Validator Client API: Authorization Header


The validator client HTTP server requires that all requests have the following HTTP header:

  • Name: Authorization
  • Value: Basic <api-token>

Where <api-token> is a string that can be obtained from the validator client host. Here is an example Authorization header:

Authorization Basic api-token-0x03eace4c98e8f77477bb99efb74f9af10d800bd3318f92c33b719a4644254d4123

Obtaining the API token

The API token can be obtained via two methods:

Method 1: Reading from a file

The API token is stored as a file in the validators directory. For most users this is ~/.lighthouse/{testnet}/validators/api-token.txt. Here's an example using the cat command to print the token to the terminal, but any text editor will suffice:

$ cat api-token.txt

Method 2: Reading from logs

When starting the validator client it will output a log message containing an api-token field:

Sep 28 19:17:52.615 INFO HTTP API started                        api_token: api-token-0x03eace4c98e8f77477bb99efb74f9af10d800bd3318f92c33b719a4644254d4123, listen_address:


Here is an example curl command using the API token in the Authorization header:

curl localhost:5062/lighthouse/version -H "Authorization: Basic api-token-0x03eace4c98e8f77477bb99efb74f9af10d800bd3318f92c33b719a4644254d4123"

The server should respond with its version: