{"id":"13c59900-e1f8-4858-8d10-6893bfec2f8e","shortId":"UpTLZA","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 card-transactions resource at `/api/v1/cards/8/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 and settled in USDC on the Base network.\n\nThe specific endpoint listed here accepts HTTP POST requests and returns JSON. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. No API keys or rate limits are advertised; access is granted purely through on-chain micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/cards/8/transactions` resource actually returns or what POST body it expects. The endpoint name suggests card transaction data, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","card-transactions","http-post","json-response"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","402 payment required API","card data endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; the purpose and expected input of /api/v1/cards/8/transactions is unknown.","The endpoint path references a hardcoded card ID (8), which may indicate a demo or placeholder resource.","Cannot confirm what data is returned or what POST body is expected."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/8/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/8/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The specific resource path (/cards/8/transactions) is not explained anywhere in the crawled 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'/cards/8/transactions':196 '0.02':11,26,77,122 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':108 '300':140 '402 payment required API' '6':118 'Base network API' 'USDC pay-per-call' 'accept':93 'access':150 'actual':198 'address':134 'advertis':103,149 'ai/ml':67 'amount':106 'analyt':66 'api':63,143,166 'asset':114 'avail':219 'base':9,24,86,110 'base-network' 'behind':43 'bodi':203 'broader':53 'call':62,124 'cannot':215 'card':5,20,38,210 'card data endpoint' 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'chain':157 'challeng':47,102 'confirm':217 'connect':175 'content':181 'crawl':164 'data':65,70,212 'decim':119 'descript':192 'doc':165 'document':159 'dozen':57 'endpoint':7,22,32,90,207 'equat':120 'exact':131 'exampl':189 'expect':205 'expos':35 'extrem':161 'finance/web3':69 'gate':3,18 'grant':152 'http':94 'http-post' 'infer':68 'infrastructur':72 'json':99 'json-response' 'key':144 'limit':147 'list':91 'lowpaymentfee' 'lowpaymentfee.com':34 'made':127 'materi':220 'maximum':105 'micropay':158 'name':208 'network':87 'offer':56 'on-chain':155 'openapi':185 'page':170 'part':50 'pay':10,25,60 'pay-per-cal':59 'pay-per-request' 'payment':46,125 'per':12,27,61,78,123 'platform':54 'post':95,202 'price':75,167 'prompt':177 'pure':153 'rate':146 'readm':169 'render':172 'request':13,28,79,96 'request/response':188 'resourc':40,197 'return':98,199 'schema':186 'scheme':132 'second':141 'settl':81 'span':64 'spars':162 'specif':89 'suggest':209 'timeout':138 'transact':6,21,39,211 'unit':111 'usdc':15,30,83,113 'usdc-micropayment' 'use':117 'util':73 'via':128 'wallet':176 'x402':2,17,45,101,130 'x402 micropayment API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"bd1a71e2-8330-449a-928d-615ee621e9f3","listingId":"13c59900-e1f8-4858-8d10-6893bfec2f8e","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/8/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":"2026-04-18T18:44:03.103Z"}],"sources":[{"listingId":"13c59900-e1f8-4858-8d10-6893bfec2f8e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/8/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:03.103Z","lastSeenAt":"2026-04-24T14:32:42.969Z"}],"details":{"listingId":"13c59900-e1f8-4858-8d10-6893bfec2f8e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/8/transactions \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/8/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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout using the exact scheme","source_url":"https://lowpaymentfee.com/api/v1/cards/8/transactions"}],"useCases":["Retrieving card transaction records via a single micropayment","Programmatic access to card-level transaction data without API key management","Agent-driven financial data retrieval settled on-chain"],"bestFor":["Developers wanting keyless, pay-per-call access to card transaction data","AI agents that can settle x402 USDC payments on Base","Users who prefer no-subscription, usage-based pricing"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume batch processing where per-call micropayments add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.512Z"},"updatedAt":"2026-04-24T14:32:42.969Z"}}