{"id":"2de577a4-b38a-4d36-9111-3d4a43b2f779","shortId":"jxMVBp","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 is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all gated via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/cards/12` is listed under \"Premium API Access\" but its exact functionality is not documented beyond that label. The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access.\n\nPayment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 challenge confirms a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 — consistent with the site's advertised pricing. The endpoint accepts POST requests and returns application/json. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content.\n\nBecause the endpoint name \"cards/12\" and description \"Premium API Access\" are generic and the crawled documentation is essentially empty, it is unclear what data or service this specific endpoint returns. Agents should treat this as a live but poorly documented x402 endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api","payments"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific function of /api/v1/cards/12 is unknown; 'Premium API Access' is not descriptive","No request or response schema provided","No OpenAPI spec or examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The 'Premium API Access' label is entirely generic. Docs pages are empty beyond a wallet connect 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'0.02':10,24,89,128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20000':120 '6':125 'Base network API' 'USDC API' 'accept':138 'access':6,20,73,103,188 'across':45 'advertis':86,134 'agent':209 'ai/ml':48 'analyt':47 'api':5,19,44,72,96,163,187 'application/json':143 'base':8,22,62,112,121 'base-network' 'beyond':81,156 'broader':37 'cards/12':183 'categori':52 'challeng':115 'confirm':116 'connect':172 'consist':129 'content':178 'contract':109 'crawl':193 'data':46,202 'decim':126 'descript':185 'doc':162 'document':80,155,194,218 'empti':197 'endpoint':30,66,137,181,207,220 'equal':127 'essenti':196 'exact':76 'exampl':152 'finance/web3':49 'flat':88 'function':77 'gate':3,17,54 'generic':190 'howev':144 'infrastructur':51 'instant':102 'json-response' 'key':97 'label':83 'land':158 'limit':100 'list':69,160 'live':215 'lowpaymentfee' 'lowpaymentfee.com':32 'maxamountrequir':118 'micropayment API' 'model':93 'name':182 'network':63 'no-api-key' 'offer':39 'openapi':148 'page':159,167 'part':34 'pay':9,23,41 'pay-per-call API' 'pay-per-request':40 'payment':58,104 'per':11,25,42,90 'platform':38,85 'poor':217 'post':139 'premium':4,18,71,186 'premium API' 'price':92,135,164 'prompt':174 'protocol':59 'rate':99 'readm':166 'render':169 'request':12,26,43,91,140 'request/response':151 'return':142,208 'schema':149 'servic':204 'settl':106 'site':132 'specif':65,206 'treat':211 'unclear':200 'unit':122 'usdc':14,28,108 'usdc-settlement' 'via':55 'wallet':173 'x402':2,16,57,114,219 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1d32c7b6-bd32-4c54-ab41-9ec98f54e344","listingId":"2de577a4-b38a-4d36-9111-3d4a43b2f779","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:21.363Z"}],"sources":[{"listingId":"2de577a4-b38a-4d36-9111-3d4a43b2f779","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:21.363Z","lastSeenAt":"2026-04-22T15:01:09.587Z"}],"details":{"listingId":"2de577a4-b38a-4d36-9111-3d4a43b2f779","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/12 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/12"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/12"},{"claim":"Docs, API, pricing, and README 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-request workflows without API key management","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-per-call API access on Base","Testing x402 protocol flows with low-cost endpoints"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone needing clarity on what data the endpoint actually returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.598Z"},"updatedAt":"2026-04-22T15:01:09.587Z"}}