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/50`. It is part of a broader platform offering 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 and settled in USDC on the Base network.
The specific `/api/v1/backups/50` endpoint accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (asset `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`, 6 decimals), which equals $0.02. The payment scheme is "exact" with a timeout of 300 seconds, and funds are sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.
The platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the `/api/v1/backups/50` endpoint actually returns. The endpoint name suggests some kind of backup retrieval, but the actual payload and purpose are unknown.
Capabilities
Use cases
- —Retrieving backup data via a pay-per-call model without API key registration
- —Programmatic access to backup resources settled in USDC on Base
- —Agent-driven workflows that need on-demand backup retrieval with crypto micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-use API access settled on Base
- —AI agents with x402 payment capability needing backup data
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Anyone needing documented request/response schemas before integration
- —Use cases requiring free or subscription-based access
- —Production systems that need SLA guarantees or support documentation
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/50 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming it accepts payments. However, there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what '/api/v1/backups/50' actually does or returns. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema describing request parameters or response format for /api/v1/backups/50
- —The purpose and content of the 'backups/50' resource is completely undocumented
- —No information on what data is returned or what input is expected beyond a POST request
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/backups/50
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/backups/50