{"id":"2591226d-a472-4bf8-a692-99ebb827b8e1","shortId":"kzSFLt","kind":"x402","title":"Download April 2025 backup data via x402 micropayment on Base for $0.02 per request.","tagline":"Download April 2025 backup data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to a downloadable backup file for April 2025 via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/backups/2025-04/download` accepts POST requests and returns `application/json` content. Payment is handled inline via the x402 protocol: callers include an `X-PAYMENT` header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is individually paid for at the time of the request.\n\nDocumentation on the site is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema`, and no description of what the backup data actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but prospective users should be aware that the nature and format of the backup payload is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","backup-download","per-request-pricing","no-api-key"],"categories":["storage","data"],"synonyms":["backup download API","x402 backup","Base USDC API","lowpaymentfee backup","data export download","micropayment file download"],"warnings":["No documentation available beyond the landing page — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing the backup data format or required request body","The purpose and contents of the 'April 2025 backup' are completely undocumented","No response examples or error handling documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-04/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/2025-04/download","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, no description of what the backup data contains. The listing is largely inferred from the x402 challenge and the site's landing 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'0.02':12,26,68,119 '000':113 '20':112 '2025':3,17,42 '402':205 '6':123 'Base USDC API' 'accept':83 'access':34 'actual':195 'addit':170 'ai/ml':58 'analyt':57 'api':64,126,156 'application/json':88 'april':2,16,41 'awar':212 'backup':4,18,38,193,220 'backup download API' 'backup-download' 'base':10,24,77,114 'beyond':181 'broader':53 'call':136 'caller':98 'challeng':184,206 'commit':132 'confirm':200 'connect':165 'contain':196 'content':89 'data':5,19,56,194 'data export download' 'decim':124 'descript':189 'detail':172 'doc':155 'document':147 'download':1,15,37 'endpoint':30,81,198 'extrem':152 'file':39 'finance/web3':60 'format':217 'handl':92 'header':104 'i.e':118 'includ':99 'individu':138 'infer':59 'infrastructur':62 'inlin':93 'key':127 'limit':129 'live':201 'lowpaymentfee backup' 'lowpaymentfee.com':32 'micropay':8,22 'micropayment file download' 'natur':215 'network':78 'no-api-key' 'offer':55 'openapi':176 'outputschema':186 'page':160 'paid':139 'part':50 'payload':221 'payment':46,90,103,108 'per':13,27,69 'per-request-pricing' 'platform':54 'post':84 'price':66,157 'prompt':167 'proper':204 'prospect':208 'protocol':47,97 'provid':33 'rate':128 'readm':159 'render':162 'request':14,28,70,85,146 'request/response':179 'requir':134 'return':87,202 'schema':180 'settl':72 'sign':107 'sinc':120 'site':150 'spec':177 'specif':80 'technic':171 'thin':153 'time':143 'undocu':223 'unit':115 'upfront':131 'usdc':74,117,121 'usdc-base' 'use':122 'user':209 'util':63 'via':6,20,43,94 'wallet':166 'x':102 'x-payment':101 'x402':7,21,45,96,183 'x402 backup' 'x402-payment'","prices":[{"id":"1bcc74cc-ab48-4ca5-b07a-57906f0569b1","listingId":"2591226d-a472-4bf8-a692-99ebb827b8e1","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/2025-04/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":"2026-04-18T19:29:57.648Z"}],"sources":[{"listingId":"2591226d-a472-4bf8-a692-99ebb827b8e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-04/download","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:57.648Z","lastSeenAt":"2026-04-22T15:02:33.917Z"}],"details":{"listingId":"2591226d-a472-4bf8-a692-99ebb827b8e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-04/download \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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 a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-04/download"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-04/download"}],"useCases":["Downloading monthly backup archives via automated agents paying per request","Integrating pay-per-use data retrieval into pipelines without API key management","Accessing archived data snapshots for April 2025"],"bestFor":["Agents or scripts that need on-demand backup file retrieval with no subscription","Developers exploring x402 micropayment-gated endpoints on Base","Automated workflows that pay per call in USDC"],"notFor":["Users who need detailed documentation or schema guarantees before integrating","Bulk download scenarios where per-request pricing is inefficient","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.766Z"},"updatedAt":"2026-04-22T15:02:33.917Z"}}