{"id":"74ae8c35-1718-4a85-825c-3790c1a30ed5","shortId":"mXsgxe","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at `/api/v1/benefits/5` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint is labeled \"Premium API Access\" and returns JSON responses. It is gated behind an x402 payment challenge requiring USDC on the Base network.\n\nThe x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. Payment is made via the x402 \"exact\" scheme to the specified payTo address, with a 300-second timeout. No API keys or rate limits are required; access is instant upon payment.\n\nHowever, the actual functionality behind `/api/v1/benefits/5` is unclear. The site's landing page lists specific API categories (analytics, AI, finance, utilities) but does not mention a `/benefits/5` route. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually returns, agents should treat this as a loosely documented premium access point whose concrete capabilities are unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key"],"categories":["general","api-gateway"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The endpoint path /api/v1/benefits/5 is not listed among the site's documented APIs — its actual functionality is unknown.","No OpenAPI schema, request body format, or response examples are available.","All documentation pages (docs, pricing, README) rendered only 'Connect wallet' with no substantive content.","The purpose and output of 'Premium API Access' cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/5","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/benefits/5","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 ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/benefits/5 is unknown — it does not appear in the site's listed API catalog. Docs pages are empty beyond a wallet-connect 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'/benefits/5':183 '/request':121 '0.02':111,120 '000':94 '0x8335':99 '20':93 '2913':100 '300':141 '6':106 'Base network API' 'USDC API' 'access':66,152,228 'across':123 'actual':159,217 'address':138 'advertis':88 'agent':219 'ai':175 'ai/ml':53 'amount':91 'analyt':52,174 'api':5,19,49,65,145,172 'base':8,22,83,95,102 'behind':74,161 'call':12,26 'capabl':232 'categori':173 'challeng':78,87 'collect':40 'concret':231 'connect':205 'consist':114 'content':211 'data':51 'decim':107 'detail':191 'doc':196 'document':192,226 'endpoint':6,20,30,61,125,216 'exact':132 'exampl':189 'financ':176 'finance/web3':55 'found':194 'function':160 'gate':3,17,73 'howev':157 'infer':54 'infrastructur':57 'instant':154 'json':69 'json-response' 'key':146 'know':213 'label':63 'land':168 'limit':149 'list':170 'loos':225 'lowpaymentfee' 'lowpaymentfee.com':37 'made':128 'maximum':90 'mention':181 'micropayment API' 'network':84 'no-api-key' 'openapi':186 'page':169,200 'part':34 'pay':10,24,46 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':45 'payment':77,126,156 'payto':137 'per':11,25,47,112 'platform':38 'point':229 'premium':4,18,64,227 'premium API' 'price':122,197 'prompt':207 'protocol':44 'rate':148 'readm':199 'render':202 'request':48,113 'request/response':188 'requir':79,151 'respons':70 'return':68,218 'rout':184 'schema':187 'scheme':133 'second':142 'sinc':103 'site':117,166 'span':50 'specif':60,171 'specifi':136 'substant':210 'timeout':143 'translat':109 'treat':221 'unclear':164 'uniform':119 'unit':96 'unverifi':234 'upon':155 'usdc':14,28,80,98,104 'usdc-base' 'use':105 'util':58,177 'via':129 'wallet':206 'whose':230 'without':212 'x402':2,16,43,76,86,131 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"7cab722b-f00b-46e6-8303-286746edab9a","listingId":"74ae8c35-1718-4a85-825c-3790c1a30ed5","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/benefits/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:35.902Z"}],"sources":[{"listingId":"74ae8c35-1718-4a85-825c-3790c1a30ed5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:35.902Z","lastSeenAt":"2026-04-22T05:31:53.879Z"}],"details":{"listingId":"74ae8c35-1718-4a85-825c-3790c1a30ed5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/5 \\\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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/benefits/5"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/5"},{"claim":"Site advertises $0.02/request uniform pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium data or service endpoint with per-request USDC micropayments","Integrating x402-compatible payment flows into agent workflows","Testing x402 protocol payment challenges on Base network"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that can settle USDC payments on Base","Use cases requiring keyless, rate-limit-free API access"],"notFor":["Users needing well-documented, schema-defined API contracts","Production workloads requiring guaranteed SLAs or known response formats","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.39Z"},"updatedAt":"2026-04-22T05:31:53.879Z"}}