{"id":"18fd0a21-cb1d-449f-9e6d-16756c364bd4","shortId":"v3ngUN","kind":"x402","title":"x402-gated backup data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated backup data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a backup dataset dated 2023-09 via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — all gated behind x402 micropayments on the Base network.\n\nThe specific resource `/api/v1/backups/2023-09` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) using the \"exact\" scheme. The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02 per request. The endpoint returns application/json. No API keys are needed; authentication is handled entirely through the x402 payment header.\n\nThe platform advertises uniform $0.02 pricing across all endpoints, no rate limits, no minimums, and instant access. However, documentation is extremely thin — the docs, pricing, API, 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 captured), 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 API access","lowpaymentfee","Base USDC API","pay-per-call backup"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request body or response format","Purpose and contents of the 'backups/2023-09' resource are undocumented","Cannot verify what data is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2023-09","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/2023-09","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 with clear pricing, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation — every doc page just shows 'Connect wallet'. The purpose of the backup data is entirely 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'/api/v1/backups/2023-09':86 '0.02':10,24,124,149 '000':116 '0x8335':102 '20':115 '2023':40 '2913':103 '402':208 '6':121 'Base USDC API' 'accept':93 'access':34,91,161 'across':151 'actual':201 'advertis':147 'ai/ml':66 'amount':112 'analyt':65 'api':61,90,132,170 'application/json':130 'authent':136 'backup':4,18,37,199 'backup API' 'backup-data' 'base':8,22,81,105,117 'behind':76 'broader':52 'call':60 'captur':210 'challeng':209 'confirm':206 'connect':178 'contain':202 'content':184 'contract':101 'crypto':69 'data':5,19,64,200 'data backup endpoint' 'dataset':38 'date':39 'decim':122 'descript':195 'difficult':218 'doc':168 'document':163,215 'dozen':55 'endpoint':6,20,30,62,128,153,204 'entir':139 'equal':123 'exact':108 'exampl':192 'expect':229 'extrem':165 'financ':68 'gate':3,17,75 'handl':138 'header':144 'howev':162 'infer':67 'infrastructur':70 'instant':160 'json-response' 'key':133 'know':220 'label':88 'lack':213 'limit':156 'live':207 'lowpaymentfee' 'lowpaymentfee.com':32 'make':216 'maximum':111 'micropay':78 'minimum':158 'need':135 'network':82 'no-api-key' 'offer':54 'openapi':188 'page':173 'part':49 'pay':9,23,58 'pay-per-cal':57 'pay-per-call backup' 'pay-per-request' 'payload':222 'payment':45,96,143 'per':11,25,59,125 'platform':53,146 'post':94 'premium':89 'premium API access' 'price':150,169 'prompt':180 'protocol':46 'provid':33 'rate':155 'readm':172 'render':175 'request':12,26,95,126 'request/response':191 'requir':113 'resourc':85 'respons':227 'return':129 'schema':189 'scheme':109 'send':224 'settl':98 'span':63 'specif':84 'substant':183 'thin':166 'uniform':148 'unit':118 'usdc':14,28,100 'usdc-base' 'use':106 'util':71 'via':42 'wallet':179 'x402':2,16,44,77,142 'x402 backup' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"4fe63f98-1573-407d-b18d-959f21b04e82","listingId":"18fd0a21-cb1d-449f-9e6d-16756c364bd4","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/2023-09","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:47.491Z"}],"sources":[{"listingId":"18fd0a21-cb1d-449f-9e6d-16756c364bd4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2023-09","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:47.491Z","lastSeenAt":"2026-04-22T16:32:25.805Z"}],"details":{"listingId":"18fd0a21-cb1d-449f-9e6d-16756c364bd4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2023-09 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-09"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-09"}],"useCases":["Retrieving archived backup data from September 2023","Programmatic access to stored datasets via micropayment","Agent-driven data retrieval without API key management"],"bestFor":["Developers needing on-demand access to backup archives","AI agents that can pay per request via x402 on Base","Users who prefer keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation before integrating","Bulk data retrieval where per-request fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.273Z"},"updatedAt":"2026-04-22T16:32:25.805Z"}}