{"id":"2fd63ac1-5bc0-4907-ba57-09aa26ae7c79","shortId":"fwdMtF","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/6/transactions` behind the x402 payment protocol. It accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). The x402 challenge advertises a maximum amount of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the site-wide flat pricing of $0.02/request.\n\nThe provider's landing page lists a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02 USDC pricing and x402 payment model with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The specific purpose and data model of the `/api/v1/cards/6/transactions` endpoint (e.g., what \"cards/6\" refers to, what fields are accepted or returned) cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","USDC pay-per-call","Base network API","lowpaymentfee","micropayment API","402 payment endpoint"],"warnings":["No OpenAPI spec or schema available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The meaning of 'cards/6' in the URL path is unclear — it may be a hardcoded demo resource","No examples of successful responses are available from the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/6/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/6/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of '/api/v1/cards/6/transactions' is unexplained. This is effectively a stub 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'/api/v1/cards/6/transactions':41,207 '/docs':165 '/pricing':167 '/readme':169 '/request':95 '0.02':11,26,82,94,142 '000':72 '0x8335':61 '20':71 '2913':62 '402 payment endpoint' '6':77 'Base network API' 'USDC pay-per-call' 'accept':48,217 'advertis':66 'ai/ml':114 'amount':69 'analyt':113 'api':110,151 'avail':195,225 'base':9,24,56,73 'base-network' 'behind':42 'broad':103 'call':109 'cannot':220 'card':5,20,37 'card transactions API' 'card-transact':4,19 'card-transactions' 'cards/6':211 'catalog':104 'challeng':65 'classif':118 'commit':159 'connect':175 'consist':85 'contract':60 'convers':135 'crawl':198 'data':112,203 'decim':78 'detail':182 'determin':222 'document':160 'e.g':209 'embed':119 'endpoint':7,22,32,138,208 'equal':81 'estim':129 'exampl':194 'exchang':124 'expos':35 'extrem':162 'feed':123 'field':215 'financ':120 'flat':91 'gas':128 'gate':3,18 'generat':136 'geocod':133 'infer':115 'infrastructur':131 'key':152 'land':99 'limit':155 'list':101 'lowpaymentfee' 'lowpaymentfee.com':34 'materi':226 'maximum':68 'micropayment API' 'minimum':158 'model':148,204 'network':57 'no-api-key' 'openapi':186 'page':100,170 'pay':10,25,107 'pay-per-cal':106 'pay-per-request' 'payment':45,147 'per':12,27,83,108 'post':49 'post-endpoint' 'price':92,122,144 'prompt':177 'protocol':46 'provid':97 'purpos':201 'quot':127 'rate':125,154 'refer':212 'render':172 'request':13,28,50,84 'request/response':189 'resourc':39 'return':219 'schema':190 'sentiment':116 'settl':53 'share':139 'site':89 'site-wid':88 'span':111 'spec':187 'specif':200 'summar':117 'technic':181 'thin':163 'token':126 'transact':6,21,38 'unit':74 'usag':193 'usdc':15,30,59,80,143 'usdc-settlement' 'use':58 'util':132 'valid':134 'wallet':176 'web3':121 'wide':90 'x402':2,17,44,64,146 'x402 API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"ca55c8a0-0f1e-463a-8d75-189935a4fcc9","listingId":"2fd63ac1-5bc0-4907-ba57-09aa26ae7c79","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/6/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":"2026-04-18T18:43:42.465Z"}],"sources":[{"listingId":"2fd63ac1-5bc0-4907-ba57-09aa26ae7c79","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/6/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:42.465Z","lastSeenAt":"2026-04-24T18:32:23.728Z"}],"details":{"listingId":"2fd63ac1-5bc0-4907-ba57-09aa26ae7c79","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/6/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/6/transactions"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/6/transactions"}],"useCases":["Submitting or retrieving card transaction data via a pay-per-call model","Integrating x402 micropayments into agent workflows that need card transaction information","Programmatic access to card transaction records without traditional API key management"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need on-demand, keyless API access settled in USDC on Base","Low-volume or sporadic usage where $0.02/request flat pricing is attractive"],"notFor":["Production workloads requiring well-documented request/response schemas","High-volume use cases where per-request pricing adds up quickly","Users who need detailed API documentation or SDKs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.503Z"},"updatedAt":"2026-04-24T18:32:23.728Z"}}