{"id":"9a500b37-d450-4eab-8844-971b692364e0","shortId":"4eQbpf","kind":"x402","title":"x402-gated backup endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated backup endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at `/api/v1/backups/39` 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, crypto, and utility services. The specific resource at `/backups/39` is labeled \"Premium API Access\" but its exact functionality is unclear — the provider's landing page does not list a backups category, and no documentation describes what this particular endpoint returns. The crawled docs, pricing, and README pages all rendered only a wallet-connect prompt with no substantive content.\n\nPayment is handled via the x402 protocol on the Base network. The challenge advertises a maximum amount of 20,000 base units of USDC (contract `0x8335…2913`, 6 decimals), which equals $0.02 per request. Settlement is to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts HTTP POST, is discoverable, and returns `application/json`. No API key or account registration is required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nBecause the endpoint path (`/backups/39`) does not match any of the documented API categories on the landing page, and no schema or example response is available, the actual data returned is unknown. Prospective callers should treat this as an opaque JSON resource until the provider publishes documentation or an OpenAPI spec.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","no-api-key","http-post"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium API access","x402 backup","lowpaymentfee backup","pay-per-call backup","USDC API","Base network API"],"warnings":["Endpoint path /api/v1/backups/39 is not listed on the provider's landing page among documented APIs","No documentation, OpenAPI spec, or response schema available — actual returned data is unknown","All doc/pricing/README pages rendered only a wallet-connect prompt with no content","The label 'Premium API Access' is generic and does not describe the endpoint's function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no example request/response, and the /backups/39 path is not listed among the provider's advertised APIs. Effectively a stub 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'/backups/39':72,198 '0.02':9,26,154 '000':142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':161 '0x8335':148 '20':141 '2913':149 '6':150 'Base network API' 'USDC API' 'accept':164 'access':77 'account':176 'actual':221 'address':160 'advertis':136 'ai/ml':61 'amount':139 'analyt':60 'api':15,32,57,76,173,206 'application/json':171 'attach':182 'avail':219 'backup':4,21,93 'backup API' 'base':7,24,132,143 'base-network' 'caller':180,227 'categori':94,207 'challeng':135 'collect':48 'connect':117 'content':122 'contract':147 'crawl':105 'crypto':64 'data':59,222 'decim':151 'describ':98 'discover':168 'doc':106 'document':97,205,240 'endpoint':5,22,36,102,163,196 'equal':153 'exact':80 'exampl':216 'financ':63 'function':81 'gate':3,20 'handl':125 'header':187 'http':165 'http-post' 'infer':62 'json':234 'json-response' 'key':16,33,174 'label':74 'land':87,210 'list':91 'lowpaymentfee backup' 'lowpaymentfee.com':43 'match':201 'maximum':138 'network':133 'no-api-key' 'offer':46 'opaqu':233 'openapi':243 'page':88,110,211 'part':40 'particular':101 'path':197 'pay':8,25,54 'pay-per-call backup' 'pay-per-request':53 'payment':123,186,192 'per':10,27,55,155 'platform':44 'post':166 'premium':75 'premium API access' 'price':107 'prompt':118 'proof':193 'prospect':226 'protocol':52,129 'provid':85,238 'publish':239 'readm':109 'registr':177 'render':112 'request':11,28,56,156 'requir':17,34,179 'resourc':70,235 'respons':217 'return':103,170,223 'schema':214 'servic':67 'settlement':157 'simpli':181 'span':58 'spec':244 'specif':69 'substant':121 'treat':229 'unclear':83 'unit':144 'unknown':225 'usdc':13,30,146 'usdc-settlement' 'util':66 'valid':190 'via':126 'wallet':116 'wallet-connect':115 'x':185 'x-payment':184 'x402':2,19,51,128,191 'x402 backup' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"f2a11de5-002c-47c7-b344-a779721dac15","listingId":"9a500b37-d450-4eab-8844-971b692364e0","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:28.666Z"}],"sources":[{"listingId":"9a500b37-d450-4eab-8844-971b692364e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:28.666Z","lastSeenAt":"2026-04-22T08:31:57.385Z"}],"details":{"listingId":"9a500b37-d450-4eab-8844-971b692364e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/39 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/39"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/backups/39"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /backups/39 path does not appear in the provider's listed API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a specific backup resource (ID 39) via a single paid POST request","Programmatic access to premium data without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid endpoint access on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access settled in USDC on Base","AI agents that can autonomously pay for API calls via x402 protocol","Users who prefer crypto micropayments over traditional subscription billing"],"notFor":["Anyone needing documented, well-specified API contracts — this endpoint lacks public documentation","High-volume batch consumers who need predictable bulk pricing or rate-limit guarantees","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.767Z"},"updatedAt":"2026-04-22T08:31:57.385Z"}}