backing current derived

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {}
  },
  "output": {
    "type": "json",
    "example": {
      "ts": "2026-09-15T02:00:00Z",
      "basis": "measured",
      "network": "robinhood",
      "chain_id": 4663,
      "lag_blocks": 5,
      "as_of_block": 63824000,
      "pol_eth_raw": null,
      "pol_std_raw": null,
      "pol_positions": null,
      "serving_state": "fresh",
      "reserve_assets": [],
      "circulating_raw": "500000000000000000000000",
      "expansion_vault": {
        "address": "0x9a6f75ae9e8bdb68e1d12a9adccd0bb2958e3c22",
        "custody": {
          "type": "multisig",
          "threshold": 2,
          "owner_count": 4
        }
      },
      "pol_balance_note": "Idle balances, position principal, uncollected fees, and total controlled inventory are exposed separately.",
      "pol_idle_eth_raw": null,
      "pol_idle_std_raw": null,
      "contraction_vault": {
        "address": "0x796e80e8abcedc30c700a9587f7933d3342b8946",
        "custody": {
          "type": "contract",
          "threshold": null,
          "owner_count": null
        }
      },
      "expansion_eth_raw": "18200000000000000000",
      "pol_balance_scope": "manager_wallet_idle_balances",
      "vault_as_of_block": 63824000,
      "pol_position_basis": "position_inventory_unavailable",
      "supply_as_of_block": 63824000,
      "contraction_eth_raw": "9100000000000000000",
      "cumulative_buybacks": {
        "count": 12,
        "eth_spent_raw": "1500000000000000000",
        "tokens_burned_raw": "2000000000000000000000"
      },
      "expansion_vault_usdg": {
        "note": "USDG held at the address the registry currently lists as the expansion vault, in USDG's own units (6 decimals). It is not converted to ETH because no USDG price source is available, the same as every entry in reserve_assets.",
        "amount_raw": "217548505491",
        "as_of_block": 63824000,
        "unconverted": true
      },
      "pol_position_eth_raw": null,
      "pol_position_std_raw": null,
      "incentives_vault_note": "incentives_vault_std_raw is STANDARD forwarded here by Protocol v1.1's bid-side-only POL buybacks; it is held for incentive purposes, not ETH backing, and is reported separately from pol_total_controlled_std_raw and eth_backing_per_standard.",
      "eth_backing_per_standard": {
        "note": "pol_total_controlled_eth_raw is protocol-owned liquidity paired against the STANDARD/ETH pool, not a free reserve claimable against circulating supply; excluding_pol is the conservative figure, including_pol adds it back in and is null whenever pol_position_basis is position_inventory_unavailable",
        "excluding_pol": "0.0000546",
        "including_pol": null
      },
      "incentives_vault_std_raw": null,
      "sbills_locked_principal_raw": "500000000000000000000000",
      "pol_total_controlled_eth_raw": null,
      "pol_total_controlled_std_raw": null,
      "pol_uncollected_fees_eth_raw": null,
      "pol_uncollected_fees_std_raw": null
    }
  }
}