{"id":"86c1be34-88fa-4714-b6d1-5923bf179056","shortId":"hYctNc","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/39` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is likely one of the generation/utility endpoints offered on the platform.\n\nThe endpoint is live and returns a standard x402 payment challenge. It accepts payment via the \"exact\" scheme on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this specific resource actually returns. The input schema indicates it accepts HTTP POST requests and is discoverable, but no request body schema or response schema is provided.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","http-post","no-api-key"],"categories":["infrastructure","utility"],"synonyms":["premium API","pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/39 ('Premium API Access') is completely undocumented","No request body schema or response schema provided","No examples of expected input or output"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/39","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/39","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' at resource/39 actually does. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,149 '0.02':16,33,139,148 '000':132 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':125 '20':131 '6':142 'Base network API' 'USDC micropayment API' 'accept':112,208 'access':77,162 'across':151 'actual':201 'advertis':146 'ai':59 'amount':128 'analyt':58 'api':5,22,55,76,155,169 'base':8,25,120,133 'base-network' 'beyond':85 'bodi':218 'call':12,29 'challeng':110 'collect':46 'connect':178 'content':184 'contract':124 'crypto-paid API' 'data':57 'decim':143 'descript':195 'discover':214 'doc':168 'document':84,163 'endpoint':6,23,36,95,101,153 'equal':138 'exact':80,116 'exampl':192 'extrem':165 'financ':62 'function':81 'gate':3,20 'generation/utility':94 'http':209 'http-post' 'indic':206 'infrastructur':65 'input':204 'instant':161 'key':156 'label':87 'learn':61 'like':90 'limit':159 'list':73 'live':103 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':60 'maximum':127 'network':121 'no-api-key' 'offer':44,96 'one':91 'openapi':188 'page':173 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':109,113 'per':11,28,53 'platform':42,99,145 'post':210 'premium':4,21,75 'premium API' 'price':150,170 'prompt':180 'protocol':50 'provid':224 'rate':158 'readm':172 'render':175 'request':54,211,217 'request/response':191 'requir':129 'resourc':69,200 'respons':221 'return':105,202 'schema':189,205,219,222 'scheme':117 'span':56 'spars':166 'specif':68,199 'standard':107 'substant':183 'uniform':147 'unit':134 'usdc':14,31,123,136,140 'usdc-payment' 'use':122,141 'util':66 'via':114 'wallet':179 'web3':63 'x402':2,19,49,108 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"594c64cc-ceb9-4f46-9938-77d5621ef8e9","listingId":"86c1be34-88fa-4714-b6d1-5923bf179056","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:43.295Z"}],"sources":[{"listingId":"86c1be34-88fa-4714-b6d1-5923bf179056","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:43.295Z","lastSeenAt":"2026-04-28T20:04:13.863Z"}],"details":{"listingId":"86c1be34-88fa-4714-b6d1-5923bf179056","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/39 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/39"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/39"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a pay-per-request utility endpoint without needing API key registration","Making micropayment-gated API calls settled in USDC on Base","Integrating x402-compatible agent workflows with low-cost per-call pricing"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-cost per-request utility calls settled in USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Use cases requiring well-defined request/response schemas before integration","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.899Z"},"updatedAt":"2026-04-28T20:04:13.863Z"}}