{"id":"4c487698-5277-4942-8242-d556e7a07d31","shortId":"3a4sFr","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/157` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It may correspond to one of the platform's generation or utility endpoints.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts HTTP POST requests and returns `application/json`. No API keys or rate limits are advertised — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe platform advertises a uniform $0.02/request pricing across all its endpoints, with no minimums or commitments. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned minimal content (just \"Connect wallet\"), so detailed request/response schemas, parameter descriptions, and usage examples are unavailable. The endpoint is confirmed live via a proper 402 challenge response.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","http-post"],"categories":["infrastructure","utility"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["The exact functionality of /api/v1/generate/resource/157 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /api, /README) returned minimal content ('Connect wallet') with no usable information.","No request parameters or response schema are documented anywhere; integration requires trial-and-error or contacting the provider.","The platform lists many endpoints but none appear to have public documentation beyond a name and price."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/157","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is essentially no documentation: all doc pages return only \"Connect wallet.\" The specific function of resource/157 is unknown, no request or response schema is available, and the listing title \"Premium API Access\" is generic and 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'/api/v1/generate/resource/157':71 '/docs':186 '/pricing':187 '/readme':189 '/request':17,34,173 '0.02':16,33,131,172 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':123 '402':216 '6':134 'Base network API' 'USDC micropayment API' 'accept':138 'access':77 'across':175 'advertis':152,169 'ai':59 'amount':118 'analyt':58 'api':5,22,55,76,146 'application/json':144 'attach':155 'base':8,25,110,125 'beyond':85 'call':12,29,121 'caller':153 'challeng':217 'collect':46 'commit':183 'confirm':211 'connect':195 'content':193 'contract':114 'correspond':90 'crypto-paid API' 'data':57 'decim':135 'descript':202 'detail':198 'document':84,184 'endpoint':6,23,36,100,137,178,209 'equal':130 'exact':80 'exampl':205 'financ':62 'function':81 'gate':3,20 'generat':97 'handl':103 'header':160 'http':139 'http-post' 'infrastructur':65 'json-api' 'key':147 'label':87 'learn':61 'limit':150 'list':73 'live':212 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':60 'maximum':117 'may':89 'minim':192 'minimum':181 'network':111 'no-api-key' 'offer':44 'one':92 'page':185 'paramet':201 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':101,159,165 'per':11,28,53,120 'platform':42,95,168 'post':140 'premium':4,21,75 'premium API' 'price':174 'proof':166 'proper':215 'protocol':50,107 'rate':149 'request':54,141 'request/response':199 'requir':119 'resourc':69 'respons':218 'return':143,191 'schema':200 'simpli':154 'span':56 'specif':68 'unavail':207 'uniform':171 'unit':126 'usag':204 'usdc':14,31,113,128,132 'usdc-base' 'use':112,133 'util':66,99 'valid':163 'via':104,213 'wallet':196 'web3':63 'x':158 'x-payment':157 'x402':2,19,49,106,164 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"225a77e1-2161-4a33-a323-ffc4ec0a15a1","listingId":"4c487698-5277-4942-8242-d556e7a07d31","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:18.526Z"}],"sources":[{"listingId":"4c487698-5277-4942-8242-d556e7a07d31","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:18.526Z","lastSeenAt":"2026-04-28T17:34:18.577Z"}],"details":{"listingId":"4c487698-5277-4942-8242-d556e7a07d31","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/157 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/157"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/157"},{"claim":"Platform offers endpoints in categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-request utility or generation endpoint without needing API keys or subscriptions","Integrating x402-compatible agents that can autonomously pay for API calls on Base","Testing x402 protocol payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access on Base","Low-volume or sporadic API usage where subscriptions are undesirable"],"notFor":["Users who need detailed API documentation or well-defined request/response schemas before integrating","High-volume production workloads where $0.02/request adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.289Z"},"updatedAt":"2026-04-28T17:34:18.577Z"}}