{"id":"c784de19-6c89-4b44-a3cb-cf3f0e110b01","shortId":"yEP3MQ","kind":"x402","title":"x402-gated backup endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated backup endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path /api/v1/backups/29. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.\n\nThe specific endpoint /api/v1/backups/29 returns an x402 challenge requesting payment in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The maxAmountRequired is 20000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. The specific functionality of the /api/v1/backups/29 endpoint is unclear; the name suggests it may return or create a backup resource, but no schema, example request, or example response is documented. The endpoint accepts POST requests based on the outputSchema in the x402 challenge. Without further documentation, the exact input/output format remains unknown.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","backup-api","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","x402 backup","pay-per-call API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — /docs, /pricing, /README all show only 'Connect wallet'","The specific purpose and data format of /api/v1/backups/29 is undocumented and unclear","No OpenAPI spec or input/output schema provided beyond the x402 challenge metadata","The endpoint name 'backups/29' suggests a specific resource ID but no context is given for what backup 29 represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/29","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of /api/v1/backups/29 is entirely unclear. The docs/pricing/README pages are all blank beyond a wallet connect 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'/api/v1/backups/29':40,83,179 '/docs':157 '/pricing':159 '/readme':161 '/request':120 '0.02':107,119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':133 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':93 '20000':99 '300':136 '6':104 'Base network API' 'USDC API' 'accept':206 'access':35,150 'across':121 'address':132 'advertis':115,141 'ai/ml':62 'analyt':61 'api':34,58,143 'backup':4,17,192 'backup API' 'backup-api' 'base':7,20,78,95,100,209 'base-network' 'behind':71 'broader':46 'call':57 'challeng':87,216 'connect':167 'consist':110 'content':173 'contract':92 'creat':190 'data':60,65 'decim':105 'document':152,203,219 'endpoint':5,18,28,82,123,180,205 'equal':106 'exact':129,221 'exampl':197,200 'extrem':154 'finance/web3':64 'flat':116 'format':223 'function':176 'gate':3,16,70 'howev':151 'infer':63 'infrastructur':67 'input/output':222 'instant':149 'key':144 'limit':147 'lowpaymentfee' 'lowpaymentfee.com':30,48 'made':126 'maxamountrequir':97 'may':187 'name':184 'network':79 'offer':50 'outputschema':212 'page':162 'part':43 'path':39 'pay':9,22,55 'pay-per-cal':54 'pay-per-call API' 'pay-per-request':8,21 'payment':74,89,124 'per':10,23,56,108 'platform':47,140 'post':207 'post-method' 'premium':33 'premium API access' 'price':117 'prompt':169 'protocol':75 'provid':31 'rate':146 'remain':224 'render':164 'request':11,24,88,109,198,208 'resourc':36,193 'respons':201 'return':84,188 'schema':196 'scheme':130 'second':137 'site':113 'span':59 'specif':81,175 'substant':172 'suggest':185 'thin':155 'timeout':138 'unclear':182 'unit':101 'unknown':225 'usdc':13,26,91 'usdc-payment' 'util':68 'varieti':52 'via':127 'wallet':168 'without':217 'x402':2,15,73,86,215 'x402 backup' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"ce28779c-53f4-48be-a028-e763b37283b7","listingId":"c784de19-6c89-4b44-a3cb-cf3f0e110b01","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:31.671Z"}],"sources":[{"listingId":"c784de19-6c89-4b44-a3cb-cf3f0e110b01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:31.671Z","lastSeenAt":"2026-04-22T09:01:56.290Z"}],"details":{"listingId":"c784de19-6c89-4b44-a3cb-cf3f0e110b01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requires 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/backups/29"},{"claim":"The endpoint accepts POST requests per the outputSchema in the x402 challenge","source_url":"https://lowpaymentfee.com/api/v1/backups/29"}],"useCases":["Programmatic backup retrieval or creation via a single paid API call","Agent-driven workflows that need on-demand backup access without API key management","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base for per-call access","Use cases requiring no-signup, no-API-key access to backup resources"],"notFor":["Users needing well-documented APIs with clear input/output schemas","High-volume backup operations where per-call pricing is impractical","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.635Z"},"updatedAt":"2026-04-22T09:01:56.290Z"}}