{"id":"49cd9ac6-047b-4ed0-ab65-987d0b412aeb","shortId":"QxHMtH","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific resource `/api/v1/cards/99` is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints share a uniform pricing model of $0.02 per request, settled in USDC (USD Coin) on Base.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the x402 exact scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The `maxAmountRequired` is 20000 base units, which at 6 decimals equals $0.02. The provider advertises no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality of `/api/v1/cards/99` is unclear. The provider's landing page lists many endpoints across different domains but does not include a `/cards/` route in its public catalog. There is no OpenAPI schema, no detailed documentation (the docs, pricing, and README pages all render only a \"Connect wallet\" prompt), and no example request/response payloads available. The actual data returned by this endpoint is unknown — it could be a card-related resource (e.g., payment cards, trading cards, or informational cards) but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","cards API","premium access endpoint"],"warnings":["The /api/v1/cards/99 path is not listed in the provider's public API catalog — its purpose is unclear.","No OpenAPI schema or documentation is available for this endpoint.","All documentation pages (docs, pricing, README) render only a 'Connect wallet' prompt with no actual content.","Response format and fields are completely unknown — no example responses available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/99","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, the specific purpose of /api/v1/cards/99 is undocumented, there is no OpenAPI schema, no example requests or responses, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The actual functionality is 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'/cards':166 '0.02':10,24,80,129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20000':121 '6':126 'Base network API' 'USDC micropayment API' 'accept':99 'access':6,20,36,141 'across':158 'actual':200 'address':111 'advertis':132 'ai':64 'analyt':63 'api':5,19,35,134 'avail':198 'base':8,22,43,89,117,122 'base-network' 'behind':37 'card':213,218,220,223 'card-rel':212 'cards API' 'catalog':171 'categori':60 'challeng':92 'coin':87 'confirm':93 'connect':190 'could':209 'data':62,201 'decim':127 'detail':178 'differ':159 'doc':181 'document':179 'domain':160 'e.g':216 'endpoint':30,53,73,95,157,205 'equal':128 'exact':108 'exampl':195 'financ':67 'function':145 'gate':3,17 'howev':142 'includ':61,164 'inform':222 'infrastructur':70 'instant':140 'key':135 'land':153 'learn':66 'limit':138 'list':155 'live':97 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':65 'made':104 'mani':52,156 'maxamountrequir':119 'model':78 'network':44 'no-api-key' 'offer':54 'one':50 'openapi':175 'page':154,185 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payload':197 'payment':102,217 'paywal':40 'per':11,25,81 'post':100 'post-endpoint' 'premium':4,18,34 'premium access endpoint' 'price':77,182 'prompt':192 'provid':33,57,131,151 'public':170 'rate':137 'readm':184 'relat':214 'render':187 'request':12,26,82,101 'request/response':196 'resourc':47,215 'return':202 'rout':167 'schema':176 'scheme':109 'settl':83 'share':74 'span':59 'specif':46,144 'specul':227 'trade':219 'unclear':149 'uniform':76 'unit':123 'unknown':207 'usd':86 'usdc':14,28,85,114 'usdc-settlement' 'use':113 'util':71 'via':105 'wallet':191 'web3':68 'x402':2,16,39,91,107 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ba8ffb4a-c079-4709-8f76-6d436591362e","listingId":"49cd9ac6-047b-4ed0-ab65-987d0b412aeb","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:55.170Z"}],"sources":[{"listingId":"49cd9ac6-047b-4ed0-ab65-987d0b412aeb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:55.170Z","lastSeenAt":"2026-04-22T15:01:12.265Z"}],"details":{"listingId":"49cd9ac6-047b-4ed0-ab65-987d0b412aeb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/99 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/99"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/99"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium data resource with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Integrating x402-compatible payment flows into automated workflows"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing keyless, pay-per-use API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.901Z"},"updatedAt":"2026-04-22T15:01:12.265Z"}}