{"id":"35eb5db8-4090-4128-8d9f-b2e4e9d288e0","shortId":"jrFChA","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 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/3` 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 — callers 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 priced at $0.02 per request.\n\nNote that the specific `/api/v1/customers/3` endpoint's purpose is unclear — it sits under a \"customers\" path that doesn't appear in the site's public API catalog. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl (docs, pricing, and API pages all returned only a \"Connect wallet\" prompt). The endpoint is live and responds with a valid x402 challenge, but the actual data it returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The /api/v1/customers/3 endpoint does not appear in the site's publicly listed API catalog — its actual function is unknown.","No OpenAPI spec or detailed documentation was found; docs/pricing/API pages all render only a 'Connect wallet' prompt.","No request body schema or response schema is available — callers cannot know what to send or what to expect back.","The platform appears to be a demo or early-stage project; treat with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/3","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/3","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 challenge, but there is no OpenAPI schema, no documentation beyond a landing page catalog, no request/response examples, and the specific /api/v1/customers/3 path is not listed in the site's public catalog. The purpose of this particular endpoint is 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'/request':13,30 '0.02':12,29,82,153 '000':76 '20':75 '402':70 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,96 'across':112 'actual':221 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,181,199 'appear':175 'attach':99 'base':8,25,55,77 'broader':108 'call':4,21,84 'caller':97 'catalog':182 'categori':114 'challeng':71,218 'classif':129 'connect':205 'convers':146 'crawl':195 'crypto-paid API' 'custom':170 'data':115,119,222 'detail':189 'doc':196 'document':190 'doesn':173 'embed':130 'endpoint':59,111,149,161,209 'estim':140 'exampl':187 'exchang':135 'export':120 'feed':134 'financ':131 'found':192 'four':113 'gas':139 'generat':147 'geocod':144 'header':103 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'json-response' 'key':16,33,90 'learn':124 'limit':93 'list':62 'live':211 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'network':56 'no-api-key' 'note':156 'offer':110 'openapi':184 'page':200 'path':171 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,102,226 'per':3,20,40,83,154 'platform':6,23,43,86,109 'post-method' 'premium':64 'price':133,151,197 'prompt':207 'protocol':48 'public':180 'purpos':163 'quot':138 'rate':92,136 'report':118 'request':41,72,106,155 'request/response':186 'requir':17,34 'respond':213 'return':68,202,224 'schema':185 'sentiment':125 'simpli':98 'sit':167 'site':178 'specif':58,159 'summar':128 'text':127 'token':137 'unclear':165 'unit':78 'unknown':228 'usdc':9,26,51,80 'usdc-base-network' 'use':45 'util':143 'valid':145,216 'via':10,27 'wallet':206 'web3':132 'x402':11,28,47,101,217 'x402 API' 'x402-payment'","prices":[{"id":"7e958a64-7a6c-4073-a5f7-4746b2924a83","listingId":"35eb5db8-4090-4128-8d9f-b2e4e9d288e0","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:25.780Z"}],"sources":[{"listingId":"35eb5db8-4090-4128-8d9f-b2e4e9d288e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:25.780Z","lastSeenAt":"2026-04-25T01:32:00.878Z"}],"details":{"listingId":"35eb5db8-4090-4128-8d9f-b2e4e9d288e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/3 \\\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/3"},{"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/3"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data endpoints without traditional API key management","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key signup and subscription commitments","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic API consumers who prefer per-call pricing"],"notFor":["High-volume consumers who need bulk/subscription pricing","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.872Z"},"updatedAt":"2026-04-25T01:32:00.878Z"}}