{"id":"0bf0e167-c75e-43c2-a5ca-5a4eff584f75","shortId":"KcTmLC","kind":"x402","title":"Download 2023-03 backup data via x402 micropayment on Base for $0.02 per request.","tagline":"Download 2023-03 backup data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to a downloadable backup file (2023-03 period) behind an x402 paywall. The endpoint accepts POST requests and returns application/json content. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a per-request cost of $0.02 (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach a valid X-PAYMENT header to authorize the micropayment.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint (/api/v1/backups/2023-03/download) appears to serve archived backup data from March 2023. The x402 challenge was successfully captured with version 1, confirming the endpoint is live. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing, the actual structure of the backup data returned is unknown. Callers should expect a JSON response based on the declared mimeType but should be prepared for the possibility of a binary payload or download link.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","backup-download","micropayment","no-api-key","post-endpoint"],"categories":["storage","data"],"synonyms":["backup download","data export","archive download","x402 backup","paid data download","Base USDC API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — response structure is unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The nature and contents of the 'backup' data are unspecified; callers cannot verify what they are paying for","No request body schema documented — unclear if POST body parameters are needed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2023-03/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/2023-03/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 zero documentation, no OpenAPI schema, no request/response examples, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The purpose and schema of the backup data are entirely 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'/api/v1/backups/2023-03/download':136 '0.02':12,26,75,130 '000':77 '0x8335':66 '1':154 '20':76 '2023':2,16,40,145 '2913':67 '6':81 'Base USDC API' 'accept':49 'access':34 'actual':204 'advertis':108 'ai/ml':119 'analyt':118 'api':84,115,169 'appear':137 'application/json':54 'archiv':140 'archive download' 'attach':93 'author':101 'backup':4,18,38,141,208 'backup download' 'backup-download' 'base':10,24,61,78,219 'base-network' 'behind':43 'beyond':198 'binari':233 'broader':105 'caller':91,213 'captur':151 'challeng':148 'confirm':155 'connect':178 'content':55 'contract':65 'cost':73 'data':5,19,117,122,142,209 'data export' 'decim':82 'declar':222 'detail':185 'doc':168 'document':160,197 'download':1,15,37,236 'endpoint':30,48,135,157 'exampl':194 'expect':215 'extrem':165 'file':39 'finance/web3':121 'gate':114 'header':99 'infer':120 'infrastructur':124 'json':217 'key':85 'land':200 'limit':88 'link':237 'list':202 'live':159 'lowpaymentfee' 'lowpaymentfee.com':32,106 'march':144 'micropay':8,22,103 'micropayment' 'mimetyp':223 'network':62 'no-api-key' 'openapi':190 'page':173,201 'paid data download' 'payload':234 'payment':56,98 'paywal':46 'per':13,27,71,131 'per-request':70 'period':42 'platform':107 'possibl':230 'post':50 'post-endpoint' 'prepar':227 'price':127,170 'prompt':180 'provid':33 'rate':87 'readm':172 'render':175 'request':14,28,51,72,132 'request/response':193 'requir':90 'respons':218 'return':53,210 'schema':191 'serv':139 'settl':58 'simpli':92 'site':163 'span':116 'specif':134 'structur':205 'success':150 'suit':110 'technic':184 'thin':166 'uniform':128 'unit':79 'unknown':212 'usdc':64 'usdc-settlement' 'use':63 'util':125 'valid':95 'version':153 'via':6,20 'wallet':179 'x':97 'x-payment':96 'x402':7,21,45,113,147 'x402 backup' 'x402-gated':112 'x402-payment'","prices":[{"id":"6dfb469c-17f9-4a2c-9b84-941fb83c7afb","listingId":"0bf0e167-c75e-43c2-a5ca-5a4eff584f75","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/2023-03/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":"2026-04-18T19:29:54.606Z"}],"sources":[{"listingId":"0bf0e167-c75e-43c2-a5ca-5a4eff584f75","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2023-03/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:54.606Z","lastSeenAt":"2026-04-22T15:02:33.763Z"}],"details":{"listingId":"0bf0e167-c75e-43c2-a5ca-5a4eff584f75","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2023-03/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 version 1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-03/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/2023-03/download"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-03/download"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Downloading archived backup data from March 2023 via a single micropayment","Programmatic retrieval of historical data snapshots without subscription or API key","Agent-driven data acquisition using x402 payment protocol on Base"],"bestFor":["Agents needing one-shot access to archived backup data","Developers testing x402 payment flows with a low-cost endpoint","Users who want keyless, pay-per-use data downloads"],"notFor":["Users needing real-time or streaming data access","Anyone requiring detailed API documentation or schema guarantees before calling","Bulk or high-volume backup retrieval where per-request fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.882Z"},"updatedAt":"2026-04-22T15:02:33.763Z"}}