{"id":"56be2b81-64da-4900-b8a7-dfc321934a51","shortId":"B6QwtK","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 API at `/api/v1/cards/86/transactions` behind an x402 payment challenge. The site describes itself as offering \"Premium API Access\" and charges $0.02 per request, settled in USDC on the Base network. The x402 challenge confirms the asset is USD Coin (contract 0x8335…2913 on Base) with a maxAmountRequired of 20000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nThe specific functionality of this particular endpoint (`/api/v1/cards/86/transactions`) is unclear from the available documentation. The provider's landing page lists many API categories — data & analytics, AI & ML, finance & Web3, and infrastructure utilities — but this specific cards/transactions path does not appear in any of those listed categories. No OpenAPI schema, request/response examples, or detailed documentation were found; the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content.\n\nBecause the endpoint's actual behavior is undocumented, consumers should treat this as a stub listing. The x402 challenge is live and well-formed, confirming the endpoint is operational at the protocol level, but what data or action it returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","post-endpoint","pay-per-request"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API"],"warnings":["The endpoint path /api/v1/cards/86/transactions does not appear in the provider's listed API catalog — its purpose is undocumented.","No OpenAPI schema, request body format, or response examples are available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.","The description 'Premium API Access' is generic and does not explain what this endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/86/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/86/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/request. However, the specific endpoint path (/api/v1/cards/86/transactions) is not documented anywhere on the site, there is no OpenAPI schema, no request/response examples, and all doc pages are empty. The actual functionality is 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'0.02':11,26,59,92 '0x8335':79 '20000':87 '2913':80 '6':95 'Base network API' 'USDC micropayment API' 'access':56,105 'action':225 'actual':191 'advertis':104 'ai':139 'analyt':138 'api':40,55,98,135,174 'appear':153 'asset':74 'avail':126 'base':9,24,39,67,82,88 'base-network' 'behavior':192 'behind':43 'card':5,20 'card transactions API' 'card-transact':4,19 'cards/transactions':149 'categori':136,159 'challeng':47,71,205 'charg':58 'coin':77 'confirm':72,212 'connect':180 'consum':195 'content':186 'contract':78 'data':137,223 'decim':96 'describ':50 'detail':166 'doc':171 'document':127,167 'endpoint':7,22,32,120,189,214 'equal':91 'exampl':164 'expos':35 'financ':141 'form':211 'found':169 'function':116 'gate':3,18 'grant':107 'header':113 'infrastructur':144 'key':99 'land':131 'level':220 'limit':102 'list':133,158,202 'live':207 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':134 'maxamountrequir':85 'ml':140 'network':68 'offer':53 'openapi':161 'oper':216 'page':132,175 'particular':119 'path':150 'pay':10,25 'pay-per-call API' 'pay-per-request' 'payment':46,112,230 'per':12,27,60 'post':38 'post-bas':37 'post-endpoint' 'premium':54 'price':172 'prompt':182 'protocol':219 'provid':129 'pure':108 'rate':101 'request':13,28,61 'request/response':163 'return':177,227 'schema':162 'settl':62 'site':49 'specif':115,148 'stub':201 'success':229 'transact':6,21 'treat':197 'unclear':123 'undocu':194 'unit':89 'unknown':232 'upon':228 'usd':76 'usdc':15,30,64,93 'usdc-settlement' 'use':94 'util':145 'via':109 'wallet':181 'web3':142 'well':210 'well-form':209 'x402':2,17,45,70,111,204 'x402 API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"447ca557-b3df-483e-ab40-a940ef381c5e","listingId":"56be2b81-64da-4900-b8a7-dfc321934a51","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/86/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":"2026-04-18T18:43:55.788Z"}],"sources":[{"listingId":"56be2b81-64da-4900-b8a7-dfc321934a51","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/86/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:55.788Z","lastSeenAt":"2026-04-24T16:02:33.700Z"}],"details":{"listingId":"56be2b81-64da-4900-b8a7-dfc321934a51","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/86/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 returns maxAmountRequired of 20000 in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/86/transactions"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The listed API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure — but cards/transactions is not among them","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching card transaction data behind a per-request USDC micropayment","Integrating x402-compatible payment flows into agent workflows","Programmatic access to card-level transaction records"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can settle USDC micropayments per call","Use cases needing keyless, pay-per-request API access"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who need subscription or bulk pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.895Z"},"updatedAt":"2026-04-24T16:02:33.700Z"}}