{"id":"335fe842-d40e-4cb5-82a6-534635630824","shortId":"SUfVsD","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 provides access to a card transactions resource at `/api/v1/cards/42/transactions` via the x402 payment protocol. The endpoint is live and returns a standard 402 challenge requiring payment in USDC on the Base network. The specific resource path suggests it returns or creates transaction data for a particular card (card ID 42), though no detailed documentation or schema for the request/response body is available.\n\nThe endpoint charges a maximum of 0.02 USDC per request (20,000 base units with 6 decimals), consistent with the site-wide flat pricing of $0.02/request advertised on the provider's landing page. Payment is settled on-chain via the x402 \"exact\" scheme to a specified wallet address. The provider advertises no API keys, no rate limits, and instant access across all their endpoints.\n\nThe provider (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto data feeds, and utility services. However, this specific listing covers only the `/api/v1/cards/42/transactions` endpoint. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the exact request format and response schema remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-call","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","payment card data","transaction history","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No request or response schema available — the exact payload format is unknown","Documentation pages (/docs, /pricing, /README) are empty beyond a wallet-connect prompt","The endpoint path '/api/v1/cards/42/transactions' with a hardcoded card ID 42 is unusual and may be a demo or placeholder","The provider's broader API suite is unverified; only this single endpoint was probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/42/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/42/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the purpose of this specific cards/transactions resource is unclear. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'/docs':200 '/pricing':201 '/readme':202 '/request':122 '0.02':101,121 '000':106 '20':105 '402':55 '42':82 '6':110 'Base network API' 'USDC micropayment API' 'access':34,157 'across':158 'address':145 'advertis':123,148 'ai/ml':177 'analyt':176 'api':150,173 'avail':94 'base':8,22,63,107 'base-network' 'bodi':92 'broader':167 'call':12,26 'card':4,18,37,79,80 'card transactions API' 'card-transactions' 'chain':135 'challeng':56 'charg':97 'classif':181 'connect':206 'consist':112 'content':212 'cover':193 'creat':73 'data':75,175,184 'decim':111 'detail':85 'document':86,198 'embed':182 'endpoint':6,20,30,48,96,161,197 'exact':139,215 'feed':185 'finance/crypto':183 'flat':118 'format':217 'gate':3,17,172 'host':165 'howev':189 'id':81 'infer':178 'instant':156 'key':151 'land':128 'limit':154 'list':192 'live':50 'lowpaymentfee' 'lowpaymentfee.com':32,164 'maximum':99 'network':64 'no-api-key' 'on-chain':133 'page':129,199 'particular':78 'path':68 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'payment':45,58,130 'payment card data' 'per':11,25,103 'price':119 'prompt':208 'protocol':46 'provid':33,126,147,163 'rate':153 'remain':221 'request':104,216 'request/response':91 'requir':57 'resourc':39,67 'respons':219 'return':52,71,203 'schema':88,220 'scheme':140 'sentiment':179 'servic':188 'settl':132 'site':116 'site-wid':115 'span':174 'specif':66,191 'specifi':143 'standard':54 'substant':211 'suggest':69 'suit':168 'summar':180 'though':83 'transact':5,19,38,74 'transaction history' 'unit':108 'unknown':222 'usdc':14,28,60,102 'usdc-settlement' 'util':187 'via':42,136 'wallet':144,207 'wide':117 'x402':2,16,44,138,171 'x402 endpoint' 'x402-gated':1,15,170 'x402-payment'","prices":[{"id":"6726599a-5284-4336-b931-b5bb60c77cb8","listingId":"335fe842-d40e-4cb5-82a6-534635630824","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/42/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":"2026-04-18T18:43:34.005Z"}],"sources":[{"listingId":"335fe842-d40e-4cb5-82a6-534635630824","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/42/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:34.005Z","lastSeenAt":"2026-04-24T20:02:27.710Z"}],"details":{"listingId":"335fe842-d40e-4cb5-82a6-534635630824","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/42/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 402 with x402 challenge requiring USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/cards/42/transactions"},{"claim":"Site-wide pricing is $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/42/transactions"}],"useCases":["Retrieving or posting transaction data for a specific card via pay-per-call USDC micropayments","Integrating card transaction lookups into agent workflows without API key management","Programmatic access to card-level transaction records settled on Base L2"],"bestFor":["Agents needing on-demand card transaction data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Low-volume or sporadic access to card transaction endpoints"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.921Z"},"updatedAt":"2026-04-24T20:02:27.710Z"}}