{"id":"09318ec1-9d22-4637-bd53-7208f213abc9","shortId":"SRzFPH","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/endpoint-62` is part of lowpaymentfee.com, a platform offering a variety of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests, returning application/json responses. Payment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe x402 challenge indicates a maximum payment of 20,000 units of USDC (which, given USDC's 6 decimal places, equates to $0.02 per request). The platform advertises a flat $0.02/request pricing model with no API keys, no rate limits, no minimums, and instant access. However, this specific endpoint (`/api/endpoint-62`) is not listed among the documented API categories on the homepage, which enumerate paths like `/api/v1/analytics/metrics`, `/api/v2/ai/sentiment`, etc. There is no documentation describing what `/api/endpoint-62` actually does — no input schema, no output schema, and no usage examples are available.\n\nThe docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing the actual functionality behind this endpoint, callers should treat this as an opaque premium endpoint with uncertain capabilities. The x402 challenge is live and well-formed, confirming the endpoint is operational at the protocol level.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["api","x402"],"synonyms":["premium API","paid endpoint","x402 API","USDC API","lowpaymentfee","micropayment API","Base network API"],"warnings":["Endpoint /api/endpoint-62 is not listed among the documented APIs on the homepage — its actual functionality is unknown.","No input schema or output schema is documented; callers cannot know what data to send or expect back.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many endpoints at different paths; this specific endpoint may be a test or unlisted route."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-62","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/endpoint-62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, the endpoint path `/api/endpoint-62` is not documented anywhere on the site, there is no input/output schema, no examples, and no description of what the endpoint actually does. All documentation pages returned only 'Connect wallet' with no content. This is effectively a stub 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'/api/v1/analytics/metrics':153 '/api/v2/ai/sentiment':154 '/request':118 '0.02':109,117 '000':96 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':86 '20':95 '6':104 'Base network API' 'USDC API' 'accept':66 'access':64,132 'actual':163,198 'advertis':114 'ai/ml':51 'among':141 'analyt':50 'api':5,19,46,63,123,144,180 'application/json':70 'avail':176 'base':8,22,81 'base-network' 'behind':200 'caller':203 'capabl':214 'categori':145 'challeng':89,217 'confirm':224 'connect':188 'content':194 'contract':85 'data':49 'decim':105 'describ':160 'doc':178 'document':143,159 'endpoint':6,20,30,47,59,136,202,211,226 'enumer':150 'equat':107 'etc':155 'exampl':174 'finance/web3':53 'flat':116 'form':223 'function':199 'gate':3,17,45 'given':101 'handl':74 'homepag':148 'howev':133 'indic':90 'infer':52 'infrastructur':55 'input':166 'instant':131 'json-response' 'key':124 'know':196 'label':61 'level':232 'like':152 'limit':127 'list':140 'live':219 'lowpaymentfee' 'lowpaymentfee.com':36 'maximum':92 'micropayment API' 'minimum':129 'model':120 'network':82 'offer':39 'opaqu':209 'oper':228 'output':169 'page':183 'paid endpoint' 'part':34 'path':151 'pay':10,24 'pay-per-request':9,23 'payment':72,93 'per':11,25,110 'place':106 'platform':38,113 'post':67 'post-method' 'premium':4,18,62,210 'premium API' 'price':119,179 'prompt':190 'protocol':78,231 'rate':126 'readm':182 'request':12,26,68,111 'respons':71 'return':69,185 'schema':167,170 'span':48 'specif':58,135 'substant':193 'treat':205 'uncertain':213 'unit':97 'usag':173 'usdc':14,28,84,99,102 'usdc-payment' 'use':83 'util':56 'varieti':41 'via':75 'wallet':189 'well':222 'well-form':221 'without':195 'x402':2,16,44,77,88,216 'x402 API' 'x402-gated':1,15,43 'x402-payment'","prices":[{"id":"b28e6058-4726-4df1-aa93-97f34ebb3450","listingId":"09318ec1-9d22-4637-bd53-7208f213abc9","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/endpoint-62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:56.064Z"}],"sources":[{"listingId":"09318ec1-9d22-4637-bd53-7208f213abc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:56.064Z","lastSeenAt":"2026-04-23T05:00:37.206Z"}],"details":{"listingId":"09318ec1-9d22-4637-bd53-7208f213abc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-62 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns status 402 with USDC payment on Base network, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/endpoint-62"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-62"},{"claim":"Documented endpoints include analytics, AI/ML, finance, and utility categories but not /api/endpoint-62","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an x402-gated premium service on Base","Agent-driven pay-per-call API consumption without API keys","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-request API access","Projects already operating on the Base L2 network"],"notFor":["Users who need documented input/output schemas before calling","Anyone requiring free or subscription-based API access","Production workloads that need guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.183Z"},"updatedAt":"2026-04-23T05:00:37.206Z"}}