{"id":"76ec0b37-fe80-4801-bc1d-63f86087f012","shortId":"h6eAGa","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/67/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 (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 required — payment is handled entirely via the x402 protocol using USDC on Base.\n\nHowever, the specific endpoint being listed here (`/api/v1/cards/67/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 the crawled material. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. Without documentation or schema details for this particular resource, 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 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","card transaction history"],"warnings":["The /api/v1/cards/67/transactions endpoint is not listed in the site's public API catalog — its purpose is undocumented.","All docs, pricing, and API pages returned only 'Connect wallet' with no substantive content.","No request body schema or response schema is available for this endpoint.","The resource path includes a hardcoded ID (67), suggesting it may be instance-specific rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/67/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/67/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 captured) and pricing is clear ($0.02 USDC on Base), but the specific /cards/67/transactions resource is undocumented. No request/response schema, no docs content beyond 'Connect wallet', and no examples are available. The endpoint's actual functionality is 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'0.02':65,130 '000':60 '20':59 '402':54 'Base network API' 'USDC micropayment API' 'accept':79 'address':76 'advertis':90 'ai/ml':102 'analysi':104 'analyt':101 'api':98,135,173,200 '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':106 'commit':142 'connect':206 'content':212 'convers':123 'crawl':194 'data':100 'detail':217 'doc':197 'document':172,191,214 'els':188 'embed':107 'endpoint':7,22,32,78,126,159 'entir':147 'estim':117 'exact':223 'exchang':112 'expos':35 'feed':111 'financ':108 'function':224 'gas':116 'gate':3,18 'generat':124 'geocod':121 'handl':146 'histori':185 'howev':156 'http':80 'http-post' 'infrastructur':119 'json':85 'json-response' 'key':136 'limit':139 'list':128,161 'lowpaymentfee' 'lowpaymentfee.com':34,88 'manag':183 'materi':195 'network':70 'page':201 'particular':220 'pay':11,26,95 'pay-per-cal':10,25 'pay-per-call API' 'pay-per-request':94 'payment':45,50,144 'per':12,27,96,131 'platform':89 'post':81 'price':110,198 'prompt':208 'protocol':46,151 'public':171 'purpos':176 'quot':115 'rate':113,138 'relat':179 'remain':225 'request':56,82,97,132 'requir':143 'resourc':39,221 'return':52,84,203 'schema':216 'sentiment':103 'settl':71 'site':169 'someth':187 'span':99 'specif':158 'specifi':74 'suit':92 'summar':105 'token':114 'transact':6,21,38,184 'unclear':226 'unit':62 'usd':66 'usdc':15,30,64,153 'usdc-settlement' 'use':152 'util':120 'valid':122 'via':148 'virtual':181 'wallet':75,207 'web3':109 'whether':177 'without':49,213 'x402':2,17,44,150 'x402 payment endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"b8d08c7c-c8e9-4ad9-a53b-95dfa9df70ea","listingId":"76ec0b37-fe80-4801-bc1d-63f86087f012","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/67/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":"2026-04-18T18:43:48.539Z"}],"sources":[{"listingId":"76ec0b37-fe80-4801-bc1d-63f86087f012","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/67/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:48.539Z","lastSeenAt":"2026-04-24T17:32:42.564Z"}],"details":{"listingId":"76ec0b37-fe80-4801-bc1d-63f86087f012","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/67/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 (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/67/transactions"},{"claim":"The site 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":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/67/transactions"},{"claim":"The site lists 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 agent workflows without API key management","Programmatic access to card-level transaction data settled in USDC on Base"],"bestFor":["Agents that need on-demand card transaction access without subscription commitments","Developers wanting crypto-native pay-per-request billing on Base","Workflows requiring no-signup, keyless API access"],"notFor":["Use cases requiring detailed API documentation or guaranteed SLAs","High-volume batch processing where per-request pricing is inefficient","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.26Z"},"updatedAt":"2026-04-24T17:32:42.564Z"}}