{"id":"b5d86a2a-1ce5-47fc-a341-903fe0f9a0b1","shortId":"tLGnFq","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/14/transactions` behind the x402 payment protocol. It accepts HTTP POST requests and requires an X-PAYMENT header carrying a USDC payment on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which at 6 decimals equals $0.02 per request.\n\nThe parent site lowpaymentfee.com hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto market data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific `/api/v1/cards/14/transactions` endpoint is not listed on the site's public catalog, and no documentation, request schema, or response schema is available for it. The endpoint's purpose — whether it returns transaction history for a card, creates a transaction, or something else — cannot be confirmed from the available material.\n\nThe endpoint is live: it returns a well-formed x402 version-1 challenge with a 402 status code. Settlement is via the \"exact\" scheme on Base mainnet to address 0x1A2B…85F3, with a 300-second timeout. No OpenAPI spec, no usage examples, and no detailed docs were found.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","http-post","card-transactions","pay-per-call"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","lowpaymentfee API","Base network API","card transaction history","payment-gated API"],"warnings":["No OpenAPI spec or request/response schema available for this endpoint","The /api/v1/cards/14/transactions path is not listed on the provider's public API catalog — its function is unclear","Documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' stub with no useful content","The endpoint's actual behavior (read vs. write, required body fields, response format) is entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/14/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/14/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 the specific endpoint is not listed on the provider's own catalog. The purpose and expected input/output of this particular resource are 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'/api/v1/cards/14/transactions':41,138 '0.02':87,122 '000':76 '0x1a2b':216 '0x8335':81 '20':75 '300':220 '402':202 '6':84 '85f3':217 'Base network API' 'USDC pay-per-call' 'accept':48 'address':215 'advertis':70 'ai/ml':107 'analyt':106 'api':103,127 'avail':158,184 'base':9,24,65,77,212 'base-network' 'behind':42 'broader':96 'call':13,28,102 'cannot':179 'card':5,20,37,172 'card transaction history' 'card transactions API' 'card-transact':4,19 'card-transactions' 'carri':59 'catalog':97,148 'challeng':69,199 'classif':111 'code':204 'commit':134 'confirm':181 'cost':73 'creat':173 'data':105,115 'decim':85 'detail':231 'doc':232 'document':151 'els':178 'embed':112 'endpoint':7,22,32,139,162,187 'equal':86 'exact':209 'exampl':228 'expos':35 'finance/crypto':113 'form':195 'found':234 'gate':3,18 'header':58 'histori':169 'host':94 'howev':135 'http':49 'http-post' 'infer':108 'key':128 'limit':131 'list':142 'live':189 'lowpaymentfee API' 'lowpaymentfee.com':34,93 'mainnet':213 'market':114 'materi':185 'maximum':72 'network':66 'openapi':224 'parent':91 'pay':11,26,100 'pay-per-cal':10,25,99 'pay-per-call' 'payment':45,57,62 'payment-gated API' 'per':12,27,88,101,123 'post':50 'price':120 'protocol':46 'public':147 'purpos':164 'rate':130 'request':51,89,124,152 'requir':53 'resourc':39 'respons':155 'return':167,191 'schema':153,156 'scheme':210 'second':221 'sentiment':109 'servic':118 'settlement':205 'site':92,145 'someth':177 'span':104 'spec':225 'specif':137 'status':203 'summar':110 'timeout':222 'transact':6,21,38,168,175 'unit':78 'usag':227 'usdc':15,30,61,80 'usdc-settlement' 'util':117 'version':197 'via':207 'well':194 'well-form':193 'whether':165 'x':56 'x-payment':55 'x402':2,17,44,68,196 'x402 card endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"3b41a351-fc30-4dca-b6cb-a374145aae00","listingId":"b5d86a2a-1ce5-47fc-a341-903fe0f9a0b1","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/14/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":"2026-04-18T18:43:17.149Z"}],"sources":[{"listingId":"b5d86a2a-1ce5-47fc-a341-903fe0f9a0b1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/14/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:17.149Z","lastSeenAt":"2026-04-24T21:31:50.357Z"}],"details":{"listingId":"b5d86a2a-1ce5-47fc-a341-903fe0f9a0b1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/14/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":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/cards/14/transactions"},{"claim":"The site lists APIs at $0.02/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/14/transactions"}],"useCases":["Retrieving or creating card transaction records via a pay-per-call model","Integrating card transaction data into agent workflows without API key management","Programmatic access to card-level transaction information settled in USDC on Base"],"bestFor":["Agents that can settle x402 USDC payments on Base","Use cases needing keyless, per-request API access to card transaction data","Developers exploring x402 protocol integrations"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.755Z"},"updatedAt":"2026-04-24T21:31:50.357Z"}}