{"id":"d04da006-5acd-4a3e-b9ee-6612da65cd99","shortId":"tbQUaY","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/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/137` 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 by the platform.\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 at 6 decimals equals $0.02 per request. The endpoint accepts HTTP POST requests and returns `application/json` responses. No API keys are required; authentication and payment are handled entirely through the x402 payment header. The platform advertises no rate limits and instant access.\n\nThe platform's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal \"Connect wallet\" page with no substantive content, so there is no schema documentation, request/response examples, or detailed feature descriptions available. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","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":["No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no content.","The exact functionality of /api/v1/generate/resource/137 ('Premium API Access') is undocumented; its purpose must be guessed from the URL path.","No request or response schema is provided; callers have no way to know what payload to send or what to expect back.","The platform appears to be a demo or early-stage project with placeholder documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/137","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/137","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 402 challenge, confirming pricing and payment details. However, there is zero documentation on what this specific resource does, no request/response schema, and all doc pages are empty stubs. The listing is effectively a stub with confirmed 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'/api/v1/generate/resource/137':70 '/docs':175 '/pricing':176 '/readme':178 '/request':17,34 '0.02':16,33,132 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':121 '402':212 '6':129 'Base network API' 'USDC micropayment API' 'accept':137 'access':76,169 'advertis':163 'ai/ml':59 'amount':116 'analyt':58 'api':5,22,55,75,146 'application/json':143 'authent':150 'avail':203 'base':8,25,108,123 'beyond':84 'call':12,29,119 'challeng':213 'collect':46 'confirm':207 'connect':184 'content':190 'contract':112 'crypto-paid API' 'data':57,62 'decim':130 'descript':202 'detail':200 'document':83,173,196 'endpoint':6,23,36,94,136,205 'entir':155 'equal':131 'exact':79 'exampl':198 'featur':201 'finance/web3':61 'function':80 'gate':3,20 'generation/utility':93 'handl':101,154 'header':160 'http':138 'http-post' 'infer':60 'infrastructur':64 'instant':168 'json-response' 'key':147 'label':86 'like':89 'limit':166 'list':72 'live':208 'lowpaymentfee' 'lowpaymentfee.com':41 'maximum':115 'minim':183 'network':109 'no-api-key' 'offer':44,95 'one':90 'page':174,186 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':99,152,159 'per':11,28,53,118,133 'platform':42,98,162,171 'post':139 'premium':4,21,74 'premium API' 'protocol':50,105 'rate':165 'request':54,134,140 'request/response':197 'requir':117,149 'resolv':180 'resourc':68 'respons':144,214 'return':142 'schema':195 'span':56 'specif':67 'substant':189 'unit':124 'usdc':14,31,111,126 'usdc-base' 'use':110 'util':65 'valid':211 'via':102,209 'wallet':185 'x402':2,19,49,104,158 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"e1b324f7-ee99-49d5-aa23-d2008f5b73f5","listingId":"d04da006-5acd-4a3e-b9ee-6612da65cd99","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:34.891Z"}],"sources":[{"listingId":"d04da006-5acd-4a3e-b9ee-6612da65cd99","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:34.891Z","lastSeenAt":"2026-04-28T16:33:01.689Z"}],"details":{"listingId":"d04da006-5acd-4a3e-b9ee-6612da65cd99","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/137 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/137"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/137"},{"claim":"Documentation pages resolve to minimal 'Connect wallet' content with no substantive docs","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a generation or utility API endpoint without traditional API key signup","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access"],"bestFor":["Developers who want to pay per request with no subscription commitment","AI agents with x402-compatible payment capabilities","Users who prefer crypto-native (USDC on Base) payment rails"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 may not be cost-effective","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.499Z"},"updatedAt":"2026-04-28T16:33:01.689Z"}}