{"id":"8ac21608-b69b-4db9-b88d-6e08b124b0c7","shortId":"7QCKma","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/20`. 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, settled in USDC on the Base network.\n\nThe specific `/api/v1/backups/20` 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 max amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nDocumentation beyond the landing page is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. The exact behavior and response schema of the `/api/v1/backups/20` endpoint are not documented, so the nature of the \"backup\" data it returns is unknown. The endpoint is confirmed live (returns a proper 402 x402 challenge).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","no-api-key"],"categories":["storage","infrastructure"],"synonyms":["backup API","data backup endpoint","x402 backup","lowpaymentfee","USDC micropayment API","pay-per-call API","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The exact purpose and response format of /api/v1/backups/20 is unknown","No OpenAPI spec or output schema provided beyond basic HTTP method info","The 'backups' resource name is ambiguous — unclear what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/20","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of request/response schemas, no examples, and the purpose of the 'backups/20' resource is entirely undocumented. Docs pages return only 'Connect wallet' with no 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'/request':16,32 '0.02':15,31,75,132 '000':121 '0x8335':126 '20':120 '2913':127 '402':213 '6':136 'Base network API' 'USDC micropayment API' 'accept':89 'access':41 'ai/ml':65 'amount':117 'analyt':64 'api':40,60,141,165 'application/json':94 'backup':4,20,199 'backup API' 'base':7,23,83,122,129 'base-network' 'behavior':183 'beyond':156 'broader':52 'call':11,27,151 'caller':102 'challeng':215 'commit':149 'confirm':208 'connect':174 'content':180 'data':63,68,200 'data backup endpoint' 'decim':137 'doc':164 'document':155,193 'dozen':55 'endpoint':5,21,34,61,88,190,206 'equal':131 'exact':182 'extrem':161 'finance/web3':67 'gate':3,19,59 'given':133 'handl':97 'header':109 'includ':104 'independ':153 'infer':66 'infrastructur':70 'json-response' 'key':142 'land':158 'limit':145 'live':209 'lowpaymentfee' 'lowpaymentfee.com':36 'max':116 'must':103 'natur':196 'network':84 'no-api-key' 'offer':54 'page':159,169 'paid':154 'part':49 'path':45 'pay':9,25 'pay-per-cal':8,24 'pay-per-call API' 'pay-per-request' 'payment':95,108,113 'per':10,26,76 'platform':53 'post':90 'post-method' 'premium':39 'price':73,166 'prompt':176 'proof':114 'proper':212 'protocol':101 'provid':37 'rate':144 'readm':168 'render':171 'request':77,91 'requir':118 'resourc':42 'respons':185 'return':93,202,210 'schema':186 'settl':78 'span':62 'spars':162 'specif':86 'subscript':148 'substant':179 'unit':123 'unknown':204 'usdc':13,29,80,125,134 'usdc-settlement' 'util':71 'valid':112 'via':98 'wallet':175 'x':107 'x-payment':106 'x402':2,18,58,100,214 'x402 backup' 'x402-gated':1,17,57 'x402-payment'","prices":[{"id":"cdaea2d3-7a6e-413a-ab0c-c0d976fc5cb5","listingId":"8ac21608-b69b-4db9-b88d-6e08b124b0c7","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:51.625Z"}],"sources":[{"listingId":"8ac21608-b69b-4db9-b88d-6e08b124b0c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:51.625Z","lastSeenAt":"2026-04-22T16:32:26.004Z"}],"details":{"listingId":"8ac21608-b69b-4db9-b88d-6e08b124b0c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/20 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/20"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/20"}],"useCases":["Retrieving backup data via a single micropayment without subscription","Agent-driven data access with per-call USDC settlement on Base","Programmatic access to backup resources with no authentication overhead"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over traditional API subscriptions"],"notFor":["Users needing detailed documentation or guaranteed SLAs","Anyone without USDC on the Base network","High-volume batch operations where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.016Z"},"updatedAt":"2026-04-22T16:32:26.004Z"}}