Configuration of API Access

Configuration of API Access

Besides using the all-in-one Tenderly development platform via the Dashboard, you can interact with our features via Tenderly API. Use the API when you need to programmatically create a Fork, retrieve all Forks you created in your project, run simulation bundles, simulate the execution of an arbitrary transaction, and more.

Get an API key

To get your Access Token, go to Settings > Authorization and click Create Access Token. If you want to create an organization token, you can do so from your organization’s settings page.

The token you get will be used in API authentication.

Do not share the API Access token freely.

Configure your API client

The token must be sent via X-Access-Key HTTP header.

Here’s an example of configuring Axios to work with Tenderly, assuming you’ll use dotenv to store your secrets.

import axios from 'axios';
import * as dotenv from 'dotenv';
export const anAxiosOnTenderly = () =>
    baseURL: '',
    headers: {
      'X-Access-Key': process.env.TENDERLY_ACCESS_KEY || '',
      'Content-Type': 'application/json',

Project-related operations

With Tenderly API, you can either do operations that are related to your particular project or a specific Fork. In these cases, you need to specify your project’s slug and the user: TENDERLY_USER and TENDERLY_PROJECT.

You can extract it from the Dashboard URL and place these in a safe place:

Here's an example of usage:

const { TENDERLY_USER, TENDERLY_PROJECT } = process.env;
const tAxios = anAxiosOnTenderly();
const projectBase = `account/${TENDERLY_USER}/project/${TENDERLY_PROJECT}`;
const resp = await tAxios.get(`${projectBase}/simulations`);

Example of the .env file

By this time, your .env file (at the root of your npm project) holds these three items: