{"id":"73d06595-8554-461b-81d1-50a0e5c3a3f6","shortId":"42u7uY","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/49/transactions` behind an x402 payment challenge. It accepts HTTP POST requests and settles payments in USDC on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform lists numerous pay-per-call APIs across categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints are advertised at $0.02 per request with the same x402 payment model on Base.\n\nHowever, the specific endpoint being listed here — `/api/v1/cards/49/transactions` — is labeled only as \"Premium API Access\" with no further documentation about its request schema, expected input fields, or response format. The docs, pricing, and API pages on the site returned only a \"Connect wallet\" prompt with no additional content. Without documentation or example payloads, the exact functionality of this card-transactions endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","http-post","pay-per-call","card-transactions"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 payment endpoint","USDC micropayment API","lowpaymentfee","pay-per-request API","Base network API","card data endpoint"],"warnings":["No API documentation available — docs, pricing, and API pages all return only 'Connect wallet' with no content","No request or response schema provided; the purpose of '/api/v1/cards/49/transactions' is unclear","The endpoint path references a specific card ID (49), which may indicate a demo or placeholder resource","No OpenAPI spec, no examples, and no description beyond the generic 'Premium API Access' label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/49/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/49/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/request in USDC on Base), but there is no documentation, no request/response schema, and no explanation of what 'cards/49/transactions' actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':79,147 '000':70 '20':69 '6':75 'Base network API' 'USDC micropayment API' 'accept':48 'access':172 'across':115 'addit':204 'advertis':64,145 'ai/ml':120 'analysi':123 'analyt':119 'api':83,114,171,191 'attach':92 'base':9,24,59,71,157 'base-network' 'behind':42 'broader':105 'call':13,28,113 'caller':90 'card':5,20,37,217 'card data endpoint' 'card transactions API' 'card-transact':4,19,216 'card-transactions' 'categori':116 'challeng':46,63 'classif':125 'connect':199 'content':205 'convers':141 'cost':67 'crypto':129 'data':118 'decim':76 'doc':188 'document':176,207 'embed':126 'endpoint':7,22,32,143,161,219 'equal':78 'estim':135 'exact':212 'exampl':209 'exchang':132 'expect':181 'expos':35 'feed':131 'field':183 'financ':127 'format':186 'function':213 'gas':134 'gate':3,18 'geocod':139 'header':97 'howev':158 'http':49 'http-post' 'includ':117 'infer':121 'infrastructur':137 'input':182 'key':84 'label':167 'limit':87 'list':108,163 'lowpaymentfee' 'lowpaymentfee.com':34,106 'maximum':66 'model':155 'network':60 'numer':109 'page':192 'pay':11,26,111 'pay-per-cal':10,25,110 'pay-per-call' 'pay-per-request API' 'payload':210 'payment':45,54,96,102,154 'per':12,27,80,112,148 'platform':107 'post':50 'premium':170 'price':130,189 'prompt':201 'proof':103 'rate':86,133 'remain':220 'request':51,81,149,179 'requir':89 'resourc':39 'respons':185 'return':196 'schema':180 'sentiment':122 'settl':53 'simpli':91 'site':195 'specif':160 'summar':124 'transact':6,21,38,218 'unclear':221 'unit':72 'usdc':15,30,56,74 'usdc-settlement' 'util':138 'valid':100,140 'wallet':200 'without':206 'x':95 'x-payment':94 'x402':2,17,44,62,101,153 'x402 payment endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"a842a08a-b2ae-47ce-9653-8308287f33fe","listingId":"73d06595-8554-461b-81d1-50a0e5c3a3f6","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/49/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":"2026-04-18T18:43:35.833Z"}],"sources":[{"listingId":"73d06595-8554-461b-81d1-50a0e5c3a3f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/49/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:35.833Z","lastSeenAt":"2026-04-24T18:32:22.594Z"}],"details":{"listingId":"73d06595-8554-461b-81d1-50a0e5c3a3f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/49/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/49/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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages returned only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction data for a specific card via a pay-per-call model","Programmatic access to card transaction records without API key management","Agent-driven financial data retrieval settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-call access to card transaction data","AI agents that can settle x402 payments in USDC on Base","Use cases requiring no subscription or rate-limit constraints"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","High-volume batch processing where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.745Z"},"updatedAt":"2026-04-24T18:32:22.594Z"}}