{"id":"2ff78b1e-b007-4fca-b638-3d7b705c956a","shortId":"PB2RxV","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/2025-12`. It is part of a broader platform offering multiple x402-protocol pay-per-call APIs 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 endpoint probed (`/api/v1/backups/2025-12`) 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 to address 0x1A2B…85F3, with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no explanation of what the `/api/v1/backups/2025-12` resource actually returns. The endpoint name suggests it may deliver a backup or archived dataset for December 2025, but this is speculative. Without documentation or example payloads, integrators will need to experiment after paying to discover the response format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","backup-data"],"categories":["storage","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","backup download API","lowpaymentfee","data export endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No request or response schema provided; payload format is unknown","The resource path '/api/v1/backups/2025-12' is unexplained — unclear what data it returns","This specific endpoint is not listed on the site's landing page among the advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-12","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/2025-12","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 OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no explanation of what the backup resource actually contains. Effectively a stub 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'0.02':9,26,79,124 '000':113 '0x1a2b':140 '0x8335':118 '20':112 '2025':213 '2913':119 '300':144 '402':100 '6':128 '85f3':141 'Base network API' 'USDC micropayment API' 'accept':149 'access':43 'actual':197 'address':139 'ai/ml':69 'analyt':68 'api':15,32,42,65,165 'application/json':154 'archiv':209 'backup':207 'backup download API' 'backup-data' 'backup/data':4,21 'base':7,24,87,114,121 'base-network' 'broader':54 'call':64 'challeng':98,106 'confirm':101 'connect':173 'data':67,72 'data export endpoint' 'dataset':210 'decemb':212 'decim':129 'deliv':205 'detail':180 'discov':231 'doc':163 'document':155,219 'endpoint':5,22,36,91,148,200 'equal':123 'exact':136 'exampl':221 'experi':227 'explan':191 'extrem':160 'finance/web3':71 'format':234 'gate':3,20 'given':125 'http':99 'infer':70 'infrastructur':74 'integr':223 'json-response' 'key':16,33 'live':104 'lowpaymentfee' 'lowpaymentfee.com':38 'made':132 'may':204 'multipl':57 'name':201 'need':17,34,225 'network':88 'no-api-key' 'offer':56 'openapi':184 'page':168 'part':51 'path':47 'pay':8,25,62,229 'pay-per-cal':61 'pay-per-call API' 'pay-per-request' 'payload':222 'payment':108,130 'per':10,27,63,80 'platform':55 'post':150 'premium':41 'price':77,164 'probe':92 'prompt':175 'protocol':60 'provid':39 'readm':167 'render':170 'request':11,28,81,151 'request/response':187 'resourc':44,196 'respons':233 'return':94,153,198 'schema':188 'scheme':137 'second':145 'settl':82 'site':158 'span':66 'spec':185 'specif':90 'specifi':107 'specul':217 'suggest':202 'technic':179 'thin':161 'timeout':146 'unit':115 'usdc':13,30,84,117,126 'usdc-settlement' 'util':75 'valid':96 'via':133 'wallet':174 'without':218 'x402':2,19,59,97,135 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':58","prices":[{"id":"af2de546-0527-4f1d-bbb7-52f1d8052348","listingId":"2ff78b1e-b007-4fca-b638-3d7b705c956a","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/2025-12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:19.759Z"}],"sources":[{"listingId":"2ff78b1e-b007-4fca-b638-3d7b705c956a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:19.759Z","lastSeenAt":"2026-04-22T11:32:36.322Z"}],"details":{"listingId":"2ff78b1e-b007-4fca-b638-3d7b705c956a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-12 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-12"},{"claim":"All listed 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":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-12"}],"useCases":["Retrieving backup or archived data for December 2025 via a single paid request","Programmatic agent-driven data access without API key provisioning","Micropayment-gated data delivery settled on Base L2"],"bestFor":["Agents or scripts that need keyless, pay-as-you-go access to data endpoints","Developers experimenting with x402 protocol integrations","Scenarios requiring on-chain USDC micropayments for API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.26Z"},"updatedAt":"2026-04-22T11:32:36.322Z"}}