{"id":"d07f7fc4-bc58-4c28-a050-1127b3174129","shortId":"ZWrBDL","kind":"x402","title":"x402-gated premium API access — pay $0.02 per request in USDC on Base, no API keys required.","tagline":"x402-gated premium API access — pay $0.02 per request in USDC on Base, no API keys required.","description":"lowpaymentfee.com is a multi-category API platform that gates every endpoint behind the x402 payment protocol. The specific endpoint at `/api/v1/customers/1` is listed as \"Premium API Access\" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913) on the Base network. The maximum amount required per call is 20,000 units (which, given USDC's 6-decimal precision, equals $0.02). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the endpoint accepts POST requests.\n\nThe broader platform advertises endpoints across four 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, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific behavior of the `/api/v1/customers/1` endpoint (what data it returns, what input it expects) is not documented anywhere in the crawled material. Callers should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["data","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","402 payment API","crypto-gated API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or schema definition found; request and response formats are unknown.","The specific purpose and data returned by /api/v1/customers/1 is not documented anywhere.","The platform appears to be a demo or early-stage project with placeholder endpoints across many categories."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/1","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/1","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 is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of the /api/v1/customers/1 endpoint is entirely undocumented. The listing is effectively a stub with pricing info 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'/api/v1/customers/1':58,214 '/docs':177 '/pricing':179 '/readme':181 '0.02':8,26,99,158 '000':89 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':105 '0x8335':75 '20':88 '2913':76 '402':68 '402 payment API' '6':95 'Base network API' 'USDC API access' 'accept':109 'access':6,24,64 'across':117 'address':104 'advertis':115 'ai':127 'amount':83 'analysi':131 'analyt':121 'anywher':227 'api':5,16,23,34,43,63,163 'avail':208 'base':14,32,79 'behavior':211 'behind':49 'broader':113 'call':86 'caller':232 'categori':42,119 'challeng':69 'classif':134 'commit':171 'connect':187 'contact':238 'contract':74 'convers':151 'crawl':230 'crypto-gated API' 'data':120,124,217 'decim':96 'detail':194,242 'document':172,203,226 'embed':135 'endpoint':48,56,108,116,154,215 'equal':98 'estim':145 'everi':47 'exampl':206 'exchang':140 'expect':223,234 'experi':236 'export':125 'extrem':174 'feed':139 'financ':136 'four':118 'gas':144 'gate':3,21,46 'generat':152 'geocod':149 'given':92 'infrastructur':147 'input':221 'insight':126 'json-response' 'key':17,35,164 'learn':129 'limit':167 'list':60 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':128 'materi':231 'maximum':82 'metric':122 'micropayment API' 'minimum':170 'multi':41 'multi-categori':40 'network':80 'no-api-key' 'openapi':198 'page':182 'pay':7,25 'pay-per-call API' 'payload':207 'payment':52,71,100 'per':9,27,85,159 'per-request-billing' 'platform':44,114 'post':110 'post-endpoint' 'precis':97 'premium':4,22,62 'price':138,156 'prompt':189 'protocol':53 'provid':240 'quot':143 'rate':141,166 'render':184 'report':123 'request':10,28,70,111,160 'request/response':201 'requir':18,36,84 'return':66,219 'schema':202 'sent':102 'sentiment':130 'spars':175 'spec':199 'specif':55,210 'summar':133 'technic':193 'text':132 'token':142 'unit':90 'usdc':12,30,73,93 'usdc-on-base' 'util':148 'valid':150 'wallet':188 'web3':137 'x402':2,20,51 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"e43046d0-4d49-45a9-9b99-b9e66d6414e0","listingId":"d07f7fc4-bc58-4c28-a050-1127b3174129","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:16.510Z"}],"sources":[{"listingId":"d07f7fc4-bc58-4c28-a050-1127b3174129","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:16.510Z","lastSeenAt":"2026-04-24T13:31:32.245Z"}],"details":{"listingId":"d07f7fc4-bc58-4c28-a050-1127b3174129","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/1 \\\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 challenge requesting USDC payment on Base with maxAmountRequired of 20000 (i.e., $0.02)","source_url":"https://lowpaymentfee.com/api/v1/customers/1"},{"claim":"All endpoints 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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data feeds without traditional API key registration","Agent-driven workflows that need on-demand API calls settled in USDC","Programmatic access to customer data behind a micropayment wall"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or rate-limit guarantees","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.132Z"},"updatedAt":"2026-04-24T13:31:32.245Z"}}