x402-gated backup/data endpoint on Base, pay-per-request with USDC at $0.02/call.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" resource at the path `/api/v1/backups/2025-09`. It is part of a broader platform offering multiple x402-protocol pay-per-request APIs 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 endpoint probed (`/api/v1/backups/2025-09`) returned a valid x402 challenge (HTTP 402) confirming it is live. The challenge specifies payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an `X-PAYMENT` header with a valid payment proof. The timeout for payment settlement is 300 seconds.
Documentation on the site 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 spec, no request/response schema documentation, and no examples of what the `/api/v1/backups/2025-09` endpoint actually returns. The endpoint path suggests it serves backup data for September 2025, but the exact payload structure is unknown. The platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, but details for each are limited to names and prices on the landing page.
Capabilities
Use cases
- —Retrieving backup data for a specific month via a single paid request
- —Programmatic access to data exports without API key management
- —Agent-driven data retrieval with automatic crypto micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-use API access settled on Base
- —AI agents that can handle x402 payment challenges natively
- —Users needing backup or archival data with minimal onboarding friction
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Anyone requiring non-crypto payment methods (no fiat option visible)
- —High-volume batch consumers who need bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-09 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of the specific backup endpoint is unclear beyond its URL path.
Warnings
- —No OpenAPI spec or schema documentation available
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The exact data returned by /api/v1/backups/2025-09 is unknown — the endpoint name suggests backup data but no schema is provided
- —No request body schema documented; unclear what POST body (if any) is expected
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/backups/2025-09
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/backups/2025-09