{"id":"b37c9f57-a561-4149-9c42-7cc460886636","shortId":"ZmbPdg","kind":"x402","title":"x402-gated card transaction endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card transaction endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a card transactions resource at `/api/v1/cards/40/transactions` via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request.\n\nThe provider's site advertises a broad catalog of x402-gated 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 at $0.02 per request. However, this specific listing is for the `/api/v1/cards/40/transactions` endpoint, which is labeled \"Premium API Access\" and appears to be a card transactions resource. No detailed documentation, request/response schemas, or example payloads are available from the crawled pages (docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content).\n\nPayment is settled on the Base L2 network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests, requires no API keys, and advertises no rate limits. The x402 challenge specifies a 300-second payment timeout.","tags":[],"capabilities":["x402-payment","usdc-base","card-transactions","post-api","no-api-key","pay-per-request"],"categories":["finance","payments"],"synonyms":["card transactions API","payment card data","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","card 40 transactions"],"warnings":["No API documentation available — docs, pricing, and API pages all render only a 'Connect wallet' prompt with no further content.","No request or response schema is published; the exact purpose and expected input/output of /api/v1/cards/40/transactions is unknown.","The endpoint path suggests card-specific transaction data but no details confirm what 'card 40' refers to.","The provider site lists many diverse API categories but none specifically mention a 'cards' endpoint, raising questions about this resource's purpose."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/40/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/40/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and no examples available. The purpose of the 'cards/40/transactions' resource is unclear beyond the generic 'Premium API Access' label. Most crawled pages returned only 'Connect wallet' with no usable 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'0.02':10,24,81,127 '000':72 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':194 '20':71 '300':214 '402':54 '6':77 'Base network API' 'USDC micropayment API' 'accept':197 'access':34,144 'advertis':89,205 'ai/ml':101 'amount':66 'analysi':104 'analyt':100 'api':97,143,170,202 'appear':146 'avail':162 'base':8,22,62,73,188 'broad':91 'call':69 'card':4,18,37,150 'card 40 transactions' 'card transactions API' 'card-transactions' 'catalog':92 'challeng':55,211 'classif':106 'connect':176 'content':182 'contract':193 'convers':123 'crawl':165 'data':99 'decim':78 'detail':154 'doc':167 'document':155 'embed':107 'endpoint':6,20,30,48,138,196 'equal':80 'estim':117 'exampl':159 'exchang':112 'feed':111 'financ':108 'gas':116 'gate':3,17,96 'generat':124 'geocod':121 'howev':130 'infer':102 'infrastructur':119 'key':203 'l2':189 'label':141 'limit':208 'list':133 'live':50 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':65 'network':63,190 'no-api-key' 'page':166,171 'pay':9,23 'pay-per-request' 'payload':160 'payment':45,57,183,216 'payment card data' 'per':11,25,68,83,128 'post':198 'post-api' 'premium':142 'price':110,168 'prompt':178 'protocol':46 'provid':33,86 'quot':115 'rate':113,207 'request':12,26,84,129,199 'request/response':156 'requir':56,67,200 'resourc':39,152 'return':52,173 'schema':157 'second':215 'sentiment':103 'settl':185 'site':88 'span':98 'specif':132 'specifi':212 'summar':105 'timeout':217 'token':114 'transact':5,19,38,151 'unit':74 'usd':82 'usdc':14,28,59,76,192 'usdc-base' 'use':191 'util':120 'valid':122 'via':42 'wallet':177 'web3':109 'x402':2,16,44,95,210 'x402 endpoint' 'x402-gated':1,15,94 'x402-payment'","prices":[{"id":"e49a3c2f-22af-45fe-9606-6601b23a7831","listingId":"b37c9f57-a561-4149-9c42-7cc460886636","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/40/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":"2026-04-18T18:43:34.607Z"}],"sources":[{"listingId":"b37c9f57-a561-4149-9c42-7cc460886636","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/40/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:34.607Z","lastSeenAt":"2026-04-24T20:02:27.687Z"}],"details":{"listingId":"b37c9f57-a561-4149-9c42-7cc460886636","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/40/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":"Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/40/transactions"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/40/transactions"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages return only 'Connect wallet' with no further documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or submitting card transaction data via a pay-per-call model","Integrating card transaction lookups into agent workflows without API key management","Programmatic access to card transaction records settled with USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-request card transaction access","AI agents that can settle x402 payments in USDC on Base","Prototyping integrations that need card transaction data without subscription commitments"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume production workloads where per-request pricing may not be cost-effective","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.936Z"},"updatedAt":"2026-04-24T20:02:27.687Z"}}