{"id":"85e56909-aa59-4ffd-b563-7ea14de3055e","shortId":"9wXQ53","kind":"x402","title":"Pay-per-call premium API endpoint on Base network via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base network via x402, settled in USDC at $0.02/request.","description":"This endpoint (endpoint-35) is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at /api/endpoint-35 is labeled \"Premium API Access\" but lacks detailed documentation about what it returns or what input it expects. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD per request) on Base. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe broader platform advertises 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 at the same $0.02 price point. However, the specific functionality of endpoint-35 is not documented on the site, and the docs/pricing/README pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["premium api","x402 endpoint","pay-per-call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["The specific functionality of /api/endpoint-35 is undocumented — 'Premium API Access' is the only descriptor available.","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no useful content.","No OpenAPI schema, no input/output examples, and no description of expected request body or response format."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-35","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-35","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what endpoint-35 actually does, no input/output schema, no examples, and the docs pages are empty. The listing is effectively a stub with confirmed 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'/api/endpoint-35':95 '/request':18,36 '0.02':17,35,135,188 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '20':129 '300':152 'accept':121 'access':100 'addit':217 'address':146 'advertis':157 'ai/ml':60 'analysi':166 'analyt':59 'api':6,24,56,82,99 'base':9,27,78,131,140 'base usdc api' 'base-network' 'broader':155 'call':4,22 'challeng':116 'charg':125 'classif':169 'collect':50 'commit':89 'confirm':117 'connect':212 'content':218 'convers':181 'data':58,162 'detail':103 'docs/pricing/readme':206 'document':104,200 'embed':170 'endpoint':7,25,38,39,67,93,158,196 'estim':178 'exchang':173 'expect':113 'export':163 'feed':172 'finance/web3':62 'function':194 'gas':177 'generat':183 'geocod':179 'howev':191 'infer':61 'infrastructur':64 'input':111 'insight':164 'key':83 'label':97 'lack':102 'limit':86 'live':120 'lowpaymentfee' 'lowpaymentfee.com':45 'maximum':127 'metric':160 'micropayment api' 'network':10,28,79 'no-api-key' 'offer':48 'page':207 'part':42 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-call api' 'pay-per-request':52 'payment':71,142 'per':3,21,54,137 'platform':46,156 'point':190 'post':122 'post-method' 'premium':5,23,98 'premium api' 'price':171,189 'prompt':214 'protocol':72 'quot':176 'rate':85,174 'render':209 'report':161 'request':55,123,138 'requir':90 'return':108 'second':153 'sent':144 'sentiment':165 'settl':13,31,73 'site':203 'span':57 'specif':92,193 'summar':168 'text':167 'timeout':150 'token':175 'unit':132 'usd':136 'usdc':15,33,75,134 'usdc-settlement' 'use':68 'util':65 'valid':180 'via':11,29 'wallet':213 'x402':12,30,70,115 'x402 endpoint' 'x402-payment'","prices":[{"id":"f5b6a115-775b-422f-a78c-50cab467fac5","listingId":"85e56909-aa59-4ffd-b563-7ea14de3055e","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-35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:53.210Z"}],"sources":[{"listingId":"85e56909-aa59-4ffd-b563-7ea14de3055e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:53.210Z","lastSeenAt":"2026-04-22T20:00:45.056Z"}],"details":{"listingId":"85e56909-aa59-4ffd-b563-7ea14de3055e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint charges a maximum of 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-35"},{"claim":"Platform advertises $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is sent to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300 second timeout","source_url":"https://lowpaymentfee.com/api/endpoint-35"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Integrating pay-as-you-go services without API key management","Agent-driven API consumption with on-chain payment settlement"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.455Z"},"updatedAt":"2026-04-22T20:00:45.056Z"}}