{"id":"08669d56-5521-44d0-9a0f-b66f12e5ac8c","shortId":"Lqfe8n","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/193` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label.\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 platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof to each POST request.\n\nThe platform lists many other endpoints at the same $0.02 price point covering sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this or any endpoint are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["premium API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","402 payment endpoint"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no substantive content","The exact functionality of /api/v1/generate/resource/193 ('Premium API Access') is undocumented and unclear","No request or response schema is provided; callers cannot know what to send or expect back","The platform lists many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/193","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of 'resource/193' is entirely opaque. All doc pages returned only 'Connect wallet' with no 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'/api/v1/generate/resource/193':71 '/docs':184 '/pricing':185 '/readme':187 '/request':17,34 '0.02':16,33,118,162 '000':111 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':102 '20':110 '402 payment endpoint' '6':121 'Base network API' 'USDC micropayment API' 'access':77,134 'actual':201 'advertis':125 'ai/ml':59 'amount':105 'analysi':167 'analyt':58 'api':5,22,55,76,127 'attach':137 'base':8,25,97,112 'base-network' 'beyond':85 'call':12,29,108 'caller':135 'classif':170 'collect':46 'connect':192 'content':198 'contract':101 'convers':178 'cover':165 'data':57,63 'decim':122 'document':84,182 'embed':171 'endpoint':6,23,36,158,208 'equal':117 'exact':80 'exchang':174 'feed':173 'financ':61 'function':81 'gate':3,20 'generat':180 'geocod':176 'handl':90 'header':142 'howev':181 'http-post' 'infer':60 'infrastructur':65 'instant':133 'json-response' 'key':128 'label':87 'limit':131 'list':73,155 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':156 'maximum':104 'network':98 'offer':44 'page':183 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':88,141,147 'per':11,28,53,107 'platform':42,124,154 'point':164 'post':151 'premium':4,21,75 'premium API' 'price':163,172 'prompt':194 'proof':148 'protocol':50,94 'rate':130,175 'request':54,152 'request/response':202 'requir':106 'resourc':69 'return':189 'schema':203 'sentiment':166 'simpli':136 'span':56 'specif':68 'substant':197 'summar':169 'text':168 'unit':113 'unknown':210 'usdc':14,31,100,115,119 'usdc-settlement' 'use':99,120 'util':66 'valid':145,177 'via':91 'wallet':193 'web3':62 'x':140 'x-payment':139 'x402':2,19,49,93,146 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"16db66e1-c822-44d2-ae49-500ed088bb8d","listingId":"08669d56-5521-44d0-9a0f-b66f12e5ac8c","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:51.069Z"}],"sources":[{"listingId":"08669d56-5521-44d0-9a0f-b66f12e5ac8c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:51.069Z","lastSeenAt":"2026-04-24T11:31:43.377Z"}],"details":{"listingId":"08669d56-5521-44d0-9a0f-b66f12e5ac8c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/193 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/193"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/193"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium resource via x402 micropayment on Base","Agent-driven API consumption without API keys or subscriptions","Pay-per-use API calls settled in USDC on Base L2"],"bestFor":["Developers wanting key-free, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-network USDC wallet","High-volume callers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.526Z"},"updatedAt":"2026-04-24T11:31:43.377Z"}}