curl --request POST \
  --url https://api.dirtroad.dev/tools/web3/evm/eth-coinbase \
  --header 'Content-Type: application/json' \
  --header 'X-Payment: <api-key>' \
  --data '{
  "chain": "<string>"
}'

{
  "chain": "<string>",
  "result": "<string>"
}