{"id":"0d99749e-5c57-46c8-b8b3-c30e1c84bfb4","shortId":"QmLHcC","kind":"x402","title":"x402-gated backup data endpoint on Base, payable in USDC per request.","tagline":"x402-gated backup data endpoint on Base, payable in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a backup dataset dated 2023-12 via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific resource `/api/v1/backups/2023-12` is described simply as \"Premium API Access\" and returns `application/json`. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through on-chain payment.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no explanation of what the backup data actually contains. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","backup-data","json-response","no-api-key"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","x402 backup","premium data access","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet'","No OpenAPI or request/response schema provided","The nature of the 'backup' data (2023-12) is completely undocumented","Cannot verify what data is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2023-12","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/2023-12","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 challenge, but there is zero documentation on request format, response schema, or what the backup data actually contains. No OpenAPI spec, no examples, and all doc pages render only 'Connect wallet'. This is effectively a stub 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'/api/v1/backups/2023-12':86 '0.02':117 '000':106 '0x8335':111 '20':105 '2023':38 '2913':112 '300':134 '402':205 '6':122 'Base network API' 'USDC micropayment API' 'access':32,93,145 'actual':196 'addit':177 'advertis':100,144 'ai/ml':65 'analyt':64 'api':60,92,138,164 'application/json':96 'backup':4,17,35,194 'backup API' 'backup-data' 'base':8,21,79,107,114 'behind':74 'broader':50 'chain':152 'challeng':99,210 'confirm':201 'connect':172 'contain':197 'cost':103 'data':5,18,63,68,195 'data backup endpoint' 'dataset':36 'date':37 'decim':123 'describ':88 'detail':179 'difficult':218 'doc':162 'document':154,215 'dozen':54 'endpoint':6,19,28,61,199 'equal':116 'exact':130 'expect':229 'explan':190 'extrem':159 'finance/web3':67 'gate':3,16,73 'grant':147 'http':204 'infer':66 'infrastructur':70 'json-response' 'key':139 'know':220 'lack':213 'limit':142 'live':202 'lowpaymentfee' 'lowpaymentfee.com':30 'made':126 'make':216 'maximum':102 'micropay':76 'network':80 'no-api-key' 'offer':53 'on-chain':150 'openapi':183 'page':167 'part':47 'pay':57 'pay-per-request':56 'payabl':9,22 'payload':222 'payment':43,124,153 'per':12,25,58,118 'platform':51 'premium':91 'premium data access' 'price':163 'prompt':174 'protocol':44 'provid':31 'pure':148 'rate':141 'readm':166 'render':169 'request':13,26,59,119 'request/response':186 'resourc':85 'respons':227 'return':95,203 'schema':187 'scheme':131 'second':135 'send':224 'simpli':89 'site':157 'span':62 'spec':184 'specif':84 'technic':178 'thin':160 'timeout':136 'unit':108 'usdc':11,24,82,110,120 'usdc-base' 'use':81,121 'util':71 'valid':208 'via':40,127 'wallet':173 'x402':2,15,42,75,98,129,209 'x402 backup' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"1f703834-8360-41e7-b20f-5e3d126747e0","listingId":"0d99749e-5c57-46c8-b8b3-c30e1c84bfb4","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/2023-12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:45.162Z"}],"sources":[{"listingId":"0d99749e-5c57-46c8-b8b3-c30e1c84bfb4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2023-12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:45.162Z","lastSeenAt":"2026-04-22T18:04:41.428Z"}],"details":{"listingId":"0d99749e-5c57-46c8-b8b3-c30e1c84bfb4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2023-12 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-12"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-12"}],"useCases":["Retrieving archived backup data from December 2023","Programmatic access to historical data snapshots via micropayment","Agent-driven data retrieval without API key management"],"bestFor":["Agents or scripts that need on-demand access to archived data without signup","Users comfortable with x402 USDC payments on Base","Scenarios requiring keyless, pay-per-call data access"],"notFor":["Users who need detailed documentation or schema guarantees before calling","Bulk data retrieval where per-request fees would accumulate significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.394Z"},"updatedAt":"2026-04-22T18:04:41.428Z"}}