{"id":"c491743a-52c7-413f-a1f7-39b167ead695","shortId":"hEWuFq","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/2026-11`. It is part of a broader platform offering dozens of x402-payable API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific `/api/v1/backups/2026-11` path suggests a dated backup or snapshot resource (November 2026). However, no documentation beyond the landing page was retrievable — the docs, pricing, API, and README pages all returned 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 resource actually contains or what POST body it expects.\n\nPayment is handled via the x402 protocol: callers receive a 402 challenge specifying USDC on Base (contract `0x8335…2913`) with a `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). The scheme is \"exact\" with a 300-second timeout. No API key or account registration is needed — payment is the only authentication. The endpoint is live and responding to the x402 challenge correctly.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","backup-data","no-api-key","json-response"],"categories":["storage","data"],"synonyms":["backup API","data export","snapshot download","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation available — all doc pages return only a 'Connect wallet' prompt with no content","No OpenAPI or request/response schema provided for this endpoint","The path '/api/v1/backups/2026-11' implies a future-dated resource (November 2026) which is unusual and may be a placeholder","Purpose and contents of the 'backup' resource are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2026-11","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/2026-11","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 what the backup resource contains, what request body is expected, or what the response looks like. All doc/pricing/API pages returned only 'Connect wallet' with no content. No OpenAPI schema or examples are available. The listing is effectively a 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'0.02':9,26,77,179 '0x8335':168 '20000':174 '2026':99 '2913':169 '300':190 '402':161 '6':182 'Base network API' 'USDC micropayment API' 'access':43 'account':197 'actual':143 'ai/ml':67 'analyt':66 'api':15,32,42,62,112,194 'authent':205 'backup':94,141 'backup API' 'backup-data' 'backup/data':4,21 'base':7,24,85,166,175 'beyond':103 'bodi':148 'broader':54 'caller':158 'challeng':162,215 'connect':120 'contain':144 'content':126 'contract':167 'correct':216 'data':65,70 'data export' 'date':93 'decim':183 'descript':137 'doc':110 'document':102 'dozen':57 'endpoint':5,22,36,63,207 'equal':178 'exact':187 'exampl':134 'expect':150 'finance/web3':69 'gate':3,20 'handl':153 'howev':100 'infer':68 'infrastructur':72 'json-response' 'key':16,33,195 'land':105 'live':209 'lowpaymentfee.com':38 'maxamountrequir':172 'need':200 'network':86 'no-api-key' 'novemb':98 'offer':56 'openapi':130 'page':106,115 'part':51 'path':47,90 'pay':8,25 'pay-per-call API' 'pay-per-request' 'payabl':61 'payment':151,201 'per':10,27,78 'platform':55 'post':147 'premium':41 'price':75,111 'prompt':122 'protocol':157 'provid':39 'readm':114 'receiv':159 'registr':198 'request':11,28,79 'request/response':133 'requir':17,34 'resourc':44,97,142 'respond':211 'retriev':108 'return':117 'schema':131 'scheme':185 'second':191 'settl':80 'snapshot':96 'snapshot download' 'span':64 'specif':88 'specifi':163 'substant':125 'suggest':91 'timeout':192 'unit':176 'usdc':13,30,82,164,180 'usdc-base' 'use':181 'util':73 'via':154 'wallet':121 'x402':2,19,60,156,214 'x402 endpoint' 'x402-gated':1,18 'x402-payable':59 'x402-payment'","prices":[{"id":"428499d9-195c-4c93-a15a-649802c236e6","listingId":"c491743a-52c7-413f-a1f7-39b167ead695","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/2026-11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:24.507Z"}],"sources":[{"listingId":"c491743a-52c7-413f-a1f7-39b167ead695","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2026-11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:24.507Z","lastSeenAt":"2026-04-22T10:32:34.216Z"}],"details":{"listingId":"c491743a-52c7-413f-a1f7-39b167ead695","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2026-11 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-11"},{"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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-11"}],"useCases":["Retrieving a dated backup or data snapshot for November 2026","Programmatic access to archived data via micropayment","Agent-driven data retrieval without API key provisioning"],"bestFor":["Agents needing keyless, pay-per-request data access","Developers experimenting with x402 payment flows on Base","Automated workflows that need on-demand backup retrieval"],"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":"2026-02-17T23:13:27.011Z"},"updatedAt":"2026-04-22T10:32:34.216Z"}}