{"id":"304e3d48-75b3-4e1c-bfc9-3b7c373f674e","shortId":"cEYFBQ","kind":"x402","title":"Download backup data for June 2026 via x402 micropayment on Base network.","tagline":"Download backup data for June 2026 via x402 micropayment on Base network.","description":"This endpoint at lowpaymentfee.com provides access to a downloadable backup file for the period 2026-06, gated behind an x402 payment challenge. The endpoint accepts POST requests and returns application/json content. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units 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 hosting provider, lowpaymentfee.com, operates a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request on the Base network. However, this specific endpoint is narrowly scoped: it serves a backup download for the June 2026 period. The exact contents and schema of the backup payload are not documented in the crawled material.\n\nBecause no OpenAPI spec, request/response examples, or detailed documentation were found (the docs, pricing, and README pages all rendered only a wallet-connect prompt), the precise request body format and response structure remain unknown. Callers should expect a JSON response but will need to experiment or contact the provider for schema details.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","backup-download","pay-per-request","no-api-key"],"categories":["storage","data"],"synonyms":["backup download","data export","file download","x402 backup","paid backup API","Base USDC API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Docs, pricing, and README pages all render only a wallet-connect prompt with no useful content","The specific contents of the '2026-06 backup' are undocumented; purpose is unclear","The backup date (June 2026) is in the future relative to typical expectations, which is unusual"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2026-06/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/2026-06/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 request/response schema, no documentation beyond a wallet-connect stub, and the purpose of the backup is unexplained. This is effectively a stub 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'0.02':71,131 '000':75 '20':74 '2026':6,18,39,153 '6':79 'Base USDC API' 'accept':49 'access':30 'ai/ml':120 'analyt':119 'api':82,116 'application/json':54 'attach':91 'backup':2,14,34,148,162 'backup download' 'backup-download' 'base':11,23,61,76,136 'base-network' 'behind':42 'bodi':199 'broader':109 'call':115 'caller':89,206 'catalog':110 'challeng':46 'coin':66 'connect':194 'contact':218 'content':55,157 'cost':69 'crawl':169 'data':3,15,118,123 'data export' 'decim':80 'detail':178,223 'doc':183 'document':166,179 'download':1,13,33,149 'endpoint':26,48,141 'exact':156 'exampl':176 'expect':208 'experi':216 'file':35 'file download' 'finance/web3':122 'format':200 'found':181 'gate':41 'header':96 'host':104 'howev':138 'infer':121 'infrastructur':125 'json':210 'june':5,17,152 'key':83 'limit':86 'lowpaymentfee' 'lowpaymentfee.com':28,106 'materi':170 'micropay':9,21 'narrowli':143 'need':214 'network':12,24,62,137 'no-api-key' 'openapi':173 'oper':107 'page':187 'paid backup API' 'pay':113 'pay-per-cal':112 'pay-per-request' 'payload':163 'payment':45,56,95,101 'per':72,114,132 'period':38,154 'post':50 'precis':197 'price':128,184 'prompt':195 'proof':102 'provid':29,105,220 'rate':85 'readm':186 'remain':204 'render':189 'request':51,73,133,198 'request/response':175 'requir':88 'respons':202,211 'return':53 'schema':159,222 'scope':144 'serv':146 'settl':58 'simpli':90 'span':117 'spec':174 'specif':140 'structur':203 'uniform':129 'unit':77 'unknown':205 'usd':65 'usdc':64 'usdc-settlement' 'use':63 'util':126 'valid':99 'via':7,19 'wallet':193 'wallet-connect':192 'x':94 'x-payment':93 'x402':8,20,44,100 'x402 backup' 'x402-payment'","prices":[{"id":"a3dff553-b010-4c7a-806d-b0b8e6347711","listingId":"304e3d48-75b3-4e1c-bfc9-3b7c373f674e","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/2026-06/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":"2026-04-18T19:59:16.139Z"}],"sources":[{"listingId":"304e3d48-75b3-4e1c-bfc9-3b7c373f674e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2026-06/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:16.139Z","lastSeenAt":"2026-04-22T13:32:03.151Z"}],"details":{"listingId":"304e3d48-75b3-4e1c-bfc9-3b7c373f674e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2026-06/download \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"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/2026-06/download"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-06/download"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/backups/2026-06/download"}],"useCases":["Downloading periodic backup data for June 2026","Programmatic retrieval of archived datasets behind a micropayment wall","Agent-driven data acquisition with on-chain payment"],"bestFor":["Agents needing to fetch backup/archive data with instant crypto payment","Developers who want keyless, pay-per-use data downloads on Base","Automated pipelines that retrieve periodic data exports"],"notFor":["Users who need detailed documentation or schema guarantees before calling","Bulk or high-volume downloads where per-request pricing adds up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.392Z"},"updatedAt":"2026-04-22T13:32:03.151Z"}}