x402-gated backup endpoint on Base, pay-per-call with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request "Premium API Access" resource at the path /api/v1/backups/37. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific /api/v1/backups/37 endpoint accepts POST requests and returns application/json. Payment is handled via the x402 protocol: callers receive a 402 challenge with payment parameters, pay the required USDC amount on-chain, and include the payment proof in the X-PAYMENT header to access the resource. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the USDC contract used is the canonical Base USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.
The exact nature of the "backups/37" resource is not documented on the site's landing page or docs (the docs, pricing, and API pages all render only a wallet-connect prompt with no further content). The platform advertises no API keys, no rate limits, and instant access. Without additional documentation it is unclear what data or functionality this specific backup endpoint returns.
Capabilities
Use cases
- —Retrieving backup data (backup ID 37) via a single paid API call
- —Integrating pay-per-use backup access into automated agent workflows
- —Demonstrating x402 micropayment protocol usage on Base
Fit
Best for
- —Agents or developers needing on-demand backup retrieval without API key management
- —x402 protocol integrators looking for low-cost endpoints on Base
- —Automated workflows that can settle USDC micropayments per request
Not for
- —Users who need detailed documentation or schema definitions before integrating
- —High-volume bulk backup operations where per-request pricing is inefficient
- —Users without a Base-compatible wallet or USDC balance
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/37
# Returns 402 with x402 challenge. Include X-PAYMENT header with valid payment proof to access.Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/v1/backups/37 actually returns. The docs, pricing, and API pages are all empty beyond a wallet-connect prompt. No OpenAPI schema, no example responses, and no description of the backup resource are available.
Warnings
- —The specific purpose and response format of /api/v1/backups/37 is undocumented — the endpoint name suggests backup data but no details are available.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no substantive content.
- —No OpenAPI spec or response schema is provided for this or any endpoint on the platform.
- —The endpoint path '/api/v1/backups/37' does not appear in the site's listed API catalog, which may indicate it is unlisted or deprecated.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/backups/37
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/backups/37