{"id":"e8ed74bf-2616-49e8-9fdf-b137cf726dc9","shortId":"XeKfAz","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/backups/40` suggests a data backup or data retrieval resource. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities.\n\nThe endpoint is live and returns a valid x402 challenge. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 USD — consistent with the platform's advertised flat pricing of $0.02 per request. The payment scheme is \"exact,\" meaning each request requires a one-shot micropayment. No API keys, rate limits, or subscriptions are needed; access is instant upon payment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/backups/40` endpoint actually returns. The `outputSchema` in the x402 challenge only specifies that the input method is HTTP POST and the response MIME type is `application/json`. Without documentation or sample payloads, the exact functionality and data format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","json-response","no-api-key","backup-data"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","x402 API","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","premium data access"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content.","The exact purpose and response format of /api/v1/backups/40 is unknown; 'Premium API Access' is generic.","No OpenAPI schema or request/response examples are provided by the provider.","The '/backups/40' path suggests a specific resource ID; it is unclear what data is returned or whether the resource is static."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/40","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/40","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, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/backups/40 resource actually provides. The docs pages are empty. This is effectively a stub 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'/request':16,32 '0.02':15,31,130,141 '000':120 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':111 '20':119 '6':127 'Base network API' 'USDC pay-per-call' 'access':40,167 'actual':210 'advertis':137 'ai':83 'amount':114 'analyt':82 'api':39,79,159,178 'application/json':233 'backup':53 'backup API' 'backup-data' 'backup/data':4,20 'base':7,23,106,121 'base-network' 'broad':72 'call':11,27,117 'catalog':73 'challeng':100,217 'connect':187 'consist':132 'content':193 'contract':110 'data':52,55,81,243 'data backup endpoint' 'decim':128 'descript':204 'doc':177 'document':172,235 'endpoint':5,21,34,63,92,209 'equal':129 'exact':148,240 'exampl':201 'extrem':174 'financ':86 'flat':138 'format':244 'function':241 'gate':3,19 'host':70 'http':225 'infrastructur':89 'input':222 'instant':169 'json-response' 'key':160 'learn':85 'limit':162 'live':94 'lowpaymentfee' 'lowpaymentfee.com':36,67 'machin':84 'mani':62 'maximum':113 'mean':149 'method':223 'micropay':157 'micropayment API' 'mime':230 'need':166 'network':107 'no-api-key' 'offer':64 'one':60,155 'one-shot':154 'openapi':197 'outputschema':213 'page':182 'path':48 'pay':9,25,76 'pay-per-cal':8,24 'pay-per-request':75 'payload':238 'payment':44,101,145,171 'per':10,26,77,116,142 'platform':68,135 'post':226 'premium':38 'premium data access' 'price':139,179 'prompt':189 'protocol':45 'provid':37 'rate':161 'readm':181 'remain':245 'render':184 'request':78,143,151 'request/response':200 'requir':115,152 'resourc':57 'respons':229 'retriev':56 'return':96,211 'sampl':237 'schema':198 'scheme':146 'settl':103 'shot':156 'span':80 'spars':175 'specif':47 'specifi':219 'subscript':164 'suggest':50 'type':231 'unit':122 'unknown':246 'upon':170 'usd':131 'usdc':13,29,109,124 'usdc-micropayment' 'use':108 'util':90 'valid':98 'via':41 'wallet':188 'web3':87 'without':234 'x402':2,18,43,99,216 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"e4ec378f-0ea7-42d1-ad94-e9f5daba4432","listingId":"e8ed74bf-2616-49e8-9fdf-b137cf726dc9","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:26.258Z"}],"sources":[{"listingId":"e8ed74bf-2616-49e8-9fdf-b137cf726dc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:26.258Z","lastSeenAt":"2026-04-22T10:02:39.170Z"}],"details":{"listingId":"e8ed74bf-2616-49e8-9fdf-b137cf726dc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/40 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/40"},{"claim":"The platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and 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/40"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving backup data or snapshots via a single paid API call","Programmatic access to stored data without managing API keys or subscriptions","Agent-driven data retrieval with automatic USDC micropayment on Base"],"bestFor":["Developers wanting zero-friction, keyless API access with crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Users who need occasional data retrieval without committing to a subscription"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch operations where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.885Z"},"updatedAt":"2026-04-22T10:02:39.170Z"}}