{"id":"51f0e6d5-f90a-4a3a-b85b-7dd9e227f7f2","shortId":"6JsByp","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-based card transactions API at `/api/v1/cards/22/transactions`. It is part of a broader platform that offers dozens of x402-gated endpoints 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 listed here (`/api/v1/cards/22/transactions`) is labeled \"Premium API Access\" in the x402 challenge but lacks detailed documentation about what it returns or what input it expects. The x402 challenge confirms it is live, accepts POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) to the payee address 0x1A2B…85F3. The payment timeout is 300 seconds.\n\nThe provider's landing page advertises a simple pay-per-use model with no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this particular endpoint is unknown. The endpoint path suggests it may relate to card transaction data or processing, but this is speculative based solely on the URL structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","post-endpoint","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","payment processing","x402 API","USDC micropayment","Base network API","lowpaymentfee","card data endpoint"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet'","Request and response schemas are completely unknown","The endpoint path '/api/v1/cards/22/transactions' suggests card-related functionality but this is unconfirmed","This specific endpoint is not listed on the provider's landing page among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/22/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/22/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 request/response schemas, no OpenAPI spec, and all doc pages return only 'Connect wallet'. The endpoint path and 'Premium API Access' label give almost no information about actual 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'/api/v1/cards/22/transactions':44,88 '/docs':178 '/pricing':179 '/readme':181 '0.02':11,26,73,139 '000':128 '0x1a2b':144 '0x8335':133 '20':127 '2913':134 '300':150 '6':137 '85f3':145 'Base network API' 'USDC micropayment' 'accept':118 'access':93,174 'actual':195 'address':143 'advertis':157 'ai/ml':63 'analyt':62 'api':42,92,167 'base':9,24,39,81,129,136,221 'base-network' 'broader':50 'card':5,20,40,212 'card data endpoint' 'card transactions API' 'card-transact':4,19 'challeng':97,113 'confirm':114 'connect':186 'content':192 'data':61,66,214 'decim':138 'detail':100 'document':101,176 'dozen':54 'endpoint':7,22,32,59,85,201,205 'exact':124 'expect':110 'expos':35 'finance/web3':65 'gate':3,18,58 'howev':175 'infer':64 'infrastructur':68 'input':108 'instant':173 'key':168 'label':90 'lack':99 'land':155 'limit':171 'list':86 'live':117 'lowpaymentfee' 'lowpaymentfee.com':34 'may':209 'model':164 'network':82 'no-api-key' 'offer':53 'page':156,177 'part':47 'particular':200 'path':206 'pay':10,25,161 'pay-per-request' 'pay-per-us':160 'paye':142 'payment':125,147 'payment processing' 'per':12,27,74,162 'platform':51 'post':38,119 'post-bas':37 'post-endpoint' 'premium':91 'price':71 'process':216 'prompt':188 'provid':153 'rate':170 'relat':210 'request':13,28,75,120 'request/response':196 'requir':122 'return':105,183 'schema':197 'second':151 'settl':76 'simpl':159 'sole':222 'span':60 'specif':84 'specul':220 'structur':226 'substant':191 'suggest':207 'timeout':148 'transact':6,21,41,213 'unit':130 'unknown':203 'url':225 'usdc':15,30,78,132 'usdc-settlement' 'use':163 'util':69 'wallet':187 'x402':2,17,57,96,112 'x402 API' 'x402-gated':1,16,56 'x402-payment'","prices":[{"id":"8b617908-ccf2-40b8-96ee-54a8a2fc2442","listingId":"51f0e6d5-f90a-4a3a-b85b-7dd9e227f7f2","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/22/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":"2026-04-18T18:43:23.782Z"}],"sources":[{"listingId":"51f0e6d5-f90a-4a3a-b85b-7dd9e227f7f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/22/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:23.782Z","lastSeenAt":"2026-04-24T21:03:01.571Z"}],"details":{"listingId":"51f0e6d5-f90a-4a3a-b85b-7dd9e227f7f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/22/transactions \\\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 (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/22/transactions"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying or submitting card transaction data via a pay-per-call model","Integrating card transaction functionality into agent workflows without API key management","Programmatic access to card-related operations settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use card transaction access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-friction API access without subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.421Z"},"updatedAt":"2026-04-24T21:03:01.571Z"}}