{"id":"ae93cda9-ecb6-4285-909b-b7d76342a592","shortId":"Qgnjk4","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/109` 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 20000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint accepts HTTP POST requests and returns application/json. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what \"Premium API Access\" actually returns. The platform's landing page lists sibling endpoints (sentiment analysis, summarization, geocoding, etc.) but resource/109 does not map clearly to any of those named services. Prospective callers should be aware that without documentation, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","x402 api","pay per call api","USDC micropayment api","base network api","premium api access","402 payment endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","The exact functionality of resource/109 ('Premium API Access') is completely undocumented; callers cannot know what they are paying for.","No OpenAPI schema or request/response examples are provided.","No robots.txt or agents.txt found on the origin."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/109","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/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, no examples, and the docs pages are empty. This is effectively a stub 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'/api/v1/generate/resource/109':70 '/docs':172 '/pricing':173 '/readme':176 '/request':17,34 '0.02':16,33,100,132 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20000':124 '402 payment endpoint' '6':129 'USDC micropayment api' 'accept':138 'access':76,204 'actual':205,241 'advertis':120 'ai/ml':59 'analysi':216 'analyt':58 'api':5,22,55,75,146,203 'application/json':144 'attach':155 'awar':236 'base':8,25,112,125 'base network api' 'base-network' 'behavior':242 'beyond':84 'call':12,29,135 'caller':153,233 'challeng':119 'clear':225 'collect':46 'connect':182 'content':188 'contract':116 'data':57,62 'decim':130 'descript':199 'document':83,167,239 'endpoint':6,23,36,92,137,214,245 'equal':131 'etc':219 'exact':79 'exampl':196 'extrem':169 'finance/web3':61 'function':80 'gate':3,20 'geocod':218 'handl':105 'header':160 'http':139 'http-post' 'infer':60 'infrastructur':64 'json-response' 'key':147 'label':86 'land':210 'limit':150 'list':72,212 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':91 'map':224 'maxamountrequir':122 'name':230 'network':113 'offer':44 'one':89 'openapi':192 'page':177,211 'part':38 'pay':10,27,52 'pay per call api' 'pay-per-cal':9,26 'pay-per-request':51 'payment':103,159,165 'per':11,28,53,101,134 'platform':42,95,208 'post':140 'premium':4,21,74,202 'premium api access' 'price':97 'prompt':184 'proof':166 'prospect':232 'protocol':50,109 'rate':149 'render':179 'request':54,102,141 'request/response':195 'requir':152 'resourc':68 'resource/109':221 'return':143,206 'schema':193 'sentiment':215 'servic':231 'sibl':213 'simpli':154 'span':56 'spars':170 'specif':67 'summar':217 'uniform':98 'unit':126 'unknown':247 'usd':133 'usdc':14,31,115 'usdc-settlement' 'use':114 'util':65 'valid':163 'via':106 'wallet':183 'without':238 'x':158 'x-payment':157 'x402':2,19,49,108,164 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"ea9b9703-f476-4524-bc86-0fa93f057b60","listingId":"ae93cda9-ecb6-4285-909b-b7d76342a592","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/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:03.117Z"}],"sources":[{"listingId":"ae93cda9-ecb6-4285-909b-b7d76342a592","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/109","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:03.117Z","lastSeenAt":"2026-04-22T21:30:34.395Z"}],"details":{"listingId":"ae93cda9-ecb6-4285-909b-b7d76342a592","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/109 \\\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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/109"},{"claim":"All APIs 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/109"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic pay-per-call access to an undocumented premium resource","Agent-driven API consumption without API keys or subscriptions","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can handle x402 challenges natively on Base/USDC","Users who want zero-commitment, no-signup API access"],"notFor":["Anyone needing documented, predictable API behavior before paying","Production systems requiring SLAs, rate-limit guarantees, or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.143Z"},"updatedAt":"2026-04-22T21:30:34.395Z"}}