{"id":"7b0b3a3b-fa1a-458f-b00d-c23b82c03f93","shortId":"W3p5D9","kind":"x402","title":"Download backup archive for March 2026 via x402 micropayment on Base network.","tagline":"Download backup archive for March 2026 via x402 micropayment on Base network.","description":"This endpoint at lowpaymentfee.com provides access to a downloadable backup file for the period 2026-03, gated behind an x402 payment challenge. The endpoint accepts POST requests and returns application/json content upon successful payment. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via USDC on the Base network.\n\nThe x402 challenge specifies a maximum cost of 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 platform's uniform $0.02/request pricing. No API keys or rate limits are required; callers simply attach a valid X-PAYMENT header with a signed payment to the specified payTo address.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the backup file actually contains. The endpoint is live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data is delivered after payment.","tags":[],"capabilities":["x402-payment","usdc-base","backup-download","pay-per-request","no-api-key"],"categories":["storage"],"synonyms":["backup download","data export","archive download","x402 backup","lowpaymentfee backup","Base USDC API","paid file download"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format.","The nature and contents of the 'backup' file for 2026-03 are completely undocumented.","The backup date (2026-03) is in the future relative to current knowledge, raising questions about what data this actually serves."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2026-03/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/2026-03/download","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The purpose of the 'backup' data is entirely unexplained, making this effectively a stub 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'/request':131 '0.02':121,130 '000':103 '0x8335':109 '20':102 '2026':6,18,39 '2913':110 '402':209 '6':116 'Base USDC API' 'accept':49 'access':30 'actual':200 'address':158 'ai/ml':79 'analyt':78 'api':75,134,168 'application/json':54 'archiv':3,15 'archive download' 'attach':143 'backup':2,14,34,198 'backup download' 'backup-download' 'base':11,23,92,104,112 'behind':42 'broader':64 'caller':141 'challeng':46,96,210 'connect':177 'consist':124 'contain':201 'content':55,183 'contract':108 'cost':100 'crypto':82 'data':77,222 'data export' 'decim':117 'deliv':224 'descript':194 'difficult':218 'doc':167 'document':159,215 'download':1,13,33 'dozen':69 'endpoint':26,48,203 'exampl':191 'extrem':164 'file':35,199 'financ':81 'gate':41 'header':149 'infer':80 'key':135 'know':220 'lack':213 'limit':138 'live':205 'lowpaymentfee backup' 'lowpaymentfee.com':28,66 'make':216 'march':5,17 'maximum':99 'micropay':9,21 'network':12,24,93 'no-api-key' 'offer':68 'openapi':187 'page':172 'paid file download' 'part':61 'pay':72 'pay-per-request':71 'payment':45,58,148,153,226 'payto':157 'per':73,122 'period':38 'platform':65,127 'post':50 'price':132,169 'prompt':179 'proper':208 'provid':29 'rate':137 'readm':171 'render':174 'request':51,74,123 'request/response':190 'requir':140 'return':53,206 'schema':188 'servic':85 'settl':87 'sign':152 'simpli':142 'sinc':113 'site':162 'span':76 'specifi':97,156 'success':57 'thin':165 'translat':119 'uniform':129 'unit':105 'upon':56 'usdc':89,107,114 'usdc-base' 'use':115 'util':84 'valid':145 'via':7,19,88 'wallet':178 'x':147 'x-payment':146 'x402':8,20,44,95 'x402 backup' 'x402-payment'","prices":[{"id":"055e358a-3a10-44ea-8a4d-975dec424a9f","listingId":"7b0b3a3b-fa1a-458f-b00d-c23b82c03f93","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/2026-03/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":"2026-04-18T19:59:11.895Z"}],"sources":[{"listingId":"7b0b3a3b-fa1a-458f-b00d-c23b82c03f93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2026-03/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:11.895Z","lastSeenAt":"2026-04-22T13:32:02.958Z"}],"details":{"listingId":"7b0b3a3b-fa1a-458f-b00d-c23b82c03f93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2026-03/download \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-03/download"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-03/download"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Downloading a March 2026 backup archive via automated micropayment","Agent-driven retrieval of periodic backup snapshots","Programmatic access to archived data without API key management"],"bestFor":["Agents that need to fetch backup files with crypto micropayments","Workflows requiring keyless, pay-per-use data downloads on Base network","Automated systems that settle per-request via x402 USDC"],"notFor":["Users who need detailed documentation or schema before purchasing","Bulk download scenarios where per-request pricing is inefficient","Anyone requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.644Z"},"updatedAt":"2026-04-22T13:32:02.958Z"}}