{"id":"397a0393-8437-496e-ba8d-e8a0894ec17a","shortId":"BG3NsQ","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/51`) is labeled \"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) at 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 listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.\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 detailed description of what the `/api/v1/customers/51` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual data payload behind the paywall is unknown. The \"customers/51\" path suggests a specific customer record, but without documentation or sample responses this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","customer data API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition; request body format and response structure are completely unknown","The path '/api/v1/customers/51' suggests a specific resource but its nature is undocumented","No rate limit or SLA information provided despite the claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/51","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/51","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 with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and no explanation of what data the endpoint returns. The listing is effectively a stub with verified liveness and 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'/api/v1/customers/51':58,208 '/docs':176 '/pricing':177 '/readme':180 '/request':17,34,154 '0.02':16,33,97,153 '000':92 '0x8335':82 '20':91 '2913':83 '402':220 '6':102 'Base network API' 'USDC micropayment API' 'access':45,63,170 'across':110 'actual':210,225 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':7,24,44,62,161 'base':9,26,53,85,93 'base-network' 'behind':228 'broader':105 'call':4,21 'categori':112 'challeng':222 'classif':127 'collect':38 'confirm':215 'connect':186 'content':192 'contract':81 'convers':144 'cost':89 'crypto-paid API' 'custom':5,22,239 'customer data API' 'customers/51':234 'data':6,23,67,113,117,226 'decim':103 'descript':204 'detail':203 'document':171,243 'embed':128 'emphas':159 'endpoint':57,109,147,209,213 'equal':96 'estim':138 'exampl':200 'exchang':133 'export':118 'extrem':173 'feed':132 'financ':129 'gas':137 'generat':145 'geocod':142 'header':73 'host':36 'infrastructur':140 'insight':119 'instant':169 'json':66 'json-response' 'key':162 'label':60 'learn':122 'limit':165 'list':149 'live':216 'lowpaymentfee' 'lowpaymentfee.com':35,106 'machin':121 'maximum':88 'metric':115 'minimum':167 'network':54 'no-api-key' 'openapi':196 'page':181 'path':235 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payload':227 'payment':49,72,76 'paywal':230 'per':3,20,42,98 'platform':107,158 'point':156 'premium':61 'price':131,155 'prompt':188 'proper':219 'protocol':50 'provid':75 'quot':136 'rate':134,164 'record':240 'render':183 'report':116 'request':43,99 'request/response':199 'respons':246 'return':65,211,217 'sampl':245 'schema':197 'sentiment':123 'settl':12,29,78 'sever':111 'spars':174 'specif':56,238 'specul':249 'suggest':236 'summar':126 'text':125 'token':135 'unit':94 'unknown':232 'usdc':14,31,80,100 'usdc-settlement' 'use':101 'util':141 'valid':70,143 'via':10,27,46 'wallet':187 'web3':130 'without':242 'x402':11,28,48,71,221 'x402 API' 'x402-payment'","prices":[{"id":"f0fca3b0-389d-4372-a3ef-46845356e9ab","listingId":"397a0393-8437-496e-ba8d-e8a0894ec17a","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:29.489Z"}],"sources":[{"listingId":"397a0393-8437-496e-ba8d-e8a0894ec17a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:29.489Z","lastSeenAt":"2026-04-29T13:04:25.681Z"}],"details":{"listingId":"397a0393-8437-496e-ba8d-e8a0894ec17a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/51 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/51"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/51"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching customer or resource data behind a per-call USDC paywall","Demonstrating x402 payment protocol integration on Base","Agent-driven data retrieval with no API key or subscription required"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Low-volume, on-demand data access without subscription commitments"],"notFor":["High-volume bulk data retrieval where per-call pricing is inefficient","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.634Z"},"updatedAt":"2026-04-29T13:04:25.681Z"}}