x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific path `/api/v1/backups/40` suggests a data backup or data retrieval resource. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities.
The endpoint is live and returns a valid x402 challenge. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 USD — consistent with the platform's advertised flat pricing of $0.02 per request. The payment scheme is "exact," meaning each request requires a one-shot micropayment. No API keys, rate limits, or subscriptions are needed; access is instant upon payment.
Documentation is extremely sparse. 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 `/api/v1/backups/40` endpoint actually returns. The `outputSchema` in the x402 challenge only specifies that the input method is HTTP POST and the response MIME type is `application/json`. Without documentation or sample payloads, the exact functionality and data format remain unknown.
Capabilities
Use cases
- —Retrieving backup data or snapshots via a single paid API call
- —Programmatic access to stored data without managing API keys or subscriptions
- —Agent-driven data retrieval with automatic USDC micropayment on Base
Fit
Best for
- —Developers wanting zero-friction, keyless API access with crypto micropayments
- —AI agents that can settle x402 payments autonomously on Base
- —Users who need occasional data retrieval without committing to a subscription
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume batch operations where per-request pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/40 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/backups/40 resource actually provides. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content.
- —The exact purpose and response format of /api/v1/backups/40 is unknown; 'Premium API Access' is generic.
- —No OpenAPI schema or request/response examples are provided by the provider.
- —The '/backups/40' path suggests a specific resource ID; it is unclear what data is returned or whether the resource is static.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/backups/40
- —The platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/backups/40
- —Docs, API, pricing, and README pages show only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs