{"id":"b1bc7378-2044-46c8-96c9-76cea53e6062","shortId":"vd8qEQ","kind":"x402","title":"x402-gated premium API endpoint on Base network, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base network, pay-per-request with USDC.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/crypto data, and infrastructure utilities. The specific endpoint at `/api/resource/5` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment in USDC on the Base network.\n\nThe x402 challenge for this endpoint specifies a maximum amount of 20,000 units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), using the \"exact\" payment scheme. The endpoint accepts HTTP POST requests and returns application/json responses. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\n\nHowever, the specific functionality behind `/api/resource/5` is not documented. The site's landing page lists numerous other endpoints (analytics, AI, finance, utilities) all priced at $0.02 per request, but `/api/resource/5` does not appear among them. The docs, pricing, and README pages returned only a \"Connect wallet\" prompt with no substantive content. Without documentation of what this endpoint actually does or what input it expects, its practical utility is unclear.","tags":[],"capabilities":["x402-payment-gated","usdc-base-network","pay-per-request","http-post","json-response"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-request API","USDC gated endpoint","lowpaymentfee","Base network API","micropayment API","402 payment required"],"warnings":["The specific endpoint /api/resource/5 is not listed among the site's documented APIs — its functionality is unknown.","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content.","maxAmountRequired of 20000 USDC units — actual dollar cost is unclear without knowing the token decimals context (USDC has 6 decimals, so this would be $0.02).","No input schema or example payloads are available for this endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/resource/5","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/resource/5","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 402 challenge, but there is no documentation of what `/api/resource/5` actually does, no input/output schema beyond the 402 challenge, and the docs/pricing/README pages are empty. The endpoint doesn't appear in the site's own listed API catalog, making its purpose entirely 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'0.02':156 '000':91 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':96 '20':90 '402':69 '402 payment required' 'Base network API' 'USDC gated endpoint' 'accept':106 'access':65,122 'actual':188 'advertis':121 'ai':150 'ai/ml':48 'among':164 'amount':88 'analyt':47,149 'api':5,20,43,64,115 'appear':163 'application/json':112 'asset':95 'base':8,23,77,98 'behind':135 'challeng':70,81 'collect':34 'connect':175 'content':181 'data':46,51 'doc':167 'document':139,183 'endpoint':6,21,44,57,84,105,148,187 'exact':101 'expect':194 'financ':151 'finance/crypto':50 'function':134 'gate':3,18,124 'header':130 'host':32 'howev':131 'http':107 'http-post' 'infer':49 'infrastructur':53 'input':192 'json-response' 'key':116 'land':143 'limit':119 'list':61,145 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':87 'micropayment API' 'network':9,24,78 'numer':146 'page':144,171 'pay':11,26,40 'pay-per-request':10,25,39 'pay-per-request API' 'payment':72,102,129 'per':12,27,41,157 'post':108 'practic':196 'premium':4,19,63 'price':154,168 'prompt':177 'protocol':38 'pure':125 'rate':118 'readm':170 'request':13,28,42,109,158 'requir':71 'respons':113 'return':67,111,172 'scheme':103 'site':141 'span':45 'specif':56,133 'specifi':85 'substant':180 'unclear':199 'unit':92 'usdc':15,30,74,94 'usdc-base-network' 'use':99 'util':54,152,197 'wallet':176 'without':182 'x402':2,17,37,80,128 'x402 API' 'x402-gated':1,16 'x402-payment-gated' 'x402-protocol':36","prices":[{"id":"aae48f4d-e44c-4dd5-b237-fcdc1be0f3d2","listingId":"b1bc7378-2044-46c8-96c9-76cea53e6062","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/resource/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:52.444Z"}],"sources":[{"listingId":"b1bc7378-2044-46c8-96c9-76cea53e6062","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:52.444Z","lastSeenAt":"2026-04-24T15:01:51.896Z"}],"details":{"listingId":"b1bc7378-2044-46c8-96c9-76cea53e6062","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/5\n# Returns 402 with X-PAYMENT challenge header\n# Attach a valid x402 payment header (USDC on Base) to access the resource","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/resource/5","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 x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/resource/5"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/resource/5"},{"claim":"The site lists endpoints for analytics, AI/ML, finance, and utility categories but /api/resource/5 is not among them","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API resource via x402 micropayment on Base","Demonstrating x402 protocol payment flows","Agent-initiated pay-per-call API consumption"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC transactions on Base","Use cases requiring keyless, pay-per-request API access"],"notFor":["Users who need documented, well-specified API contracts","Production workloads requiring SLAs or guaranteed uptime","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.41Z"},"updatedAt":"2026-04-24T15:01:51.896Z"}}