const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.keystoneos.xyz/v1/chains', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.keystoneos.xyz/v1/chains"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

curl --request GET \
  --url https://api.keystoneos.xyz/v1/chains \
  --header 'Authorization: Bearer <token>'

[
  {
    "chain_id": 123,
    "name": "<string>",
    "escrow_address": "<string>",
    "is_coordinator_chain": true
  }
]