{"id":"d1e450e0-3515-4dda-af22-fec71c587813","shortId":"fWg3k6","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/69` 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\nNote that this specific endpoint (`/api/v1/customers/69`) does not have a clear description of what data it returns beyond \"Premium API Access.\" There is no OpenAPI schema, no documented request/response format, and the crawled docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. The actual functionality behind this endpoint is unclear from available materials.","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 API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, API, and README pages all render only 'Connect wallet' with no useful content","The specific purpose and response format of /api/v1/customers/69 is unknown","No example request or response bodies could be determined from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/69","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the docs pages are empty. The purpose of this specific endpoint (/api/v1/customers/69) is undocumented. This is effectively a stub 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'/request':13,30,156 '0.02':12,29,82,155 '000':76 '20':75 '402':70 '402 payment API' 'Base network API' 'USDC API' 'accept':50 'access':66,96,179 'across':112 'actual':209 'addit':206 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,178,195 'attach':99 'avail':217 'base':8,25,55,77 'behind':211 'beyond':176 'broader':108 'call':4,21,84 'categori':114 'challeng':71 'classif':129 'clear':169 'connect':201 'content':207 'convers':146 'crawl':191 'data':115,119,173 'descript':170 'doc':192 'document':186 'embed':130 'endpoint':59,111,149,163,213 'estim':140 'exchang':135 'export':120 'feed':134 'financ':131 'format':188 'four':113 'function':210 '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':62,151 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'materi':218 'metric':117 'micropayment API' 'network':56 'no-api-key' 'note':159 'offer':110 'openapi':183 'page':196 'pay':2,19,39 'pay per call API' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,102 'per':3,20,40,83 'platform':6,23,43,86,109 'point':158 'post-method' 'premium':64,177 'price':133,157,193 'prompt':203 'protocol':48 'quot':138 'rate':92,136 'render':198 'report':118 'request':41,72,106 'request/response':187 'requir':17,34 'return':68,175 'schema':184 'sentiment':125 'simpli':98 'specif':58,162 'summar':128 'text':127 'token':137 'unclear':215 'unit':78 'usdc':9,26,51,80 'usdc-base-network' 'use':45 'util':143 'valid':145 'via':10,27 'wallet':202 'web3':132 'x402':11,28,47,101 'x402 API' 'x402-payment'","prices":[{"id":"8b8d7311-b9bd-4daf-909f-63d4bdd006dd","listingId":"d1e450e0-3515-4dda-af22-fec71c587813","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:46.914Z"}],"sources":[{"listingId":"d1e450e0-3515-4dda-af22-fec71c587813","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:46.914Z","lastSeenAt":"2026-04-25T01:32:01.859Z"}],"details":{"listingId":"d1e450e0-3515-4dda-af22-fec71c587813","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl (you need an x402 client library to generate the header):\ncurl -X POST https://lowpaymentfee.com/api/v1/customers/69 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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/69"},{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/69"},{"claim":"Categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","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","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agent-based systems that need keyless, per-call API access","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume bulk data retrieval where per-call costs add up quickly","Use cases requiring detailed API documentation or guaranteed SLAs","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.769Z"},"updatedAt":"2026-04-25T01:32:01.859Z"}}