{"id":"99c18d23-84b9-47ca-bc91-674c786bd734","shortId":"WQzkgU","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-call APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/176` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label.\n\nThe endpoint is live and returns a standard x402 payment challenge. It accepts POST requests and settles payments 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 payment scheme is \"exact,\" meaning each request requires a one-shot micropayment. No API keys, rate limits, or subscriptions are needed — access is granted purely via the x402 payment header.\n\nThe broader lowpaymentfee.com 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. 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 other endpoint remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["infrastructure","general"],"synonyms":["premium API","pay-per-call API","x402 micropayment API","lowpaymentfee","USDC API access","Base network API","crypto-paid API"],"warnings":["The exact functionality of /api/v1/generate/resource/176 is undocumented — 'Premium API Access' is the only label provided.","All documentation pages (/docs, /pricing, /api, /README) returned no substantive content, only a 'Connect wallet' prompt.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The platform lists many endpoints but none appear to have public documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/176","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/176","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 challenge, confirming pricing and payment details. However, there is no documentation, no request/response schema, and no description of what 'Premium API Access' at resource/176 actually does. All doc pages return only 'Connect wallet' with no 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'/api/v1/generate/resource/176':73 '/docs':201 '/pricing':202 '/readme':204 '/request':195 '0.02':10,28,131,194 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':123 '6':134 'Base network API' 'USDC API access' 'accept':102 'access':6,24,79,159 'actual':218 'advertis':172 'ai/ml':61 'amount':118 'analysi':176 'analyt':60 'api':5,16,23,34,57,78,151 'base':8,26,110,125 'base-network' 'beyond':87 'broader':169 'call':56,121 'challeng':100 'classif':179 'collect':48 'connect':209 'content':215 'contract':114 'convers':187 'crypto-paid API' 'data':59,65 'decim':135 'document':86,199 'embed':180 'endpoint':38,91,173,226 'equal':130 'exact':82,140 'exchang':183 'feed':182 'financ':63 'function':83 'gate':3,21 'generat':189 'geocod':185 'grant':161 'header':167 'howev':198 'infer':62 'infrastructur':67 'key':17,35,152 'label':89 'limit':154 'list':75 'live':93 'lowpaymentfee' 'lowpaymentfee.com':43,170 'maximum':117 'mean':141 'micropay':149 'need':158 'network':111 'no-api-key' 'offer':46 'one':147 'one-shot':146 'page':200 'part':40 'pay':9,27,54 'pay-per-cal':53 'pay-per-call API' 'pay-per-request' 'payment':99,107,137,166 'per':11,29,55,120 'platform':44,171 'point':197 'post':103 'post-endpoint' 'premium':4,22,77 'premium API' 'price':181,196 'prompt':211 'protocol':52 'pure':162 'rate':153,184 'remain':227 'request':12,30,104,143 'request/response':219 'requir':18,36,119,144 'resourc':71 'return':95,206 'schema':220 'scheme':138 'sentiment':175 'settl':106 'shot':148 'span':58 'specif':70 'standard':97 'subscript':156 'substant':214 'summar':178 'text':177 'unit':126 'unknown':228 'usdc':14,32,113,128,132 'usdc-settlement' 'use':112,133 'util':68 'valid':186 'via':163 'wallet':210 'web3':64 'x402':2,20,51,98,165 'x402 micropayment API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':50","prices":[{"id":"d7e29d38-1ce6-405f-b64d-1998e2c1b4a1","listingId":"99c18d23-84b9-47ca-bc91-674c786bd734","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/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:05.516Z"}],"sources":[{"listingId":"99c18d23-84b9-47ca-bc91-674c786bd734","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/176","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:05.516Z","lastSeenAt":"2026-04-22T12:03:15.721Z"}],"details":{"listingId":"99c18d23-84b9-47ca-bc91-674c786bd734","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/176 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/176"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/176"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API resource without needing to register or manage API keys","Making one-off paid API calls settled in USDC on Base L2","Integrating agent-purchasable endpoints into automated workflows"],"bestFor":["Developers who want zero-friction, keyless API access via crypto micropayments","AI agents that can autonomously pay for API calls using x402","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without access to USDC on the Base network","Use cases requiring free or subscription-based pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.023Z"},"updatedAt":"2026-04-22T12:03:15.721Z"}}