Download backup archive for March 2026 via x402 micropayment on Base network.
What it does
This endpoint at lowpaymentfee.com provides access to a downloadable backup file for the period 2026-03, gated behind an x402 payment challenge. The endpoint accepts POST requests and returns application/json content upon successful payment. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via USDC on the Base network.
The x402 challenge specifies a maximum cost of 20,000 base units of USDC (contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's uniform $0.02/request pricing. No API keys or rate limits are required; callers simply attach a valid X-PAYMENT header with a signed payment to the specified payTo address.
Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the backup file actually contains. The endpoint is live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data is delivered after payment.
Capabilities
Use cases
- —Downloading a March 2026 backup archive via automated micropayment
- —Agent-driven retrieval of periodic backup snapshots
- —Programmatic access to archived data without API key management
Fit
Best for
- —Agents that need to fetch backup files with crypto micropayments
- —Workflows requiring keyless, pay-per-use data downloads on Base network
- —Automated systems that settle per-request via x402 USDC
Not for
- —Users who need detailed documentation or schema before purchasing
- —Bulk download scenarios where per-request pricing is inefficient
- —Anyone requiring fiat-only payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/2026-03/download \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The purpose of the 'backup' data is entirely unexplained, making this effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response format.
- —The nature and contents of the 'backup' file for 2026-03 are completely undocumented.
- —The backup date (2026-03) is in the future relative to current knowledge, raising questions about what data this actually serves.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/backups/2026-03/download
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/backups/2026-03/download
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs