# Oracles (Non-Negotiable for PMM Pegged Systems)

## Minimum viable

- **USD tokens**: `P_oracle = 1.00` (with external sanity check)
- **EUR tokens**: **EURUSD** feed
- Optional: stablecoin health feeds (depeg detection)

## Requirements

- **Median of multiple sources** (or fallback hierarchy)
- **Heartbeat + staleness checks**
- **If oracle stale** → widen bands or pause active trades

## Policy

- Do not trade against a stale oracle; treat staleness as a risk trigger.
- Document fallback order (e.g. primary chainlink, secondary Pyth, tertiary internal).

Config and peg bands: [../config/peg-bands.json](../config/peg-bands.json) (includes **`gruPolicyIntegration`** linking proxmox `docs/04-configuration/GRU_REFERENCE_PRIMACY_AND_MESH_EXECUTION_MODEL.md` — oracle targets remain subordinate to institution-grade references).

Parent verifier: proxmox `scripts/verify/check-gru-reference-primacy-integration.sh`.