{"id":"ceae5ad4-8de1-4b87-8d07-71b94d9ce507","shortId":"LzY9ph","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 x402-enabled API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific endpoint at `/api/v1/customers/14` is labeled \"Premium API Access\" and returns customer data as JSON via POST. Payment is handled inline using the x402 protocol on the Base network, settling in USDC (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises roughly 16 endpoints across four categories: analytics/metrics, AI inference (sentiment, summarization, classification, embeddings), financial data (price feeds, exchange rates, token quotes, gas estimates), and utility services (geocoding, validation, conversion, generation). All are priced uniformly at $0.02 per request. Documentation pages exist at /docs, /pricing, and /README but currently render only a \"Connect wallet\" prompt with no substantive technical documentation, so the exact request/response schemas for this endpoint are unknown beyond what the x402 challenge reveals (POST, application/json output).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","customer-data","pay-per-request","no-api-key","json-response"],"categories":["data","api-infrastructure"],"synonyms":["customer API","premium data access","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No substantive documentation available — /docs, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format for this endpoint","The endpoint path '/api/v1/customers/14' with a hardcoded ID is unusual; unclear if it represents a demo or a real resource","Request and response schemas are entirely unknown; integration requires trial-and-error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/14","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/14","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of the /customers/14 endpoint specifically is opaque beyond its 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'/docs':176 '/pricing':177 '/readme':179 '/request':17,34 '0.02':16,33,97,169 '000':101 '0x8335':90 '16':135 '20':100 '2913':91 '6':105 'Base network API' 'USDC micropayment API' 'access':65 'across':137 'advertis':133 'ai':48,141 'analyt':47 'analytics/metrics':140 'api':7,24,43,64,108 'application/json':210 'attach':119 'base':9,26,84,102 'base-network' 'beyond':203 'broader':131 'call':4,21 'caller':117 'categori':139 'challeng':207 'classif':145 'collect':38 'commit':114 'connect':185 'contract':89 'convers':162 'cost':95 'current':181 'custom':5,22,68 'customer API' 'customer-data' 'data':6,23,46,69,148 'decim':106 'document':172,192 'embed':146 'enabl':42 'endpoint':44,58,136,200 'estim':156 'exact':195 'exchang':151 'exist':174 'feed':150 'financ':51 'financi':147 'four':138 'gas':155 'generat':163 'geocod':160 'handl':76 'header':124 'host':36 'infer':142 'infrastructur':54 'inlin':77 'json':71 'json-response' 'key':109 'label':62 'learn':50 'limit':111 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':49 'maximum':94 'network':85 'no-api-key' 'output':211 'page':173 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':74,123,128 'per':3,20,98,170 'platform':132 'post':73,209 'premium':63 'premium data access' 'price':149,166 'prompt':187 'proof':129 'protocol':81 'quot':154 'rate':110,152 'render':182 'request':99,171 'request/response':196 'requir':116 'return':67 'reveal':208 'rough':134 'schema':197 'sentiment':143 'servic':159 'settl':12,29,86 'simpli':118 'span':45 'specif':57 'substant':190 'summar':144 'technic':191 'token':153 'uniform':167 'unit':103 'unknown':202 'upfront':113 'usdc':14,31,88 'usdc-settlement' 'use':78 'util':55,158 'valid':127,161 'via':10,27,72 'wallet':186 'web3':52 'x':122 'x-payment':121 'x402':11,28,41,80,206 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"b044afb8-89e4-43d4-b1df-2177f3c592b7","listingId":"ceae5ad4-8de1-4b87-8d07-71b94d9ce507","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:36.140Z"}],"sources":[{"listingId":"ceae5ad4-8de1-4b87-8d07-71b94d9ce507","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:36.140Z","lastSeenAt":"2026-04-29T16:08:26.118Z"}],"details":{"listingId":"ceae5ad4-8de1-4b87-8d07-71b94d9ce507","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/14 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/14"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/14"},{"claim":"Documentation pages (/docs, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving customer records on-demand with per-call USDC micropayments","Integrating pay-as-you-go data access into agent workflows without API key management","Accessing structured customer data from a crypto-native API gateway"],"bestFor":["Developers wanting keyless, pay-per-request API access settled on Base","AI agents that can autonomously pay for data via x402","Projects needing low-friction access to customer data without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.237Z"},"updatedAt":"2026-04-29T16:08:26.118Z"}}