{"id":"d466c4a2-c2f9-49a3-a3fc-5e86118132ab","shortId":"uxQAPe","kind":"x402","title":"x402-gated premium API endpoint on Base, paid per-request in USDC.","tagline":"x402-gated premium API endpoint on Base, paid per-request in USDC.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints covering data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific endpoint at `/api/resource/2` is labeled \"Premium API Access\" and returns a 402 challenge requesting payment of up to 20,000 units of USDC (asset 0x8335…2913) on the Base network. The x402 challenge confirms the endpoint is live and accepts POST requests.\n\nThe broader site advertises endpoints at $0.02 per request with no API keys, no rate limits, and instant access. However, the `/api/resource/2` path does not correspond to any of the documented v1/v2 API routes listed on the homepage (analytics, AI, finance, utilities), so its exact functionality is unclear. The 402 challenge's `maxAmountRequired` of 20,000 in USDC's 6-decimal representation equals $0.02, consistent with the site's advertised pricing. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation describing what `/api/resource/2` actually returns, the practical utility of this specific endpoint cannot be confirmed. Callers should treat this as an opaque premium resource behind an x402 paywall until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","http-post"],"categories":["api","x402"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["No documentation available — /docs, /pricing, and /README pages all return only a 'Connect wallet' prompt with no content.","The path /api/resource/2 does not match any of the documented API routes listed on the homepage; its actual functionality is unknown.","No OpenAPI schema, no request body schema, and no example responses are provided.","Cannot verify what data or service is delivered after successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/resource/2","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/2","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 /api/resource/2 actually does, no request/response schema, and the docs/pricing/README pages are empty. The endpoint path doesn't match any documented route on the site, making its purpose 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'/docs':170 '/pricing':171 '/readme':172 '0.02':103,160 '000':74,152 '0x8335':79 '20':73,151 '2913':80 '402':66,146 '6':156 'Base network API' 'USDC API' 'accept':94 'access':62,115 'actual':198 'advertis':100,166 'ai':136 'ai/ml':46 'analyt':45,135 'api':5,19,41,61,108,129 'asset':78 'base':8,22,83 'base-network' 'behind':219 'broader':98 'caller':210 'cannot':207 'challeng':67,87,147 'collect':32 'confirm':88,209 'connect':176 'consist':161 'content':182 'correspond':122 'cover':43 'data':44,49 'decim':157 'describ':195 'document':127,168,194,225 'endpoint':6,20,42,55,90,101,206 'equal':159 'exact':141 'exampl':191 'financ':137 'finance/web3':48 'function':142 'gate':3,17 'homepag':134 'host':30 'howev':116 'http-post' 'infer':47 'infrastructur':51 'instant':114 'key':109 'label':59 'limit':112 'list':131 'live':92 'lowpaymentfee' 'lowpaymentfee.com':29 'maxamountrequir':149 'micropayment API' 'network':84 'opaqu':216 'openapi':187 'page':169 'paid':9,23 'path':119 'pay':38 'pay-per-call API' 'pay-per-request':37 'payment':69 'paywal':222 'per':11,25,39,104 'per-request':10,24 'post':95 'practic':201 'premium':4,18,60,217 'premium API' 'price':167 'prompt':178 'protocol':36 'rate':111 'represent':158 'request':12,26,40,68,96,105 'request/response':190 'resourc':218 'return':64,173,199 'rout':130 'schema':188 'site':99,164 'specif':54,205 'substant':181 'surfac':226 'treat':212 'unclear':144 'unit':75 'usdc':14,28,77,154 'usdc-payment' 'util':52,138,202 'v1/v2':128 'wallet':177 'x402':2,16,35,86,221 'x402 endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"0d6bb5df-31a4-4ca0-bc54-4ff08d3c0308","listingId":"d466c4a2-c2f9-49a3-a3fc-5e86118132ab","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:57.271Z"}],"sources":[{"listingId":"d466c4a2-c2f9-49a3-a3fc-5e86118132ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:57.271Z","lastSeenAt":"2026-04-23T05:00:37.290Z"}],"details":{"listingId":"d466c4a2-c2f9-49a3-a3fc-5e86118132ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/2\n# Returns 402 with X-PAYMENT challenge; attach a valid x402 payment header to access the resource.","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/resource/2","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 site advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge requests payment of maxAmountRequired 20000 in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/resource/2"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for a premium resource without API keys or subscriptions","Integrating x402-compatible agents that auto-pay for API access on Base","Accessing gated content or data via USDC micropayments"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents on the Base network that hold USDC and need keyless API access","Projects wanting zero-commitment, no-rate-limit API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-billed API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:20:30.105Z"},"updatedAt":"2026-04-23T05:00:37.290Z"}}