ground-motion

Ground subsidence/uplift for US addresses (negative mm/yr = sinking). Decision tree: 0) no API key? register_agent (FREE) issues one instantly — save it and use it as the Bearer token; 1) get_coverage (FREE) or check_ground_motion with dry_run=true (FREE) to confirm coverage + cost; 2) check_ground_motion to buy the $0.40 report; route logic on assessment_code (rapid_subsidence/notable_subsidence/stable/mild_uplift/strong_uplift/no_clear_trend). Use max_age_days/min_confidence/since/require_significant to avoid paying for data you'd reject — those return FREE (require_significant=true skips paying when the rate would be no_clear_trend statistical noise; dry_run also returns likely_significant so you can predict answer quality before spending). check_portfolio for many addresses (supports max_spend_usd budget cap); get_coverage accepts addresses[] to size a whole job free; get_account for balance; get_usage for the billing ledger; out of credits? buy_credits returns a payment link (