{"id":"5a57b5fe-4fab-40a5-80c3-047108b235bc","shortId":"7YPSur","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card-transactions 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/77/transactions` behind an x402 payment challenge. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint listed here appears to be a card-transaction lookup or creation resource (HTTP POST). The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayments.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual functionality behind the paywall is not documented in any accessible way.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","card-transactions","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","payment fee API","USDC micropayment endpoint","x402 card data","lowpaymentfee","Base network API","per-call payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; actual endpoint behavior behind the paywall is unknown","The endpoint path references a specific card ID (77), which may be a demo or placeholder resource","Cannot verify what data or functionality is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/77/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/77/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind the paywall is entirely opaque — the description 'Premium API Access' is generic and the path '/api/v1/cards/77/transactions' is the only hint at 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'0.02':11,26,77,126 '000':115 '0x8335':120 '20':114 '2913':121 '300':142 '402':211 '6':130 'Base network API' 'USDC micropayment endpoint' 'access':153,229 'actual':219 'advertis':109,152 'ai/ml':67 'amount':112 'analyt':66 'api':63,146,172 'appear':93 'avail':199 'base':9,24,86,116,123 'base-network' 'behind':43,221 'broader':53 'call':62 'card':5,20,38,98 'card transactions API' 'card-transact':4,19,37,97 'card-transactions' 'challeng':47,108,216 'confirm':207 'connect':180 'content':186 'crawl':202 'creation':102 'data':65,70 'decim':131 'doc':170 'document':162,226 'dozen':57 'endpoint':7,22,32,90,205 'equal':125 'exact':138 'exampl':198 'expos':35 'extrem':167 'finance/web3':69 'function':220 'gate':3,18 'given':127 'grant':155 'http':104,210 'infer':68 'infrastructur':72 'key':147 'limit':150 'list':91 'live':208 'lookup':100 'lowpaymentfee' 'lowpaymentfee.com':34 'made':134 'materi':203 'max':111 'micropay':161 'network':87 'no-api-key' 'offer':56 'openapi':190 'page':175 'part':50 'pay':10,25,60 'pay-per-cal':59 'pay-per-request' 'payment':46,132 'payment fee API' 'paywal':223 'per':12,27,61,78,159 'per-call payment API' 'per-request':158 'platform':54 'post':105 'price':75,171 'prompt':182 'pure':156 'rate':149 'readm':174 'render':177 'request':13,28,79,160 'request/response':193 'resourc':40,103 'return':209 'schema':194 'scheme':139 'second':143 'settl':81 'site':165 'span':64 'spec':191 'specif':89 'substant':185 'thin':168 'timeout':144 'transact':6,21,39,99 'unit':117 'usag':197 'usdc':15,30,83,119,128 'usdc-micropayment' 'util':73 'valid':214 'via':135 'wallet':181 'way':230 'x402':2,17,45,107,137,215 'x402 card data' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"b5475419-64e2-4744-9962-2af7ede07e8a","listingId":"5a57b5fe-4fab-40a5-80c3-047108b235bc","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/77/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":"2026-04-18T18:43:52.122Z"}],"sources":[{"listingId":"5a57b5fe-4fab-40a5-80c3-047108b235bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/77/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:52.122Z","lastSeenAt":"2026-04-24T17:02:22.755Z"}],"details":{"listingId":"5a57b5fe-4fab-40a5-80c3-047108b235bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/77/transactions\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/77/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/77/transactions"}],"useCases":["Retrieving or creating card transaction records via a single micropayment","Programmatic access to card transaction data without API key management","Agent-driven financial data retrieval with on-chain USDC settlement"],"bestFor":["Developers wanting keyless, pay-per-call access to card transaction data","AI agents that can settle x402 payments on Base","Users who prefer micropayment models over subscription billing"],"notFor":["Anyone needing detailed API documentation or response schemas before purchasing","High-volume batch processing where per-request fees add up","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.02Z"},"updatedAt":"2026-04-24T17:02:22.755Z"}}