{"id":"3098a0cb-a13d-4aa9-824d-a2d22efb94d1","shortId":"r972XV","kind":"x402","title":"Download backup data for September 2026 via x402 micropayment on Base network.","tagline":"Download backup data for September 2026 via x402 micropayment on Base network.","description":"This endpoint at lowpaymentfee.com provides a downloadable backup file for the period 2026-09, gated behind an x402 payment challenge. The endpoint accepts POST requests and returns application/json content. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto data, and infrastructure utilities, all priced at $0.02 per request. This specific endpoint appears to serve archived backup data. However, the exact contents of the backup and the schema of the response body are not documented. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional documentation.\n\nBecause there is no OpenAPI spec, no response schema, and no documentation beyond the landing page listing, the actual data returned by this endpoint is unclear. Callers should be prepared for an undocumented JSON response and may need to experiment to understand the payload structure.","tags":[],"capabilities":["x402-payment","usdc-base","backup-download","pay-per-request","no-api-key"],"categories":["storage","data"],"synonyms":["backup download","data export","archive download","x402 backup","lowpaymentfee backup","paid data download","Base USDC API"],"warnings":["No OpenAPI or response schema available — response payload structure is unknown","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no useful content","The nature and contents of the 'backups/2026-09' data are undocumented","Future-dated path segment (2026-09) raises questions about what data is actually served"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2026-09/download","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/2026-09/download","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema, no documentation beyond a landing page, and the purpose of the 'backup' data is unexplained. Docs pages returned only wallet-connect 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'0.02':64,124 '000':68 '20':67 '2026':6,18,37 '6':74 'Base USDC API' 'accept':47 'actual':190 'addit':170 'ai/ml':114 'analyt':113 'api':77,110,157 'appear':130 'application/json':52 'archiv':133 'archive download' 'attach':86 'backup':2,14,32,134,142 'backup download' 'backup-download' 'base':11,23,61,69 'behind':40 'beyond':184 'bodi':149 'broader':103 'call':109 'caller':84,198 'challeng':44 'connect':165 'content':53,139 'crawl':154 'data':3,15,112,117,135,191 'data export' 'decim':75 'doc':155 'document':152,171,183 'download':1,13,31 'endpoint':26,46,129,195 'exact':138 'experi':211 'file':33 'finance/crypto':116 'gate':39 'header':91 'host':101 'howev':136 'infer':115 'infrastructur':119 'json':205 'key':78 'land':186 'limit':81 'list':188 'lowpaymentfee backup' 'lowpaymentfee.com':28,100 'may':208 'micropay':9,21 'need':209 'network':12,24,62 'no-api-key' 'openapi':176 'page':160,187 'paid data download' 'pay':107 'pay-per-cal':106 'pay-per-request' 'payload':215 'payment':43,54,90,96 'per':65,108,125 'period':36 'post':48 'prepar':201 'price':122,156 'prompt':167 'proof':97 'provid':29,99 'rate':80 'readm':159 'request':49,66,126 'requir':83 'respons':148,179,206 'return':51,162,192 'schema':145,180 'septemb':5,17 'serv':132 'settl':56 'simpli':85 'span':111 'spec':177 'specif':128 'structur':216 'suit':104 'unclear':197 'understand':213 'undocu':204 'unit':70 'usdc':58,72 'usdc-base' 'util':120 'valid':94 'via':7,19 'wallet':166 'x':89 'x-payment':88 'x402':8,20,42,95 'x402 backup' 'x402-payment'","prices":[{"id":"e43caf62-64d1-4c59-8047-94013bdfe684","listingId":"3098a0cb-a13d-4aa9-824d-a2d22efb94d1","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/2026-09/download","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:25.078Z"}],"sources":[{"listingId":"3098a0cb-a13d-4aa9-824d-a2d22efb94d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2026-09/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:25.078Z","lastSeenAt":"2026-04-22T10:32:34.272Z"}],"details":{"listingId":"3098a0cb-a13d-4aa9-824d-a2d22efb94d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2026-09/download \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/backups/2026-09/download","method":"POST","headers":{"X-PAYMENT":"<x402_payment_proof>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-09/download"},{"claim":"Price is $0.02 per request across all APIs, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-09/download"},{"claim":"maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-09/download"}],"useCases":["Downloading archived backup data for September 2026","Programmatic retrieval of periodic data snapshots via micropayment","Agent-driven data acquisition without API key registration"],"bestFor":["Agents needing on-demand backup data without subscription commitments","Developers who prefer pay-per-call over API key management","Workflows requiring Base-network USDC settlement"],"notFor":["Users needing well-documented response schemas before integration","High-volume bulk downloads where per-request pricing adds up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.007Z"},"updatedAt":"2026-04-22T10:32:34.272Z"}}