{"id":"b087d416-a9f9-4bee-89bf-93aef6892e00","shortId":"5Ch7WY","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com is one of many x402-protocol-gated API resources offered by the provider. The specific resource at `/api/v1/generate/resource/14` is listed as \"Premium API Access\" and returns an x402 challenge requiring payment in USDC on the Base network. The provider's site advertises a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced at $0.02 per request with no API keys, no rate limits, and instant access.\n\nThe x402 challenge for this particular resource specifies a maxAmountRequired of 20000 (in USDC's 6-decimal representation, equating to $0.02) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts HTTP POST requests and returns `application/json`. The payment scheme is \"exact\" with a timeout of 300 seconds.\n\nHowever, the actual functionality behind this specific resource path (`/resource/14`) is unclear. The provider's landing page lists named endpoints (e.g., Metrics API, Sentiment Analysis, Geocoding) but does not reference a `/generate/resource/14` path. No documentation, request/response schemas, or examples are available — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does when paid, its practical utility cannot be assessed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC gated endpoint","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","The specific resource path /api/v1/generate/resource/14 is not listed among the provider's named endpoints, making its purpose unknown","No request or response schema is provided; callers cannot know what to send or what they will receive","Cannot verify what the endpoint returns after successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/14","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/generate/resource/14","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 x402 challenge, but there is no documentation, no request/response schema, and no indication of what '/generate/resource/14' actually returns. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/generate/resource/14':191 '/resource/14':169 '0.02':95,128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':139 '20000':119 '300':158 '6':123 'Base network API' 'USDC gated endpoint' 'accept':142 'access':57,107 'actual':162,224 'address':131 'advertis':75 'ai':84 'analysi':184 'analyt':83 'api':5,19,41,56,100,182,204 'application/json':148 'assess':233 'avail':200 'base':8,22,69,138 'behind':164 'broad':77 'cannot':231 'catalog':78 'challeng':62,110 'connect':212 'content':218 'contract':136 'data':82 'decim':124 'doc':202 'document':194 'e.g':180 'endpoint':6,20,30,80,141,179,223 'equat':126 'exact':153 'exampl':198 'financ':87 'function':163 'gate':3,17,40 'geocod':185 'howev':160 'http':143 'http-post' 'infrastructur':90 'instant':106 'json-response' 'key':101 'know':220 'land':175 'learn':86 'limit':104 'list':53,177 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':85 'mani':36 'maxamountrequir':117 'metric':181 'micropayment API' 'name':178 'network':70 'offer':43 'one':34 'page':176,207 'paid':129,227 'particular':113 'path':168,192 'pay':10,24 'pay-per-call API' 'pay-per-request':9,23 'payment':64,150 'per':11,25,96 'post':144 'practic':229 'premium':4,18,55 'price':93,203 'prompt':214 'protocol':39 'provid':46,72,173 'rate':103 'readm':206 'refer':189 'render':209 'represent':125 'request':12,26,97,145 'request/response':195 'requir':63 'resourc':42,49,114,167 'return':59,147 'schema':196 'scheme':151 'second':159 'sentiment':183 'site':74 'span':81 'specif':48,166 'specifi':115 'substant':217 'timeout':156 'unclear':171 'usdc':14,28,66,121,135 'usdc-base' 'use':133 'util':91,230 'wallet':213 'web3':88 'without':219 'x402':2,16,38,61,109 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':37","prices":[{"id":"9ec532e3-cc0d-4558-be13-76b5f6e25518","listingId":"b087d416-a9f9-4bee-89bf-93aef6892e00","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/generate/resource/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:03.914Z"}],"sources":[{"listingId":"b087d416-a9f9-4bee-89bf-93aef6892e00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:03.914Z","lastSeenAt":"2026-04-23T04:00:38.786Z"}],"details":{"listingId":"b087d416-a9f9-4bee-89bf-93aef6892e00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/14\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/14"},{"claim":"The provider advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/14"}],"useCases":["Programmatic access to a premium API resource via x402 micropayment","Agent-driven pay-per-request workflows on Base L2","Testing x402 protocol integrations with a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need pay-per-call API access without API keys","Projects already using USDC on Base"],"notFor":["Users who need clear documentation of request/response formats before paying","Production workloads requiring SLA guarantees or known output schemas","Anyone needing free or trial access to evaluate the endpoint's output"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.76Z"},"updatedAt":"2026-04-23T04:00:38.786Z"}}