{"id":"45ff226c-33b1-4f63-890e-405c3f1611b0","shortId":"vja4MM","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/78/transactions` behind an x402 payment challenge. It accepts HTTP POST requests and requires an X-PAYMENT header carrying a USDC payment on the Base network. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals), consistent with the site-wide $0.02/request pricing advertised on the provider's landing page.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all at the same $0.02 per request price point. This specific endpoint appears to be a card-transactions resource (path includes `/cards/78/transactions`), but no detailed documentation, request schema, or response schema is available. The docs, pricing, API, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further content.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation beyond the landing page listing, the actual behavior of this endpoint is unclear. It is live (returns a valid 402 challenge), but consumers should be aware that the lack of documentation makes integration speculative. The endpoint settles payments to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","http-post"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","card data endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only a 'Connect wallet' prompt","No request or response schema provided; integration is speculative","The specific resource '/api/v1/cards/78/transactions' is not listed on the provider's landing page catalog, raising questions about its intended use","No OpenAPI or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/78/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/78/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 with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The actual purpose and data returned by this card-transactions endpoint are entirely 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'/cards/78/transactions':147 '/request':94 '0.02':80,93,129 '000':75 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':229 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':234 '20':74 '402':209 '6':85 'Base network API' 'USDC micropayment API' 'accept':48 'actual':196 'advertis':96 'ai/ml':118 'amount':69 'analyt':117 'api':114,162 'appear':137 'avail':158 'awar':215 'base':9,24,65,76,236 'behavior':197 'behind':42 'beyond':190 'broad':108 'call':13,28,72 'card':5,20,37,142 'card data endpoint' 'card transactions API' 'card-transact':4,19,141 'card-transactions' 'carri':59 'catalog':109 'challeng':46,210 'connect':171 'consist':87 'consum':212 'content':177 'contract':233 'data':116,121 'decim':86 'detail':150 'doc':160 'document':151,189,220 'endpoint':7,22,32,136,200,225 'exampl':186 'expos':35 'finance/web3':120 'gate':3,18,113 'header':58 'host':106 'http':49 'http-post' 'includ':146 'infer':119 'infrastructur':123 'integr':222 'lack':218 'land':101,192 'list':194 'live':205 'lowpaymentfee' 'lowpaymentfee.com':34,105 'make':221 'maximum':68 'minim':170 'network':66 'openapi':182 'page':102,165,193 'path':145 'pay':11,26 'pay-per-cal':10,25 'pay-per-call API' 'pay-per-request' 'payment':45,57,62,227 'per':12,27,71,130 'point':133 'post':50 'price':95,132,161 'prompt':173 'provid':99,104 'readm':164 'request':51,131,152 'request/response':185 'requir':53,70 'resolv':167 'resourc':39,144 'respons':155 'return':206 'schema':153,156 'settl':226 'sinc':82 'site':91 'site-wid':90 'span':115 'spec':183 'specif':135 'specul':223 'transact':6,21,38,143 'unclear':202 'unit':77 'usd':81 'usdc':15,30,61,79,83,232 'usdc-base' 'use':84,230 'util':124 'valid':208 'wallet':172 'wide':92 'x':56 'x-payment':55 'x402':2,17,44,112 'x402 API' 'x402-gated':1,16,111 'x402-payment'","prices":[{"id":"c469a9d5-952b-40df-857c-2bc2990712f9","listingId":"45ff226c-33b1-4f63-890e-405c3f1611b0","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/78/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":"2026-04-18T18:44:03.084Z"}],"sources":[{"listingId":"45ff226c-33b1-4f63-890e-405c3f1611b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/78/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:03.084Z","lastSeenAt":"2026-04-24T14:32:42.935Z"}],"details":{"listingId":"45ff226c-33b1-4f63-890e-405c3f1611b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/78/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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/78/transactions"},{"claim":"Site-wide pricing is $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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/78/transactions"}],"useCases":["Fetching card transaction records via a pay-per-call model","Integrating card transaction data into agent workflows without API keys","Programmatic access to card transaction information settled in USDC on Base"],"bestFor":["Agents or apps needing card transaction data without subscription commitments","Developers who prefer crypto-native pay-per-request billing","Low-volume or sporadic access to card transaction records"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.518Z"},"updatedAt":"2026-04-24T14:32:42.935Z"}}