x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource `/api/v1/backups/31` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD — consistent with the provider's advertised flat pricing of $0.02 per request across all endpoints. No API keys or rate limits are advertised; 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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no description of what the `/api/v1/backups/31` endpoint specifically returns. The endpoint's purpose ("backups" resource #31) is unclear — it could be a data backup retrieval endpoint, but this is speculative. The response MIME type is `application/json`.
Capabilities
Use cases
- —Retrieving backup data via a single paid API call
- —Programmatic access to stored data without subscription or API key management
- —Agent-driven data retrieval with on-chain USDC micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments on Base
- —Users who need one-off data retrieval without committing to a subscription
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume batch operations where $0.02 per request adds up significantly
- —Anyone who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/31 \
-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 zero documentation on what the /api/v1/backups/31 resource actually does, no request/response schemas, and no examples. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
- —No OpenAPI spec or request/response schema provided.
- —The purpose of '/api/v1/backups/31' is unclear — 'backups' resource with numeric ID is not explained anywhere.
- —No examples of request body or response body are available.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/backups/31
- —The provider advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/backups/31