{"id":"527a54f9-be2f-4057-bc51-d9d54669c523","shortId":"vexL9j","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 & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/179` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It may correspond to 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 data generation — all at the same $0.02/request price point. Documentation pages exist but returned only a \"Connect wallet\" prompt with no substantive content during the crawl, so detailed request/response schemas 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","pay-per-call API","Base USDC API","micropayment API","resource generation"],"warnings":["The exact functionality of /api/v1/generate/resource/179 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /api, /pricing, /README) returned no substantive content during crawl.","No request or response schema is available; callers must discover the API contract by experimentation.","The platform lists many endpoints but it is unclear whether they all return real, production-quality data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/179","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the exact purpose of resource/179 is unknown. All doc pages returned only 'Connect wallet' with no 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'/request':17,34,193 '0.02':16,33,131,192 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':123 '6':134 'Base USDC API' 'accept':138 'access':77 'advertis':151,169 'ai':59 'amount':118 'analysi':173 'analyt':58 'api':5,22,55,76,145 'application/json':143 'attach':154 'base':8,25,110,125 'beyond':85 'broader':167 'call':12,29,121 'caller':152 'classif':176 'collect':46 'connect':203 'content':209 'contract':114 'convers':184 'correspond':90 'crawl':212 'data':57,186 'decim':135 'detail':214 'document':84,196 'embed':177 'endpoint':6,23,36,100,137,170 'equal':130 'exact':80 'exchang':180 'exist':198 'feed':179 'financ':62 'function':81 'gate':3,20 'generat':97,187 'geocod':182 'handl':103 'header':159 'infrastructur':65 'json-api' 'key':146 'label':87 'learn':61 'limit':149 'list':73 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':60 'maximum':117 'may':89 'micropayment API' 'network':111 'no-api-key' 'offer':44 'one':92 'page':197 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':101,158,164 'per':11,28,53,120 'platform':42,95,168 'point':195 'post':139 'post-method' 'premium':4,21,75 'premium API' 'price':178,194 'prompt':205 'proof':165 'protocol':50,107 'rate':148,181 'request':54,140 'request/response':215 'requir':119 'resourc':69 'resource generation' 'return':142,200 'schema':216 'sentiment':172 'simpli':153 'span':56 'specif':68 'substant':208 'summar':175 'text':174 'unavail':218 'unit':126 'usdc':14,31,113,128,132 'usdc-base' 'use':112,133 'util':66,99 'valid':162,183 'via':104 'wallet':204 'web3':63 'x':157 'x-payment':156 'x402':2,19,49,106,163 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"d7d391f2-32ff-4f4c-81bf-9163c2e1196b","listingId":"527a54f9-be2f-4057-bc51-d9d54669c523","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:26.772Z"}],"sources":[{"listingId":"527a54f9-be2f-4057-bc51-d9d54669c523","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:26.772Z","lastSeenAt":"2026-04-28T12:33:33.676Z"}],"details":{"listingId":"527a54f9-be2f-4057-bc51-d9d54669c523","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/179 \\\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/179"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals), equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/179"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/179"}],"useCases":["Accessing a pay-per-call utility or generation endpoint without needing API keys or subscriptions","Integrating x402-based micropayment APIs into agent workflows on the Base network","Programmatic access to platform services with instant USDC settlement"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Projects needing low-cost per-request utility endpoints"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-throughput use cases where per-request crypto payment overhead is impractical","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.888Z"},"updatedAt":"2026-04-28T12:33:33.676Z"}}