{"id":"35caacde-e2ee-4df4-a4d1-13db89e70726","shortId":"CqKKYM","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/2025-06`. 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/2025-06` path suggests a backup or data-export resource scoped to June 2025. The x402 challenge confirms the endpoint is live, accepting POST requests, and requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the X-PAYMENT header per the x402 protocol (version 1), with a 300-second timeout. No API keys or rate limits are advertised.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the backup endpoint actually returns. The platform lists many other endpoints (sentiment analysis, summarization, geocoding, etc.) but provides no detail on any of them. Prospective users should be aware that the actual functionality behind this endpoint is unverified and undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-backup","json-response","no-api-key"],"categories":["storage","data"],"synonyms":["backup API","data export","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","No OpenAPI or schema definition for request or response payloads.","The actual data returned by /api/v1/backups/2025-06 is unknown and unverifiable.","The platform lists many endpoints but none appear to have public documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-06","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/2025-06","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually returns. No OpenAPI spec, no request/response examples, and all doc pages are empty stubs. The endpoint's purpose ('backups/2025-06') is ambiguous and 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'/api/v1/backups/2025-06':46,87 '/call':16,32 '/docs':170 '/pricing':171 '/readme':174 '0.02':15,31,75,130 '000':119 '0x8335':124 '1':147 '20':118 '2025':100 '2913':125 '300':150 '6':128 'Base network API' 'USDC micropayment API' 'accept':109 'access':41 'actual':204,232 'advertis':160 'ai/ml':65 'analysi':213 'analyt':64 'api':40,60,154 'awar':229 'backup':91,202 'backup API' 'backup/data':4,20 'base':7,23,83,120,127 'behind':234 'beyond':162 'broader':52 'call':132 'challeng':103 'confirm':104 'connect':180 'content':186 'data':63,68,94 'data export' 'data-backup' 'data-export':93 'decim':129 'detail':220 'document':161,195 'dozen':55 'endpoint':5,21,34,61,106,203,211,236 'etc':216 'exact':115 'exampl':198 'export':95 'extrem':167 'finance/web3':67 'function':233 'gate':3,19,59 'geocod':215 'header':141 'infer':66 'infrastructur':70 'json-response' 'june':99 'key':155 'land':164 'limit':158 'list':208 'live':108 'lowpaymentfee' 'lowpaymentfee.com':36 'made':135 'mani':209 'network':84 'no-api-key' 'offer':54 'openapi':190 'page':165,175 'part':49 'path':45,88 'pay':9,25 'pay-per-call API' 'pay-per-request':8,24 'payment':116,133,140 'per':10,26,76,131,142 'platform':53,207 'post':110 'premium':39 'price':73 'prompt':182 'prospect':225 'protocol':145 'provid':37,218 'rate':157 'request':11,27,77,111 'request/response':193 'requir':113 'resourc':42,96 'return':177,205 'schema':194 'scope':97 'second':151 'sentiment':212 'settl':78 'span':62 'spec':191 'specif':86 'substant':185 'suggest':89 'summar':214 'thin':168 'timeout':152 'undocu':240 'unit':121 'unverifi':238 'usdc':13,29,80,123 'usdc-base' 'user':226 'util':71 'version':146 'via':136 'wallet':181 'x':139 'x-payment':138 'x402':2,18,58,102,144 'x402 endpoint' 'x402-gated':1,17,57 'x402-payment'","prices":[{"id":"33ba95ee-813d-45d5-b5eb-d2bc090226f8","listingId":"35caacde-e2ee-4df4-a4d1-13db89e70726","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/2025-06","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:57.629Z"}],"sources":[{"listingId":"35caacde-e2ee-4df4-a4d1-13db89e70726","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-06","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:57.629Z","lastSeenAt":"2026-04-22T15:02:33.916Z"}],"details":{"listingId":"35caacde-e2ee-4df4-a4d1-13db89e70726","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-06 \\\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 challenge requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-06"},{"claim":"All endpoints 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 endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving backup data for June 2025 via a single paid API call","Programmatic data export with per-request USDC micropayments","Agent-driven data retrieval without API key management"],"bestFor":["Developers wanting keyless, pay-per-use data access on Base","AI agents that can settle x402 payments in USDC","Users needing backup/export data without subscription commitments"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.766Z"},"updatedAt":"2026-04-22T15:02:33.916Z"}}