{"id":"efe53228-b4f3-4f06-bf5c-5273cb84d011","shortId":"LK4YQd","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay-per-request with USDC at $0.02/call.","tagline":"x402-gated backup/data endpoint on Base, pay-per-request with USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/2025-09`. It is part of a broader platform offering multiple x402-protocol pay-per-request APIs 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 endpoint probed (`/api/v1/backups/2025-09`) returned a valid x402 challenge (HTTP 402) confirming it is live. The challenge specifies payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an `X-PAYMENT` header with a valid payment proof. The timeout for payment settlement is 300 seconds.\n\nDocumentation on the site is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/backups/2025-09` endpoint actually returns. The endpoint path suggests it serves backup data for September 2025, but the exact payload structure is unknown. The platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, but details for each are limited to names and prices on the landing page.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","backup-data","json-response"],"categories":["storage","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","backup download API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The exact data returned by /api/v1/backups/2025-09 is unknown — the endpoint name suggests backup data but no schema is provided","No request body schema documented; unclear what POST body (if any) is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-09","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/2025-09","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of the specific backup endpoint is unclear beyond its URL 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'/call':16,32 '0.02':15,31,77,123 '000':112 '0x8335':117 '20':111 '2025':220 '2913':118 '300':164 '402':99 '6':127 'Base network API' 'USDC micropayment API' 'access':41 'actual':208 'advertis':230 'ai':235 'ai/ml':67 'analyt':66,234 'api':40,63,139,175 'attach':147 'backup':216 'backup download API' 'backup-data' 'backup/data':4,20 'base':7,23,86,113,120 'base-network' 'broader':52 'caller':145 'categori':231 'challeng':97,105 'confirm':100 'connect':184 'content':190 'crypto-paid API' 'data':65,70,217,233 'decim':128 'detail':244 'doc':174 'document':166,199 'endpoint':5,21,34,90,207,211 'equal':122 'exact':135,223 'exampl':202 'extrem':171 'financ':238 'finance/web3':69 'gate':3,19 'given':124 'header':152 'http':98 'includ':232 'infer':68 'infrastructur':72,241 'json-response' 'key':140 'land':255 'learn':237 'limit':143,248 'live':103 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':236 'made':131 'multipl':55 'name':250 'network':87 'no-api-key' 'offer':54 'openapi':194 'page':179,256 'part':49 'path':45,212 'pay':9,25,60 'pay-per-call API' 'pay-per-request':8,24,59 'payload':224 'payment':107,129,151,156,161 'per':10,26,61,78 'platform':53,229 'premium':39 'price':75,176,252 'probe':91 'prompt':186 'proof':157 'protocol':58 'provid':37 'rate':142 'readm':178 'render':181 'request':11,27,62,79 'request/response':197 'requir':144 'resourc':42 'return':93,209 'schema':198 'scheme':136 'second':165 'septemb':219 'serv':215 'settl':81 'settlement':162 'simpli':146 'site':169 'span':64 'spars':172 'spec':195 'specif':89 'specifi':106 'structur':225 'suggest':213 'timeout':159 'unit':114 'unknown':227 'usdc':13,29,83,116,125 'usdc-settlement' 'util':73,242 'valid':95,155 'via':132 'wallet':185 'web3':239 'x':150 'x-payment':149 'x402':2,18,57,96,134 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':56","prices":[{"id":"41a9bd20-c423-455e-a239-b5c97a954977","listingId":"efe53228-b4f3-4f06-bf5c-5273cb84d011","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/2025-09","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:17.343Z"}],"sources":[{"listingId":"efe53228-b4f3-4f06-bf5c-5273cb84d011","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-09","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:17.343Z","lastSeenAt":"2026-04-22T12:04:53.915Z"}],"details":{"listingId":"efe53228-b4f3-4f06-bf5c-5273cb84d011","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-09 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-09"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-09"}],"useCases":["Retrieving backup data for a specific month via a single paid request","Programmatic access to data exports without API key management","Agent-driven data retrieval with automatic crypto micropayments"],"bestFor":["Developers wanting keyless, pay-per-use API access settled on Base","AI agents that can handle x402 payment challenges natively","Users needing backup or archival data with minimal onboarding friction"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring non-crypto payment methods (no fiat option visible)","High-volume batch consumers who need bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.38Z"},"updatedAt":"2026-04-22T12:04:53.915Z"}}