{"id":"c21ec769-b254-4f8d-a06e-60af7e702540","shortId":"YaUuCy","kind":"x402","title":"Pay-per-call customer data API on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call customer data API on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a \"Premium API Access\" resource at the path `/api/v1/customers/44`. It is part of a broader platform offering dozens of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/customers/44` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header with no API keys, no rate limits, and no upfront commitments. The payment timeout is 300 seconds.\n\nDocumentation on the site is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what the `/api/v1/customers/44` resource actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data or functionality is behind this particular path.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["data","api-marketplace"],"synonyms":["customer data API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific resource '/api/v1/customers/44' has no description beyond the generic 'Premium API Access' label","Cannot verify what data is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/44","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, and no meaningful documentation — every doc page just shows 'Connect wallet'. The purpose of /api/v1/customers/44 is 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'/api/v1/customers/44':46,88,194 '/docs':157 '/pricing':158 '/readme':161 '/request':13,28 '0.02':12,27,115 '000':104 '0x8335':109 '20':103 '2913':110 '300':147 '402':203 '6':120 'Base network API' 'USDC micropayment API' 'accept':89 'access':36,41 'actual':196 'addit':172 'advertis':98 'ai/ml':65 'analyt':64 'api':7,22,40,61,134 'base':9,24,81,105,112 'base-network' 'behind':221 'beyond':183 'broader':52 'call':4,19 'captur':205 'challeng':97,204 'commit':142 'confirm':201 'connect':167 'cost':101 'custom':5,20 'customer data API' 'data':6,21,63,69,217 'decim':121 'descript':190 'detail':174 'difficult':213 'document':149,210 'dozen':55 'endpoint':32,87,199 'equal':114 'extrem':154 'financ':67 'function':219 'header':131 'infer':66 'infrastructur':71 'inlin':125 'json':94 'json-response' 'key':135 'know':215 'lack':208 'limit':138 'live':202 'lowpaymentfee' 'lowpaymentfee.com':34 'made':124 'make':211 'maximum':100 'network':82 'no-api-key' 'offer':54 'openapi':178 'outputschema':186 'page':162 'part':49 'particular':223 'path':45,224 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':122,130,144 'per':3,18,59,116 'platform':53 'post':90 'post-method' 'premium':39 'premium API access' 'prompt':169 'protocol':78 'provid':35 'rate':137 'render':164 'request':60,91,117 'request/response':181 'resourc':42,195 'return':93,197 'schema':182 'second':148 'settl':74 'site':152 'span':62 'spec':179 'specif':86 'stub':187 'technic':173 'thin':155 'timeout':145 'unit':106 'upfront':141 'usdc':15,30,84,108,118 'usdc-settlement' 'use':83,119 'util':72 'via':10,25,75,126 'wallet':168 'web3':68 'x':129 'x-payment':128 'x402':11,26,77,96,185 'x402 API' 'x402-payment'","prices":[{"id":"96e8280e-bb62-443e-bc5d-99afad15e067","listingId":"c21ec769-b254-4f8d-a06e-60af7e702540","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:36.118Z"}],"sources":[{"listingId":"c21ec769-b254-4f8d-a06e-60af7e702540","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:36.118Z","lastSeenAt":"2026-04-23T15:00:45.455Z"}],"details":{"listingId":"c21ec769-b254-4f8d-a06e-60af7e702540","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/44 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/44"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/44"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching customer record data 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 Base"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that need keyless, on-demand API access settled in USDC on Base","Low-volume or sporadic data retrieval where subscription pricing is wasteful"],"notFor":["High-volume bulk data retrieval where per-request fees add up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.269Z"},"updatedAt":"2026-04-23T15:00:45.455Z"}}