{"id":"b9eceb4a-9cfc-4d0f-b921-fa949e07f219","shortId":"7MFVKp","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" to a backup resource dated 2025-08, gated behind the x402 payment protocol. The endpoint returns a 402 challenge requiring payment of up to 20,000 base units of USDC (0x8335…2913 on Base network), which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain via the Base L2 network using the \"exact\" scheme.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data/analytics (metrics, reports, data export, insights), AI/ML (sentiment analysis, text summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and instant access.\n\nThe specific endpoint being listed (`/api/v1/backups/2025-08`) appears to serve backup data for August 2025. No OpenAPI schema, detailed documentation, or example responses are available — the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt. The endpoint is confirmed live via its 402 challenge, but the actual payload structure and content remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","backup-data","no-api-key","json-response"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — actual request/response format is unknown","Docs, pricing, and README pages all render only a 'Connect wallet' prompt with no substantive content","The specific purpose and contents of the /api/v1/backups/2025-08 resource are undocumented","The broader platform lists many endpoints but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-08","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/2025-08","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via its 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response bodies, and the purpose of the 'backups/2025-08' resource is unexplained. This is effectively a stub 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'/api/v1/backups/2025-08':157 '0.02':9,22,72,139 '000':60 '0x8335':65 '20':59 '2025':40,165 '2913':66 '402':52,197 '6':77 'Base network API' 'USDC micropayment API' 'access':34,151 'actual':201 'advertis':98 'ai/ml':113 'analysi':115 'api':33,105,144 'appear':158 'august':164 'avail':175 'backup':37,161 'backup API' 'backup-data' 'backup/data':4,17 'base':7,20,61,68,87 'behind':43 'broader':95 'chain':84 'challeng':53,198 'classif':118 'confirm':193 'connect':187 'content':205 'convers':134 'data':110,162 'data backup endpoint' 'data/analytics':107 'date':39 'decim':78 'detail':169 'doc':177 'document':170 'embed':119 'endpoint':5,18,28,49,154,191 'equal':71 'estim':128 'exact':92 'exampl':172 'exchang':123 'export':111 'feed':122 'finance/web3':120 'gas':127 'gate':3,16,42,104 'generat':135 'geocod':132 'infrastructur':130 'insight':112 'instant':150 'json-response' 'key':145 'l2':88 'limit':148 'list':156 'live':194 'lowpaymentfee' 'lowpaymentfee.com':30,96 'metric':108 'minim':186 'network':69,89 'no-api-key' 'on-chain':82 'openapi':167 'page':181 'pay':8,21 'pay-per-request API' 'payload':202 'payment':46,55,79 'per':10,23,73,140 'per-request-billing' 'platform':97 'premium':32 'price':121,137,178 'prompt':189 'protocol':47 'provid':31 'quot':126 'rate':124,147 'readm':180 'remain':206 'report':109 'request':11,24,74,141 'requir':54 'resolv':183 'resourc':38 'respons':173 'return':50 'schema':168 'scheme':93 'sentiment':114 'serv':160 'settl':81 'span':106 'specif':153 'structur':203 'suit':100 'summar':117 'text':116 'token':125 'undocu':207 'unit':62 'usdc':13,26,64,75 'usdc-base' 'use':76,90 'util':131 'valid':133 'via':85,195 'wallet':188 'x402':2,15,45,103 'x402 API' 'x402-gated':1,14,102 'x402-payment'","prices":[{"id":"8479478b-0ec8-47f5-8f6a-e623db53df03","listingId":"b9eceb4a-9cfc-4d0f-b921-fa949e07f219","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/2025-08","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:16.130Z"}],"sources":[{"listingId":"b9eceb4a-9cfc-4d0f-b921-fa949e07f219","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-08","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:16.130Z","lastSeenAt":"2026-04-22T13:32:03.125Z"}],"details":{"listingId":"b9eceb4a-9cfc-4d0f-b921-fa949e07f219","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-08 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-08"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-08"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving backup data for August 2025 via a single micropayment","Agent-driven data access without API key registration","Programmatic pay-per-call data retrieval on Base L2"],"bestFor":["Agents or scripts that need on-demand backup data without subscription commitments","Developers exploring x402 payment-gated APIs on Base","Scenarios requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-volume batch retrieval where per-request pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.51Z"},"updatedAt":"2026-04-22T13:32:03.125Z"}}