{"id":"8c94d695-ecf1-4557-9a85-090211aa868b","shortId":"ahHxuq","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 pay-per-request \"Premium API Access\" resource at the path `/api/v1/backups/8`. It is part of a broader platform offering dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific `/api/v1/backups/8` endpoint accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge advertises a max amount of 20,000 base units of USDC (the asset at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base), which equals $0.02 given USDC's 6 decimals. The payment timeout is 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/backups/8` endpoint actually returns or what input it expects. The endpoint name suggests some kind of backup retrieval, but this is speculative. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","x402 backup","paid API endpoint","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request body or response format for /api/v1/backups/8.","The purpose of the 'backups/8' endpoint is unclear — it may be a demo or placeholder resource.","The broader platform lists many endpoints but none have documented behavior."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/8","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/8","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 zero documentation on what the endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, and all doc pages are empty. The endpoint path '/api/v1/backups/8' is 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'/request':16,32 '0.02':15,31,79,141 '000':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':136 '20':127 '300':151 '6':145 'Base network API' 'USDC micropayment API' 'accept':93 'access':45,164 'actual':204,231 'advertis':122,155 'ai/ml':69 'amount':125 'analyt':68 'api':44,64,157,173 'application/json':98 'asset':134 'awar':228 'backup':4,20,218 'backup API' 'base':7,23,87,129,138 'base-network' 'behind':233 'broader':56 'call':11,27 'caller':106 'challeng':121 'connect':181 'content':187 'data':67,72 'decim':146 'descript':198 'doc':171 'document':166 'dozen':59 'endpoint':5,21,34,65,92,203,212,235 'equal':140 'exampl':195 'expect':210 'extrem':168 'finance/web3':71 'function':232 'gate':3,19,63 'given':142 'handl':101 'header':113 'howev':165 'includ':108 'infer':70 'infrastructur':74 'input':208 'instant':163 'json-response' 'key':158 'kind':216 'limit':161 'lowpaymentfee' 'lowpaymentfee.com':36 'max':124 'must':107 'name':213 'network':88 'offer':58 'openapi':191 'page':176 'paid API endpoint' 'part':53 'path':49 'pay':9,25,40 'pay-per-cal':8,24 'pay-per-request':39 'payment':99,112,117,148 'per':10,26,41,80 'platform':57,154 'post':94 'post-method' 'premium':43 'premium API access' 'price':77,172 'prompt':183 'proof':118 'prospect':224 'protocol':105 'provid':37 'rate':160 'readm':175 'render':178 'request':42,81,95 'request/response':194 'resourc':46 'retriev':219 'return':97,205 'schema':192 'second':152 'settl':82 'span':66 'specif':90 'specul':223 'substant':186 'suggest':214 'thin':169 'timeout':149 'undocu':237 'unit':130 'usdc':13,29,84,132,143 'usdc-settlement' 'user':225 'util':75 'valid':116 'via':102 'wallet':182 'x':111 'x-payment':110 'x402':2,18,62,104,120 'x402 backup' 'x402-gated':1,17,61 'x402-payment'","prices":[{"id":"c05e6dd5-8056-4146-81e2-495f297e0eda","listingId":"8c94d695-ecf1-4557-9a85-090211aa868b","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:32.233Z"}],"sources":[{"listingId":"8c94d695-ecf1-4557-9a85-090211aa868b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:32.233Z","lastSeenAt":"2026-04-22T09:01:56.303Z"}],"details":{"listingId":"8c94d695-ecf1-4557-9a85-090211aa868b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/8 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/8"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/8"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving backup data via a pay-per-call model without API key management","Programmatic access to backup resources settled in USDC on Base","Agent-driven data retrieval with automatic x402 micropayment"],"bestFor":["Developers wanting keyless, pay-per-use API access on Base","AI agents that can handle x402 payment flows natively","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing detailed API documentation or request/response schemas before integrating","Use cases requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.594Z"},"updatedAt":"2026-04-22T09:01:56.303Z"}}