{"id":"e7928f9e-90cf-4a32-870f-13e12a6e3d9e","shortId":"w7NFtw","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 payment protocol on the Base network. This specific endpoint (`/api/v1/customers/4`) is listed as \"Premium API Access\" and returns JSON data when a valid x402 payment header is provided. Payment is settled in USDC (contract 0x8335…2913 on Base) 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 endpoints across several 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 with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/customers/4` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data to send or expect back.","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","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages are all empty stubs","No OpenAPI or request/response schema provided; unclear what this endpoint returns","The endpoint path '/api/v1/customers/4' suggests a specific resource but its contents are unknown","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of /api/v1/customers/4 is not explained 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'/api/v1/customers/4':58,202 '/docs':171 '/pricing':172 '/readme':175 '/request':17,34 '0.02':16,33,98,152 '000':93 '0x8335':83 '20':92 '2913':84 '402':211 '6':103 'Base network API' 'USDC micropayment API' 'access':45,64 'across':111 'actual':204 'advertis':109 'ai':121 'analysi':125 'analyt':115 'api':7,24,44,63,157 'back':230 'base':9,26,53,86,94 'base-network' 'broader':106 'call':4,21 'captur':213 'categori':113 'challeng':212 'classif':128 'collect':38 'commit':165 'confirm':209 'connect':181 'content':187 'contract':82 'convers':145 'cost':90 'crypto-paid API' 'custom':5,22 'customer-data' 'data':6,23,68,114,118,225 'decim':104 'descript':198 'difficult':221 'document':166,218 'embed':129 'endpoint':57,110,148,203,207 'equal':97 'estim':139 'exampl':195 'exchang':134 'expect':229 'export':119 'extrem':168 'feed':133 'financ':130 'gas':138 'generat':146 'geocod':143 'header':74 'host':36 'infrastructur':141 'insight':120 'json':67 'json-response' 'key':158 'know':223 'lack':216 'learn':123 'limit':161 'list':60 'live':210 'lowpaymentfee' 'lowpaymentfee.com':35,107 'machin':122 'make':219 'maximum':89 'metric':116 'minimum':164 'network':54 'no-api-key' 'openapi':191 'page':176 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':49,73,77 'per':3,20,42,99,153 'platform':108 'premium':62 'premium API access' 'price':132,150 'prompt':183 'protocol':50 'provid':76 'quot':137 'rate':135,160 'render':178 'report':117 'request':43,100,154 'request/response':194 'return':66,205 'schema':192 'send':227 'sentiment':124 'settl':12,29,79 'sever':112 'spars':169 'specif':56 'summar':127 'text':126 'token':136 'unit':95 'usdc':14,31,81,101 'usdc-settlement' 'use':102 'util':142 'valid':71,144 'via':10,27,46 'wallet':182 'web3':131 'x402':11,28,48,72 'x402 API' 'x402-payment'","prices":[{"id":"954dbe4b-a9e8-4ebb-bd42-69da79c8fa11","listingId":"e7928f9e-90cf-4a32-870f-13e12a6e3d9e","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:18.523Z"}],"sources":[{"listingId":"e7928f9e-90cf-4a32-870f-13e12a6e3d9e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:18.523Z","lastSeenAt":"2026-04-29T10:34:25.021Z"}],"details":{"listingId":"e7928f9e-90cf-4a32-870f-13e12a6e3d9e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/4 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/customers/4"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/4"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching customer or entity data on a per-request payment basis without needing API keys","Integrating pay-as-you-go data access into autonomous agents via x402","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Low-volume or sporadic data retrieval where subscriptions are overkill"],"notFor":["Production workloads requiring well-documented, schema-validated APIs","High-volume use cases where per-request pricing is inefficient","Users who need detailed documentation or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.291Z"},"updatedAt":"2026-04-29T10:34:25.021Z"}}