{"id":"332958ab-b20a-4e95-9216-6ba480d6f66f","shortId":"KyMzKT","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/65/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 gated via the x402 protocol on the Base network, settled in USDC.\n\nThe specific endpoint listed here (`/api/v1/cards/65/transactions`) accepts POST requests and is labeled \"Premium API Access\" in the x402 challenge. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the x402 `exact` scheme to the specified payTo address on Base. No API keys or rate limits are advertised; access is granted purely through per-request micropayments.\n\nDocumentation on the site is extremely thin — the 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/65/transactions` resource actually returns. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but without documentation it is unclear what data or functionality is provided beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","post-endpoint","card-transactions","pay-per-request"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 micropayment API","lowpaymentfee","USDC pay-per-call","Base network API","402 payment required API"],"warnings":["No documentation available — all doc/API/pricing/README pages show only 'Connect wallet'","No OpenAPI or request/response schema provided","The purpose of /api/v1/cards/65/transactions is unclear — 'Premium API Access' is a generic label","Cannot verify what data the endpoint returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/65/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/65/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The listing is effectively a 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'/cards/65/transactions':195 '0.02':11,26,123 '000':114 '20':113 '402':206 '402 payment required API' '6':119 'Base network API' 'USDC pay-per-call' 'accept':93 'access':101,147,229 'actual':197 'address':136 'advertis':146 'ai/ml':67 'amount':108 'analyt':66 'api':63,100,140,165,228 'base':9,24,82,115,138 'base-network' 'behind':43 'beyond':224 'broader':53 'call':62,111 'card':5,20,38 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'challeng':47,105,211 'confirm':202 'connect':174 'content':180 'data':65,70,219 'decim':120 'descript':191 'doc':164 'document':156,214 'dozen':57 'endpoint':7,22,32,89,200 'equal':122 'exact':130 'exampl':188 'expos':35 'extrem':161 'finance/web3':69 'function':221 'gate':3,18,75 'generic':226 'grant':149 'http':205 'infer':68 'infrastructur':72 'key':141 'label':98,230 'limit':144 'list':90 'live':203 'lowpaymentfee' 'lowpaymentfee.com':34 'made':126 'maximum':107 'micropay':155 'network':83 'offer':56 'openapi':184 'page':169 'part':50 'pay':10,25,60 'pay-per-cal':59 'pay-per-request' 'payment':46,124 'payto':135 'per':12,27,61,110,153 'per-request':152 'platform':54 'post':94 'post-endpoint' 'premium':99,227 'price':166 'prompt':176 'protocol':79 'provid':223 'pure':150 'rate':143 'readm':168 'render':171 'request':13,28,95,154 'request/response':187 'requir':109 'resourc':40,196 'return':198,204 'schema':185 'scheme':131 'settl':84 'site':159 'span':64 'specif':88 'specifi':134 'thin':162 'transact':6,21,39 'unclear':217 'unit':116 'usdc':15,30,86,118 'usdc-micropayment' 'util':73 'valid':209 'via':76,127 'wallet':175 'without':213 'x402':2,17,45,78,104,129,210 'x402 micropayment API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"f4d002e7-2ece-4199-b64c-95ec7cba043f","listingId":"332958ab-b20a-4e95-9216-6ba480d6f66f","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/65/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":"2026-04-18T18:43:41.249Z"}],"sources":[{"listingId":"332958ab-b20a-4e95-9216-6ba480d6f66f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/65/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:41.249Z","lastSeenAt":"2026-04-24T18:32:22.780Z"}],"details":{"listingId":"332958ab-b20a-4e95-9216-6ba480d6f66f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/65/transactions\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to proceed.","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/65/transactions"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/65/transactions"}],"useCases":["Retrieving card transaction data via a single micropayment per request","Programmatic access to card-level transaction records without API key management","Agent-driven financial data retrieval settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-call access to card transaction data","AI agents that can settle x402 micropayments on Base","Users who prefer no-commitment, no-subscription API access"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.615Z"},"updatedAt":"2026-04-24T18:32:22.780Z"}}