{"id":"90e7782f-3411-42dc-bb7b-0c1f4d53acb0","shortId":"GJFDS6","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a POST resource at `/api/v1/cards/48/transactions` behind an x402 payment challenge. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 protocol on the Base network, settled in USDC.\n\nThe specific endpoint listed here is described only as \"Premium API Access\" with no further documentation on its request or response schema. The x402 challenge confirms the endpoint is live and accepts payments of up to 20,000 base units of USDC (0.02 USD) per request, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The path `/api/v1/cards/48/transactions` suggests it returns transaction data for a specific card resource (card ID 48), but no schema, example payloads, or detailed docs were found in the crawl.\n\nThe platform advertises $0.02 per request across all endpoints, no API keys, no rate limits, and instant access. However, the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no substantive content, so there is very little information about what this endpoint actually returns or what input it expects beyond a POST request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card data","lowpaymentfee API","USDC pay-per-call","Base network API","card 48 transactions","premium API access"],"warnings":["No request or response schema available — the endpoint's actual behavior is unknown","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content","The path '/api/v1/cards/48/transactions' suggests card-specific transaction data but this is inferred solely from the URL; no confirmation exists","The description 'Premium API Access' is generic and does not clarify what data or functionality is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/48/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/48/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC per call on Base), but there is no documentation, no request/response schema, no examples, and the endpoint's actual functionality is only vaguely implied by its URL path. Docs pages returned only 'Connect wallet' with no 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'0.02':128,170 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '20':122 '48':153 'Base network API' 'USDC pay-per-call' 'accept':117 'access':97,184 'across':173 'actual':213 'address':134 'advertis':169 'ai/ml':66 'analyt':65 'api':62,96,177,190 'base':9,24,81,124,137 'base-network' 'behind':41 'beyond':220 'broader':51 'call':13,28 'card':5,20,149,151 'card 48 transactions' 'card transactions API' 'card-transact':4,19 'card-transactions' 'challeng':45,110 'confirm':111 'connect':196 'content':202 'crawl':166 'data':64,69,145 'describ':92 'detail':160 'doc':161,187 'document':101 'dozen':56 'endpoint':7,22,32,88,113,175,212 'exampl':157 'expect':219 'expos':35 'finance/web3':68 'found':163 'gate':3,18,74 'howev':185 'id':152 'infer':67 'inform':208 'infrastructur':71 'input':217 'instant':183 'key':178 'limit':181 'list':89 'littl':207 'live':115 'lowpaymentfee API' 'lowpaymentfee.com':34,53 'network':82 'offer':55 'page':191 'paid':132 'part':48 'path':139 'pay':11,26,59 'pay-per-cal':10,25 'pay-per-request':58 'payload':158 'payment':44,118 'per':12,27,60,130,171 'platform':52,168 'post':37,222 'post-endpoint' 'premium':95 'premium API access' 'price':188 'prompt':198 'protocol':78 'rate':180 'render':193 'request':61,104,131,172,223 'resourc':38,150 'respons':106 'return':143,214 'schema':107,156 'settl':83 'span':63 'specif':87,148 'substant':201 'suggest':141 'transact':6,21,144 'unit':125 'usd':129 'usdc':15,30,85,127 'usdc-settlement' 'util':72 'via':75 'wallet':197 'x402':2,17,43,77,109 'x402 card data' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"8f3d2a95-1404-4cdc-be79-2c239668a077","listingId":"90e7782f-3411-42dc-bb7b-0c1f4d53acb0","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/48/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":"2026-04-18T18:43:35.815Z"}],"sources":[{"listingId":"90e7782f-3411-42dc-bb7b-0c1f4d53acb0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/48/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:35.815Z","lastSeenAt":"2026-04-24T20:02:27.786Z"}],"details":{"listingId":"90e7782f-3411-42dc-bb7b-0c1f4d53acb0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/48/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/48/transactions"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/48/transactions"},{"claim":"Docs, pricing, API, and README pages all rendered only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction history for a specific card resource via pay-per-call","Integrating card transaction data into agent workflows without API key management","Programmatic access to card-level financial data settled in USDC on Base"],"bestFor":["Agents that need keyless, pay-per-call access to card transaction data","Developers experimenting with x402 protocol integrations","Workflows requiring on-chain micropayment-gated API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integration","Bulk data retrieval where per-request pricing would be cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.843Z"},"updatedAt":"2026-04-24T20:02:27.786Z"}}