{"id":"10630055-92b4-4e41-804c-ed8dd3e4ed00","shortId":"QQZhTc","kind":"x402","title":"x402-gated card-transaction endpoint on Base, paid per-call in USDC.","tagline":"x402-gated card-transaction endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com exposes a card-transactions resource at `/api/v1/cards/56/transactions` behind an x402 paywall. It accepts POST requests and settles payments in USDC on the Base network using the x402 \"exact\" scheme. The per-request cost is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of pay-per-call 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 the same $0.02/request price point. However, the specific endpoint listed here is scoped to card transactions (card ID 56), and no documentation was found describing its request body schema, expected fields, or response format.\n\nBecause the crawled docs pages, pricing page, and README all returned only a \"Connect wallet\" stub with no substantive content, the actual behavior of this endpoint remains unclear. There is no OpenAPI spec, no example requests or responses, and no detailed documentation available. The endpoint is confirmed live (returns a proper 402 challenge), but prospective callers will need to experiment or contact the provider to understand the required POST body and response structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-call","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","lowpaymentfee API","Base network API","card transaction lookup"],"warnings":["No documentation found — docs, pricing, README, and API pages all return only a 'Connect wallet' stub","No request body schema or response schema available for this endpoint","The endpoint is specific to card ID 56; it is unclear what this card represents or whether other card IDs are available","The broader platform advertises many API categories but none appear documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/56/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/56/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation beyond marketing stubs, no request/response schema, and no explanation of what 'cards/56/transactions' actually returns. This is effectively a stub 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'/request':150 '0.02':81,149 '000':72 '20':71 '402':233 '56':166 '6':77 'Base network API' 'USDC pay-per-call' 'accept':48 'account':88 'actual':203 'advertis':109 'ai/ml':122 'analysi':125 'analyt':121 'api':85,118 'attach':93 'avail':224 'base':9,24,58,73 'base-network' 'behavior':204 'behind':43 'bodi':175,251 'broader':106 'call':13,28,83,117 'caller':91,237 'card':5,20,38,162,164 'card transaction lookup' 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'catalog':112 'challeng':234 'classif':127 'confirm':228 'connect':195 'contact':243 'content':201 'convers':143 'cost':69 'crawl':184 'data':120 'decim':78 'describ':172 'detail':222 'doc':185 'document':169,223 'embed':128 'endpoint':7,22,32,156,207,226 'equal':80 'estim':137 'exact':63 'exampl':216 'exchang':132 'expect':177 'experi':241 'expos':35 'feed':131 'field':178 'finance/web3':129 'format':181 'found':171 'gas':136 'gate':3,18 'generat':144 'geocod':141 'header':98 'howev':153 'id':165 'infer':123 'infrastructur':139 'key':86 'list':157 'live':229 'lowpaymentfee API' 'lowpaymentfee.com':34,107 'need':239 'network':59 'no-api-key' 'openapi':213 'page':186,188 'paid':10,25 'pay':115 'pay-per-cal':114 'pay-per-call' 'payment':53,97,103 'paywal':46 'per':12,27,67,82,116 'per-cal':11,26 'per-request':66 'platform':108 'point':152 'post':49,250 'price':130,151,187 'proof':104 'proper':232 'prospect':236 'provid':245 'quot':135 'rate':133 'readm':190 'remain':208 'request':50,68,174,217 'requir':90,249 'resourc':40 'respons':180,219,253 'return':192,230 'schema':176 'scheme':64 'scope':160 'sentiment':124 'settl':52 'simpli':92 'span':119 'spec':214 'specif':155 'structur':254 'stub':197 'substant':200 'summar':126 'token':134 'transact':6,21,39,163 'unclear':209 'understand':247 'unit':74 'usdc':15,30,55,76 'usdc-settlement' 'use':60 'util':140 'valid':101,142 'wallet':196 'wide':111 'x':96 'x-payment':95 'x402':2,17,45,62,102 'x402 card endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"af427090-cf73-48d1-bd1b-5932c65aa918","listingId":"10630055-92b4-4e41-804c-ed8dd3e4ed00","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/56/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":"2026-04-18T18:43:47.930Z"}],"sources":[{"listingId":"10630055-92b4-4e41-804c-ed8dd3e4ed00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/56/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:47.930Z","lastSeenAt":"2026-04-24T17:32:42.564Z"}],"details":{"listingId":"10630055-92b4-4e41-804c-ed8dd3e4ed00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/56/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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, exact scheme, on Base network, with maxAmountRequired of 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/cards/56/transactions"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/56/transactions"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction history for a specific card via a pay-per-call model","Integrating card transaction data into agent workflows without API key management","Programmatic access to card-level transaction records settled in USDC on Base"],"bestFor":["Agents that need keyless, pay-per-request access to card transaction data","Developers experimenting with x402 payment protocol integrations","Workflows requiring on-chain USDC micropayments for API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where per-call pricing may add up","Anyone needing card transactions for cards other than ID 56 (endpoint is card-specific)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.26Z"},"updatedAt":"2026-04-24T17:32:42.564Z"}}