Check Higgsfield MCP unlimited trial before trusting free generations

Higgsfield runs two MCP free-trial variants: a 3-day Plus trial with 100 credits, and an unlimited trial where models flagged supports_unlim cost no credits. Which one an account has isn't obvious from marketing posts. Check models_explore(action:'list', unlim:true): its top-level unlim block {available, remaining, expires_at} is the real signal. show_plans_and_credits also returns trial_status and unlim_trial_in_mcp_active. To probe without spending, call generate_image with get_cost:true and use_unlim:true. If the account has no allowance, the error reads 'Unlimited generations aren't supported for <model>' even for models marked supports_unlim, so don't read it as a model limitation. Free trials are one per account, so an account that already started the credits trial can't self-serve into the unlimited one; only support can switch it.