{"id":"4b3f32ce-65fc-4438-925d-6a450cb30f4b","shortId":"bTYsRP","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com exposes a POST resource at `/api/v1/cards/45/transactions` behind an x402 payment challenge. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint probed (`/api/v1/cards/45/transactions`) is labeled \"Premium API Access\" in the x402 challenge. Its exact functionality is not documented beyond the title; the path suggests it returns or creates transactions associated with a card resource (card ID 45). No request body schema or response schema is published, and the site's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…on Base, 6 decimals) — i.e., $0.02 per call. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. No API keys or rate limits are advertised. Because there is no OpenAPI spec, no request/response examples, and no documentation beyond the landing page listing, the actual behavior of this endpoint remains opaque.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 USDC endpoint","lowpaymentfee API","pay-per-call transactions","Base network API","micropayment API"],"warnings":["No request or response schema is published; actual endpoint behavior is unknown.","Docs, pricing, and API pages render only 'Connect wallet' with no usable content.","The endpoint path references a specific card ID (45) — unclear if this is a demo or production resource.","No OpenAPI or machine-readable specification available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/45/transactions","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/45/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on request/response schemas, no OpenAPI spec, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint is unclear beyond its path and 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'0.02':11,26,75,183 '000':172 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':190 '0x8335':177 '20':171 '300':193 '45':123 '6':180 'Base network API' 'accept':161 'access':94 'actual':222 'advertis':203 'ai/ml':65 'analyt':64 'api':61,93,140,197 'associ':116 'base':9,24,83,173,179 'behavior':223 'behind':41 'beyond':105,216 'bodi':126 'broader':51 'call':60,185 'card':5,20,119,121 'card transactions API' 'card-transact':4,19 'card-transactions' 'challeng':45,98,155 'confirm':156 'connect':146 'creat':114 'data':63,68 'decim':181 'detail':152 'doc':137 'document':104,215 'dozen':55 'endpoint':7,22,32,87,158,226 'exact':100 'exampl':212 'expos':35 'finance/web3':67 'function':101 'gate':3,18 'i.e':182 'id':122 'infer':66 'infrastructur':70 'key':198 'label':91 'land':218 'limit':201 'list':220 'live':160 'lowpaymentfee API' 'lowpaymentfee.com':34 'micropayment API' 'network':84 'offer':54 'opaqu':228 'openapi':208 'page':141,219 'part':48 'path':109 'pay':10,25,58 'pay-per-cal':57 'pay-per-call transactions' 'pay-per-request' 'payment':44,167,186 'per':12,27,59,76,184 'platform':52 'post':37,162 'post-endpoint' 'premium':92 'price':73,138 'probe':88 'prompt':148 'publish':132 'rate':200 'remain':227 'render':143 'request':13,28,77,125,163 'request/response':211 'requir':165 'resourc':38,120 'respons':129 'return':112 'schema':127,130 'second':194 'sent':188 'settl':78 'site':135 'span':62 'spec':209 'specif':86 'suggest':110 'timeout':195 'titl':107 'transact':6,21,115 'unit':174 'usdc':15,30,80,176 'usdc-base' 'util':71 'wallet':147 'x402':2,17,43,97,154 'x402 USDC endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"6a16a6cf-ede3-4945-9eeb-a85604e6cece","listingId":"4b3f32ce-65fc-4438-925d-6a450cb30f4b","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/45/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:37.591Z"}],"sources":[{"listingId":"4b3f32ce-65fc-4438-925d-6a450cb30f4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/45/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:37.591Z","lastSeenAt":"2026-04-24T18:32:22.654Z"}],"details":{"listingId":"4b3f32ce-65fc-4438-925d-6a450cb30f4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/45/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/45/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/45/transactions"}],"useCases":["Fetching or creating card transaction records via a single paid POST call","Integrating pay-per-use card data into agent workflows without API keys","Programmatic access to card-level transaction data settled in USDC on Base"],"bestFor":["Agents that can settle x402 USDC payments on Base","Developers wanting keyless, pay-per-call access to card transaction data","Prototyping micropayment-gated API integrations"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume batch processing where per-call pricing is impractical","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.743Z"},"updatedAt":"2026-04-24T18:32:22.654Z"}}