{"id":"978338e1-b2dc-4baf-b65b-7a60a5af3f4c","shortId":"Vy36k6","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/cards/78` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/cards/78` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. All endpoints on the platform share a uniform $0.02 per request pricing model, settled in USDC on the Base network via the x402 payment protocol.\n\nThe probe confirms the endpoint is live, returning a 402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is granted purely through per-call x402 payment.\n\nDocumentation is extremely sparse. The landing page lists many endpoints but provides no request/response schemas, parameter descriptions, or usage examples. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a \"Connect wallet\" prompt with no additional content. Because the specific purpose of `/api/v1/cards/78` is unclear and no schema is provided, agents should treat this as a low-documentation endpoint whose actual behavior must be discovered empirically.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","json-response","no-api-key","post-method"],"categories":["api","misc"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API","Base network API","lowpaymentfee","cards API"],"warnings":["The specific functionality of /api/v1/cards/78 ('Premium API Access') is undocumented and unknown.","No request parameters or response schema are available anywhere in the crawled content.","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no useful content.","The platform lists many endpoints but none have detailed documentation visible without a connected wallet."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/78","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the purpose of '/api/v1/cards/78' is entirely unclear. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/cards/78':32,215 '/cards/78':67 '/docs':193 '/pricing':194 '/readme':197 '0.02':10,24,91,135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':127 '20000':122 '2913':128 '402':117 '6':131 'Base network API' 'USDC API' 'accept':148 'access':72,162 'actual':234 'addit':208 'address':144 'advertis':161 'agent':223 'ai':55 'analyt':54 'api':5,19,51,71,155 'application/json':153 'base':8,22,101,123,130 'behavior':235 'beyond':80 'call':169 'cards API' 'challeng':118 'collect':42 'confirm':110 'connect':203 'content':209 'data':53 'decim':132 'descript':188 'discov':238 'document':79,172,231 'empir':239 'endpoint':6,20,30,84,112,147,181,232 'equal':134 'exact':75,141 'exampl':191 'extrem':174 'financ':58 'function':76 'gate':3,17 'grant':164 'infrastructur':61 'json-response' 'key':156 'label':69,82 'land':177 'learn':57 'limit':159 'list':179 'live':114 'low':230 'low-document':229 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'made':138 'mani':180 'maxamountrequir':120 'model':95 'must':236 'network':102 'no-api-key' 'offer':40 'page':178,198 'paramet':187 'part':34 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payment':106,136,171 'per':11,25,49,92,168 'per-cal':167 'per-request-billing' 'platform':38,87 'post':149 'post-method' 'premium':4,18,70 'premium API' 'price':94 'probe':109 'prompt':205 'protocol':46,107 'provid':183,222 'pure':165 'purpos':213 'rate':158 'render':200 'request':12,26,50,93,150 'request/response':185 'resourc':65 'return':115,152 'schema':186,220 'scheme':142 'settl':96 'share':88 'span':52 'spars':175 'specif':64,212 'treat':225 'unclear':217 'uniform':90 'unit':124 'usag':190 'usdc':14,28,98,126 'usdc-base' 'util':62 'via':103,139 'wallet':204 'web3':59 'whose':233 'x402':2,16,45,105,170 'x402 endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"a4190524-8de4-44fd-9cb4-0d72ef6b7dd7","listingId":"978338e1-b2dc-4baf-b65b-7a60a5af3f4c","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:59.468Z"}],"sources":[{"listingId":"978338e1-b2dc-4baf-b65b-7a60a5af3f4c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:59.468Z","lastSeenAt":"2026-04-22T10:31:29.796Z"}],"details":{"listingId":"978338e1-b2dc-4baf-b65b-7a60a5af3f4c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/78 \\\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":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/78"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/78"}],"useCases":["Accessing a premium data resource with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Exploring x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that can settle USDC payments on Base automatically","Use cases requiring keyless, commitment-free API access"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume use cases where per-call pricing may add up without bulk discounts","Anyone who needs to understand the endpoint's exact functionality before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.645Z"},"updatedAt":"2026-04-22T10:31:29.796Z"}}