{"id":"8c5f0540-918f-4e38-9020-c634bd3a20be","shortId":"hrKqar","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at `/api/endpoint-74` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Each call is settled on the Base network using USDC (contract `0x8335…2913`) through the x402 protocol — no API keys, no rate limits, and no upfront commitments required.\n\nThe specific endpoint `/api/endpoint-74` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The site's broader catalog includes endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all priced at $0.02 per request. The x402 challenge confirms a `maxAmountRequired` of 20,000 base units of USDC (6 decimals), which equals $0.02.\n\nThe endpoint accepts HTTP POST requests and returns `application/json`. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve but contain only a \"Connect wallet\" prompt, providing no further technical detail about request/response schemas or the specific capability of endpoint-74.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["premium API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","402 payment API"],"warnings":["The exact functionality of /api/endpoint-74 is unknown — 'Premium API Access' is the only description provided.","All documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no usable content.","No request or response schema is available; consumers cannot know what to send or expect back.","This endpoint path does not appear in the site's listed API catalog, which uses /api/v1/ and /api/v2/ prefixes."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-74","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/endpoint-74","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 confirms pricing and network details, but the specific functionality of endpoint-74 is completely undocumented. All doc pages return only 'Connect wallet' with no schema, examples, or description of what the endpoint actually does. This is effectively a stub 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'/api':185 '/api/endpoint-74':41,99 '/docs':183 '/pricing':184 '/readme':186 '/request':17,34 '0.02':16,33,151,171 '000':162 '0x8335':79 '20':161 '2913':80 '402 payment API' '6':167 'Base network API' 'USDC micropayment API' 'accept':174 'access':105 'ai/ml':61 'analysi':130 'analyt':60 'api':6,23,57,86,104 'application/json':180 'base':9,26,74,163 'base-network' 'beyond':113 'broader':119 'call':4,21,69 'capabl':207 'catalog':120 'challeng':156 'classif':133 'collect':51 'commit':94 'confirm':157 'connect':193 'contain':190 'contract':78 'convers':145 'data':59,64,126 'decim':168 'detail':200 'document':112,181 'embed':134 'enabl':38 'endpoint':7,24,39,98,122,173,209 'equal':170 'estim':142 'exact':108 'exchang':137 'export':127 'feed':136 'finance/web3':63 'function':109 'gas':141 'generat':147 'geocod':143 'http':175 'http-post' 'includ':121 'infer':62 'infrastructur':66 'insight':128 'json-response' 'key':87 'label':115 'limit':90 'list':101 'lowpaymentfee' 'lowpaymentfee.com':46 'maxamountrequir':159 'metric':124 'network':75 'offer':49 'page':182 'part':43 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':53 'per':3,20,55,152 'platform':47 'post':176 'premium':5,22,103 'premium API' 'price':135,149 'prompt':195 'protocol':84 'provid':196 'quot':140 'rate':89,138 'report':125 'request':56,153,177 'request/response':202 'requir':95 'resolv':188 'return':179 'schema':203 'sentiment':129 'settl':12,29,71 'site':117 'span':58 'specif':97,206 'summar':132 'technic':199 'text':131 'token':139 'unit':164 'upfront':93 'usdc':14,31,77,166 'usdc-settlement' 'use':76 'util':67 'valid':144 'via':10,27 'wallet':194 'x402':11,28,37,83,155 'x402 endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"1fe62ee0-b21c-4554-8de8-0f0a53605997","listingId":"8c5f0540-918f-4e38-9020-c634bd3a20be","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/endpoint-74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:05.480Z"}],"sources":[{"listingId":"8c5f0540-918f-4e38-9020-c634bd3a20be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:05.480Z","lastSeenAt":"2026-04-23T02:00:22.186Z"}],"details":{"listingId":"8c5f0540-918f-4e38-9020-c634bd3a20be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-74"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-74"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages resolve but contain only 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven API consumption with automatic per-call USDC micropayments","Accessing premium data or services without API key registration","Programmatic pay-as-you-go access to utility endpoints on Base"],"bestFor":["Developers or agents wanting keyless, pay-per-request API access","x402-compatible clients settling micropayments in USDC on Base","Low-commitment, no-subscription API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who prefer bulk pricing or subscription plans","Anyone unable to settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:03:05.835Z"},"updatedAt":"2026-04-23T02:00:22.186Z"}}