{"id":"b557fe0d-d685-463d-82fd-9ab666dae165","shortId":"nurbWt","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/44`. 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/44` 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 platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nThe exact functionality of the `/api/v1/backups/44` resource is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without further documentation it is unclear what data or service this particular backup endpoint provides. The platform itself appears live — the root page returns HTTP 200 and the x402 challenge is well-formed — but the lack of endpoint-specific documentation is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium access endpoint","x402 backup","lowpaymentfee","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["The specific functionality of /api/v1/backups/44 is undocumented — 'Premium API Access' is the only label provided.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No request body schema or response schema is available; integration requires trial-and-error or contacting the provider."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/44","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/44","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 ($0.02 USDC on Base). However, there is no documentation explaining what /api/v1/backups/44 actually does, no request/response schema, and no examples. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/request':16,32 '0.02':15,31,114,124 '000':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20':108 '200':201 '6':117 'Base network API' 'USDC micropayment API' 'accept':88 'access':41,157 'across':127 'addit':174 'advertis':121 'ai/ml':66 'amount':106 'analyt':65 'api':40,61,132,156 'appear':194 'application/json':93 'backup':4,20,188 'backup API' 'base':7,23,82,102,110 'beyond':152 'broader':52 'call':11,27 'challeng':205 'commit':140 'connect':169 'content':175 'contract':99 'crawl':159 'data':64,69,183 'decim':118 'doc':160 'document':151,178,217 'dozen':55 'endpoint':5,21,34,62,87,129,189,215 'endpoint-specif':214 'equal':113 'exact':143 'finance/web3':68 'flat':123 'form':209 'function':144 'gap':221 'gate':3,19,74 'http':200 'infer':67 'infrastructur':71 'json-response' 'key':133 'label':154 'lack':212 'limit':136 'live':195 'lowpaymentfee' 'lowpaymentfee.com':36 'maximum':105 'minimum':139 'network':83 'no-api-key' 'offer':54 'page':164,198 'part':49 'particular':187 'path':45 'pay':9,25,58 'pay-per-cal':8,24 'pay-per-call API' 'pay-per-request':57 'payment':78,94 'per':10,26,59,125 'platform':53,120,192 'post':89 'post-method' 'premium':39,155 'premium access endpoint' 'price':161 'prompt':171 'protocol':79 'provid':37,190 'rate':135 'readm':163 'request':60,90,126 'requir':141 'resourc':42,148 'return':92,166,199 'root':197 'servic':185 'settl':96 'signific':220 'span':63 'specif':85,216 'unclear':181 'unit':111 'usdc':13,29,98,115 'usdc-base' 'use':116 'util':72 'via':75 'wallet':170 'well':208 'well-form':207 'without':176 'x402':2,18,77,204 'x402 backup' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"81b01206-4a83-43a7-8f0a-c6719d8615b2","listingId":"b557fe0d-d685-463d-82fd-9ab666dae165","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:29.284Z"}],"sources":[{"listingId":"b557fe0d-d685-463d-82fd-9ab666dae165","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:29.284Z","lastSeenAt":"2026-04-22T09:01:56.194Z"}],"details":{"listingId":"b557fe0d-d685-463d-82fd-9ab666dae165","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/44 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/44"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/44"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a backup resource via a single micropayment without needing an API key or subscription","Programmatic pay-per-request data retrieval settled on Base L2 in USDC","Agent-driven workflows that need on-demand access to gated resources with instant crypto payment"],"bestFor":["Developers or agents who want keyless, pay-as-you-go API access","Use cases requiring low-cost ($0.02) per-call payments on Base","Crypto-native applications that can sign x402 payment headers"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.764Z"},"updatedAt":"2026-04-22T09:01:56.194Z"}}