# Multichain RPC Gas Estimate

> Multichain RPC Gas Estimate is a paid API for AI agents from multichain-rpc.clankerceo.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns a gas cost estimate for a simple ETH transfer on a specified EVM chain, including base fee, gas price, and transfer cost in gwei.

## Facts

- Endpoint: GET https://multichain-rpc.clankerceo.workers.dev/gas-estimate
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/multichain-rpc-gas-estimate-0d94771a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_t9c7-z0hxYOE9m90n4HVS

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 multichain-rpc-gas-estimate-0d94771a
```

Example prompt: What's the current gas estimate for a simple transfer on Base right now — give me the base fee, gas price in gwei, and what that simple transfer would actually cost in ETH?

## When to prefer this

Use this endpoint when you need a quick, cheap ($0.001 USDC), on-demand gas estimate for a simple ETH transfer on one of the five major EVM chains (Base, Polygon, Arbitrum, Optimism, Ethereum). It is ideal for agents that need to gate transactions on gas cost, compare fees across chains, or report live gas prices to users — without needing a full RPC node setup or API key.

## Known failure modes

- Unsupported chain name returns an error or empty response
- Missing 'chain' query parameter may return an error or default chain result
- Network latency to the RPC node may cause delayed or stale data
- Chain RPC node downtime may cause 500 or timeout errors

## How this service works

Cheap, factual EVM chain lookups priced per call in USDC. Base, Polygon, Arbitrum, Optimism and Ethereum.

## Output

A JSON object containing the chain name, base fee in gwei (EIP-1559), gas price in gwei, and a simple transfer cost breakdown including gas units (21000), amount in native token, and the token symbol (e.g. ETH).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "enum": [
      "http"
     ],
     "type": "string"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "chain": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "enum": [
      "json"
     ],
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "base_fee_gwei": 0.01,
  "gas_price_gwei": 0.011,
  "simple_transfer_cost": {
   "gas": 21000,
   "amount": "0.0000002",
   "symbol": "ETH"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/multichain-rpc-gas-estimate-0d94771a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from multichain-rpc.clankerceo.workers.dev](https://www.zero.xyz/host/multichain-rpc.clankerceo.workers.dev/llms.txt)