{"id":"305f0a7d-b085-4316-b6c5-d9d95f2472d9","shortId":"CpCRGR","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/88` 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 `/api/v1/cards/88` resource is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The platform advertises a flat $0.02 per request across all endpoints.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The probe confirms the endpoint is live, returning a 402 challenge with `maxAmountRequired` of 20,000 base units (USDC has 6 decimals, so this equals $0.02). The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised — access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what `/api/v1/cards/88` actually returns. The broader site lists 16 endpoints across four categories, but none of them correspond to `/api/v1/cards/88`, making it unclear whether this is a standalone resource or part of an unlisted category. Prospective users should be aware that without documentation, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","cards API"],"warnings":["The specific endpoint /api/v1/cards/88 is not listed among the 16 documented APIs on the site — its purpose is unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no actual content.","No OpenAPI schema, no request body schema, and no response examples are available.","The label 'Premium API Access' is generic and does not describe what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/88","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/cards/88' is entirely undescribed. This is effectively a stub 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'0.02':10,24,87,133 '000':123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '16':203 '20':122 '300':141 '402':117 '6':128 'Base network API' 'USDC micropayment API' 'access':71,152 'across':90,205 'actual':197,239 'advertis':84,151 'ai':55 'analyt':54 'api':5,19,51,70,145,167 'awar':234 'base':8,22,102,124 'behavior':240 'beyond':79 'broader':200 'cards API' 'categori':207,229 'challeng':118 'collect':42 'confirm':110 'connect':176 'content':182 'contract':106 'correspond':212 'data':53 'decim':129 'descript':193 'doc':166 'document':78,161,237 'endpoint':6,20,30,92,112,204,243 'equal':132 'exact':74,138 'exampl':190 'extrem':163 'financ':58 'flat':86 'four':206 'function':75 'gate':3,17 'grant':154 'handl':95 'header':160 'infrastructur':61 'json-response' 'key':146 'label':68,81 'learn':57 'limit':149 'list':202 'live':114 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'make':215 'maxamountrequir':120 'network':103 'no-api-key' 'none':209 'offer':40 'openapi':186 'page':171 'part':34,225 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payment':93,135,159 'per':11,25,49,88 'platform':38,83 'premium':4,18,69 'price':168 'probe':109 'prompt':178 'prospect':230 'protocol':46,99 'pure':155 'rate':148 'readm':170 'render':173 'request':12,26,50,89 'request/response':189 'resourc':66,223 'return':115,198 'schema':187 'scheme':136 'second':142 'site':201 'span':52 'spars':164 'specif':64 'standalon':222 'timeout':143 'unclear':217 'unit':125 'unknown':245 'unlist':228 'usdc':14,28,105,126 'usdc-base' 'use':104 'user':231 'util':62 'via':96 'wallet':177 'web3':59 'whether':218 'without':236 'x402':2,16,45,98,158 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"bf678be2-1bb6-4ac8-bf92-e1802e407918","listingId":"305f0a7d-b085-4316-b6c5-d9d95f2472d9","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:57.628Z"}],"sources":[{"listingId":"305f0a7d-b085-4316-b6c5-d9d95f2472d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:57.628Z","lastSeenAt":"2026-04-22T10:31:29.689Z"}],"details":{"listingId":"305f0a7d-b085-4316-b6c5-d9d95f2472d9","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl (you need an x402-compatible client to generate the payment):\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/88 \\\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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/88"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/88"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium data resource via a single micropayment without account signup","Agent-driven API consumption where payment is embedded in the HTTP request","Exploring x402-protocol pay-per-request patterns on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can attach x402 payment headers automatically","Users who want no-signup, no-API-key access to paid endpoints"],"notFor":["Anyone needing documented, well-specified API contracts before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.856Z"},"updatedAt":"2026-04-22T10:31:29.689Z"}}