{"id":"05c316c9-3d56-4712-81f5-4aabb0f1bfd5","shortId":"bzpm7B","kind":"x402","title":"x402-gated premium API endpoint on Base network, paid per-request in USDC.","tagline":"x402-gated premium API endpoint on Base network, paid per-request in USDC.","description":"This endpoint at `/api/endpoint-9` is part of the lowpaymentfee.com platform, which offers a collection of x402 protocol-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint is labeled \"Premium API Access\" with no further description of its functionality beyond that generic title.\n\nThe endpoint is live and returns a valid x402 payment challenge. It accepts POST requests and requires payment via USDC (asset `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on the Base network. The maximum amount required per request is 20,000 units (in USDC's 6-decimal representation, this equates to $0.02). Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a timeout of 300 seconds.\n\nNotably, this endpoint (`/api/endpoint-9`) does not appear in the site's publicly listed API catalog, which enumerates endpoints under `/api/v1/` and `/api/v2/` paths. The site's documentation, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no input/output documentation, and no examples available. Without knowing what this endpoint actually does, callers should treat it as an opaque premium service with unknown functionality.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","post-endpoint","pay-per-request"],"categories":["api","x402"],"synonyms":["lowpaymentfee","premium api","x402 endpoint","USDC api","base network api","pay-per-call api","micropayment api"],"warnings":["Endpoint /api/endpoint-9 is not listed in the site's public API catalog — its purpose is unknown","No input schema or output schema documented; callers cannot know what to send or what to expect","All documentation pages (docs, pricing, README) render only 'Connect wallet' with no content","Generic 'Premium API Access' label provides no indication of actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-9","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/endpoint-9","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 402 challenge, but there is zero documentation on what it actually does, no input/output schema, and the endpoint path doesn't appear in the site's own catalog. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1':160 '/api/v2':162 '0.02':124 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20':112 '300':139 '6':118 'USDC api' 'accept':91 'access':67 'actual':200 'address':133 'ai/ml':54 'amount':107 'analyt':53 'api':5,20,50,66,154 'appear':147 'asset':99 'avail':194 'base':8,23,103 'base network api' 'base-network' 'beyond':75 'caller':202 'catalog':155 'challeng':89 'collect':44 'connect':176 'content':182 'data':52 'decim':119 'descript':71 'document':167,190 'endpoint':6,21,32,62,80,143,158,199 'enumer':157 'equat':122 'exact':130 'exampl':193 'finance/web3':56 'function':74,213 'gate':3,18,49 'generic':77 'infer':55 'infrastructur':58 'input/output':189 'know':196 'label':64 'list':153 'live':82 'lowpaymentfee' 'lowpaymentfee.com':39 'made':127 'maximum':106 'micropayment api' 'network':9,24,104 'notabl':141 'offer':42 'opaqu':208 'openapi':186 'page':171 'paid':10,25 'part':36 'path':163 'pay-per-call api' 'pay-per-request' 'payment':88,96,125 'per':12,27,109 'per-request':11,26 'platform':40 'post':92 'post-endpoint' 'premium':4,19,65,209 'premium api' 'price':168 'prompt':178 'protocol':48 'protocol-g':47 'public':152 'readm':170 'render':173 'represent':120 'request':13,28,93,110 'requir':95,108 'return':84 'schema':187 'scheme':131 'second':140 'servic':210 'site':150,165 'span':51 'specif':61 'substant':181 'timeout':137 'titl':78 'treat':204 'unit':114 'unknown':212 'usdc':15,30,98,116 'usdc-payment' 'util':59 'valid':86 'via':97,128 'wallet':177 'without':195 'x402':2,17,46,87 'x402 endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"065a39f8-e80a-4bc3-b55a-12f518c82264","listingId":"05c316c9-3d56-4712-81f5-4aabb0f1bfd5","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/endpoint-9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:54.230Z"}],"sources":[{"listingId":"05c316c9-3d56-4712-81f5-4aabb0f1bfd5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:54.230Z","lastSeenAt":"2026-04-23T05:00:37.136Z"}],"details":{"listingId":"05c316c9-3d56-4712-81f5-4aabb0f1bfd5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-9\n# Returns 402 with X-PAYMENT challenge; attach payment header to complete request.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/endpoint-9","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with USDC payment on Base network at $0.02 per request","source_url":"https://lowpaymentfee.com/api/endpoint-9"},{"claim":"The site lists APIs under /api/v1/ and /api/v2/ paths at $0.02/request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, and README pages show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an x402-gated premium service via USDC micropayments","Agent-driven API consumption without API keys or subscriptions","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can handle on-chain USDC payments on Base","Use cases where keyless, pay-per-request access is preferred"],"notFor":["Users who need documented input/output schemas before integrating","Applications requiring guaranteed SLAs or support","Anyone needing to understand what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.337Z"},"updatedAt":"2026-04-23T05:00:37.136Z"}}