{"id":"66ce4291-9358-4b38-9b96-7f3fe8e9c73f","shortId":"7WHynV","kind":"x402","title":"Download backup data for April 2026 via x402 micropayment on Base network.","tagline":"Download backup data for April 2026 via x402 micropayment on Base network.","description":"This endpoint at lowpaymentfee.com provides access to a downloadable backup file for the period 2026-04, gated behind an x402 payment challenge. The endpoint accepts POST requests and returns application/json content upon successful payment of $0.02 in USDC on the Base network.\n\nThe provider lowpaymentfee.com hosts a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services — all priced at $0.02 per call with no API keys, no rate limits, and no commitments required. Payment is settled on-chain via the x402 protocol using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The specific endpoint `/api/v1/backups/2026-04/download` appears to serve a backup or data export for April 2026, though the exact contents and schema of the response are not documented beyond the MIME type.\n\nDocumentation on the site is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","data-download","backup-retrieval","pay-per-request"],"categories":["storage","data"],"synonyms":["backup download","data export","file download API","x402 backup","paid data access","Base USDC API"],"warnings":["No OpenAPI spec or schema documentation available","Docs/pricing/API pages render only 'Connect wallet' with no technical content","Exact contents and format of the backup response are unknown","The backup period '2026-04' is in the future relative to typical expectations, which is unusual"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2026-04/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/2026-04/download","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the purpose of the backup file is unexplained. Effectively a stub 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'/api/v1/backups/2026-04/download':124 '0.02':60,91 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '2026':6,18,39,135 'Base USDC API' 'accept':49 'access':30 'ai/ml':82 'analyt':81 'api':78,96,163 'appear':125 'application/json':54 'april':5,17,134 'avail':190 'backup':2,14,34,129 'backup download' 'backup-retrieval' 'base':11,23,65,120 'base-network' 'behind':42 'beyond':148 'call':93 'chain':110 'challeng':46 'commit':103 'connect':169 'content':55,139,194 'contract':117 'crawl':193 'data':3,15,80,131 'data export' 'data-download' 'detail':176 'doc':160 'document':147,152,185 'download':1,13,33 'endpoint':26,48,123 'exact':138 'exampl':189 'export':132 'extrem':157 'file':35 'file download API' 'financ':84 'gate':41 'host':70 'infer':83 'key':97 'limit':100 'lowpaymentfee.com':28,69 'micropay':9,21 'mime':150 'network':12,24,66 'on-chain':108 'openapi':180 'page':164 'paid data access' 'pay':75 'pay-per-request':74 'payment':45,58,105 'per':76,92 'period':38 'post':50 'price':89,161 'prompt':171 'protocol':114 'provid':29,68 'rate':99 'render':166 'request':51,77 'request/response':183 'requir':104 'respons':144 'return':53 'schema':141,184 'serv':127 'servic':87 'settl':107 'site':155 'span':79 'spars':158 'spec':181 'specif':122 'success':57 'suit':72 'technic':175 'though':136 'type':151 'upon':56 'usag':188 'usdc':62,116 'usdc-settlement' 'use':115 'util':86 'via':7,19,111 'wallet':170 'x402':8,20,44,113 'x402 backup' 'x402-payment'","prices":[{"id":"f3b902c6-e75b-4c6d-8c8a-d02efb5a44a4","listingId":"66ce4291-9358-4b38-9b96-7f3fe8e9c73f","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/2026-04/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":"2026-04-18T19:59:10.652Z"}],"sources":[{"listingId":"66ce4291-9358-4b38-9b96-7f3fe8e9c73f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2026-04/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:10.652Z","lastSeenAt":"2026-04-22T15:02:33.918Z"}],"details":{"listingId":"66ce4291-9358-4b38-9b96-7f3fe8e9c73f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2026-04/download \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-04/download"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-04/download"}],"useCases":["Downloading periodic backup data files programmatically","Automated retrieval of archived datasets for April 2026","Agent-driven data acquisition with on-chain micropayment"],"bestFor":["Agents needing on-demand backup file retrieval without API keys","Workflows requiring pay-per-use data downloads on Base","Automated systems that settle payments in USDC on L2"],"notFor":["Users needing free or subscription-based backup access","Applications requiring detailed API documentation before integration","High-frequency bulk downloads where per-request pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.747Z"},"updatedAt":"2026-04-22T15:02:33.918Z"}}