{"id":"67c82216-7153-416a-8e31-2530f5205dd9","shortId":"XJVuTr","kind":"x402","title":"x402-gated backup endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated backup endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/3`. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/backups/3` endpoint accepts POST requests and returns `application/json`. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment timeout is 300 seconds. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nThe platform's landing page lists a uniform $0.02/request pricing model across all endpoints. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual behavior and response schema of the `/api/v1/backups/3` endpoint remain unclear. The endpoint name suggests it retrieves or creates a backup resource, but no schema or example responses are available to confirm this.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","backup-api"],"categories":["storage","infrastructure"],"synonyms":["backup API","data backup endpoint","x402 API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt","The purpose and response schema of /api/v1/backups/3 are unknown; 'Premium API Access' is a generic label used across the platform","No OpenAPI spec or output schema beyond basic HTTP method info","Cannot verify what data the endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/3","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing. However, there is no documentation, no OpenAPI schema, no example request/response, and the purpose of '/api/v1/backups/3' is ambiguous. All doc pages returned only 'Connect wallet' with no 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'/api/v1/backups/3':46,86,183 '/docs':159 '/pricing':160 '/readme':162 '/request':16,32,151 '0.02':15,31,114,150 '000':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20':108 '300':123 '6':117 'Base network API' 'USDC pay-per-call' 'accept':88 'access':41,133 'across':154 'actual':176 'advertis':132 'ai/ml':66 'amount':106 'analyt':65 'api':40,61,126 'application/json':93 'avail':205 'backup':4,20,196 'backup API' 'backup-api' 'base':7,23,82,102,110 'base-network' 'behavior':177 'broader':52 'call':11,27 'confirm':207 'connect':166 'contract':99 'creat':194 'data':64,69 'data backup endpoint' 'decim':118 'detail':173 'document':157 'dozen':55 'endpoint':5,21,34,62,87,156,184,188 'equal':113 'exampl':202 'finance/web3':68 'gate':3,19,74 'grant':135 'header':141 'infer':67 'infrastructur':71 'json-response' 'key':127 'land':145 'limit':130 'list':147 'lowpaymentfee' 'lowpaymentfee.com':36 'maximum':105 'model':153 'name':189 'network':83 'offer':54 'page':146,158 'part':49 'path':45 'pay':9,25,58 'pay-per-cal':8,24 'pay-per-request':57 'payment':78,94,120,140 'per':10,26,59 'platform':53,143 'post':89 'post-method' 'premium':39 'premium API access' 'price':152 'prompt':168 'protocol':79 'provid':37 'pure':136 'rate':129 'remain':185 'request':60,90 'resourc':42,197 'respons':179,203 'retriev':192 'return':92,163 'schema':180,200 'second':124 'settl':96 'span':63 'specif':85 'suggest':190 'technic':172 'timeout':121 'unclear':186 'uniform':149 'unit':111 'usdc':13,29,98,115 'usdc-settlement' 'use':116 'util':72 'via':75 'wallet':167 'x402':2,18,77,139 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"78f59b00-4fac-4c97-8bae-1461a31f651d","listingId":"67c82216-7153-416a-8e31-2530f5205dd9","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:28.051Z"}],"sources":[{"listingId":"67c82216-7153-416a-8e31-2530f5205dd9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:28.051Z","lastSeenAt":"2026-04-22T09:01:56.137Z"}],"details":{"listingId":"67c82216-7153-416a-8e31-2530f5205dd9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/3 \\\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 maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/3"},{"claim":"Platform advertises $0.02/request uniform 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/3"},{"claim":"Documentation pages return only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or creating data backups via a single paid API call","Agent-driven backup workflows that settle payment in USDC on Base","Programmatic access to backup resources without API key management"],"bestFor":["Developers wanting key-less, pay-per-use backup access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume backup operations where per-request pricing may add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.806Z"},"updatedAt":"2026-04-22T09:01:56.137Z"}}