x402-gated backup endpoint on Base, pay $0.02 per request in USDC — no API keys required.
What it does
This endpoint at `/api/v1/backups/28` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific resource at `/backups/28` is labeled "Premium API Access" and accepts POST requests gated by an x402 payment challenge.
The endpoint settles on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with an exact-scheme payment of up to 20,000 base units (USDC has 6 decimals, so this equals $0.02 per request). Payment is made via the `X-PAYMENT` header per the x402 v1 protocol. There are no API keys, no rate limits, and no subscription commitments — callers pay per request.
The broader lowpaymentfee.com platform advertises dozens of endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more, all at the same $0.02/request price point. However, the specific functionality behind `/api/v1/backups/28` is not documented beyond the generic "Premium API Access" label. No OpenAPI schema, request/response examples, or detailed documentation were found for this particular endpoint. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Accessing a backup resource via a single paid POST request
- —Agent-driven retrieval of premium data behind a micropayment wall
- —Programmatic pay-per-use access without managing API keys or subscriptions
Fit
Best for
- —Developers wanting zero-friction pay-per-call API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed documentation or response schemas before integrating
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where per-request pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/28 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and settlement details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/backups/28' is entirely unclear beyond the generic 'Premium API Access' label. The docs pages are empty stubs.
Warnings
- —The specific functionality of /api/v1/backups/28 is undocumented — 'Premium API Access' is the only description available.
- —No OpenAPI spec, request body schema, or response schema found for this endpoint.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.
- —The 'backups' path suggests data retrieval but the actual payload and behavior are unknown.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/backups/28
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/backups/28
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across data/analytics, AI/ML, finance/web3, and infrastructure categorieshttps://lowpaymentfee.com