# SilverbackDeFi Gas Price API

> SilverbackDeFi Gas Price API is a paid API for AI agents from x402.silverbackdefi.app, paid per call via x402, $0.005/call, status down (last checked 2026-09-14).

Returns current gas price data for blockchain networks to help estimate transaction costs

## Facts

- Endpoint: POST https://x402.silverbackdefi.app/api/v1/gas-price
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-silverbackdefi-app-98d5361f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mKAW0WKdpoxwLtNLjdJdw

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-silverbackdefi-app-98d5361f -d '<json body>'
```

Example prompt: What's the current gas price on Base right now — give me the fast, standard, and slow estimates in gwei so I can decide when to submit my swap.

## When to prefer this

Choose this endpoint when building DeFi agents on Base chain or EVM-compatible networks that need real-time gas price data before executing swaps, transfers, or other on-chain operations. Pairs well with SilverbackDeFi's swap routing and whale monitoring endpoints for a complete DeFi transaction pipeline.

## Known failure modes

- Unsupported network or chain ID returns 400 error
- Service unavailable or upstream RPC node down returns 503
- Payment not processed or insufficient USDC returns 402
- Malformed request body returns 422 validation error
- Rate limit exceeded returns 429

## Output

Returns current gas prices for the requested blockchain network, typically including different speed tiers (slow, standard, fast) expressed in gwei, along with base fee and priority fee breakdowns useful for estimating transaction costs.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-silverbackdefi-app-98d5361f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.silverbackdefi.app](https://www.zero.xyz/host/x402.silverbackdefi.app/llms.txt)