{"id":"89a5571d-5bd2-4932-84c4-d2a0fee7d797","shortId":"2um537","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 lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/36`. It is part of a broader platform offering dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utility categories — all gated via the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/backups/36` endpoint accepts POST requests and returns `application/json` responses. 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 is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The landing page lists many endpoints but provides no request/response schemas, parameter descriptions, or usage examples. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. The exact purpose of the \"backups/36\" resource is unclear — it could be a data backup retrieval endpoint or a placeholder. Without documentation or example payloads, the actual functionality cannot be confirmed beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium API access","x402 endpoint","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","The purpose and expected input/output of /api/v1/backups/36 is completely undocumented","No OpenAPI spec, no request schema, no response schema provided","Cannot verify what data or functionality this endpoint actually delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/36","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/36","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 request/response schema, no examples, and the purpose of '/api/v1/backups/36' is unexplained. Docs pages are empty beyond a wallet-connect 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'0.02':9,26,117 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':103 '20':111 '300':133 '6':120 'Base network API' 'USDC micropayment API' 'accept':90 'access':43,143 'across':65 'actual':216 'addit':188 'address':127 'advertis':142 'ai/ml':68 'amount':109 'analyt':67 'api':15,32,42,63,136,174 'application/json':95 'backup':4,21,204 'backup API' 'backups/36':195 'base':7,24,84,105,113 'base-network' 'beyond':221 'broader':54 'call':62 'cannot':218 'categori':74 'challeng':224 'confirm':220 'connect':183 'content':189 'contract':102 'could':200 'data':66,203 'decim':121 'descript':168 'doc':173 'document':152,211 'dozen':57 'endpoint':5,22,36,64,89,161,206 'equal':116 'exact':191 'exampl':171,213 'extrem':154 'finance/web3':70 'function':217 'gate':3,20,76 'grant':145 'header':151 'infer':69 'infrastructur':72 'json-response' 'key':16,33,137 'land':157 'limit':140 'list':159 'lowpaymentfee' 'lowpaymentfee.com':38 'mani':160 'maximum':108 'metadata':225 'network':85 'no-api-key' 'offer':56 'page':158,178 'paramet':167 'part':51 'path':47 'pay':8,25,60 'pay-per-cal':59 'pay-per-call API' 'pay-per-request' 'payload':214 'payment':80,97,123,150 'per':10,27,61 'placehold':209 'platform':55 'post':91 'post-method' 'premium':41 'premium API access' 'price':175 'prompt':185 'protocol':81 'provid':39,163 'pure':146 'purpos':192 'rate':139 'readm':177 'render':180 'request':11,28,92 'request/response':165 'requir':17,34 'resourc':44,196 'respons':96 'retriev':205 'return':94 'schema':166 'second':134 'sent':125 'settl':99 'spars':155 'specif':87 'timeout':131 'unclear':198 'unit':114 'usag':170 'usdc':13,30,101,118 'usdc-settlement' 'use':119 'util':73 'via':77 'wallet':184 'without':210 'x402':2,19,79,149,223 'x402 endpoint' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"3db0bafc-fd43-4796-8a9a-c24f7b639b80","listingId":"89a5571d-5bd2-4932-84c4-d2a0fee7d797","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:21.543Z"}],"sources":[{"listingId":"89a5571d-5bd2-4932-84c4-d2a0fee7d797","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:21.543Z","lastSeenAt":"2026-04-22T11:32:36.415Z"}],"details":{"listingId":"89a5571d-5bd2-4932-84c4-d2a0fee7d797","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/36 \\\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/36"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/36"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or triggering backup data via a single paid API call","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Programmatic access to backup resources without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto-native micropayments over traditional API key auth"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Anyone requiring non-crypto payment methods","Production workloads that depend on well-documented request/response contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.136Z"},"updatedAt":"2026-04-22T11:32:36.415Z"}}