{"id":"f08004aa-a7bc-43e9-b610-693bc340e059","shortId":"jq5Yt6","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific resource `/api/v1/accounts/169` is one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC (USD Coin) on Base.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The `maxAmountRequired` is 20000 base units, which at 6 decimals equals $0.02. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised — access is purely pay-per-call.\n\nHowever, the specific functionality behind `/api/v1/accounts/169` is unclear. The platform's landing page lists various API categories (metrics, sentiment analysis, price feeds, geocoding, etc.) but this particular accounts endpoint is not documented among them. There is no OpenAPI spec, no request/response schema documentation, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The actual behavior of this endpoint after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","accounts endpoint","crypto-paid API"],"warnings":["The endpoint /api/v1/accounts/169 is not listed among the platform's documented APIs — its purpose is unclear","No OpenAPI spec or request/response schema is available","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content","The actual response payload after successful payment is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/169","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/accounts/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint /api/v1/accounts/169 is not documented anywhere on the site. There is no OpenAPI spec, no request/response schema, and the docs pages are empty. The actual functionality behind this endpoint is unknown, making it effectively a stub 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'0.02':10,28,86,127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20000':119 '6':124 'Base network API' 'USDC micropayment API' 'accept':105,130 'access':6,24,44,144 'account':178 'accounts endpoint' 'actual':213 'address':111 'advertis':143 'ai':73 'among':183 'analysi':170 'analyt':72 'api':5,16,23,34,43,137,166,199 'application/json':135 'base':8,26,52,95,120 'base-network' 'behavior':214 'behind':155 'call':150 'categori':69,167 'challeng':98 'coin':93 'confirm':99 'connect':205 'content':211 'crypto-paid API' 'data':71 'decim':125 'doc':196 'document':182,193 'endpoint':38,62,82,101,129,179,217 'equal':126 'etc':174 'exact':107 'exact-schem':106 'feed':172 'financ':76 'function':154 'gate':3,21 'geocod':173 'howev':151 'includ':70 'infrastructur':79 'json-response' 'key':17,35,138 'land':162 'learn':75 'limit':141 'list':164 'live':103 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':74 'mani':61 'maxamountrequir':117 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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/accounts/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:28.304Z"}],"sources":[{"listingId":"f08004aa-a7bc-43e9-b610-693bc340e059","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:28.304Z","lastSeenAt":"2026-04-24T08:02:47.220Z"}],"details":{"listingId":"f08004aa-a7bc-43e9-b610-693bc340e059","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/169 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/169"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/169"},{"claim":"Platform lists categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Exploring x402 payment protocol integrations with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-use API access on Base","Low-cost micropayment API consumption ($0.02/call)"],"notFor":["Users who need well-documented request/response schemas before integrating","High-volume use cases where per-request crypto settlement overhead matters","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.144Z"},"updatedAt":"2026-04-24T08:02:47.220Z"}}