{"id":"7ba9de88-b030-45e9-9f51-2e6ad5d68fbb","shortId":"zyF7fa","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 exposes a card-transactions resource at `/api/v1/cards/58/transactions` behind an x402 payment challenge. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint listed here (`/api/v1/cards/58/transactions`) is labeled \"Premium API Access\" in the x402 challenge but lacks detailed documentation about what data it returns or what POST body it expects. The x402 challenge confirms it is live, accepts USDC (contract `0x8335…2913` on Base), and requires a maximum payment of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is gated purely by the x402 micropayment.\n\nDocumentation across the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of the card-transactions resource beyond its URL path. Prospective callers should expect to experiment or contact the provider for integration details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","402 payment endpoint","card data endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; the POST body and response format are unknown.","The specific purpose of /api/v1/cards/58/transactions is unclear — 'Premium API Access' is a generic label.","The hardcoded card ID '58' in the path suggests this may be a demo or placeholder resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/58/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/58/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 there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the card-transactions resource actually returns. This is effectively a stub 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'0.02':11,26,78,143 '000':139 '0x8335':128 '20':138 '2913':129 '402 payment endpoint' '6':147 'Base network API' 'USDC pay-per-call' 'accept':125 'access':98,157 'across':166 'advertis':156 'ai/ml':68 'analyt':67 'api':63,97,150,174 'base':9,24,86,131,140 'base-network' 'behind':43 'beyond':207 'bodi':115 'broader':53 'call':62 'caller':212 'card':5,20,38,204 'card data endpoint' 'card transactions API' 'card-transact':4,19,37,203 'card-transactions' 'challeng':47,102,120 'confirm':121 'connect':183 'contact':218 'content':189 'contract':127 'data':66,71,109 'decim':148 'descript':200 'detail':105,223 'doc':173 'document':106,165 'dozen':57 'endpoint':7,22,32,64,90 'exampl':197 'expect':117,214 'experi':216 'expos':35 'extrem':170 'finance/web3':70 'gate':3,18,159 'given':144 'i.e':142 'infer':69 'infrastructur':73 'integr':222 'key':151 'label':95 'lack':104 'limit':154 'list':91 'live':124 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':135 'micropay':164 'network':87 'no-api-key' 'offer':56 'openapi':193 'page':178 'part':50 'path':210 'pay':10,25,60 'pay-per-cal':59 'pay-per-request' 'payment':46,136 'per':12,27,61,79 'platform':54 'post':114 'premium':96 'price':76,175 'prompt':185 'prospect':211 'provid':220 'pure':160 'rate':153 'readm':177 'render':180 'request':13,28,80 'request/response':196 'requir':133 'resourc':40,206 'return':111 'schema':194 'settl':81 'site':168 'span':65 'specif':89 'substant':188 'thin':171 'transact':6,21,39,205 'unit':141 'url':209 'usdc':15,30,83,126,145 'usdc-settlement' 'util':74 'wallet':184 'x402':2,17,45,101,119,163 'x402 micropayment API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"9079a936-b36b-45c5-9fa3-1d7b2ee2216c","listingId":"7ba9de88-b030-45e9-9f51-2e6ad5d68fbb","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/58/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":"2026-04-18T18:43:44.881Z"}],"sources":[{"listingId":"7ba9de88-b030-45e9-9f51-2e6ad5d68fbb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/58/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:44.881Z","lastSeenAt":"2026-04-24T17:32:42.381Z"}],"details":{"listingId":"7ba9de88-b030-45e9-9f51-2e6ad5d68fbb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/58/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units.","source_url":"https://lowpaymentfee.com/api/v1/cards/58/transactions"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/cards/58/transactions"}],"useCases":["Fetching card transaction records via a single micropayment","Integrating pay-per-call card data into agent workflows","Programmatic access to card-level transaction data without API key management"],"bestFor":["Agents or bots that can settle x402 USDC payments on Base","Developers wanting keyless, pay-per-use card transaction data","Prototyping micropayment-gated API integrations"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.413Z"},"updatedAt":"2026-04-24T17:32:42.381Z"}}