Decode Arbitrum Staking Events Free via Camp API

Camp: free REST API serving 12 decoded Graph Horizon staking events from Arbitrum One at chain tip. No signup or API key. Indexes protocol events via Amp node into parquet; one bounded SQL query per endpoint. Filterable by address, block range ≤100k. Raw POST /v1/sql escape hatch for aggregation. Free, rate-limited, no SLA.