{"id":"fb10af60-5247-4c7a-aa25-d258681bd5f4","shortId":"VVLvKn","kind":"x402","title":"Download backup data files via x402 micropayment on Base for $0.02 per request.","tagline":"Download backup data files via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to a backup data file (specifically the 2023-01 backup) via an x402 payment challenge. The endpoint accepts POST requests and returns application/json content. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe hosting provider, lowpaymentfee.com, operates a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities. All endpoints share the same $0.02/request pricing model and x402 payment flow on the Base network. The specific endpoint listed here (`/api/v1/backups/2023-01/download`) appears to serve archived backup data from January 2023.\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 documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual content and structure of the backup data it returns is unknown.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","backup-download","pay-per-request","no-api-key","json-response"],"categories":["storage","data"],"synonyms":["backup download API","data export","file download endpoint","x402 backup","paid data download","lowpaymentfee backup","Base USDC API"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no content","The actual content and structure of the backup file is completely undocumented","Purpose and provenance of '2023-01 backup' data is unknown — could be placeholder or demo content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2023-01/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/2023-01/download","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of the backup data is unclear. Effectively a stub 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'/api/v1/backups/2023-01/download':158 '/request':142 '0.02':11,24,72,141 '000':76 '20':75 '2023':40,167 '402':216 '6':80 'Base USDC API' 'accept':50 'access':32 'actual':220 'ai/ml':121 'analysi':124 'analyt':120 'api':83,117,177 'appear':159 'application/json':55 'archiv':162 'attach':92 'avail':207 'backup':2,15,35,42,163,226 'backup download API' 'backup-download' 'base':9,22,62,77,151 'base-network' 'broader':110 'call':116 'caller':90 'challeng':47,217 'classif':126 'coin':67 'confirm':211 'connect':186 'content':56,221 'cost':70 'crypto':130 'data':3,16,36,119,132,164,227 'data export' 'decim':81 'detail':193 'doc':176 'document':168,202 'download':1,14 'embed':127 'endpoint':28,49,137,155,209 'exampl':205 'extrem':173 'file':4,17,37 'file download endpoint' 'financ':128 'flow':148 'header':97 'host':105 'infer':122 'infrastructur':134 'januari':166 'json-response' 'key':84 'limit':87 'list':156 'live':212 'lowpaymentfee backup' 'lowpaymentfee.com':30,107 'market':131 'micropay':7,20 'model':144 'network':63,152 'no-api-key' 'openapi':197 'oper':108 'page':181 'paid data download' 'pay':114 'pay-per-cal':113 'pay-per-request' 'payload':206 'payment':46,57,96,102,147 'per':12,25,73,115 'post':51 'price':143,178 'prompt':188 'proof':103 'proper':215 'provid':31,106 'rate':86 'readm':180 'render':183 'request':13,26,52,74 'request/response':200 'requir':89 'return':54,213,229 'schema':201 'sentiment':123 'serv':161 'settl':59 'share':138 'simpli':91 'site':171 'span':118 'spars':174 'spec':198 'specif':38,154 'structur':223 'suit':111 'summar':125 'technic':192 'unit':78 'unknown':231 'usd':66 'usdc':65 'usdc-settlement' 'use':64 'util':135 'valid':100 'via':5,18,43 'wallet':187 'x':95 'x-payment':94 'x402':6,19,45,101,146 'x402 backup' 'x402-payment'","prices":[{"id":"fce4d0dd-fde3-46ba-86b9-847b834e11f6","listingId":"fb10af60-5247-4c7a-aa25-d258681bd5f4","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/2023-01/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":"2026-04-18T19:29:46.922Z"}],"sources":[{"listingId":"fb10af60-5247-4c7a-aa25-d258681bd5f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2023-01/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:46.922Z","lastSeenAt":"2026-04-22T18:32:49.068Z"}],"details":{"listingId":"fb10af60-5247-4c7a-aa25-d258681bd5f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2023-01/download \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-01/download"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-01/download"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Downloading archived backup data from January 2023 via automated agent","Programmatic retrieval of backup files with per-request micropayment","Integrating backup download into a pipeline that settles payments on Base"],"bestFor":["Agents needing to retrieve specific archived backup data","Workflows requiring keyless, pay-per-use data downloads","Users comfortable with x402 crypto micropayments on Base"],"notFor":["Users who need detailed documentation or schema guarantees before calling","Bulk or free backup retrieval without per-request payment","Non-crypto users who cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.326Z"},"updatedAt":"2026-04-22T18:32:49.068Z"}}