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I’m doing it with terragrunt. 1 deployer role in the infra account which assume a deployer role in each account

how does it assume the deployer role in each account?

in your terragrunt.hcl youhave this property
`iam_role = "arn:aws:iam::${local.aws_account_id}:role/Deployer"`

infracost just rely on tf/tg so it’s assuming the role you use in your tf

nah it doesn't.

<https://www.infracost.io/docs/features/usage_based_resources/>