{"id":"7a48ed0f-2043-46c6-8b2d-b3c6fb9e41a1","shortId":"uUwXAn","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 provides access to a card transactions resource via the x402 payment protocol. The specific path `/api/v1/cards/21/transactions` suggests it returns or creates transaction records for a particular card (card ID 21). Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broader suite of x402-gated 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 endpoints are advertised at $0.02 per request with no API keys, no rate limits, and instant access. However, the specific endpoint listed here falls under a \"cards/transactions\" path that is not explicitly documented on the provider's landing page.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1, accepting the \"exact\" payment scheme. The POST method is required. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawled material — the docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","post-endpoint","pay-per-request"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","Base network API","lowpaymentfee","card transaction data","402 payment API"],"warnings":["The /api/v1/cards/21/transactions path is not listed among the provider's documented APIs — its purpose and expected input/output are unknown.","No OpenAPI spec, request schema, or response schema is available; integration requires guesswork.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.","The provider lists many diverse API categories (AI, finance, geocoding, etc.) all at the same price, which may indicate placeholder or demo endpoints rather than production services."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/21/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/21/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 OpenAPI schema, no request/response documentation, and no examples. The specific /cards/21/transactions path is not listed on the provider's landing page, and all documentation pages render only a wallet-connect prompt. The actual functionality behind this endpoint is 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'0.02':10,24,79,133 '000':83 '0x8335':73 '1':182 '20':82 '21':62 '2913':74 '402':179 '402 payment API' '6':87 'Base network API' 'USDC pay-per-call' 'accept':183 'access':34,145 'advertis':131 'ai/ml':104 'analysi':107 'analyt':103 'api':100,138,210 'base':8,22,68,84 'base-network' 'broader':94 'card':4,18,37,59,60 'card transaction data' 'card transactions API' 'card-transactions' 'cards/transactions':155 'challeng':177 'classif':109 'connect':219 'content':225 'contract':72 'convers':126 'cost':77 'crawl':206 'creat':53 'data':102 'decim':88 'detail':196 'doc':209 'document':161,198 'embed':110 'endpoint':6,20,30,129,149,169 'estim':120 'exact':185 'exampl':201 'exchang':115 'explicit':160 'fall':152 'feed':114 'financ':111 'found':203 'gas':119 'gate':3,17,99 'generat':127 'geocod':124 'host':92 'howev':146 'http':178 'id':61 'infer':105 'infrastructur':122 'instant':144 'key':139 'land':166 'limit':142 'list':150 'live':171 'lowpaymentfee' 'lowpaymentfee.com':32,91 'materi':207 'method':190 'network':69 'openapi':194 'page':167,214 'particular':58 'path':47,156 'pay':9,23 'pay-per-request' 'payment':43,63,186 'per':11,25,80,134 'post':189 'post-endpoint' 'price':113,211 'prompt':221 'protocol':44 'provid':33,90,164 'quot':118 'rate':116,141 'readm':213 'record':55 'render':216 'request':12,26,81,135 'request/response':197 'requir':192 'resourc':39 'return':51,173 'schema':195 'scheme':187 'sentiment':106 'settl':65 'span':101 'specif':46,148 'substant':224 'suggest':49 'suit':95 'summar':108 'token':117 'transact':5,19,38,54 'unit':85 'usag':200 'usdc':14,28,71 'usdc-settlement' 'use':70 'util':123 'valid':125,175 'version':181 'via':40 'wallet':220 'web3':112 'x402':2,16,42,98,176 'x402 card endpoint' 'x402-gated':1,15,97 'x402-payment'","prices":[{"id":"53a25535-b342-4aa8-b681-2c907824f161","listingId":"7a48ed0f-2043-46c6-8b2d-b3c6fb9e41a1","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/21/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":"2026-04-18T18:43:21.979Z"}],"sources":[{"listingId":"7a48ed0f-2043-46c6-8b2d-b3c6fb9e41a1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/21/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:21.979Z","lastSeenAt":"2026-04-24T21:31:50.599Z"}],"details":{"listingId":"7a48ed0f-2043-46c6-8b2d-b3c6fb9e41a1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/21/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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/cards/21/transactions"},{"claim":"The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/cards/21/transactions"}],"useCases":["Retrieving or creating transaction records for a specific card via programmatic API calls","Integrating card transaction data into agent workflows that support x402 micropayments","Accessing financial card data without API keys using on-chain USDC payments"],"bestFor":["Agents or applications that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-per-request access to card transaction data","Prototyping x402 payment flows with low per-call costs"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring free or subscription-based access without per-call crypto payments","Production systems needing guaranteed SLAs — no rate limit or uptime guarantees are documented"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.49Z"},"updatedAt":"2026-04-24T21:31:50.599Z"}}