{"id":"de555130-a8cd-448b-a65c-70880f7167c0","shortId":"9NfgSd","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 2024-11 via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/backups/2024-11` is described only as \"Premium API Access\" and returns `application/json`. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme to a specified wallet address on Base. No API keys or rate limits are advertised; access is granted purely through per-call payment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the backup data actually contains. The endpoint is confirmed live (402 challenge returned), but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","backup-data","json-response","pay-per-request","no-api-key"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","x402 API","USDC micropayment API","Base network API","premium data access","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The nature of the 'backups/2024-11' data is completely undocumented","Cannot verify what data is returned or what request body is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2024-11","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/2024-11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is essentially no documentation: no OpenAPI schema, no request/response examples, and no explanation of what the backup data contains. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/backups/2024-11':87 '0.02':112 '000':107 '20':106 '2024':38 '402':198 '6':119 'Base network API' 'USDC micropayment API' 'access':32,94,144 'actual':191 'address':133 'advertis':143 'ai/ml':65 'analyt':64 'api':61,93,137,159 'application/json':97 'backup':4,17,35,189 'backup API' 'backup-data' 'base':8,21,82,108,135 'base-network' 'behind':74 'broader':50 'call':151 'challeng':100,199 'confirm':196 'connect':168 'contain':192 'content':174 'cost':104 'data':5,18,63,68,190 'data backup endpoint' 'dataset':36 'date':37 'decim':120 'describ':89 'descript':185 'difficult':208 'doc':158 'document':153,205 'endpoint':6,19,28,86,194 'exact':127 'exampl':182 'expect':219 'extrem':155 'finance/web3':67 'gate':3,16,73 'grant':146 'indic':101 'infer':66 'json-response' 'key':138 'know':210 'lack':203 'limit':141 'live':197 'lowpaymentfee' 'lowpaymentfee.com':30 'made':123 'make':206 'maximum':103 'micropay':76 'network':83 'no-api-key' 'offer':53 'openapi':178 'page':163 'part':47 'pay':58 'pay-per-request':57 'payabl':9,22 'payload':212 'payment':43,121,152 'per':12,25,59,114,150 'per-cal':149 'platform':51 'premium':92 'premium data access' 'price':160 'prompt':170 'protocol':44 'provid':31 'pure':147 'rate':140 'readm':162 'render':165 'request':13,26,60,115 'request/response':181 'respons':217 'return':96,200 'schema':179 'scheme':128 'send':214 'servic':71 'settl':77 'sinc':116 'span':62 'spars':156 'specif':85 'specifi':131 'substant':173 'unit':109 'usd':113 'usdc':11,24,79,111,117 'usdc-settlement' 'use':118 'util':70 'varieti':55 'via':40,124 'wallet':132,169 'x402':2,15,42,75,99,126 'x402 API' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"b04999d8-cc2a-4c5c-b1c4-af2d7638d513","listingId":"de555130-a8cd-448b-a65c-70880f7167c0","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/2024-11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:11.895Z"}],"sources":[{"listingId":"de555130-a8cd-448b-a65c-70880f7167c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2024-11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:11.895Z","lastSeenAt":"2026-04-22T13:32:02.929Z"}],"details":{"listingId":"de555130-a8cd-448b-a65c-70880f7167c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2024-11 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2024-11"},{"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 network","source_url":"https://lowpaymentfee.com/api/v1/backups/2024-11"}],"useCases":["Retrieving archived backup data from November 2024","Programmatic access to stored datasets via micropayment","Agent-driven data retrieval without API key management"],"bestFor":["Agents or scripts that need on-demand access to backup data without subscription","Developers experimenting with x402 payment-gated APIs","Use cases requiring keyless, pay-per-call data access on Base"],"notFor":["Users who need detailed documentation or schema before integrating","High-volume bulk data retrieval where per-request pricing adds up","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.662Z"},"updatedAt":"2026-04-22T13:32:02.929Z"}}