{"id":"6091fe36-ef90-49a0-9e2b-1f03a72faf94","shortId":"cL69s2","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, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/49` 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 sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation. However, documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this or any endpoint remain unknown. Without documentation or example payloads, it is unclear what inputs this endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","post-method"],"categories":["api","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["Endpoint functionality is entirely undocumented — 'Premium API Access' is the only description available","All documentation pages (/docs, /api, /pricing, /README) returned no useful content, only 'Connect wallet'","No request or response schema is available; callers cannot know what to send or expect back","The resource path '/api/v1/generate/resource/49' does not match any of the named endpoints on the landing page, suggesting it may be a generic or placeholder resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/49","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/49","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 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality (\"Premium API Access\" for resource/49) is completely opaque. All doc pages return only a wallet-connect 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'/api/v1/generate/resource/49':69 '/docs':193 '/pricing':195 '/readme':196 '/request':17,34 '0.02':16,33,99,132 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':116 '20':123 '6':129 'Base network API' 'USDC API' 'accept':138 'access':75 'actual':210 'advertis':119,151 'ai/ml':59 'analysi':176 'analyt':58 'api':5,22,55,74,145 'application/json':143 'attach':154 'base':8,25,111,125 'base-network' 'beyond':83 'call':12,29,135 'caller':152 'challeng':118 'classif':179 'collect':46 'connect':201 'content':207 'contract':115 'convers':187 'data':57 'decim':130 'document':82,191,221 'embed':180 'endpoint':6,23,36,91,137,173,217,231 'equal':131 'exact':78 'exampl':223 'exchang':183 'expect':232 'feed':182 'finance/web3':61 'function':79 'gate':3,20 'generat':189 'geocod':185 'handl':104 'header':159 'howev':190 'infer':60 'infrastructur':63 'input':229 'json-api' 'key':146 'label':85 'land':169 'limit':149 'list':71,171 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':90 'maxamountrequir':121 'micropayment API' 'network':112 'offer':44 'one':88 'page':170,192 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payload':224 'payment':102,158,164 'per':11,28,53,100,134 'platform':42,94,167 'post':139 'post-method' 'premium':4,21,73 'premium API' 'price':96,181 'prompt':203 'proof':165 'protocol':50,108 'rate':148,184 'remain':218 'request':54,101,140 'request/response':211 'resourc':67 'return':142,198,236 'schema':212 'sentiment':175 'sibl':172 'simpli':153 'span':56 'specif':66 'substant':206 'summar':178 'text':177 'unclear':227 'uniform':97 'unit':126 'unknown':219 'usd':133 'usdc':14,31,114 'usdc-settlement' 'use':113 'util':64 'valid':162,186 'via':105 'wallet':202 'without':220 'x':157 'x-payment':156 'x402':2,19,49,107,163 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"689c412b-9622-467e-ac50-fc2b08bf84b0","listingId":"6091fe36-ef90-49a0-9e2b-1f03a72faf94","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:50.020Z"}],"sources":[{"listingId":"6091fe36-ef90-49a0-9e2b-1f03a72faf94","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:50.020Z","lastSeenAt":"2026-04-22T21:30:33.446Z"}],"details":{"listingId":"6091fe36-ef90-49a0-9e2b-1f03a72faf94","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/49 \\\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 platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/49"}],"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 experimenting with x402 pay-per-request patterns","Agents that can settle USDC payments on Base L2","Use cases requiring no API key signup or subscription commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring known, well-documented request/response schemas","High-volume use cases where per-call pricing may be inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.776Z"},"updatedAt":"2026-04-22T21:30:33.446Z"}}