{"id":"0908ffcb-7055-4011-9161-b3c264884258","shortId":"bqK9n5","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 \"Premium API Access\" for the resource `/api/v1/backups/2025-11`, gated behind the x402 payment protocol. The endpoint is live and returns a standard 402 challenge requesting payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 \"exact\" scheme to the specified wallet address, with a timeout of 300 seconds.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of x402-gated APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific endpoint being listed here (`/api/v1/backups/2025-11`) is not described in the site's public catalog. Its purpose — whether it returns backup data, archived datasets, or something else — is unclear from available material. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for this or any other endpoint on the site.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","backup-data","json-response"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","x402 API","USDC micropayment API","lowpaymentfee","Base network API","pay-per-request API"],"warnings":["The specific endpoint /api/v1/backups/2025-11 is not listed in the site's public API catalog — its purpose is unknown.","No documentation, OpenAPI spec, or request/response examples are available for any endpoint on the site.","All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' prompt with no substantive content.","The nature of the data returned (backups, archives, etc.) is entirely unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-11","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/2025-11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /backups/2025-11 resource is unexplained. All doc pages return only 'Connect wallet' with no 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'/docs':194 '/pricing':195 '/readme':196 '0.02':9,22,80,143 '000':71 '20':70 '300':99 '402':53 '6':76 'Base network API' 'USDC micropayment API' 'access':34,157 'address':94 'advertis':105 'ai/ml':117 'amount':65 'analysi':119 'analyt':116 'api':33,113,150 'archiv':182 'avail':190 'backup':180 'backup API' 'backup-data' 'backup/data':4,17 'base':7,20,61,72 'behind':40 'broader':102 'call':68 'catalog':108,174 'challeng':54 'classif':121 'connect':200 'content':206 'convers':138 'data':115,181 'data backup endpoint' 'dataset':183 'decim':77 'describ':168 'detail':217 'document':192,218 'els':186 'embed':122 'emphas':148 'endpoint':5,18,28,46,161,224 'equal':79 'estim':132 'exact':88 'exampl':214 'exchang':127 'feed':126 'financ':123 'gas':131 'gate':3,16,39,112 'generat':139 'geocod':136 'howev':158 'infrastructur':134 'instant':156 'json-response' 'key':151 'limit':154 'list':163 'live':48 'lowpaymentfee' 'lowpaymentfee.com':30,103 'made':84 'materi':191 'maximum':64 'network':62 'openapi':210 'page':193 'pay':8,21 'pay-per-request API' 'payment':43,56,82 'per':10,23,67,144 'per-request-billing' 'platform':104,147 'premium':32 'price':125,141 'prompt':202 'protocol':44 'provid':31 'public':173 'purpos':176 'quot':130 'rate':128,153 'request':11,24,55,145 'request/response':213 'requir':66 'resourc':37 'return':50,179,197 'schema':211 'scheme':89 'second':100 'sentiment':118 'site':171,227 'someth':185 'span':114 'specif':160 'specifi':92 'standard':52 'substant':205 'summar':120 'timeout':97 'token':129 'unclear':188 'unit':73 'usd':81 'usdc':13,26,58,75 'usdc-base' 'util':135 'valid':137 'via':85 'wallet':93,201 'web3':124 'whether':177 'wide':107 'x402':2,15,42,87,111 'x402 API' 'x402-gated':1,14,110 'x402-payment'","prices":[{"id":"ebaaa96a-8449-419c-ae87-79147089fbdb","listingId":"0908ffcb-7055-4011-9161-b3c264884258","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/2025-11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:14.938Z"}],"sources":[{"listingId":"0908ffcb-7055-4011-9161-b3c264884258","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:14.938Z","lastSeenAt":"2026-04-22T13:32:03.098Z"}],"details":{"listingId":"0908ffcb-7055-4011-9161-b3c264884258","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-11 \\\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 challenge with x402Version 1, requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-11"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-11"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving backup or archived data for November 2025 via a single micropayment","Agent-driven data access without API keys using x402 payment protocol","Programmatic access to premium content gated behind USDC micropayments"],"bestFor":["Agents or scripts that need keyless, pay-per-call data access on Base","Developers experimenting with x402 payment-gated endpoints","Accessing backup/archival data without subscription commitments"],"notFor":["Users who need detailed documentation or schema before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.511Z"},"updatedAt":"2026-04-22T13:32:03.098Z"}}