{"id":"bf6bf146-a1b1-4f96-8ebd-99025caee5c8","shortId":"meCSuA","kind":"x402","title":"x402-gated card-transactions endpoint on Base, paying per request in USDC.","tagline":"x402-gated card-transactions endpoint on Base, paying per request in USDC.","description":"This endpoint at lowpaymentfee.com exposes a POST resource at `/api/v1/cards/3/transactions` behind an x402 payment challenge. The x402 challenge advertises a maximum cost of 20,000 base units of USDC on the Base network. Since USDC uses 6 decimals, this translates to $0.02 per request. The provider's landing page confirms a flat $0.02/request pricing model across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe specific endpoint path (`/api/v1/cards/3/transactions`) suggests it deals with card transaction data — likely retrieving or creating transactions associated with a particular card resource (card ID 3). However, there is no OpenAPI schema, no request/response documentation, and no examples available from the crawl. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. The provider's landing page lists many other endpoints across categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but this particular cards/transactions endpoint is not listed among them.\n\nThe endpoint is live and responds with a proper x402 v1 challenge. Payment is settled in USDC on the Base L2 network using the \"exact\" scheme. The payTo address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The timeout for payment is 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","post-endpoint","per-request-billing"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","Base network API","lowpaymentfee cards","payment-gated API","card transaction data"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content","No request body schema or response schema provided; callers cannot know what to send or expect back","The /api/v1/cards/3/transactions endpoint is not listed among the provider's advertised APIs on the landing page","The endpoint path references a hardcoded card ID (3), which may indicate a demo or placeholder resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/3/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/3/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and network details. However, there is no documentation, no request/response schema, no examples, and the specific endpoint is not even listed on the provider's own landing page. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':82 '0.02':70,81 '000':53 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':219 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':226 '20':52 '3':124 '300':232 '6':65 'Base network API' 'USDC pay-per-call' 'access':98 'across':85,167 'address':217 'advertis':47 'ai':172 'among':187 'analyt':171 'api':91,145 'asset':223 'associ':116 'avail':137 'base':9,23,54,60,208 'base-network' 'behind':39 'card':5,19,108,120,122 'card transaction data' 'card transactions API' 'card-transact':4,18 'card-transactions' 'cards/transactions':182 'categori':168 'challeng':43,46,200 'confirm':78 'connect':151 'content':157 'contract':224 'cost':50 'crawl':140 'creat':114 'data':110,170 'deal':106 'decim':66 'doc':142 'document':133 'endpoint':7,21,30,88,101,166,183,190 'exact':213 'exampl':136 'expos':33 'financ':175 'flat':80 'gate':3,17 'howev':125 'id':123 'infrastructur':178 'instant':97 'key':92 'l2':209 'land':76,161 'learn':174 'like':111,169 'limit':95 'list':163,186 'live':192 'lowpaymentfee cards' 'lowpaymentfee.com':32 'machin':173 'mani':164 'maximum':49 'model':84 'network':61,210 'openapi':129 'page':77,146,162 'particular':119,181 'path':102 'pay':10,24 'payment':42,201,230 'payment-gated API' 'payto':216 'per':11,25,71 'per-request-billing' 'post':35 'post-endpoint' 'price':83,143 'prompt':153 'proper':197 'provid':74,159 'rate':94 'request':12,26,72 'request/response':132 'resourc':36,121 'respond':194 'retriev':112 'return':148 'schema':130 'scheme':214 'second':233 'settl':203 'sinc':62 'specif':100 'suggest':104 'timeout':228 'transact':6,20,109,115 'translat':68 'unit':55 'usdc':14,28,57,63,205,222 'usdc-settlement' 'use':64,211 'v1':199 'wallet':152 'web3':176 'x402':2,16,41,45,198 'x402 card endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"afacc1b5-2037-4f97-a9ce-d700d1924837","listingId":"bf6bf146-a1b1-4f96-8ebd-99025caee5c8","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/3/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":"2026-04-18T18:43:29.169Z"}],"sources":[{"listingId":"bf6bf146-a1b1-4f96-8ebd-99025caee5c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/3/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:29.169Z","lastSeenAt":"2026-04-24T20:02:27.467Z"}],"details":{"listingId":"bf6bf146-a1b1-4f96-8ebd-99025caee5c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/3/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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/3/transactions"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/3/transactions"},{"claim":"Provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or creating card transaction records via a pay-per-call model","Integrating card transaction data into agent workflows without API key management","Programmatic access to card-level transaction information settled in USDC on Base"],"bestFor":["Agents needing card transaction data with zero signup friction","Developers who prefer crypto micropayments over traditional API key billing","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume use cases where per-request pricing at $0.02 may be cost-prohibitive compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.225Z"},"updatedAt":"2026-04-24T20:02:27.467Z"}}