{"id":"4522dfac-cc7b-4733-88e2-01b8149676d9","shortId":"Lx3rvW","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 \"Premium API Access\" via the x402 payment protocol on the Base network. It is one of many endpoints offered by the provider, which spans data & analytics, AI/ML inference, finance/Web3, and infrastructure utility categories—all priced at $0.02 per request settled in USDC (USD Coin) on Base.\n\nThe specific resource `/api/v1/backups/27` appears to be a backup-related data endpoint. The x402 challenge confirms it accepts POST requests, charges a maximum of 20,000 base units of USDC (which equals $0.02 given USDC's 6 decimals), and requires no API keys or rate-limit management. Payment is made inline via the X-PAYMENT header per the x402 protocol.\n\nDocumentation on the site is extremely sparse—most pages only show a \"Connect wallet\" prompt. There is no OpenAPI spec, no detailed schema for request/response bodies, and no explanation of what the `/backups/27` resource actually returns. The provider's landing page confirms the pricing model and lists many endpoints, but individual endpoint documentation is absent.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","no-api-key","pay-per-request","post-method","backup-data"],"categories":["storage","infrastructure"],"synonyms":["backup API","data backup endpoint","x402 paid API","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call backup"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No description of what the /backups/27 resource contains or returns","All documentation pages beyond the landing page only show 'Connect wallet'","Purpose of this specific endpoint is unclear—'Premium API Access' is generic"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/27","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/27","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, no request/response schema, and no explanation of what '/backups/27' actually returns. Effectively a stub 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'/backups/27':181 '0.02':9,26,76,119 '000':112 '20':111 '6':123 'Base network API' 'USDC micropayment API' 'absent':203 'accept':104 'access':42 'actual':183 'ai/ml':66 'analyt':65 'api':16,33,41,128 'appear':90 'backup':95 'backup API' 'backup-data' 'backup-rel':94 'backup/data':4,21 'base':7,24,50,85,113 'base-network' 'bodi':174 'categori':72 'challeng':101 'charg':107 'coin':83 'confirm':102,190 'connect':161 'data':64,97 'data backup endpoint' 'decim':124 'detail':170 'document':149,201 'endpoint':5,22,36,57,98,197,200 'equal':118 'explan':177 'extrem':154 'finance/web3':68 'gate':3,20 'given':120 'header':144 'individu':199 'infer':67 'infrastructur':70 'inlin':138 'key':17,34,129 'land':188 'limit':133 'list':195 'lowpaymentfee' 'lowpaymentfee.com':38 'made':137 'manag':134 'mani':56,196 'maximum':109 'model':193 'network':51 'no-api-key' 'offer':58 'one':54 'openapi':167 'page':157,189 'pay':8,25 'pay-per-call backup' 'pay-per-request' 'payment':46,135,143 'per':10,27,77,145 'post':105 'post-method' 'premium':40 'price':74,192 'prompt':163 'protocol':47,148 'provid':39,61,186 'rate':132 'rate-limit':131 'relat':96 'request':11,28,78,106 'request/response':173 'requir':126 'resourc':88,182 'return':184 'schema':171 'settl':79 'show':159 'site':152 'span':63 'spars':155 'spec':168 'specif':87 'unit':114 'usd':82 'usdc':13,30,81,116,121 'usdc-settlement' 'util':71 'via':43,139 'wallet':162 'x':142 'x-payment':141 'x402':2,19,45,100,147 'x402 paid API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"09fd7ad6-1c15-42d2-a375-6dc70783dc50","listingId":"4522dfac-cc7b-4733-88e2-01b8149676d9","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:22.716Z"}],"sources":[{"listingId":"4522dfac-cc7b-4733-88e2-01b8149676d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:22.716Z","lastSeenAt":"2026-04-22T12:04:54.182Z"}],"details":{"listingId":"4522dfac-cc7b-4733-88e2-01b8149676d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/27 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint charges a maximum of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/backups/27"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving backup data on demand with per-request payment","Programmatic access to stored backup resources without subscription","Agent-driven data retrieval settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use backup data access","AI agents that can settle x402 payments on Base","Users who prefer no-commitment, no-rate-limit API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume batch retrieval where per-request fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.134Z"},"updatedAt":"2026-04-22T12:04:54.182Z"}}