{"id":"5bfe2bfc-d117-4ccf-b2b2-ae41ecbfe6a6","shortId":"Wguu7q","kind":"x402","title":"x402-gated backup endpoint on Base, pay-per-request with USDC via the x402 protocol.","tagline":"x402-gated backup endpoint on Base, pay-per-request with USDC via the x402 protocol.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/6`. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/backups/6` accepts POST requests and returns `application/json`. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the \"backups/6\" resource actually returns. The endpoint name suggests it may return some form of backup data, but the exact payload structure and semantics are unknown. Agents should be prepared to handle an opaque JSON response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","no-api-key"],"categories":["storage","infrastructure"],"synonyms":["backup API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","premium API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition for request or response payloads.","The purpose and contents of the 'backups/6' resource are unknown — the name is generic and unexplained.","The endpoint path includes a hardcoded ID ('6'), suggesting it may be one record in a collection, but no context is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/6","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/6","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 402 challenge with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of the 'backups/6' resource is entirely opaque. The broader site's docs pages are empty 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'/api/v1/backups/6':48,92 '/docs':158 '/pricing':160 '/readme':162 '/request':135 '0.02':119,134 '000':108 '0x8335':113 '20':107 '2913':114 '6':124 'Base network API' 'USDC micropayment API' 'accept':93 'access':43 'across':138 'actual':192 'advertis':102 'agent':215 'ai/ml':69 'analyt':68 'api':42,64,143 'application/json':98 'backup':4,21,204 'backup API' 'backups/6':190 'base':7,24,85,109,116 'base-network' 'behind':78 'broader':54 'call':63 'challeng':101 'commit':151 'confirm':131 'connect':168 'content':174 'cost':105 'data':67,72,205 'decim':125 'document':153,183 'dozen':58 'endpoint':5,22,36,65,91,140,195 'equal':118 'exact':208 'exampl':186 'extrem':155 'finance/web3':71 'flat':133 'form':202 'gate':3,20,77 'handl':220 'infer':70 'infrastructur':74 'json':223 'json-response' 'key':144 'land':129 'limit':147 'lowpaymentfee' 'lowpaymentfee.com':38 'maximum':104 'may':199 'minimum':150 'model':137 'name':196 'network':86 'no-api-key' 'offer':57 'opaqu':222 'openapi':178 'page':130,163 'part':51 'path':47 'pay':9,26,61 'pay-per-cal':60 'pay-per-call API' 'pay-per-request':8,25 'payload':209 'payment':81 'per':10,27,62,120 'platform':55,127 'post':94 'post-method' 'premium':41 'premium API access' 'prepar':218 'price':136 'prompt':170 'protocol':17,34,82 'provid':39 'rate':146 'render':165 'request':11,28,95,121 'request/response':181 'requir':152 'resourc':44,191 'respons':224 'return':97,193,200 'schema':182 'semant':212 'span':66 'spars':156 'spec':179 'specif':90 'structur':210 'substant':173 'suggest':197 'unit':110 'unknown':214 'usdc':13,30,88,112,122 'usdc-settlement' 'use':87,123 'util':75 'via':14,31 'wallet':169 'x402':2,16,19,33,80,100 'x402 endpoint' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f91665ba-fa0e-4661-9ab9-022e7e6278eb","listingId":"5bfe2bfc-d117-4ccf-b2b2-ae41ecbfe6a6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:32.848Z"}],"sources":[{"listingId":"5bfe2bfc-d117-4ccf-b2b2-ae41ecbfe6a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:32.848Z","lastSeenAt":"2026-04-22T09:01:56.336Z"}],"details":{"listingId":"5bfe2bfc-d117-4ccf-b2b2-ae41ecbfe6a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/6 \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/6"},{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/6"}],"useCases":["Retrieving backup data via a single paid POST request","Demonstrating x402 payment protocol integration on Base","Agent-driven data retrieval with per-call USDC micropayments"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-per-request API access"],"notFor":["Users needing detailed API documentation or schemas before integration","High-volume batch operations where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.635Z"},"updatedAt":"2026-04-22T09:01:56.336Z"}}