{"id":"bff88ff3-b0e4-4992-b124-c01b8d504320","shortId":"3kGTLJ","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 collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per call settled in USDC on the Base network.\n\nThe specific resource at `/api/v1/apikeys/37` appears to be an API-key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to the payee address 0x1A2B…85F3. The payment timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found beyond the landing page; the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.\n\nThe broader platform advertises no API keys required, no rate limits, and instant access for its other endpoints. However, the specific endpoint probed is labeled \"Premium API Access\" and sits under an `/apikeys/` path, suggesting it may issue or manage API keys. Without further documentation it is unclear exactly what payload to send or what the response contains.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-provisioning","post-endpoint"],"categories":["infrastructure","auth"],"synonyms":["lowpaymentfee","x402 api key","pay-per-call api","USDC micropayment API","Base network API","premium api access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Docs, pricing, API, and README pages all render only 'Connect wallet' with no substantive content.","The exact purpose of /api/v1/apikeys/37 is unclear — it may provision keys or grant access, but no details are documented.","No terms of service, rate limit details, or SLA information found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response payloads, and the docs/pricing/README pages are empty. The purpose of this specific endpoint is 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'/apikeys':208 '0.02':10,24,77,131 '000':120 '0x1a2b':136 '0x8335':125 '20':119 '2913':126 '300':142 '6':129 '85f3':137 'Base network API' 'USDC micropayment API' 'accept':110 'access':36,101,189,203 'address':135 'advertis':179 'ai':66 'analyt':65 'api':4,18,35,62,97,161,181,202,216 'api-key':96 'api-key-provisioning' 'appear':92 'base':8,22,85,121,128 'beyond':154 'broader':177 'call':79 'challeng':105 'collect':56 'confirm':106 'connect':169 'contain':233 'content':175 'crypto-paid API' 'data':64 'decim':130 'detail':147 'doc':159 'document':148,220 'endpoint':6,20,30,47,102,193,197 'exact':116,224 'exampl':150 'financ':69 'found':153 'gate':3,17 'host':54 'howev':194 'infrastructur':72 'instant':188 'issu':213 'key':5,19,98,182,217 'label':200 'land':156 'learn':68 'limit':186 'live':109 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':67 'manag':215 'mani':46 'may':212 'network':86 'offer':48 'one':44 'openapi':145 'page':157,164 'path':209 'pay':9,23,59 'pay-per-call api' 'pay-per-request':58 'paye':134 'payload':226 'payment':40,117,139 'per':13,27,60,78 'platform':52,178 'post':111 'post-endpoint' 'premium':34,201 'premium api access' 'price':75,160 'probe':198 'prompt':171 'protocol':41 'provid':33 'provis':99 'rate':185 'readm':163 'render':166 'request':14,28,61,112 'requir':114,183 'resourc':89 'respons':151,232 'schema':146 'second':143 'send':228 'settl':80 'sit':205 'span':63 'specif':88,196 'substant':174 'suggest':210 'timeout':140 'unclear':223 'unit':122 'usdc':12,26,82,124 'usdc-base' 'util':73 'via':37 'wallet':170 'web3':70 'without':218 'x402':2,16,39,104 'x402 api key' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c5953f58-b25c-4f65-944f-5d0d5bfac3c3","listingId":"bff88ff3-b0e4-4992-b124-c01b8d504320","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:30.818Z"}],"sources":[{"listingId":"bff88ff3-b0e4-4992-b124-c01b8d504320","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:30.818Z","lastSeenAt":"2026-04-23T06:31:45.919Z"}],"details":{"listingId":"bff88ff3-b0e4-4992-b124-c01b8d504320","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/37 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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/37"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/37"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatically purchasing or provisioning API keys via a single x402-paid POST request","Agents autonomously acquiring access credentials without traditional signup flows","Demonstrating x402 payment protocol integration for per-call billing"],"bestFor":["Developers experimenting with x402 payment-gated APIs on Base","AI agents that need to autonomously acquire API keys via crypto micropayments","Projects wanting no-signup, pay-per-use API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based API key management"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.086Z"},"updatedAt":"2026-04-23T06:31:45.919Z"}}