{"id":"9958c995-6003-4902-b3e3-5d79951f56ff","shortId":"HButS9","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/61/transactions` behind an x402 payment challenge. It accepts HTTP POST requests and is settled on the Base network using USDC (contract 0x8335…2913). The per-request cost is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe hosting provider, lowpaymentfee.com, advertises a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request. However, this specific endpoint (`/api/v1/cards/61/transactions`) is labeled generically as \"Premium API Access\" and its exact functionality is not documented beyond the path structure, which suggests it relates to retrieving or creating transactions for a specific card (ID 61). No OpenAPI schema, request body examples, or response examples were found in the crawl.\n\nBecause the docs, pricing, and README pages all returned only a \"Connect wallet\" stub with no substantive content, the actual request/response contract for this endpoint remains unknown. Callers should treat this as an exploratory integration until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","card-transactions","http-post"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","lowpaymentfee API","Base network API","card 61 transactions"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a 'Connect wallet' stub","No request body schema or response schema documented for this endpoint","The endpoint path references a specific card ID (61), which may not be generalizable","The provider lists many API categories but none appear to have substantive documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/61/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/61/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 captured) and pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI schema, no documented request/response format, and all doc pages returned only a wallet-connect stub. The specific purpose of this card-transactions endpoint is 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'0.02':78,132 '000':71 '0x8335':62 '20':70 '2913':63 '6':81 '61':172 'Base network API' 'USDC pay-per-call' 'accept':48 'access':146 'actual':206 'advertis':109 'ai/ml':122 'analyt':121 'api':84,118,145 'attach':93 'base':9,24,57,72 'base-network' 'behind':42 'beyond':154 'bodi':177 'broad':111 'call':13,28,117 'caller':91,214 'card':5,20,37,170 'card 61 transactions' 'card transactions API' 'card-transact':4,19 'card-transactions' 'catalog':112 'challeng':46 'connect':198 'content':204 'contract':61,208 'cost':68 'crawl':186 'creat':165 'data':120,125 'decim':82 'doc':189 'document':153,224 'endpoint':7,22,32,138,211 'equal':77 'exact':149 'exampl':178,181 'exploratori':220 'expos':35 'finance/web3':124 'found':183 'function':150 'gate':3,18 'generic':142 'header':98 'host':106 'howev':135 'http':49 'http-post' 'id':171 'infer':123 'infrastructur':127 'integr':221 'key':85 'label':141 'limit':88 'lowpaymentfee API' 'lowpaymentfee.com':34,108 'network':58 'openapi':174 'page':193 'path':156 'pay':11,26,115 'pay-per-cal':10,25,114 'pay-per-request' 'payment':45,97,103 'per':12,27,66,116,133 'per-request':65 'post':50 'premium':144 'price':130,190 'proof':104 'provid':107 'rate':87 'readm':192 'relat':161 'remain':212 'request':51,67,134,176 'request/response':207 'requir':90 'resourc':39 'respons':180 'retriev':163 'return':195 'schema':175 'settl':54 'simpli':92 'span':119 'specif':137,169 'structur':157 'stub':200 'substant':203 'suggest':159 'surfac':225 'transact':6,21,38,166 'treat':216 'unit':73 'unknown':213 'usdc':15,30,60,75,79 'usdc-settlement' 'use':59,80 'util':128 'valid':101 'wallet':199 'x':96 'x-payment':95 'x402':2,17,44,102 'x402 card endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"dfb01ebf-cb43-4349-b1b2-9591ef84947c","listingId":"9958c995-6003-4902-b3e3-5d79951f56ff","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/61/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":"2026-04-18T18:43:45.480Z"}],"sources":[{"listingId":"9958c995-6003-4902-b3e3-5d79951f56ff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/61/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:45.480Z","lastSeenAt":"2026-04-24T17:32:42.381Z"}],"details":{"listingId":"9958c995-6003-4902-b3e3-5d79951f56ff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/61/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 challenge with x402Version 1, accepting USDC on Base network at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/cards/61/transactions"},{"claim":"All APIs 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 contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/61/transactions"}],"useCases":["Retrieving or posting transactions for a specific card resource via pay-per-call x402","Integrating card transaction data into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base with USDC"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, pay-per-call access to card transaction data","Low-volume, on-demand card transaction queries"],"notFor":["Production workloads requiring documented request/response schemas","High-volume batch processing where per-call pricing is inefficient","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.383Z"},"updatedAt":"2026-04-24T17:32:42.381Z"}}