{"id":"2271ea51-abe2-4563-8989-378fc4d8dccb","shortId":"gCJTyq","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/15`. 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 and settled in USDC on the Base network.\n\nThe specific `/api/v1/backups/15` 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 `maxAmountRequired` 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 \"backups/15\" resource actually returns. The endpoint name suggests it may serve a backup or snapshot resource, but this is speculative. Without documentation or sample payloads, integrators will need to experiment to determine the actual data returned.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["storage","infrastructure"],"synonyms":["backup API","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API","premium access endpoint"],"warnings":["No documentation available — all doc/pricing/README pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/backups/15' is unclear; 'Premium API Access' is a generic label applied across many endpoints","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/15","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/15","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 /api/v1/backups/15 resource actually returns. No OpenAPI spec, no request/response examples, and all doc pages render only 'Connect wallet'. The purpose of this specific endpoint is 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'/request':16,32 '0.02':15,31,75,137 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':132 '20':123 '300':147 '6':141 'Base network API' 'USDC micropayment API' 'accept':90 'access':41,160 'actual':200,231 'advertis':119,151 'ai/ml':65 'analyt':64 'api':40,60,153,169 'application/json':95 'asset':130 'backup':4,20,210 'backup API' 'backups/15':198 'base':7,23,84,125,134 'base-network' 'broader':52 'call':11,27 'caller':103 'challeng':118 'connect':177 'content':183 'data':63,68,232 'decim':142 'descript':194 'determin':229 'doc':167 'document':162,219 'dozen':55 'endpoint':5,21,34,61,89,203 'equal':136 'exampl':191 'experi':227 'extrem':164 'finance/web3':67 'gate':3,19,59 'given':138 'handl':98 'header':110 'howev':161 'includ':105 'infer':66 'infrastructur':70 'instant':159 'integr':223 'json-response' 'key':154 'limit':157 'lowpaymentfee' 'lowpaymentfee.com':36 'maxamountrequir':121 'may':207 'must':104 'name':204 'need':225 'network':85 'offer':54 'openapi':187 'page':172 'part':49 'path':45 'pay':9,25 'pay-per-cal':8,24 'pay-per-call API' 'pay-per-request' 'payload':222 'payment':96,109,114,144 'per':10,26,76 'platform':53,150 'post':91 'post-method' 'premium':39 'premium access endpoint' 'price':73,168 'prompt':179 'proof':115 'protocol':102 'provid':37 'rate':156 'readm':171 'render':174 'request':77,92 'request/response':190 'resourc':42,199,213 'return':94,201,233 'sampl':221 'schema':188 'second':148 'serv':208 'settl':79 'snapshot':212 'span':62 'specif':87 'specul':217 'substant':182 'suggest':205 'thin':165 'timeout':145 'unit':126 'usdc':13,29,81,128,139 'usdc-settlement' 'util':71 'valid':113 'via':99 'wallet':178 'without':218 'x':108 'x-payment':107 'x402':2,18,58,101,117 'x402 API' 'x402-gated':1,17,57 'x402-payment'","prices":[{"id":"c35d775f-cd7b-4886-826e-bd12e6617543","listingId":"2271ea51-abe2-4563-8989-378fc4d8dccb","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:54.015Z"}],"sources":[{"listingId":"2271ea51-abe2-4563-8989-378fc4d8dccb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:54.015Z","lastSeenAt":"2026-04-22T15:02:33.729Z"}],"details":{"listingId":"2271ea51-abe2-4563-8989-378fc4d8dccb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/15 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/15"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/15"},{"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 or snapshot data via a single paid API call","Programmatic access to premium resources without API key management","Agent-driven data retrieval with automatic USDC micropayments on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access settled on Base","AI agents with x402 payment capability needing on-demand data","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.89Z"},"updatedAt":"2026-04-22T15:02:33.729Z"}}