{"id":"1d8a69de-168e-477d-abbc-430189bf8a26","shortId":"JURtJt","kind":"x402","title":"Download March 2025 backup data via x402 micropayment on Base network for $0.02 per request.","tagline":"Download March 2025 backup data via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to a downloadable backup file for March 2025 via the x402 payment protocol. It is part of a broader platform offering various 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, rate limits, or subscriptions required.\n\nThe specific endpoint `/api/v1/backups/2025-03/download` accepts POST requests and returns application/json content. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The x402 challenge confirms the endpoint is live and discoverable.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema beyond the outputSchema stub in the 402 challenge, and no description of what the backup file actually contains. The endpoint's purpose (what data is backed up, format, size) remains unclear from available materials.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","file-download","backup-retrieval","pay-per-request"],"categories":["storage","data"],"synonyms":["backup download","data export","file retrieval","x402 API","micropayment endpoint","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or request/response schema provided","Purpose of the backup file (what data, format, size) is completely undocumented","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-03/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/2025-03/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what the backup contains. Effectively a stub 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'0.02':13,28,76,120 '000':116 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':109 '20':115 '2025':3,18,44 '402':176 '6':124 'Base USDC API' 'accept':92 'access':36 'actual':186 'ai/ml':67 'amount':113 'analyt':66 'api':63,81,145 'application/json':97 'avail':202 'back':195 'backup':4,19,40,184 'backup download' 'backup-retrieval' 'base':10,25,104,117 'base-network' 'beyond':170 'broader':55 'call':78 'challeng':128,177 'confirm':129 'connect':154 'contain':187 'content':98 'contract':108 'data':5,20,65,193 'data export' 'decim':125 'descript':180 'detail':161 'discover':135 'doc':144 'document':136 'download':1,16,39 'endpoint':32,90,131,189 'extrem':141 'file':41,185 'file retrieval' 'file-download' 'financ':69 'format':197 'given':121 'i.e':119 'infer':68 'key':82 'limit':84 'live':133 'lowpaymentfee' 'lowpaymentfee.com':34 'march':2,17,43 'materi':203 'maximum':112 'micropay':8,23 'micropayment endpoint' 'network':11,26,105 'offer':57 'openapi':165 'outputschema':172 'page':149 'part':52 'pay':60 'pay-per-request':59 'payment':48,99 'per':14,29,61,77 'platform':56 'post':93 'price':74,146 'prompt':156 'protocol':49 'provid':35 'purpos':191 'rate':83 'readm':148 'remain':199 'render':151 'request':15,30,62,94 'request/response':168 'requir':87 'return':96 'schema':169 'servic':72 'settl':101 'site':139 'size':198 'span':64 'spars':142 'spec':166 'specif':89 'stub':173 'subscript':86 'technic':160 'unclear':200 'unit':118 'usdc':107,122 'usdc-settlement' 'use':106 'util':71 'various':58 'via':6,21,45 'wallet':155 'x402':7,22,47,127 'x402 API' 'x402-payment'","prices":[{"id":"7409d11b-668c-4dea-9150-0159ce3eeb8f","listingId":"1d8a69de-168e-477d-abbc-430189bf8a26","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/2025-03/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":"2026-04-18T19:59:14.938Z"}],"sources":[{"listingId":"1d8a69de-168e-477d-abbc-430189bf8a26","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-03/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:14.938Z","lastSeenAt":"2026-04-22T13:32:03.115Z"}],"details":{"listingId":"1d8a69de-168e-477d-abbc-430189bf8a26","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-03/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 on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-03/download"},{"claim":"Payment is 20,000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-03/download"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-03/download"}],"useCases":["Downloading archived backup data for March 2025","Programmatic retrieval of stored data snapshots","Agent-driven data acquisition with per-request crypto payment"],"bestFor":["Agents needing one-off backup file downloads without API key registration","Developers who want to pay per request with USDC on Base","Automated workflows requiring archived data retrieval"],"notFor":["Users needing detailed documentation or schema guarantees before calling","Bulk or streaming data access where per-request pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.51Z"},"updatedAt":"2026-04-22T13:32:03.115Z"}}