{"id":"f6e2fb27-7638-4f1c-9fdc-6b4b94a40245","shortId":"3CxqVV","kind":"x402","title":"x402-gated backup endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated backup endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/9`. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/backups/9` endpoint accepts POST requests and returns `application/json`. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment timeout is 300 seconds. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nThe platform's landing page lists a uniform $0.02/request pricing model across all endpoints with no minimums or commitments. However, the specific functionality of the `/api/v1/backups/9` endpoint is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI spec, no detailed documentation, and the docs/pricing/API pages all render only a \"Connect wallet\" prompt with no additional content. The actual data returned by this backup endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","data backup endpoint","x402 backup","lowpaymentfee","premium API access","USDC pay-per-call","Base network API"],"warnings":["No documentation exists for the /api/v1/backups/9 endpoint — its actual functionality is unknown","No OpenAPI or JSON schema available for request or response payloads","All doc/pricing/API pages render only 'Connect wallet' with no content","The 'backups/9' path suggests a resource ID but no context is given for what backup data is served"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/9","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/9","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 OpenAPI spec, no documentation beyond a generic label, no request/response schema, and no indication of what data the /api/v1/backups/9 endpoint actually returns. The docs, pricing, and API pages are all empty beyond a wallet-connect 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'/request':16,32,151 '0.02':15,31,114,150 '000':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20':108 '300':123 '6':117 'Base network API' 'USDC pay-per-call' 'accept':88 'access':41,133,178 'across':154 'actual':204 'addit':201 'advertis':132 'ai/ml':66 'amount':106 'analyt':65 'api':40,61,126,177 'application/json':93 'backup':4,20,209 'backup API' 'base':7,23,82,102,110 'base-network' 'beyond':173 'broader':52 'call':11,27 'commit':161 'connect':196 'content':202 'contract':99 'data':64,69,205 'data backup endpoint' 'decim':118 'detail':186 'docs/pricing/api':190 'document':172,187 'dozen':55 'endpoint':5,21,34,62,87,156,169,210 'equal':113 'finance/web3':68 'function':165 'gate':3,19,74 'generic':175 'grant':135 'header':141 'howev':162 'infer':67 'infrastructur':71 'json-response' 'key':127 'label':179 'land':145 'limit':130 'list':147 'lowpaymentfee' 'lowpaymentfee.com':36 'maximum':105 'minimum':159 'model':153 'network':83 'offer':54 'openapi':183 'page':146,191 'part':49 'path':45 'pay':9,25,58 'pay-per-cal':8,24 'pay-per-request':57 'payment':78,94,120,140 'per':10,26,59 'platform':53,143 'post':89 'post-method' 'premium':39,176 'premium API access' 'price':152 'prompt':198 'protocol':79 'provid':37 'pure':136 'rate':129 'render':193 'request':60,90 'resourc':42 'return':92,206 'second':124 'settl':96 'span':63 'spec':184 'specif':85,164 'timeout':121 'uniform':149 'unit':111 'unknown':212 'usdc':13,29,98,115 'usdc-settlement' 'use':116 'util':72 'via':75 'wallet':197 'x402':2,18,77,139 'x402 backup' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"ba9eb09d-0fc7-468e-9dd0-d9d373d7131e","listingId":"f6e2fb27-7638-4f1c-9fdc-6b4b94a40245","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:30.443Z"}],"sources":[{"listingId":"f6e2fb27-7638-4f1c-9fdc-6b4b94a40245","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:30.443Z","lastSeenAt":"2026-04-22T09:01:56.236Z"}],"details":{"listingId":"f6e2fb27-7638-4f1c-9fdc-6b4b94a40245","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/9 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02/request pricing, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 USDC base units (=$0.02) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/backups/9"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/9"}],"useCases":["Retrieving backup data via a single pay-per-call transaction","Agent-driven access to backup resources without API key management","Programmatic data retrieval settled in USDC on Base"],"bestFor":["Agents or services that need keyless, pay-per-use API access","Users who prefer crypto micropayments over subscription billing","Workflows requiring on-demand backup data retrieval"],"notFor":["Users who need detailed documentation or schema guarantees before integrating","High-volume batch operations where per-request pricing is inefficient","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.691Z"},"updatedAt":"2026-04-22T09:01:56.236Z"}}