{"id":"3df27514-e08d-4e0d-8894-e8b67c14eeab","shortId":"2YBDyy","kind":"x402","title":"x402-gated backup endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated backup endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path /api/v1/backups/25. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint /api/v1/backups/25 returns an x402 challenge requesting payment of up to 20,000 base units of USDC (contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the x402 \"exact\" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the \"backups/25\" resource actually returns. The endpoint accepts POST requests. Without further documentation it is unclear what request body (if any) is expected or what the response payload contains.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","backup-api","post-endpoint"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium API access","x402 backup","lowpaymentfee","paid backup endpoint","Base USDC API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request body or response payload for /api/v1/backups/25","Purpose of 'backups/25' resource is completely undocumented","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/25","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/backups/25","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 spec, no request/response schema, and no explanation of what the backup resource actually contains. The broader site lists many endpoints but provides zero docs beyond wallet-connect 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'/api/v1/backups/25':40,81 '/docs':161 '/pricing':162 '/readme':165 '/request':123 '0.02':110,122 '000':92 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':98 '20':91 '2913':99 '300':140 '6':105 'Base USDC API' 'accept':199 'access':35,154 'across':124 'actual':195 'advertis':118,145 'ai/ml':60 'analyt':59 'api':34,55,147 'backup':4,17 'backup API' 'backup-api' 'backups/25':193 'base':7,20,76,93,101 'bodi':210 'broader':46 'call':54 'challeng':85 'connect':171 'consist':113 'contain':220 'content':177 'contract':97 'data':58,63 'decim':106 'document':156,186,204 'dozen':49 'endpoint':5,18,28,56,80,126,198 'exact':133 'expect':214 'explan':189 'extrem':158 'finance/web3':62 'flat':119 'gate':3,16,68 'howev':155 'infer':61 'infrastructur':65 'instant':153 'key':148 'limit':151 'lowpaymentfee' 'lowpaymentfee.com':30 'made':129 'network':77 'offer':48 'openapi':181 'page':166 'paid backup endpoint' 'part':43 'path':39 'pay':9,22,52 'pay-per-cal':51 'pay-per-request':8,21 'payload':219 'payment':72,87,127 'per':10,23,53,111 'platform':47,144 'post':200 'post-endpoint' 'premium':33 'premium API access' 'price':120 'prompt':173 'protocol':73 'provid':31 'rate':150 'render':168 'request':11,24,86,112,201,209 'request/response':184 'resourc':36,194 'respons':218 'return':82,196 'schema':185 'scheme':134 'second':141 'sinc':102 'site':116 'span':57 'spec':182 'specif':79 'substant':176 'thin':159 'timeout':142 'translat':108 'unclear':207 'unit':94 'usdc':13,26,96,103 'usdc-base' 'use':104 'util':66 'via':69,130 'wallet':136,172 'without':202 'x402':2,15,71,84,132 'x402 backup' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"ac1d84c7-f43b-4404-9137-d01024d4cf35","listingId":"3df27514-e08d-4e0d-8894-e8b67c14eeab","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/backups/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:22.144Z"}],"sources":[{"listingId":"3df27514-e08d-4e0d-8894-e8b67c14eeab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:22.144Z","lastSeenAt":"2026-04-22T11:32:36.439Z"}],"details":{"listingId":"3df27514-e08d-4e0d-8894-e8b67c14eeab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/25\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/backups/25","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/25"},{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/25"}],"useCases":["Retrieving backup data via a micropayment-gated API call","Programmatic access to backup resource #25 with per-request USDC payment","Agent-driven data retrieval with no API key required"],"bestFor":["Developers wanting keyless, pay-per-call API access on Base","Agents that can settle x402 USDC payments automatically","Users who prefer no-subscription, usage-based pricing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who need bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.135Z"},"updatedAt":"2026-04-22T11:32:36.439Z"}}