{"id":"58178670-9d6b-47cc-abca-b2184832a51c","shortId":"fS3BP6","kind":"x402","title":"Pay-per-call customer data API on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call customer data API on Base via x402, settled in USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-request APIs accessible via the x402 protocol on the Base network. The specific endpoint `/api/v1/customers/5` is described as \"Premium API Access\" and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which at 6 decimals equals $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\n\nThe broader platform advertises 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\nThe specific `/api/v1/customers/5` endpoint does not clearly map to any of the advertised categories, and no documentation, request schema, or response schema is available beyond the x402 challenge. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no further content. Callers should expect a JSON response but the exact fields and request body format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","customer-data"],"categories":["data","api-infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","customer endpoint","premium API access"],"warnings":["No request or response schema available — callers must discover the expected body format experimentally","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","The /api/v1/customers/5 endpoint is not listed among the site's advertised APIs; its actual functionality is unknown","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/5","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/5","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 with clear pricing, but there is no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The purpose of the /customers/5 endpoint is unclear and doesn't match any advertised category. Effectively a stub 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'/request':17,34,164 '0.02':16,33,91,163 '000':83 '0x8335':73 '20':82 '2913':74 '6':88 'Base network API' 'USDC micropayment API' 'access':45,63 'across':120 'advertis':118,179 'ai':130 'amount':80 'analysi':134 'analyt':124 'api':7,24,44,62,95,199 'attach':106 'avail':190 'base':9,26,52,76,84 'base-network' 'beyond':191 'bodi':227 'broader':116 'call':4,21 'caller':104,215 'categori':122,180 'challeng':194 'classif':137 'clear':173 'collect':38 'commit':101 'connect':208 'content':214 'contract':72 'convers':154 'custom':5,22 'customer endpoint' 'customer-data' 'data':6,23,123,127 'decim':89 'describ':59 'doc':196 'document':183 'embed':138 'endpoint':56,119,157,170 'equal':90 'estim':148 'exact':223 'exchang':143 'expect':217 'export':128 'feed':142 'field':224 'financ':139 'format':228 'four':121 'gas':147 'generat':155 'geocod':152 'header':110 'host':36 'infrastructur':150 'insight':129 'json':66,219 'json-response' 'key':96 'learn':132 'limit':98 'list':159 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':131 'map':174 'maximum':79 'metric':125 'network':53 'no-api-key' 'page':200 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':67,109 'per':3,20,42,92 'platform':117 'point':166 'post':113 'premium':61 'premium API access' 'price':141,165,197 'prompt':210 'protocol':49 'quot':146 'rate':97,144 'render':205 'report':126 'request':43,93,114,184,226 'requir':103 'respons':187,220 'return':65 'schema':185,188 'sentiment':133 'settl':12,29,69 'simpli':105 'site':203 'specif':55,168 'summar':136 'text':135 'token':145 'unit':85 'unknown':230 'upfront':100 'usdc':14,31,71 'usdc-settlement' 'util':151 'valid':153 'via':10,27,46 'wallet':209 'web3':140 'x402':11,28,48,108,193 'x402 API' 'x402-payment'","prices":[{"id":"f075080f-d301-492b-b876-a36287cf4f91","listingId":"58178670-9d6b-47cc-abca-b2184832a51c","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:23.761Z"}],"sources":[{"listingId":"58178670-9d6b-47cc-abca-b2184832a51c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:23.761Z","lastSeenAt":"2026-04-29T08:34:14.575Z"}],"details":{"listingId":"58178670-9d6b-47cc-abca-b2184832a51c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/5 \\\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 x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/5"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/5"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching customer data records on demand with per-call USDC micropayments","Integrating pay-as-you-go data access into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 protocol payments","Agents needing keyless, pay-per-call data access on Base","Low-volume consumers who want no subscription or commitment"],"notFor":["High-volume bulk data retrieval where per-call fees add up","Users who need detailed API documentation and guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.053Z"},"updatedAt":"2026-04-29T08:34:14.575Z"}}