{"id":"9c7c95cf-d9c6-4686-922e-1c5db9bb9f60","shortId":"jgaMZj","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC with no API keys.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/1`. 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 `/api/v1/backups/1` endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) to the recipient address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys, rate limits, or subscriptions are required — access is purely pay-per-call.\n\nDocumentation on the site is extremely sparse (most pages only show a \"Connect wallet\" prompt), so the exact data returned by this particular backup endpoint is unclear. The platform advertises categories including analytics metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — but the specific behavior of `/api/v1/backups/1` is not documented beyond its title.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","data backup endpoint","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No documentation available for this specific endpoint's request or response format","Site pages beyond the homepage only show 'Connect wallet' with no useful content","The purpose of /api/v1/backups/1 (what 'backup' data it returns) is entirely unclear","No OpenAPI spec or schema provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/1","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request/response schemas, no OpenAPI spec, and the specific purpose of /api/v1/backups/1 is undocumented. Most site pages render only a wallet-connect 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'0.02':9,26,79,127 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '20':120 '6':131 'Base network API' 'USDC micropayment API' 'accept':93 'access':43,149 'address':136 'advertis':185 'ai/ml':69 'analysi':195 'analyt':68,188 'api':16,33,42,65,141 'attach':107 'backup':179 'backup API' 'backup/data':4,21 'base':7,24,87,122,139 'base-network' 'behavior':216 'beyond':222 'broader':54 'call':64,155 'caller':106 'categori':186 'classif':198 'connect':168 'contain':113 'convers':210 'data':67,72,174,191 'data backup endpoint' 'decim':132 'document':156,221 'embed':199 'endpoint':5,22,36,92,180 'estim':207 'exact':173 'exchang':202 'export':192 'extrem':161 'feed':201 'finance/web3':71 'gas':206 'gate':3,20 'generat':212 'geocod':208 'handl':101 'header':112 'i.e':126 'includ':187 'infer':70 'infrastructur':74 'insight':193 'json':98 'json-response' 'key':17,34,142 'limit':144 'lowpaymentfee' 'lowpaymentfee.com':38 'metric':189 'multipl':57 'network':88 'no-api-key' 'offer':56 'page':164 'part':51 'particular':178 'path':47 'pay':8,25,62,153 'pay-per-cal':61,152 'pay-per-call API' 'pay-per-request' 'payment':99,111,116 'per':10,27,63,80,154 'platform':55,184 'post':94 'post-method' 'premium':41 'price':77,200 'prompt':170 'protocol':60,105 'provid':39 'pure':151 'quot':205 'rate':143,203 'recipi':135 'report':190 'request':11,28,81,95 'requir':148 'resourc':44 'return':97,175 'sentiment':194 'settl':82 'show':166 'sign':115 'sinc':128 'site':159 'span':66 'spars':162 'specif':90,215 'subscript':146 'summar':197 'text':196 'titl':224 'token':204 'unclear':182 'unit':123 'usdc':13,30,84,125,129 'usdc-settlement' 'use':130 'util':75 'valid':209 'via':102 'wallet':169 'x':110 'x-payment':109 'x402':2,19,59,104 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':58","prices":[{"id":"9182c166-0deb-4faa-b916-abfb9fc921fe","listingId":"9c7c95cf-d9c6-4686-922e-1c5db9bb9f60","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:52.238Z"}],"sources":[{"listingId":"9c7c95cf-d9c6-4686-922e-1c5db9bb9f60","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:52.238Z","lastSeenAt":"2026-04-22T16:32:26.076Z"}],"details":{"listingId":"9c7c95cf-d9c6-4686-922e-1c5db9bb9f60","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/1"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/1"}],"useCases":["Retrieving backup data with a single micropayment","Agent-driven data access without pre-registration or API keys","Programmatic pay-per-use access to premium resources"],"bestFor":["AI agents needing keyless, instant API access","Developers who prefer pay-per-call over subscriptions","Crypto-native applications on Base network"],"notFor":["Users who need detailed documentation before integrating","High-volume batch operations where per-call pricing is inefficient","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.014Z"},"updatedAt":"2026-04-22T16:32:26.076Z"}}