# Silverback Gas Price API

> Silverback Gas Price API is a paid API for AI agents from silverback-x402.onrender.com, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).

Fetches current gas price data for blockchain transactions, likely on Base or EVM-compatible chains

## Facts

- Endpoint: POST https://silverback-x402.onrender.com/api/v1/gas-price
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/silverback-x402-onrender-com-9f70ce2f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OsW27NJs0N4r5fyBhLHil

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 silverback-x402-onrender-com-9f70ce2f -d '<json body>'
```

Example prompt: What's the current gas price on Base chain right now? I want to know the recommended gwei before I submit a transaction.

## When to prefer this

Use this endpoint when building DeFi agents or transaction workflows on Base chain that need up-to-date gas pricing before submitting swaps, transfers, or contract interactions. Pairs naturally with the sibling token swap and liquidity pool endpoints on silverback-x402.onrender.com.

## Known failure modes

- Network congestion causes stale or delayed gas data
- Upstream node unavailability returns 503 or timeout
- Invalid chain or network parameter returns 400 error
- Render.com cold-start delay causes slow initial response
- Insufficient USDC payment (below $0.005) blocks the request via x402 protocol

## Output

Returns current gas price data for the relevant EVM chain, likely including standard, fast, and/or slow gas price tiers in gwei or wei units suitable for use in transaction construction.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/silverback-x402-onrender-com-9f70ce2f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from silverback-x402.onrender.com](https://www.zero.xyz/host/silverback-x402.onrender.com/llms.txt)