{"id":"01cef7dd-c0f2-493a-a1f3-1453712e2de4","shortId":"YUPeLt","kind":"x402","title":"x402-gated backup endpoint on Base, pay-per-request with USDC at $0.02/call.","tagline":"x402-gated backup endpoint on Base, pay-per-request with USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides a pay-per-call \"Premium API Access\" resource at the path /api/v1/backups/48. It is part of a broader platform that offers 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, settled in USDC on the Base network.\n\nThe specific /api/v1/backups/48 endpoint accepts POST requests and returns application/json. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (the asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which has 6 decimals), equating to $0.02 per call. Payment is made via the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nThe endpoint's specific functionality (\"backups/48\") is not documented beyond the generic label \"Premium API Access.\" The broader site lists categories like metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — but no documentation was retrievable (all doc/pricing/README pages only showed a \"Connect wallet\" prompt). Without further documentation, the exact request body schema and response format for this particular backup endpoint remain unknown.","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","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation available — all doc pages render only a 'Connect wallet' prompt","The specific function of /api/v1/backups/48 is undocumented; 'Premium API Access' is a generic label","No OpenAPI spec or request/response schema provided","No examples of expected input or output format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/48","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/48","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 no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/backups/48 is unclear. All documentation pages returned only a 'Connect wallet' prompt with no usable 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'/call':16,32 '0.02':15,31,80,125 '000':108 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':116 '20':107 '300':138 '6':121 'Base network API' 'USDC micropayment API' 'accept':94 'access':45,149,173 'advertis':103,148 'ai/ml':70 'analysi':183 'analyt':69 'api':44,65,142,172 'application/json':99 'asset':114 'backup':4,20,223 'backup API' 'backups/48':163 'base':7,23,88,109,118 'base-network' 'beyond':167 'bodi':215 'broader':56,175 'call':42,127 'categori':178 'challeng':102 'classif':186 'connect':206 'data':68,73 'decim':122 'doc/pricing/readme':201 'document':166,197,211 'dozen':60 'embed':187 'endpoint':5,21,34,66,93,159,224 'equat':123 'exact':134,213 'exchang':190 'feed':189 'finance/web3':72 'format':219 'function':162 'gate':3,19,64 'generic':169 'geocod':192 'grant':151 'header':157 'infer':71 'infrastructur':75 'json-response' 'key':143 'label':170 'like':179 'limit':146 'list':177 'lowpaymentfee' 'lowpaymentfee.com':36 'made':130 'maxamountrequir':105 'metric':180 'network':89 'offer':59 'page':202 'part':53 'particular':222 'path':49 'pay':9,25,40 'pay-per-cal':39 'pay-per-call API' 'pay-per-request':8,24 'payment':128,156 'per':10,26,41,81,126 'platform':57 'post':95 'post-method' 'premium':43,171 'premium API access' 'price':78,188 'prompt':208 'provid':37 'pure':152 'rate':145,191 'remain':225 'report':181 'request':11,27,82,96,214 'resourc':46 'respons':218 'retriev':199 'return':98 'schema':216 'scheme':135 'second':139 'sentiment':182 'settl':83 'show':204 'site':176 'span':67 'specif':91,161 'summar':185 'text':184 'timeout':140 'unit':110 'unknown':226 'usdc':13,29,85,112 'usdc-settlement' 'util':76 'via':131 'wallet':207 'without':209 'x402':2,18,63,101,133,155 'x402 backup endpoint' 'x402-gated':1,17,62 'x402-payment'","prices":[{"id":"cfd558b7-265f-431c-b627-470608471e11","listingId":"01cef7dd-c0f2-493a-a1f3-1453712e2de4","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:23.917Z"}],"sources":[{"listingId":"01cef7dd-c0f2-493a-a1f3-1453712e2de4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:23.917Z","lastSeenAt":"2026-04-22T10:32:34.179Z"}],"details":{"listingId":"01cef7dd-c0f2-493a-a1f3-1453712e2de4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/48 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/48"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base has 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or creating backup data via a single paid API call","Programmatic access to backup resources without API key management","Agent-driven workflows that need on-demand backup retrieval with crypto micropayments"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can handle x402 payment challenges natively","Users who prefer no-subscription, no-commitment API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring non-crypto payment methods","High-volume batch operations where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.034Z"},"updatedAt":"2026-04-22T10:32:34.179Z"}}