{"id":"92c9e5a6-aa5f-46ba-8320-8a6ea89fa31d","shortId":"ZuS8wT","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/47`. It is part of a broader platform offering dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific `/api/v1/backups/47` endpoint accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (token contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base), which equals $0.02 given USDC's 6 decimals. The payment timeout is 300 seconds.\n\nThe exact functionality behind the \"backups/47\" resource is not documented in the crawled material. The platform's landing page lists categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but does not mention a \"backups\" category. No OpenAPI schema, detailed docs, or example request/response payloads were found — the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. As a result, the actual data returned by this endpoint is unknown and must be treated as opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","x402 backup endpoint","USDC pay-per-call","lowpaymentfee","premium API access","Base network API","402 payment API"],"warnings":["The exact functionality of /api/v1/backups/47 is undocumented — the 'backups' category does not appear on the platform's landing page.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The purpose and data returned by this endpoint are unknown; callers pay before seeing results."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the purpose of the 'backups/47' resource is entirely undocumented. The docs pages returned only 'Connect wallet' with no 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'/request':16,32 '0.02':15,31,75,136 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':131 '20':123 '300':146 '402 payment API' '6':140 'Base network API' 'USDC pay-per-call' 'accept':90 'access':41 'actual':219 'advertis':119 'ai':172 'ai/ml':65 'analyt':64,171 'api':40,60,200 'application/json':95 'backup':4,20,184 'backup API' 'backups/47':153 'base':7,23,84,125,133 'base-network' 'behind':151 'broader':52 'call':11,27 'caller':103 'categori':168,185 'challeng':118 'connect':208 'content':214 'contract':130 'crawl':160 'data':63,68,170,220 'decim':141 'detail':189 'doc':190,198 'document':157 'dozen':55 'endpoint':5,21,34,61,89,224 'equal':135 'exact':149 'exampl':192 'financ':175 'finance/web3':67 'found':196 'function':150 'gate':3,19,59 'given':137 'handl':98 'header':110 'includ':105 'infer':66 'infrastructur':70,178 'json-response' 'land':165 'learn':174 'like':169 'list':167 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':173 'materi':161 'maxamountrequir':121 'mention':182 'must':104,228 'network':85 'offer':54 'opaqu':232 'openapi':187 'page':166,203 'part':49 'path':45 'pay':9,25 'pay-per-cal':8,24 'pay-per-request' 'payload':194 'payment':96,109,114,143 'per':10,26,76 'platform':53,163 'post':91 'post-method' 'premium':39 'premium API access' 'price':73,199 'prompt':210 'proof':115 'protocol':102 'provid':37 'readm':202 'render':205 'request':77,92 'request/response':193 'resourc':42,154 'result':217 'return':94,221 'schema':188 'second':147 'settl':79 'span':62 'specif':87 'substant':213 'timeout':144 'token':129 'treat':230 'unit':126 'unknown':226 'usdc':13,29,81,128,138 'usdc-settlement' 'util':71 'valid':113 'via':99 'wallet':209 'web3':176 'x':108 'x-payment':107 'x402':2,18,58,101,117 'x402 backup endpoint' 'x402-gated':1,17,57 'x402-payment'","prices":[{"id":"bb460ba1-f2f2-467e-836d-9c38edb31bf0","listingId":"92c9e5a6-aa5f-46ba-8320-8a6ea89fa31d","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:26.877Z"}],"sources":[{"listingId":"92c9e5a6-aa5f-46ba-8320-8a6ea89fa31d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:26.877Z","lastSeenAt":"2026-04-22T10:32:34.423Z"}],"details":{"listingId":"92c9e5a6-aa5f-46ba-8320-8a6ea89fa31d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/47 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/47"},{"claim":"The platform lists endpoints at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC token contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/47"},{"claim":"Docs, pricing, API, and README pages rendered only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving backup data (resource ID 47) via a single paid POST request","Agent-driven programmatic access to paid API resources without API keys","Demonstrating x402 micropayment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can autonomously settle USDC micropayments","Use cases requiring keyless, pay-per-call API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk or high-volume backup retrieval where per-call pricing is inefficient","Anyone needing to understand the response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.885Z"},"updatedAt":"2026-04-22T10:32:34.423Z"}}