{"id":"3cc73865-2bd1-4203-8896-985c993949e9","shortId":"65D4wY","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":"This endpoint at lowpaymentfee.com provides premium API access to a customer resource (customer ID 91) via the x402 payment protocol. It accepts HTTP POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint probed (/api/v1/customers/91) is not explicitly listed on the landing page's catalog, so its exact response schema and purpose are unclear beyond the generic \"Premium API Access\" description. Documentation pages (/docs, /pricing, /README) returned only a wallet-connect prompt with no substantive content, so detailed request/response schemas, field definitions, and usage examples are unavailable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","json-response","http-post","customer-data"],"categories":["data","api-infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","customer endpoint","lowpaymentfee","premium data access"],"warnings":["The /api/v1/customers/91 endpoint is not listed in the site's public API catalog — its purpose and response format are unknown.","All documentation pages (/docs, /pricing, /README) returned no substantive content, only a wallet-connect prompt.","No OpenAPI spec, request schema, or response schema is available.","No information on rate limits, uptime guarantees, or data freshness is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/91","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/91","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 402 challenge, confirming it works. However, the specific /customers/91 resource is not documented on the site, no response schema or example is available, and all documentation pages returned only a wallet-connect stub with no content. The listing is essentially a stub with pricing and protocol details 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'/docs':192 '/pricing':193 '/readme':194 '/request':17,34 '0.02':16,33,86,145 '000':81 '0x8335':73 '20':80 '2913':74 '6':91 '91':49 'Base network API' 'USDC micropayment API' 'accept':56 'access':42,188 'advertis':97 'ai':114 'analysi':118 'analyt':108 'api':7,24,41,105,150,187 'base':9,26,68,82 'base-network' 'beyond':183 'broader':94 'call':4,21,104 'catalog':173 'classif':121 'commit':158 'connect':200 'content':205 'contract':72 'convers':138 'cost':78 'custom':5,22,45,47 'customer endpoint' 'customer-data' 'data':6,23,107,111 'decim':92 'definit':211 'descript':189 'detail':207 'document':190 'embed':122 'endpoint':36,141,161 'equal':85 'estim':132 'exact':176 'exampl':214 'exchang':127 'explicit':166 'export':112 'feed':126 'field':210 'financ':123 'gas':131 'generat':139 'generic':185 'geocod':136 'http':57 'http-post' 'id':48 'infrastructur':134 'insight':113 'json':62 'json-response' 'key':151 'land':170 'learn':116 'limit':154 'list':143,167 'lowpaymentfee' 'lowpaymentfee.com':38,95 'machin':115 'maximum':77 'metric':109 'minimum':157 'network':69 'page':171,191 'pay':2,19,102 'pay-per-cal':1,18,101 'pay-per-call API' 'payment':53,63 'per':3,20,87,103,146 'per-call-pricing' 'platform':96 'post':58 'premium':40,186 'premium data access' 'price':125 'probe':162 'prompt':201 'protocol':54 'provid':39 'purpos':180 'quot':130 'rate':128,153 'report':110 'request':59,88,147 'request/response':208 'resourc':46 'respons':177 'return':61,195 'schema':178,209 'sentiment':117 'settl':12,29,65 'span':106 'specif':160 'substant':204 'suit':99 'summar':120 'text':119 'token':129 'unavail':216 'unclear':182 'unit':83 'usag':213 'usdc':14,31,71,89 'usdc-settlement' 'use':70,90 'util':135 'valid':137 'via':10,27,50 'wallet':199 'wallet-connect':198 'web3':124 'x402':11,28,52 'x402 API' 'x402-payment'","prices":[{"id":"79ff021e-08e8-45e6-8a51-dc250a633074","listingId":"3cc73865-2bd1-4203-8896-985c993949e9","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:23.120Z"}],"sources":[{"listingId":"3cc73865-2bd1-4203-8896-985c993949e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:23.120Z","lastSeenAt":"2026-04-29T08:05:17.888Z"}],"details":{"listingId":"3cc73865-2bd1-4203-8896-985c993949e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/91 \\\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 x402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/customers/91"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/91"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers 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-request USDC micropayments","Integrating pay-as-you-go data access into agent workflows without API key management","Demonstrating x402 protocol payment flows on the Base network"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents needing keyless, on-demand API access settled in USDC","Low-volume or sporadic data retrieval where subscription pricing is wasteful"],"notFor":["High-volume bulk data retrieval where per-call costs add up quickly","Use cases requiring detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.077Z"},"updatedAt":"2026-04-29T08:05:17.888Z"}}