{"id":"23d83dc7-5eb6-4c16-93e6-e734736f13e9","shortId":"bYYyYF","kind":"x402","title":"x402-gated backup endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated backup endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at `/api/v1/backups/28` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific resource at `/backups/28` is labeled \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge.\n\nThe endpoint settles on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with an exact-scheme payment of up to 20,000 base units (USDC has 6 decimals, so this equals $0.02 per request). Payment is made via the `X-PAYMENT` header per the x402 v1 protocol. There are no API keys, no rate limits, and no subscription commitments — callers pay per request.\n\nThe broader lowpaymentfee.com platform advertises dozens of endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more, all at the same $0.02/request price point. However, the specific functionality behind `/api/v1/backups/28` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found for this particular endpoint. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","post-endpoint","no-api-key"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium access endpoint","x402 backup","pay-per-call API","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["The specific functionality of /api/v1/backups/28 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, request body schema, or response schema found for this endpoint.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The 'backups' path suggests data retrieval but the actual payload and behavior are unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/28","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/28","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, confirming pricing and settlement details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/backups/28' is entirely unclear beyond the generic 'Premium API Access' label. The docs pages are empty 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'/backups/28':70 '/request':178 '0.02':9,26,117,177 '000':107 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':96 '20':106 '6':112 'Base network API' 'USDC micropayment API' 'accept':77 'access':75,195 'across':158 'addit':226 'advertis':154 'ai/ml':59 'analysi':162 'analyt':58 'api':15,32,55,74,137,194,215 'backup':4,21 'backup API' 'base':7,24,91,108 'base-network' 'behind':185 'beyond':190 'broader':151 'call':54 'caller':146 'categori':159 'challeng':85 'collect':46 'commit':145 'connect':221 'content':227 'contract':95 'crypto':62 'data':57 'decim':113 'detail':203 'doc':212 'document':189,204 'dozen':155 'embed':165 'endpoint':5,22,36,87,157,210 'equal':116 'estim':169 'exact':100 'exact-schem':99 'exampl':201 'feed':167 'financ':61 'found':206 'function':184 'gas':168 'gate':3,20,80 'generic':192 'geocod':170 'header':128 'howev':181 'infer':60 'key':16,33,138 'label':72,196 'like':160 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':43,152 'made':122 'network':92 'no-api-key' 'openapi':198 'page':216 'part':40 'particular':209 'pay':8,25,52,147 'pay-per-cal':51 'pay-per-call API' 'pay-per-request' 'payment':84,102,120,127 'per':10,27,53,118,129,148 'platform':44,153 'point':180 'post':78 'post-endpoint' 'premium':73,193 'premium access endpoint' 'price':166,179,213 'prompt':223 'protocol':50,133 'rate':140 'request':11,28,79,119,149 'request/response':200 'requir':17,34 'resourc':68 'return':218 'schema':199 'scheme':101 'sentiment':161 'servic':65 'settl':88 'span':56 'specif':67,183 'subscript':144 'summar':164 'text':163 'unit':109 'usdc':13,30,94,110 'usdc-settlement' 'use':93 'util':64 'v1':132 'via':123 'wallet':222 'x':126 'x-payment':125 'x402':2,19,49,83,131 'x402 backup' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"c811ee5d-85e0-420a-8b84-30ee81e74255","listingId":"23d83dc7-5eb6-4c16-93e6-e734736f13e9","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:23.917Z"}],"sources":[{"listingId":"23d83dc7-5eb6-4c16-93e6-e734736f13e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:23.917Z","lastSeenAt":"2026-04-22T10:02:39.090Z"}],"details":{"listingId":"23d83dc7-5eb6-4c16-93e6-e734736f13e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/28 \\\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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/28"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/28"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across data/analytics, AI/ML, finance/web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a backup resource via a single paid POST request","Agent-driven retrieval of premium data behind a micropayment wall","Programmatic pay-per-use access without managing API keys or subscriptions"],"bestFor":["Developers wanting zero-friction pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or response schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.01Z"},"updatedAt":"2026-04-22T10:02:39.090Z"}}