Is there any guidelines from IFRC regarding subject noted.
Dear Zulfiqar that is a great question.
I have checked with the IFRC Geneva WASH lead for Emergencies and there is no specific IFRC WASH Guideline for Market Based Programming at the moment. However, there is the Global Wash Cluster Market Based Programming Guidance here: https://washcluster.net/sites/default/files/inline-files/GWC_MBP-WASH_Guidance_190809.pdf
And there is also the UNHCR Cash Based Interventions for WASH Programmes in Refugee Settings which is available here.
These are probably the best places to start.
I am curious to what sort of intervention you are considering and what sort of context you are working in, and to whether either of those links above are of any use to you (if you have not already seen them before). If you write back, I will respond more quickly!