Download April 2025 backup data via x402 micropayment on Base for $0.02 per request.
What it does
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.
The 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.
Documentation 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.
Capabilities
Use cases
- —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
Fit
Best for
- —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
Not for
- —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
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-04/download \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
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 page.
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
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/backups/2025-04/download
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/backups/2025-04/download