# Multi-Chain Gas Tracker — ETH Arb OP Base Polygon BNB Live (`gochujang/multichain-gas-tracker`) Actor

Live gas (gwei) across 10 chains + ETH safe/propose/fast Etherscan oracle. USD cost of sample transfer + swap per chain. Catch cheap-gas windows. No API key. PPE $0.001/chain.

- **URL**: https://apify.com/gochujang/multichain-gas-tracker.md
- **Developed by:** [Hojun Lee](https://apify.com/gochujang) (community)
- **Categories:** Developer tools, Automation, Other
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, NaN bookmarks
- **User rating**: No ratings yet

## Pricing

Pay per usage

This Actor is paid per platform usage. The Actor is free to use, and you only pay for the Apify platform usage, which gets cheaper the higher subscription plan you have.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-usage

## What's an Apify Actor?

Actors are a software tools running on the Apify platform, for all kinds of web data extraction and automation use cases.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

In JavaScript/TypeScript projects, use official [JavaScript/TypeScript client](https://docs.apify.com/api/client/js.md):

```bash
npm install apify-client
```

In Python projects, use official [Python client library](https://docs.apify.com/api/client/python.md):

```bash
pip install apify-client
```

In shell scripts, use [Apify CLI](https://docs.apify.com/cli/docs.md):

````bash
# MacOS / Linux
curl -fsSL https://apify.com/install-cli.sh | bash
# Windows
irm https://apify.com/install-cli.ps1 | iex
```bash

In AI frameworks, you might use the [Apify MCP server](https://docs.apify.com/platform/integrations/mcp.md).

If your project is in a different language, use the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).


# README

## Multi-Chain Gas Price Tracker

> Live gas price (gwei) across **Ethereum, Arbitrum, Optimism, Base, Polygon, BNB, Avalanche, Linea, Scroll, zkSync Era** + Ethereum's full safe/propose/fast oracle bands. USD-converted cost of a sample transfer + swap per chain. Telegram alerts for high or cheap gas windows. No API key required.

---

### What It Does

- For each supported chain, queries a free public JSON-RPC `eth_gasPrice` endpoint
- For **Ethereum mainnet only**, also calls Etherscan's gas oracle for the **safe / propose / fast / suggested base-fee** bands
- Converts each gas price to USD via Coingecko spot for the native token
- Computes USD cost for two reference transactions:
  - Plain transfer (21,000 gas units)
  - Uniswap-style swap (150,000 gas units)

---

### Why This Matters

- **Cost-optimal execution**: which chain is cheapest right now for a stablecoin send? This tells you.
- **Gas timing**: Ethereum gas at 8 gwei = your moment to execute that batch claim / withdraw. At 60 gwei = wait.
- **Cross-chain UX comparison**: when Arbitrum trends to 0.001 gwei and Base to 0.05 gwei, that's a real cost differential for high-frequency users.

---

### Input

| Field | Type | Default | Description |
|-------|------|---------|-------------|
| `chains` | array | all | Subset of supported chains |
| `alertEthGweiAbove` | number | `0` | Telegram alert if ETH ProposeGasPrice ≥ X gwei. 0 = off |
| `alertEthGweiBelow` | number | `0` | Telegram alert if ETH ProposeGasPrice ≤ X gwei ("good time" notification). 0 = off |
| `telegramBotToken` | string (secret) | — | Bot token |
| `telegramChatId` | string | — | Chat ID |

#### Example: ETH cheap-gas notifier
```json
{
  "chains": ["Ethereum"],
  "alertEthGweiBelow": 10,
  "telegramBotToken": "...",
  "telegramChatId": "..."
}
````

#### Example: All-chains snapshot

```json
{}
```

***

### Output

```json
{
  "chain": "Ethereum",
  "chain_id": 1,
  "gas_price_gwei": 8.42,
  "safe_gas_gwei": 8.1,
  "propose_gas_gwei": 8.3,
  "fast_gas_gwei": 8.5,
  "base_fee_gwei": 8.21,
  "native_symbol": "ETH",
  "native_price_usd": 1789.14,
  "transfer_cost_usd": 0.32,
  "swap_cost_usd": 2.26
}
```

L2 rows have null Etherscan oracle fields (Etherscan free tier doesn't cover them) — use `gas_price_gwei` from the public RPC for L2s.

***

### Pricing

- **$0.001 per chain returned**

Examples:

- Full sweep (10 chains): **$0.01**
- Ethereum-only cron: **$0.001**

***

### Use Cases

**Personal cheap-gas notifier** — Run every 10 min with `alertEthGweiBelow: 12`. Get pinged when it's a good time to send the txs you've been delaying.

**Cost dashboard for your wallet bot** — Query before each batch tx to pick the cheapest chain among acceptable options.

**Comparative chain cost tracking** — Schedule daily, store, chart over time — see how L2 cost converges or diverges over months.

***

### Data Sources

- **Public JSON-RPC** endpoints (cloudflare-eth, arb1.arbitrum.io/rpc, mainnet.optimism.io, mainnet.base.org, polygon-rpc.com, bsc-dataseed.binance.org, api.avax.network, rpc.linea.build, rpc.scroll.io, mainnet.era.zksync.io)
- **Etherscan V2** gas oracle (Ethereum only)
- **Coingecko** for native-token USD spot
- No API key required.

***

### Limitations

- Public RPCs can rate-limit during heavy use. For production, run your own RPC.
- L2 `eth_gasPrice` is sometimes the L2 sequencer fee only — final user cost may be slightly higher due to L1 calldata cost. This Actor returns the canonical RPC value.

***

### Related Actors

- **[L2 + Chain TVL Tracker](https://apify.com/gochujang/l2-tvl-tracker)** — Pair gas cost with chain TVL to find the best low-cost / high-liquidity sweet spot.
- **[CEX Reserve Tracker](https://apify.com/gochujang/cex-reserve-tracker)** — Reserve flows often correlate with mainnet gas spikes (rotation events).

***

***

### 🎬 Live Sample Run

A real run of this actor with default-ish inputs, executed on 2026-06-10:

| Field | Value |
|---|---|
| Items in dataset | 10 |
| Dataset (JSON) | `https://api.apify.com/v2/datasets/kvvmorGz1Y5iEBPJG/items?clean=1&format=json` |
| Dataset (CSV) | `https://api.apify.com/v2/datasets/kvvmorGz1Y5iEBPJG/items?clean=1&format=csv` |
| Run summary (KVS) | `https://api.apify.com/v2/key-value-stores/yPQ6tBgkFvvB6SVVE/records/SUMMARY` |
| Run details | `https://api.apify.com/v2/actor-runs/NpVbtSxLqZHZ4Ud3J` |

**Try it now**: pop any of the dataset URLs in your browser to see live output, or hit the API endpoints from your code.

> Want to reproduce? Click **Try Actor** on the Apify Store page and use the input defaults shown above.

### Feedback

[Leave a review on Apify Store](https://apify.com/gochujang/multichain-gas-tracker#reviews)

# Actor input Schema

## `chains` (type: `array`):

Chain names to query. Empty = all supported.

## `alertEthGweiAbove` (type: `number`):

Telegram alert when Ethereum mainnet ProposeGasPrice ≥ X gwei. 0 = disabled.

## `alertEthGweiBelow` (type: `number`):

Telegram alert when Ethereum mainnet ProposeGasPrice ≤ X gwei (good time to send txs).

## `telegramBotToken` (type: `string`):

Telegram bot token.

## `telegramChatId` (type: `string`):

Chat ID.

## `etherscanApiKey` (type: `string`):

Bring your own Etherscan V2 API key for higher rate limits on the ETH gas oracle endpoint (recommended for scheduled use). Free at etherscan.io/myapikey.

## Actor input object example

```json
{
  "chains": [
    "Ethereum",
    "Arbitrum",
    "Optimism",
    "Base",
    "Polygon",
    "BNB",
    "Avalanche",
    "Linea"
  ],
  "alertEthGweiAbove": 0,
  "alertEthGweiBelow": 0,
  "telegramChatId": ""
}
```

# Actor output Schema

## `dataset` (type: `string`):

No description

## `summary` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "chains": [
        "Ethereum",
        "Arbitrum",
        "Optimism",
        "Base",
        "Polygon",
        "BNB",
        "Avalanche",
        "Linea"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("gochujang/multichain-gas-tracker").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "chains": [
        "Ethereum",
        "Arbitrum",
        "Optimism",
        "Base",
        "Polygon",
        "BNB",
        "Avalanche",
        "Linea",
    ] }

# Run the Actor and wait for it to finish
run = client.actor("gochujang/multichain-gas-tracker").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"])
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "chains": [
    "Ethereum",
    "Arbitrum",
    "Optimism",
    "Base",
    "Polygon",
    "BNB",
    "Avalanche",
    "Linea"
  ]
}' |
apify call gochujang/multichain-gas-tracker --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com/?tools=gochujang/multichain-gas-tracker",
                "--header",
                "Authorization: Bearer <YOUR_API_TOKEN>"
            ]
        }
    }
}

```

## OpenAPI specification

```json
{
    "openapi": "3.0.1",
    "info": {
        "title": "Multi-Chain Gas Tracker — ETH Arb OP Base Polygon BNB Live",
        "description": "Live gas (gwei) across 10 chains + ETH safe/propose/fast Etherscan oracle. USD cost of sample transfer + swap per chain. Catch cheap-gas windows. No API key. PPE $0.001/chain.",
        "version": "0.1",
        "x-build-id": "hidrIYFe5nmh6n8E8"
    },
    "servers": [
        {
            "url": "https://api.apify.com/v2"
        }
    ],
    "paths": {
        "/acts/gochujang~multichain-gas-tracker/run-sync-get-dataset-items": {
            "post": {
                "operationId": "run-sync-get-dataset-items-gochujang-multichain-gas-tracker",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for its completion, and returns Actor's dataset items in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        },
        "/acts/gochujang~multichain-gas-tracker/runs": {
            "post": {
                "operationId": "runs-sync-gochujang-multichain-gas-tracker",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor and returns information about the initiated run in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/runsResponseSchema"
                                }
                            }
                        }
                    }
                }
            }
        },
        "/acts/gochujang~multichain-gas-tracker/run-sync": {
            "post": {
                "operationId": "run-sync-gochujang-multichain-gas-tracker",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "inputSchema": {
                "type": "object",
                "properties": {
                    "chains": {
                        "title": "Chains",
                        "type": "array",
                        "description": "Chain names to query. Empty = all supported.",
                        "default": [],
                        "items": {
                            "type": "string"
                        }
                    },
                    "alertEthGweiAbove": {
                        "title": "Ethereum Gas Alert (gwei)",
                        "minimum": 0,
                        "type": "number",
                        "description": "Telegram alert when Ethereum mainnet ProposeGasPrice ≥ X gwei. 0 = disabled.",
                        "default": 0
                    },
                    "alertEthGweiBelow": {
                        "title": "Ethereum Cheap-Gas Alert (gwei)",
                        "minimum": 0,
                        "type": "number",
                        "description": "Telegram alert when Ethereum mainnet ProposeGasPrice ≤ X gwei (good time to send txs).",
                        "default": 0
                    },
                    "telegramBotToken": {
                        "title": "Telegram Bot Token",
                        "type": "string",
                        "description": "Telegram bot token."
                    },
                    "telegramChatId": {
                        "title": "Telegram Chat ID",
                        "type": "string",
                        "description": "Chat ID.",
                        "default": ""
                    },
                    "etherscanApiKey": {
                        "title": "Etherscan API key (optional)",
                        "type": "string",
                        "description": "Bring your own Etherscan V2 API key for higher rate limits on the ETH gas oracle endpoint (recommended for scheduled use). Free at etherscan.io/myapikey."
                    }
                }
            },
            "runsResponseSchema": {
                "type": "object",
                "properties": {
                    "data": {
                        "type": "object",
                        "properties": {
                            "id": {
                                "type": "string"
                            },
                            "actId": {
                                "type": "string"
                            },
                            "userId": {
                                "type": "string"
                            },
                            "startedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "finishedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "status": {
                                "type": "string",
                                "example": "READY"
                            },
                            "meta": {
                                "type": "object",
                                "properties": {
                                    "origin": {
                                        "type": "string",
                                        "example": "API"
                                    },
                                    "userAgent": {
                                        "type": "string"
                                    }
                                }
                            },
                            "stats": {
                                "type": "object",
                                "properties": {
                                    "inputBodyLen": {
                                        "type": "integer",
                                        "example": 2000
                                    },
                                    "rebootCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "restartCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "resurrectCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "computeUnits": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "options": {
                                "type": "object",
                                "properties": {
                                    "build": {
                                        "type": "string",
                                        "example": "latest"
                                    },
                                    "timeoutSecs": {
                                        "type": "integer",
                                        "example": 300
                                    },
                                    "memoryMbytes": {
                                        "type": "integer",
                                        "example": 1024
                                    },
                                    "diskMbytes": {
                                        "type": "integer",
                                        "example": 2048
                                    }
                                }
                            },
                            "buildId": {
                                "type": "string"
                            },
                            "defaultKeyValueStoreId": {
                                "type": "string"
                            },
                            "defaultDatasetId": {
                                "type": "string"
                            },
                            "defaultRequestQueueId": {
                                "type": "string"
                            },
                            "buildNumber": {
                                "type": "string",
                                "example": "1.0.0"
                            },
                            "containerUrl": {
                                "type": "string"
                            },
                            "usage": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "integer",
                                        "example": 1
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "usageTotalUsd": {
                                "type": "number",
                                "example": 0.00005
                            },
                            "usageUsd": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "number",
                                        "example": 0.00005
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}
```