it may return personal data, which could have regulatory implications."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/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/customers/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint does not appear in the site's own catalog. Docs pages returned only 'Connect wallet' with no useful content. This is effectively a stub 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92 'across':108 'advertis':83 'agent':219 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,173 'appear':167 'attach':95 'avail':184 'base':8,23,51,73 'behind':193 'broader':104 'call':4,19,80 'catalog':174 'categori':110 'challeng':67 'classif':125 'connect':199 'content':204 'convers':142 'crawl':206 'crypto-paid API' 'data':111,115,210 'doc':188 'document':177,226 'embed':126 'endpoint':55,107,145,159,212,227 'estim':136 'exchang':131 'expect':218 'export':116 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'geocod':140 'header':99 'howev':155 'http-post' 'i.e':77 'infrastructur':138 'input':216 'insight':117 'instant':91 'json-response' 'key':86 'know':208 'learn':120 'limit':89 'list':58,147,172 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'page':192 'partial':225 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60 'premium API access' 'price':129,153,189 'protocol':44 'purpos':161 'quot':134 'rate':88,132 'report':114 'request':37,68,102,178 'requir':196 'respons':181 'return':64,213 'schema':179,182 'sentiment':121 'simpli':94 'site':170,195 'specif':54,157 'substant':203 'summar':124 'text':123 'token':133 'treat':221 'unclear':163 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':198 'web3':128 'without':207 'x402':11,26,43,97 'x402 API' 'x402-payment' 'yield':201","prices":[{"id":"d5dbcac9-3e65-47dc-a37d-147ba8661c11","listingId":"d6612573-5fa1-42fe-bf68-76e966ca8a15","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/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":"2026-04-18T18:37:43.967Z"}],"sources":[{"listingId":"d6612573-5fa1-42fe-bf68-76e966ca8a15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:43.967Z","lastSeenAt":"2026-04-28T16:33:02.117Z"}],"details":{"listingId":"d6612573-5fa1-42fe-bf68-76e966ca8a15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/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/customers/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":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/2"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or customer records via a single micropayment per request","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Programmatic access to various data, AI, finance, and utility endpoints at $0.02 each"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access settled in USDC on Base","Low-friction micropayment API consumption without subscriptions or commitments","x402-compatible agent toolchains that can attach payment headers automatically"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up compared to bulk plans","Anyone without a Base-network USDC wallet or x402-capable client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.059Z"},"updatedAt":"2026-04-28T16:33:02.117Z"}}