{"id":"e7a5bc54-6160-4f40-b122-31fbd7203531","shortId":"HUcaTk","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/cards/33` is listed under the generic label \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nDocumentation on the site 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 spec, no request/response schema documentation, and no description of what `/api/v1/cards/33` actually returns. The endpoint name \"cards\" and the numeric ID 33 suggest it may return a specific data card or record, but this is purely speculative. Prospective users should test the endpoint directly to determine its actual functionality.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","cards API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition for this endpoint; request and response formats are unknown.","The purpose of '/api/v1/cards/33' is unclear — 'Premium API Access' is a generic label with no specifics.","Cannot verify what data or functionality this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/33","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/33","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 virtually no documentation: no OpenAPI spec, no request/response schema, no description of what 'cards/33' actually provides. Docs pages are empty. The listing is effectively a 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'0.02':10,28,88,150 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':162 '0x8335':145 '20':139 '300':165 '33':218 '6':154 'Base network API' 'USDC micropayment API' 'accept':130 'access':6,24,44,119 'actual':208,244 'address':161 'ai':75 'analyt':74 'api':5,16,23,34,43,71,100,118,177 'application/json':122 'base':8,26,96,141,147 'base-network' 'broad':64 'call':70 'card':213,226 'cards API' 'catalog':65 'challeng':125 'commit':105 'confirm':126 'connect':186 'content':192 'data':73,225 'decim':155 'descript':204 'determin':242 'direct':240 'doc':176 'document':168,201 'endpoint':38,55,84,109,211,239 'equal':149 'extrem':173 'financ':78 'function':245 'gate':3,21 'generic':115 'given':151 'host':62 'id':217 'infrastructur':81 'json-response' 'key':17,35,101 'label':116 'learn':77 'limit':103 'list':112 'live':129 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':40,59 'machin':76 'mani':54 'maximum':136 'may':221 'name':212 'network':97 'no-api-key' 'numer':216 'offer':56 'one':52 'openapi':196 'page':181 'pay':9,27,68 'pay-per-cal':67 'pay-per-call API' 'pay-per-request' 'payment':48,137,157 'per':11,29,69,89 'platform':60 'post':131 'post-method' 'premium':4,22,42,117 'price':86,178 'prompt':188 'prospect':234 'protocol':49 'provid':41 'pure':232 'rate':102 'readm':180 'record':228 'render':183 'request':12,30,90,132 'request/response':199 'requir':18,36,106,134 'return':121,209,222 'schema':200 'second':166 'sent':159 'settl':91 'site':171 'span':72 'spars':174 'spec':197 'specif':108,224 'specul':233 'suggest':219 'test':237 'timeout':167 'unit':142 'usdc':14,32,93,144,152 'usdc-settlement' 'user':235 'util':82 'via':45 'wallet':187 'web3':79 'x402':2,20,47,124 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"ed45240d-1bfe-459e-b3a5-cbade2452fa8","listingId":"e7a5bc54-6160-4f40-b122-31fbd7203531","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:26.816Z"}],"sources":[{"listingId":"e7a5bc54-6160-4f40-b122-31fbd7203531","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:26.816Z","lastSeenAt":"2026-04-22T15:01:10.179Z"}],"details":{"listingId":"e7a5bc54-6160-4f40-b122-31fbd7203531","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/33 \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/33"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/33"}],"useCases":["Accessing premium data or content behind a per-request USDC paywall","Programmatic agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that can settle USDC payments on Base automatically","Users who want instant API access without signup or subscriptions"],"notFor":["Users needing well-documented, production-grade APIs with clear schemas","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.343Z"},"updatedAt":"2026-04-22T15:01:10.179Z"}}