{"id":"468c1fa0-086d-4094-a51b-0a5c916b492f","shortId":"ErbLWJ","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/91` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals equals $0.02 USD per call. 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 platform's landing page lists sibling endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, 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, supported parameters, and detailed behavior of this specific resource remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["infrastructure","general"],"synonyms":["premium API","x402 API","pay-per-call API","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["The exact functionality of /api/v1/generate/resource/91 is unknown — 'Premium API Access' is the only description provided.","All documentation pages (/docs, /pricing, /api, /README) returned no useful content, only a 'Connect wallet' prompt.","No request or response schema is available; callers must discover behavior empirically.","The platform lists many endpoints but none appear to have public documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/91","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/91","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 the actual functionality behind \"Premium API Access\" resource/91 is completely undocumented. All doc pages return only a wallet-connect prompt with no schema, parameter, or response information. This is effectively a stub 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'/api/v1/generate/resource/91':70 '/docs':203 '/pricing':204 '/readme':206 '/request':17,34 '0.02':16,33,100,133 '000':125 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':124 '6':130 'Base network API' 'USDC micropayment API' 'accept':139 'access':76 'actual':220 'advertis':120,152 'ai/ml':59 'analysi':182 'analyt':58 'api':5,22,55,75,146 'application/json':144 'attach':155 'base':8,25,112,126 'behavior':227 'beyond':84 'call':12,29,136 'caller':153 'challeng':119 'classif':185 'collect':46 'connect':211 'content':217 'contract':116 'convers':197 'data':57,62,178 'decim':131 'detail':226 'document':83,201 'embed':186 'endpoint':6,23,36,92,138,174 'equal':132 'estim':194 'exact':79 'exchang':189 'export':179 'feed':188 'finance/web3':61 'function':80 'gas':193 'gate':3,20 'generat':199 'geocod':195 'handl':105 'header':160 'howev':200 'http-post' 'infer':60 'infrastructur':64 'insight':180 'json-response' 'key':147 'label':86 'land':170 'limit':150 'list':72,172 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':91 'maxamountrequir':122 'metric':176 'network':113 'offer':44 'one':89 'page':171,202 'paramet':224 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':103,159,165 'per':11,28,53,101,135 'platform':42,95,168 'post':140 'premium':4,21,74 'premium API' 'price':97,187 'prompt':213 'proof':166 'protocol':50,109 'quot':192 'rate':149,190 'remain':232 'report':177 'request':54,102,141 'request/response':221 'resourc':68,231 'return':143,208 'schema':222 'sentiment':181 'sibl':173 'simpli':154 'span':56 'specif':67,230 'substant':216 'summar':184 'support':223 'text':183 'token':191 'uniform':98 'unit':127 'unknown':233 'usd':134 'usdc':14,31,115 'usdc-base' 'use':114 'util':65 'valid':163,196 'via':106 'wallet':212 'x':158 'x-payment':157 'x402':2,19,49,108,164 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"2970f09b-755a-4f6b-ac06-563a24b5dd45","listingId":"468c1fa0-086d-4094-a51b-0a5c916b492f","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:04.617Z"}],"sources":[{"listingId":"468c1fa0-086d-4094-a51b-0a5c916b492f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:04.617Z","lastSeenAt":"2026-04-22T13:30:29.310Z"}],"details":{"listingId":"468c1fa0-086d-4094-a51b-0a5c916b492f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/91 \\\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 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/91"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/91"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-request patterns","Agents that can settle USDC payments on Base L2","Use cases requiring no API key signup or rate-limit negotiation"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch workloads where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.93Z"},"updatedAt":"2026-04-22T13:30:29.310Z"}}