{"id":"17833f7a-8328-4993-bc19-7b86e288b9fa","shortId":"MTfHwx","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 pay-per-request \"Premium API Access\" resource at the path `/api/v1/backups/50`. 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/50` 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 (asset `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`, 6 decimals), which equals $0.02. The payment scheme is \"exact\" with a timeout of 300 seconds, and funds are sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the `/api/v1/backups/50` endpoint actually returns. The endpoint name suggests some kind of backup retrieval, but the actual payload and purpose are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","x402 backup","paid API endpoint","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/backups/50","The purpose and content of the 'backups/50' resource is completely undocumented","No information on what data is returned or what input is expected beyond a POST request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/50","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/50","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, confirming it accepts payments. However, there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what '/api/v1/backups/50' actually does or returns. The docs pages are empty. This is effectively a stub 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'/request':16,32 '0.02':15,31,79,139 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':134 '20':127 '300':149 '6':135 'Base network API' 'USDC API' 'accept':94 'access':45,168 'actual':209,222 'advertis':123,159 'ai/ml':69 'analyt':68 'api':44,64,161,177 'application/json':99 'asset':133 'backup':4,20,218 'backup API' 'base':7,23,88,129 'base-network' 'broader':56 'call':11,27 'caller':107 'challeng':122 'connect':185 'content':191 'data':67,72 'decim':136 'doc':175 'document':170,200 'dozen':59 'endpoint':5,21,34,65,93,208,212 'equal':138 'exact':144 'explan':203 'extrem':172 'finance/web3':71 'fund':152 'gate':3,19,63 'handl':102 'header':114 'howev':169 'includ':109 'infer':70 'infrastructur':74 'instant':167 'json-response' 'key':162 'kind':216 'limit':165 'lowpaymentfee' 'lowpaymentfee.com':36 'maxamountrequir':125 'must':108 'name':213 'network':89 'offer':58 'openapi':195 'page':180 'paid API endpoint' 'part':53 'path':49 'pay':9,25,40 'pay-per-cal':8,24 'pay-per-request':39 'payload':223 'payment':100,113,118,141 'per':10,26,41,80 'platform':57,158 'post':95 'post-method' 'premium':43 'premium API access' 'price':77,176 'prompt':187 'proof':119 'protocol':106 'provid':37 'purpos':225 'rate':164 'readm':179 'render':182 'request':42,81,96 'request/response':198 'resourc':46 'retriev':219 'return':98,210 'schema':199 'scheme':142 'second':150 'sent':154 'settl':83 'span':66 'spars':173 'spec':196 'specif':91 'substant':190 'suggest':214 'timeout':147 'unit':130 'unknown':227 'usdc':13,29,85,132 'usdc-settlement' 'util':75 'valid':117 'via':103 'wallet':186 'x':112 'x-payment':111 'x402':2,18,62,105,121 'x402 backup' 'x402-gated':1,17,61 'x402-payment'","prices":[{"id":"e67e50a0-aad4-40fb-bbe0-814ab3718b7d","listingId":"17833f7a-8328-4993-bc19-7b86e288b9fa","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:31.616Z"}],"sources":[{"listingId":"17833f7a-8328-4993-bc19-7b86e288b9fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:31.616Z","lastSeenAt":"2026-04-22T09:01:56.269Z"}],"details":{"listingId":"17833f7a-8328-4993-bc19-7b86e288b9fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/50 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/50"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/50"}],"useCases":["Retrieving backup data via a pay-per-call model without API key registration","Programmatic access to backup resources settled in USDC on Base","Agent-driven workflows that need on-demand backup retrieval with crypto micropayments"],"bestFor":["Developers wanting keyless, pay-per-use API access settled on Base","AI agents with x402 payment capability needing backup data","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing documented request/response schemas before integration","Use cases requiring free or subscription-based access","Production systems that need SLA guarantees or support documentation"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.638Z"},"updatedAt":"2026-04-22T09:01:56.269Z"}}