{"id":"2ed1682b-84a9-4798-aa00-88c0a585b38b","shortId":"bEmJCw","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/104` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is likely 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 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 broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas for this specific resource are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","post-method"],"categories":["infrastructure","utility"],"synonyms":["premium api","lowpaymentfee","x402 api","micropayment api","pay per call api","base network api","usdc api"],"warnings":["The exact functionality of /api/v1/generate/resource/104 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /api, /README) returned no useful content, only a 'Connect wallet' prompt.","No request body schema or response schema is available; callers must experiment to discover the API contract.","The platform lists many endpoints but none appear individually documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/104","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the purpose of resource/104 is entirely opaque. All doc pages returned only 'Connect wallet' with no 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'/api/v1/generate/resource/104':70 '/docs':195 '/pricing':196 '/readme':198 '/request':17,34,190 '0.02':16,33,129,189 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':121 '6':132 'accept':136 'access':76 'advertis':149,167 'ai/ml':59 'amount':116 'analysi':171 'analyt':58 'api':5,22,55,75,143 'application/json':141 'attach':152 'base':8,25,108,123 'base network api' 'beyond':84 'broader':165 'call':12,29,119 'caller':150 'classif':174 'collect':46 'connect':202 'content':208 'contract':112 'convers':182 'data':57,62 'decim':133 'detail':210 'document':83,193 'embed':175 'endpoint':6,23,36,98,135,168 'equal':128 'exact':79 'exchang':178 'feed':177 'finance/web3':61 'function':80 'gate':3,20 'generat':95,184 'geocod':180 'handl':101 'header':157 'infer':60 'infrastructur':64 'json-api' 'key':144 'label':86 'like':89 'limit':147 'list':72 'lowpaymentfee' 'lowpaymentfee.com':41 'maximum':115 'micropayment api' 'network':109 'no-api-key' 'offer':44 'one':90 'page':194 'part':38 'pay':10,27,52 'pay per call api' 'pay-per-cal':9,26 'pay-per-request':51 'payment':99,156,162 'per':11,28,53,118 'platform':42,93,166 'point':192 'post':137 'post-method' 'premium':4,21,74 'premium api' 'price':176,191 'prompt':204 'proof':163 'protocol':50,105 'rate':146,179 'request':54,138 'request/response':211 'requir':117 'resourc':68,216 'return':140,199 'schema':212 'sentiment':170 'simpli':151 'span':56 'specif':67,215 'substant':207 'summar':173 'text':172 'unavail':218 'unit':124 'usdc':14,31,111,126,130 'usdc api' 'usdc-base' 'use':110,131 'util':65,97 'valid':160,181 'via':102 'wallet':203 'x':155 'x-payment':154 'x402':2,19,49,104,161 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"60f87b93-a64f-4823-8d64-2b357a2a7cf7","listingId":"2ed1682b-84a9-4798-aa00-88c0a585b38b","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:16.090Z"}],"sources":[{"listingId":"2ed1682b-84a9-4798-aa00-88c0a585b38b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:16.090Z","lastSeenAt":"2026-04-28T17:34:18.443Z"}],"details":{"listingId":"2ed1682b-84a9-4798-aa00-88c0a585b38b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/104 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/104"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/104"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/104"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a generation or utility endpoint without subscription or API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need instant, keyless API access with crypto micropayments","Low-volume or sporadic usage where $0.02/call is more economical than a subscription"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call pricing adds up quickly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.401Z"},"updatedAt":"2026-04-28T17:34:18.443Z"}}