{"id":"f05e755d-3556-432e-a1ee-5da673ffe9a3","shortId":"VsgpZd","kind":"x402","title":"x402-gated card-transaction endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated card-transaction endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/31/transactions` behind the x402 payment protocol. When called without payment, it returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on the Base network, settled to a specified wallet address. The endpoint accepts HTTP POST requests and returns JSON.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments — payment is handled entirely via the x402 protocol using USDC on Base.\n\nHowever, the specific endpoint being listed here (`/api/v1/cards/31/transactions`) does not appear in the site's publicly documented API catalog. Its purpose — whether it relates to virtual card management, transaction history, or something else — is not documented in any crawled page. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. Without documentation or schema details for this particular endpoint, its exact functionality remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","http-post","json-response","pay-per-request","card-transactions"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","lowpaymentfee API","Base network API","card transaction history","virtual card API"],"warnings":["This specific endpoint (/api/v1/cards/31/transactions) does not appear in the site's public API catalog — its purpose is undocumented.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The endpoint path references a specific card ID (31), suggesting it may be a resource-specific route rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/31/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/31/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 on Base), but this specific path (/api/v1/cards/31/transactions) is not documented anywhere on the site. No request/response schema, no docs, no examples. The crawled docs/pricing/API pages all returned only 'Connect wallet' with no content. Functionality is entirely 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'0.02':65,131 '000':60 '20':59 '402':54 'Base network API' 'USDC pay-per-call' 'accept':79 'addit':211 'address':76 'advertis':90 'ai/ml':102 'analysi':105 'analyt':101 'api':98,136,173,200 'appear':166 'base':9,24,61,69,155 'base-network' 'behind':42 'broader':87 'call':13,28,48 'card':5,20,37,182 'card transaction history' 'card transactions API' 'card-transact':4,19 'card-transactions' 'catalog':174 'challeng':55 'classif':107 'commit':143 'connect':206 'content':212 'convers':124 'crawl':194 'data':100 'detail':217 'doc':197 'document':172,191,214 'els':188 'embed':108 'endpoint':7,22,32,78,127,159,221 'entir':147 'estim':118 'exact':223 'exchang':113 'expos':35 'feed':112 'financ':109 'function':224 'gas':117 'gate':3,18 'generat':125 'geocod':122 'handl':146 'histori':185 'howev':156 'http':80 'http-post' 'infer':103 'infrastructur':120 'json':85 'json-response' 'key':137 'limit':140 'list':129,161 'lowpaymentfee API' 'lowpaymentfee.com':34,88 'manag':183 'network':70 'page':195,201 'particular':220 'pay':11,26,95 'pay-per-cal':10,25 'pay-per-request':94 'payment':45,50,144 'per':12,27,96,132 'platform':89 'post':81 'price':111,198 'prompt':208 'protocol':46,151 'public':171 'purpos':176 'quot':116 'rate':114,139 'relat':179 'remain':225 'request':56,82,97,133 'resourc':39 'return':52,84,203 'schema':216 'sentiment':104 'settl':71 'site':169 'someth':187 'span':99 'specif':158 'specifi':74 'suit':92 'summar':106 'token':115 'transact':6,21,38,184 'unclear':226 'unit':62 'usd':66 'usdc':15,30,64,153 'usdc-settlement' 'use':152 'util':121 'valid':123 'via':148 'virtual':181 'virtual card API' 'wallet':75,207 'web3':110 'whether':177 'without':49,213 'x402':2,17,44,150 'x402 card endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"b2f472bb-d287-4949-9fd0-4bb1579f109d","listingId":"f05e755d-3556-432e-a1ee-5da673ffe9a3","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/31/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":"2026-04-18T18:43:26.816Z"}],"sources":[{"listingId":"f05e755d-3556-432e-a1ee-5da673ffe9a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/31/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:26.816Z","lastSeenAt":"2026-04-24T21:03:01.749Z"}],"details":{"listingId":"f05e755d-3556-432e-a1ee-5da673ffe9a3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/31/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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/31/transactions"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/31/transactions"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and no commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or creating card transaction records via a pay-per-call model","Integrating card transaction data into automated agent workflows without API keys","Making micropayment-gated API calls settled in USDC on Base"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, per-request API access to card transaction data","Developers exploring x402 protocol integrations"],"notFor":["Users needing well-documented API contracts with full schema definitions","High-volume batch processing where per-request micropayments add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.258Z"},"updatedAt":"2026-04-24T21:03:01.749Z"}}