{"id":"9594b6a0-8065-4ab9-a56c-91d921e73093","shortId":"NcJTea","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at `/api/v1/cards/84` 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/84` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The endpoint is live and returns a standard x402 payment challenge.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the \"exact\" scheme. The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02 per request. The platform advertises uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access. The endpoint accepts HTTP POST requests and returns `application/json`.\n\nDocumentation is extremely sparse — the docs, pricing, and API 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 the `/cards/84` resource actually returns. The `/cards/84` path does not appear in the site's listed API catalog, making it unclear whether this is a card-data endpoint, a content endpoint, or something else entirely. Prospective users should be aware that the actual payload and behavior of this specific endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","cards API"],"warnings":["The /cards/84 path is not listed among the provider's documented API endpoints — its purpose is unclear.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, no request body schema, and no response schema are available.","The exact data or service returned by this endpoint is undocumented and cannot be verified without paying."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/84","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/84","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 OpenAPI schema, no request/response examples, and the specific /cards/84 resource is not listed in the site's own API catalog. The actual functionality is 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'/cards/84':73,195,200 '/request':17,34,137 '0.02':16,33,129,136 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20':120 '6':126 'Base network API' 'USDC micropayment API' 'accept':153 'access':78,150 'across':139 'actual':197,237 'advertis':134 'ai':61 'amount':117 'analyt':60 'api':5,22,57,77,143,168,210 'appear':204 'application/json':159 'awar':234 'base':8,25,105,122 'base-network' 'behavior':240 'beyond':86 'call':12,29 'card':220 'card-data':219 'cards API' 'catalog':211 'challeng':99 'collect':48 'connect':174 'content':180,224 'contract':109 'data':59,221 'decim':127 'descript':191 'doc':165 'document':85,160 'els':228 'endpoint':6,23,36,90,141,152,222,225,244 'entir':229 'equal':128 'exact':81,113 'exampl':188 'extrem':162 'financ':64 'function':82 'gate':3,20 'http':154 'http-post' 'infrastructur':67 'instant':149 'json-response' 'key':144 'label':75,88 'learn':63 'limit':147 'list':209 'live':92 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':43 'machin':62 'make':212 'maximum':116 'network':106 'offer':46 'openapi':184 'page':169 'part':40 'path':201 'pay':10,27,54 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':53 'payload':238 'payment':98,100 'per':11,28,55,130 'platform':44,133 'post':155 'premium':4,21,76 'price':138,166 'prompt':176 'prospect':230 'protocol':52 'rate':146 'render':171 'request':56,131,156 'request/response':187 'requir':118 'resourc':71,196 'return':94,158,198 'schema':185 'scheme':114 'settl':102 'site':207 'someth':227 'span':58 'spars':163 'specif':70,243 'standard':96 'unclear':214 'undocu':246 'uniform':135 'unit':123 'usdc':14,31,108 'usdc-settlement' 'use':107 'user':231 'util':68 'via':111 'wallet':175 'web3':65 'whether':215 'x402':2,19,51,97 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"493716df-2b70-4af4-8315-3e4dedf38b65","listingId":"9594b6a0-8065-4ab9-a56c-91d921e73093","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:53.345Z"}],"sources":[{"listingId":"9594b6a0-8065-4ab9-a56c-91d921e73093","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:53.345Z","lastSeenAt":"2026-04-22T10:01:40.884Z"}],"details":{"listingId":"9594b6a0-8065-4ab9-a56c-91d921e73093","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/84 \\\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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/cards/84"},{"claim":"The platform advertises $0.02/request pricing, no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/cards/84"},{"claim":"Documentation pages render only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource via x402 micropayment","Agent-driven pay-per-call workflows without API key management","Demonstrating x402 protocol integration on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-request API access on Base","Low-friction micropayment API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch processing where per-request fees add up","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.977Z"},"updatedAt":"2026-04-22T10:01:40.884Z"}}