{"id":"6e0914b5-6e95-41f2-8d51-7137349ddd05","shortId":"TNnfNt","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource path (/api/v1/generate/resource/27) appears to be one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform are priced at $0.02 per request (20,000 base units of USDC on Base network, where USDC uses 6 decimals).\n\nThe endpoint accepts POST requests and returns application/json responses. Payment is settled on the Base L2 network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms the endpoint is live, with a max timeout of 300 seconds per request. No API keys or rate limits are advertised — access is purely pay-per-use via the x402 payment header.\n\nThe specific functionality behind resource/27 is not documented on the site. The platform lists various endpoint categories (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, geocoding, etc.) but the crawled documentation pages returned only \"Connect wallet\" with no further detail. Without additional documentation, the exact input/output schema for this particular resource cannot be determined.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/generate/resource/27 is undocumented — the endpoint title 'Premium API Access' is generic and uninformative.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no usable content.","No input or output schema is available; callers cannot determine what request body to send or what response to expect.","The platform lists many endpoint categories but it is unclear which, if any, are fully functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/27","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC per call on Base). However, there is no documentation for this specific resource (resource/27), no input/output schema, no examples, and the docs/pricing/API pages all returned only 'Connect wallet'. The actual functionality behind this endpoint is 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'/request':13,28 '0.02':12,27,82 '000':86 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '20':85 '300':133 '6':97 'Base network API' 'USDC micropayment API' 'accept':101 'access':7,22,38,145 'addit':199 'advertis':144 'ai':66 'analysi':177 'analyt':65 'api':6,21,37,138 'appear':49 'application/json':106 'base':9,24,87,92,113 'behind':160 'call':4,19 'cannot':209 'categori':62,173 'challeng':122 'classif':179 'confirm':123 'connect':192 'contract':118 'crawl':187 'crypto-paid API' 'data':64 'decim':98 'detail':197 'determin':211 'document':164,188,200 'embed':180 'endpoint':32,55,75,100,125,172 'etc':184 'exact':202 'feed':182 'financ':69 'function':159 'geocod':183 'header':156 'includ':63 'infrastructur':72 'input/output':203 'json-api' 'key':139 'l2':114 'learn':68 'limit':142 'list':170 'live':127 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':67 'mani':54 'max':130 'metric':174 'network':93,115 'no-api-key' 'no-rate-limit' 'offer':56 'one':52 'page':189 'particular':207 'path':47 'pay':2,17,149 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'pay-per-us':148 'payment':42,108,155 'per':3,18,83,135,150 'platform':59,78,169 'post':102 'premium':5,20,36 'premium API' 'price':80,181 'protocol':43 'provid':35 'pure':147 'rate':141 'report':175 'request':84,103,136 'resourc':46,208 'resource/27':161 'respons':107 'return':105,190 'schema':204 'second':134 'sentiment':176 'settl':110 'site':167 'span':61 'specif':45,158 'summar':178 'timeout':131 'unit':88 'usdc':15,30,90,95,117 'usdc-base' 'use':96,116,151 'util':73 'various':171 'via':10,25,39,152 'wallet':193 'web3':70 'without':198 'x402':11,26,41,121,154 'x402 endpoint' 'x402-payment'","prices":[{"id":"8b35e48c-ebad-4c56-a5c2-8f745157487b","listingId":"6e0914b5-6e95-41f2-8d51-7137349ddd05","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:02.879Z"}],"sources":[{"listingId":"6e0914b5-6e95-41f2-8d51-7137349ddd05","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:02.879Z","lastSeenAt":"2026-04-22T23:01:00.074Z"}],"details":{"listingId":"6e0914b5-6e95-41f2-8d51-7137349ddd05","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/27 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at 20000 base units (~$0.02)","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/27"},{"claim":"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/27"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","AI agents that need frictionless, keyless API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation and guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.077Z"},"updatedAt":"2026-04-22T23:01:00.074Z"}}