{"id":"f95a4ed9-b7bf-4655-a242-49d1a789dbe0","shortId":"aELgS7","kind":"x402","title":"x402-payable card transactions endpoint on Base, settling in USDC at $0.02/request.","tagline":"x402-payable card transactions endpoint on Base, settling in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a POST-based card transactions API accessible via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-request endpoints 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 `/api/v1/cards/11/transactions` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The actual functionality behind the \"cards/11/transactions\" path is unclear — it could relate to financial card transaction data, but this is not confirmed anywhere in the crawled material. Prospective users should test the endpoint directly to understand its input requirements and output format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint","card-transactions"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","USDC pay-per-call","lowpaymentfee","Base network API","micropayment API","402 payment endpoint"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request body format and response structure are unknown.","The purpose of '/api/v1/cards/11/transactions' is not explained anywhere in the crawled material.","The platform lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/11/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/11/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual purpose of the 'cards/11/transactions' path is undocumented. This is effectively a stub 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'/api/v1/cards/11/transactions':89 '/docs':165 '/pricing':167 '/readme':169 '/request':14,28 '0.02':13,27,75,119 '000':106 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':105 '402 payment endpoint' '6':115 'Base network API' 'USDC pay-per-call' 'access':41,94 'actual':196 'advertis':101 'ai/ml':65 'analyt':64 'anywher':217 'api':40,93,132 'asset':111 'attach':140 'avail':159 'base':8,22,37,84,107 'base-network' 'behind':198 'broader':52 'call':121 'caller':138 'card':4,18,38,209 'card transactions API' 'card-transactions' 'cards/11/transactions':200 'challeng':98,100 'confirm':216 'connect':175 'content':181 'could':205 'crawl':220 'data':63,68,211 'decim':116 'direct':228 'document':151,190 'dozen':55 'endpoint':6,20,30,61,88,160,227 'equat':117 'exact':128 'exampl':194 'extrem':153 'finance/web3':67 'financi':208 'format':236 'function':197 'header':145 'infer':66 'infrastructur':70 'input':232 'key':133 'label':91 'land':156 'limit':136 'list':158 'lowpaymentfee' 'lowpaymentfee.com':32 'made':124 'materi':221 'maxamountrequir':103 'micropayment API' 'network':85 'offer':54 'openapi':185 'output':235 'page':157,170 'part':49 'path':201 'pay':58 'pay-per-request':57 'payabl':3,17 'payment':45,122,144,149 'per':59,76,120 'platform':53 'post':36 'post-bas':35 'post-endpoint' 'premium':92 'price':73,162 'prompt':177 'proof':150 'prospect':222 'protocol':46 'provid':33 'rate':135 'relat':206 'render':172 'request':60,77 'request/response':188 'requir':137,233 'schema':189 'scheme':129 'settl':9,23,79 'simpli':139 'span':62 'spars':154 'spec':186 'specif':87 'test':225 'transact':5,19,39,210 'unclear':203 'understand':230 'unit':108 'usag':193 'usdc':11,25,81,110 'usdc-settlement' 'use':114 'user':223 'util':71 'valid':148 'via':42,125 'wallet':176 'x':143 'x-payment':142 'x402':2,16,44,97,127 'x402 API' 'x402-payable':1,15 'x402-payment'","prices":[{"id":"08b099a9-5a87-40ec-8506-1a753a791ef1","listingId":"f95a4ed9-b7bf-4655-a242-49d1a789dbe0","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/11/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":"2026-04-18T18:43:20.755Z"}],"sources":[{"listingId":"f95a4ed9-b7bf-4655-a242-49d1a789dbe0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/11/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:20.755Z","lastSeenAt":"2026-04-24T21:31:50.526Z"}],"details":{"listingId":"f95a4ed9-b7bf-4655-a242-49d1a789dbe0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/11/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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/11/transactions"},{"claim":"All endpoints 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","source_url":"https://lowpaymentfee.com/api/v1/cards/11/transactions"}],"useCases":["Retrieving card transaction data via a single paid API call","Integrating pay-per-request financial data into agent workflows","Testing x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand card transaction lookups without API key management","Low-volume, pay-as-you-go API consumption"],"notFor":["Users who need detailed API documentation before integrating","High-volume batch processing where per-request pricing adds up","Anyone requiring guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.603Z"},"updatedAt":"2026-04-24T21:31:50.526Z"}}