{"id":"73aaf819-44ac-4ac8-93fe-c8edf3e7e39f","shortId":"Bx9frB","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/cards/86` 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 `/cards/86` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 exact-payment scheme. The probe confirmed the endpoint is live, returning a 402 challenge with `maxAmountRequired` of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts POST requests and returns `application/json`. No OpenAPI schema, detailed documentation, or example request/response payloads were found — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause the specific behavior of `/api/v1/cards/86` is undocumented and the \"Premium API Access\" label is generic, agents should treat this as a low-information endpoint. The broader platform lists many other endpoints (analytics, AI, finance, utilities) all at the same price point, but none have published schemas or usage examples.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api","misc"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The specific functionality of /api/v1/cards/86 is completely undocumented — 'Premium API Access' is a generic label with no further explanation.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","The broader platform lists many endpoints but none have published schemas or usage examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/86","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/cards/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of /api/v1/cards/86 is entirely unclear beyond the generic label 'Premium API Access'. This is effectively a stub 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'/cards/86':66 '0.02':10,24,87,140 '000':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':134 '402':129 '6':143 'Base network API' 'USDC micropayment API' 'accept':147 'access':71,101,193 'addit':179 'advertis':84 'agent':197 'ai':215 'ai/ml':55 'analyt':54,214 'api':5,19,51,70,94,168,192 'application/json':152 'base':8,22,107,136 'base-network' 'behavior':184 'beyond':79 'broader':208 'challeng':130 'collect':42 'confirm':122 'connect':174 'content':180 'contract':111 'data':53,58 'decim':144 'detail':156 'doc':165 'document':78,157 'endpoint':6,20,30,124,146,206,213 'equal':139 'exact':74,117 'exact-pay':116 'exampl':159,231 'financ':216 'finance/web3':57 'flat':86 'found':163 'function':75 'gate':3,17 'generic':196 'infer':56 'inform':205 'infrastructur':60 'instant':100 'json-response' 'key':95 'label':68,81,194 'limit':98 'list':210 'live':126 'low':204 'low-inform':203 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':211 'maxamountrequir':132 'model':91 'network':108 'no-api-key' 'none':225 'offer':40 'openapi':154 'page':169 'part':34 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payload':161 'payment':102,118 'per':11,25,49,88 'platform':38,83,209 'point':223 'post':148 'premium':4,18,69,191 'premium API' 'price':90,166,222 'probe':121 'prompt':176 'protocol':46 'publish':227 'rate':97 'render':171 'request':12,26,50,89,149 'request/response':160 'resourc':64 'return':127,151 'schema':155,228 'scheme':119 'settl':104 'span':52 'specif':63,183 'treat':199 'undocu':188 'unit':137 'usag':230 'usdc':14,28,110,141 'usdc-settlement' 'use':109,142 'util':61,217 'via':113 'wallet':175 'x402':2,16,45,115 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"b5b1d668-cf45-4e60-86fe-55c450494c65","listingId":"73aaf819-44ac-4ac8-93fe-c8edf3e7e39f","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/cards/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:57.011Z"}],"sources":[{"listingId":"73aaf819-44ac-4ac8-93fe-c8edf3e7e39f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:57.011Z","lastSeenAt":"2026-04-22T10:31:29.689Z"}],"details":{"listingId":"73aaf819-44ac-4ac8-93fe-c8edf3e7e39f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/86 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/86"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/86"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium data or service endpoint with per-request USDC micropayments","Integrating x402-compatible agents that can autonomously pay for API calls","Testing x402 payment flows on the Base network"],"bestFor":["Agents with x402 payment capability on Base","Developers exploring x402 pay-per-request patterns","Low-volume, no-commitment API consumption without API keys"],"notFor":["Users who need detailed API documentation or schemas before calling","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.771Z"},"updatedAt":"2026-04-22T10:31:29.689Z"}}