The ICRC Website states as follows:
Research conducted free of charge
Research is carried out free of charge when it has been requested by the individual concerned himself/herself or by his/her next of kin (brother, sister, wife, husband, father, mother, children, grand-children).
Paid research:
In all cases other than the above, a fee of 100 Swiss francs is charged per research. When your case is dealt with you will receive an e-mail setting out the procedure for payment