{"id":"3912e94f-20f7-4305-9df5-9c15b73e5d7a","shortId":"XLnqNu","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/5`. 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/5` endpoint accepts POST requests and returns `application/json`. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) using the x402 \"exact\" scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The platform advertises uniform $0.02 pricing across all its endpoints, no API keys, no rate limits, and instant access.\n\nThe endpoint's specific functionality is unclear — the name \"backups/5\" and the generic description \"Premium API Access\" do not reveal what data or service is returned. The crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all rendered only a \"Connect wallet\" prompt with no further content, so no detailed API documentation, request/response schemas, or usage examples are available. The endpoint is confirmed live (returns a valid x402 402 challenge), but the lack of documentation about what this particular endpoint actually does is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium API access","x402 backup endpoint","lowpaymentfee","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The specific functionality of /api/v1/backups/5 is undocumented — 'Premium API Access' is a generic label applied across the platform.","All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' prompt with no usable content.","No request body schema or response schema is available; integration requires trial-and-error or out-of-band information."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/5","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/5","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 ($0.02 USDC on Base). However, there is no documentation about what the /api/v1/backups/5 endpoint actually returns, no request/response schema, and all doc pages render only a wallet-connect prompt. The purpose of this specific endpoint is essentially 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'/api/v1/backups/5':46,86 '/docs':175 '/pricing':177 '/readme':178 '/request':16,32 '0.02':15,31,123,130 '000':114 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20':113 '402':211 '6':119 'Base network API' 'USDC micropayment API' 'accept':88 'access':41,144,161 'across':132 'actual':223 'advertis':128 'ai/ml':66 'amount':110 'analyt':65 'api':40,61,137,160,193 'application/json':93 'avail':201 'backup':4,20 'backup API' 'backups/5':154 'base':7,23,82,102,115 'base-network' 'broader':52 'call':11,27 'challeng':212 'confirm':205 'connect':183 'content':189 'contract':99 'crawl':172 'data':64,69,166 'decim':120 'descript':158 'detail':192 'document':173,194,217 'dozen':55 'endpoint':5,21,34,62,87,135,146,203,222 'equal':122 'exact':106 'exampl':199 'finance/web3':68 'function':149 'gap':228 'gate':3,19,74 'generic':157 'infer':67 'infrastructur':71 'instant':143 'json-response' 'key':138 'lack':215 'limit':141 'live':206 'lowpaymentfee' 'lowpaymentfee.com':36 'maximum':109 'name':153 'network':83 'offer':54 'page':174 'part':49 'particular':221 'path':45 'pay':9,25,58 'pay-per-cal':8,24 'pay-per-call API' 'pay-per-request':57 'payment':78,94 'per':10,26,59,124 'platform':53,127 'post':89 'post-method' 'premium':39,159 'premium API access' 'price':131 'prompt':185 'protocol':79 'provid':37 'rate':140 'render':180 'request':60,90,125 'request/response':195 'requir':111 'resourc':42 'return':92,170,207 'reveal':164 'schema':196 'scheme':107 'servic':168 'settl':96 'signific':227 'span':63 'specif':85,148 'unclear':151 'uniform':129 'unit':116 'usag':198 'usdc':13,29,98,118 'usdc-settlement' 'use':103 'util':72 'valid':209 'via':75 'wallet':184 'x402':2,18,77,105,210 'x402 backup endpoint' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"43ed6c85-07ab-44e6-ac23-2ef7f0a3bf5f","listingId":"3912e94f-20f7-4305-9df5-9c15b73e5d7a","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:23.926Z"}],"sources":[{"listingId":"3912e94f-20f7-4305-9df5-9c15b73e5d7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:23.926Z","lastSeenAt":"2026-04-22T10:32:34.204Z"}],"details":{"listingId":"3912e94f-20f7-4305-9df5-9c15b73e5d7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/5 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/5"},{"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/5"}],"useCases":["Accessing backup data via a single paid API call","Agent-driven retrieval of backup resources without API key management","Programmatic pay-per-use access to premium data endpoints"],"bestFor":["Agents or services that need keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing","Workflows on Base network that already hold USDC"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-request pricing may add up","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.009Z"},"updatedAt":"2026-04-22T10:32:34.204Z"}}