{"id":"346bc3fc-8b09-4872-95cf-8c20b6d35912","shortId":"d8HBJs","kind":"x402","title":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","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 variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/97` appears to be an API key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…0913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme with a 300-second timeout.\n\nThe broader platform advertises no API keys required, no rate limits, and instant access for all its endpoints. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schema of this specific endpoint remain unclear. There is no OpenAPI spec, no request/response examples, and no detailed documentation available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","api-key-provisioning","pay-per-request","no-rate-limits"],"categories":["infrastructure","auth"],"synonyms":["API key generation","premium API access","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI specification or schema available","Documentation pages (/docs, /pricing, /README) contain no substantive content","The exact purpose and response format of /api/v1/apikeys/97 is unclear — 'Premium API Access' is vague","No request body schema or response examples are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/97","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/apikeys/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation, no request/response schema, and no examples. The docs, pricing, and README pages all returned only 'Connect wallet' with no content. The purpose of this specific endpoint (apikeys/97) is 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'/docs':173 '/pricing':174 '/readme':175 '0.02':10,24,79,132 '000':121 '0913':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x8335':126 '20':120 '300':150 '6':136 'API key generation' 'Base network API' 'USDC micropayment API' 'accept':110 'access':36,101,166 'actual':188 'address':142 'advertis':156 'ai':63 'analyt':62 'api':4,18,35,58,97,158 'api-key-provisioning' 'appear':93 'avail':211 'base':8,22,87,122,129 'behavior':189 'broader':154 'categori':59 'challeng':105 'confirm':106 'connect':179 'content':185 'crawl':214 'data':61 'decim':137 'detail':209 'document':171,210 'endpoint':6,20,30,47,72,91,102,170,196 'equal':131 'exact':146 'exampl':206 'financ':66 'gate':3,17 'given':133 'host':54 'includ':60 'infrastructur':69 'instant':165 'key':5,19,98,159 'learn':65 'limit':163 'live':109 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':64 'made':140 'mani':46 'network':88 'no-rate-limits' 'offer':48 'one':44 'openapi':202 'page':172 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payment':40,116,138 'per':13,27,80 'platform':52,75,155 'post':111 'premium':34 'premium API access' 'price':77 'prompt':181 'protocol':41 'provid':33 'provis':99 'rate':162 'remain':197 'request':14,28,81,112 'request/response':205 'requir':114,160 'respons':191 'return':176 'schema':192 'scheme':147 'second':151 'settl':82 'spec':203 'specif':90,195 'substant':184 'timeout':152 'unclear':198 'unit':123 'usdc':12,26,84,125,134 'usdc-base' 'use':144 'util':70 'varieti':56 'via':37 'wallet':180 'web3':67 'x402':2,16,39,104 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e6f8ab78-d734-49af-8b04-075d9b72d493","listingId":"346bc3fc-8b09-4872-95cf-8c20b6d35912","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/apikeys/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:35.566Z"}],"sources":[{"listingId":"346bc3fc-8b09-4872-95cf-8c20b6d35912","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:35.566Z","lastSeenAt":"2026-04-23T06:31:46.076Z"}],"details":{"listingId":"346bc3fc-8b09-4872-95cf-8c20b6d35912","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/97 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/apikeys/97"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/97"}],"useCases":["Programmatically obtaining or accessing API keys via a single micropayment","Agents purchasing API access on-demand without pre-registration","Pay-per-use API key provisioning for automated workflows"],"bestFor":["AI agents needing on-demand API key access without signup","Developers who want pay-per-request access with no commitments","Crypto-native applications settling microtransactions on Base"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.871Z"},"updatedAt":"2026-04-23T06:31:46.076Z"}}