{"id":"6eeecb38-f71c-43ac-985a-e17c1f4b909b","shortId":"3nXtba","kind":"x402","title":"Download September 2023 backup data via x402 micropayment on Base (USDC).","tagline":"Download September 2023 backup data via x402 micropayment on Base (USDC).","description":"This endpoint at lowpaymentfee.com provides access to a downloadable backup file dated September 2023. It is part of a broader platform offering dozens of pay-per-request API endpoints across data analytics, AI/ML inference, finance, crypto, and utility categories — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/backups/2023-09/download` accepts POST requests and returns an `application/json` response upon successful payment. The x402 challenge confirms the endpoint is live, requiring a maximum of $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base L2 network, with a 300-second timeout window.\n\nThe platform advertises a simple pricing model of $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments required. Documentation pages exist at `/docs`, `/pricing`, and `/api` but currently render only a wallet-connect prompt with no substantive content, making it difficult to determine the exact schema of request parameters or the structure of the backup data returned.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","backup-download","pay-per-request","no-api-key"],"categories":["storage","data"],"synonyms":["backup download API","data export","x402 backup","paid data download","Base USDC API","micropayment backup","lowpaymentfee"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) render only a wallet-connect prompt with no usable content","No OpenAPI or schema definition available for request or response bodies","The nature and contents of the 'backup' data are completely undocumented","Request body parameters (if any) are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2023-09/download","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/2023-09/download","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 confirms pricing and network details, but there is no OpenAPI schema, no documentation content (all doc pages render only a wallet-connect prompt), no example responses, and no description of what the backup data actually contains. The endpoint path suggests a static archived resource but its contents and request parameters are entirely 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'/api/v1/backups/2023-09/download':79 '/docs':162 '/pricing':163 '0.02':103,140 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':120 '20':106 '2023':3,14,36 '300':128 '6':113 'Base USDC API' 'accept':80 'access':28 'across':53,143 'address':119 'advertis':134 'ai/ml':56 'analyt':55 'api':51,148 'application/json':86 'backup':4,15,32,195 'backup download API' 'backup-download' 'base':10,21,72,108,123 'base-network' 'behind':65 'broader':42 'categori':62 'challeng':93 'commit':156 'confirm':94 'connect':173 'content':178 'crypto':59 'current':167 'data':5,16,54,196 'data export' 'date':34 'decim':114 'determin':183 'difficult':181 'document':158 'download':1,12,31 'dozen':45 'endpoint':24,52,78,96,145 'exact':185 'exist':160 'file':33 'financ':58 'gate':64 'infer':57 'key':149 'l2':124 'limit':152 'live':98 'lowpaymentfee' 'lowpaymentfee.com':26 'made':117 'make':179 'maximum':101 'micropay':8,19 'micropayment backup' 'minimum':155 'model':138 'network':73,125 'no-api-key' 'offer':44 'page':159 'paid data download' 'paramet':189 'part':39 'pay':48 'pay-per-request':47 'payment':68,90,115 'per':49,104,141 'platform':43,133 'post':81 'price':137 'prompt':174 'protocol':69 'provid':27 'rate':151 'render':168 'request':50,82,105,142,188 'requir':99,157 'respons':87 'return':84,197 'schema':186 'second':129 'septemb':2,13,35 'simpl':136 'specif':77 'structur':192 'substant':177 'success':89 'timeout':130 'unit':109 'upon':88 'usdc':11,22,75,111 'usdc-settlement' 'use':74 'util':61 'via':6,17 'wallet':172 'wallet-connect':171 'window':131 'x402':7,18,67,92 'x402 backup' 'x402-payment'","prices":[{"id":"c4212e9b-bd85-48e5-bcee-e6e15258e3d1","listingId":"6eeecb38-f71c-43ac-985a-e17c1f4b909b","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/2023-09/download","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:50.435Z"}],"sources":[{"listingId":"6eeecb38-f71c-43ac-985a-e17c1f4b909b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2023-09/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:50.435Z","lastSeenAt":"2026-04-22T16:32:25.962Z"}],"details":{"listingId":"6eeecb38-f71c-43ac-985a-e17c1f4b909b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2023-09/download \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/backups/2023-09/download","method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment of 20000 base units (maxAmountRequired) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-09/download"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USD Coin)","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-09/download"}],"useCases":["Downloading archived backup data from September 2023","Programmatic retrieval of historical data snapshots via micropayment","Agent-driven data acquisition without API key registration"],"bestFor":["Users needing one-off access to archived September 2023 backup data","Agents that can settle x402 payments in USDC on Base","Developers who want keyless, pay-per-use data access"],"notFor":["Users who need real-time or current data (this is a static 2023-09 backup)","Anyone without a Base-compatible USDC wallet","Bulk download scenarios where per-request pricing would be cost-inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.139Z"},"updatedAt":"2026-04-22T16:32:25.962Z"}}