{"id":"cc48f41a-6081-4fa9-b40c-b6562cff2115","shortId":"4JFw9s","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 `/api/v1/backups/4` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/backups/4` resource is listed under \"Premium API Access\" but its exact functionality is not documented beyond that label — it likely returns some form of backup data or stored resource identified by ID 4.\n\nThe endpoint is live and returns a standard x402 payment challenge. It accepts POST requests and settles payments in USDC on the Base network. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing across all endpoints. Payment is made via the x402 exact scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout window.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/backups/4` endpoint actually returns. The lack of documentation makes it difficult to assess the actual utility of this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-method","backup-retrieval"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium API access","x402 backup","USDC pay-per-call","lowpaymentfee","Base network API","micro-payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The exact purpose and response format of /api/v1/backups/4 is unknown; 'Premium API Access' is the only description","No OpenAPI schema or request/response examples provided","No information on what input the POST body should contain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/4","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/4","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 virtually no documentation — no OpenAPI spec, no request/response examples, and no explanation of what '/api/v1/backups/4' actually returns. The docs pages are empty beyond a wallet connect prompt. Pricing is clear ($0.02/request in USDC on Base) but the endpoint's purpose remains 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'/backups/4':67 '/request':16,32,149 '0.02':15,31,139,148 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '20':129 '300':167 '4':99 '6':135 'Base network API' 'USDC pay-per-call' 'accept':112 'access':74,182 'across':151 'actual':222,234 'address':163 'advertis':173 'ai/ml':59 'amount':126 'analyt':58 'api':55,73,175,189 'assess':232 'backup':4,20,91 'backup API' 'backup-retrieval' 'base':7,23,122,131 'base-network' 'beyond':82 'call':11,27 'challeng':110 'collect':46 'connect':198 'consist':142 'content':204 'data':57,92 'decim':136 'descript':216 'detail':215 'difficult':230 'doc':188 'document':81,183,227 'endpoint':5,21,34,101,153,221,239 'equal':138 'exact':77,160 'exampl':212 'extrem':185 'finance/web3':61 'form':89 'function':78 'gate':3,19 'id':98 'identifi':96 'infer':60 'infrastructur':63 'instant':181 'key':176 'label':84 'lack':225 'like':86 'limit':179 'list':70 'live':103 'lowpaymentfee' 'lowpaymentfee.com':41 'made':156 'make':228 'maximum':125 'micro-payment API' 'network':123 'offer':44 'openapi':208 'page':193 'part':38 'pay':9,25,52 'pay-per-cal':8,24 'pay-per-request':51 'payment':109,117,154 'per':10,26,53,140 'platform':42,145,172 'post':113 'post-method' 'premium':72 'premium API access' 'price':150,190 'prompt':200 'protocol':50 'rate':178 'readm':192 'render':195 'request':54,114,141 'request/response':211 'requir':127 'resourc':68,95 'return':87,105,223 'schema':209 'scheme':161 'second':168 'settl':116 'span':56 'spars':186 'specif':66,238 'standard':107 'store':94 'substant':203 'timeout':169 'uniform':147 'unit':132 'usdc':13,29,119,134 'usdc-settlement' 'util':64,235 'via':157 'wallet':199 'window':170 'x402':2,18,49,108,159 'x402 backup' 'x402-gated':1,17 'x402-payment' 'x402-protocol':48","prices":[{"id":"7b90d112-793c-4d2f-8b45-fe7bfdf85b78","listingId":"cc48f41a-6081-4fa9-b40c-b6562cff2115","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:25.668Z"}],"sources":[{"listingId":"cc48f41a-6081-4fa9-b40c-b6562cff2115","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:25.668Z","lastSeenAt":"2026-04-22T10:32:34.350Z"}],"details":{"listingId":"cc48f41a-6081-4fa9-b40c-b6562cff2115","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/4 \\\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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/4"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/4"},{"claim":"Payment timeout is 300 seconds","source_url":"https://lowpaymentfee.com/api/v1/backups/4"}],"useCases":["Retrieving stored backup data via a single pay-per-request call","Agent-driven data retrieval without API key management","Programmatic access to backup resources settled in USDC on Base"],"bestFor":["Agents or scripts that need keyless, pay-per-call API access","Users who prefer crypto micro-payments over subscription billing","Developers experimenting with x402 protocol integrations"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.917Z"},"updatedAt":"2026-04-22T10:32:34.350Z"}}