diff --git a/deltax_forge_cross/__init__.py b/deltax_forge_cross/__init__.py
index 2652e02..eb96682 100644
--- a/deltax_forge_cross/__init__.py
+++ b/deltax_forge_cross/__init__.py
@@ -13,6 +13,12 @@ except Exception:
     DeltaCRDT = None  # type: ignore
     deterministic_merge = None  # type: ignore
 from .ledger import LedgerSigner, sign_and_append
+try:
+    # Re-export optional CRDT helpers if present
+    from .ir import LocalArbProblem, SharedSignals  # type: ignore
+except Exception:
+    LocalArbProblem = None  # type: ignore
+    SharedSignals = None  # type: ignore
 
 __all__ = [
   "Asset",
@@ -31,4 +37,7 @@ __all__ = [
   # Delta synchronization primitives (optional extension)
   "DeltaCRDT",
   "deterministic_merge",
+  # IR scaffolds
+  "LocalArbProblem",
+  "SharedSignals",
 ]
diff --git a/deltax_forge_cross/core/central_curator.py b/deltax_forge_cross/core/central_curator.py
index c5cb092..6cf8972 100644
--- a/deltax_forge_cross/core/central_curator.py
+++ b/deltax_forge_cross/core/central_curator.py
@@ -31,3 +31,33 @@ class CentralCurator:
             total = sum(d.get(k, 0.0) for d in local_deltas)
             shared[k] = total / len(local_deltas)
         return shared
+
+    def coordinate_admm(self, local_deltas: List[Dict[str, float]], rho: float = 0.5) -> Dict[str, float]:
+        """Lightweight ADMM-inspired coordination.
+
+        Produces a conservative, stable cross-venue delta by combining the
+        simple average with a small correction towards the per-venue means.
+        This is a minimal, deterministic placeholder for a full ADMM-like
+        coordinator used in the MVP to illustrate cross-venue coherence.
+        """
+        if not local_deltas:
+            return {}
+
+        # Primal (shared) update: average across venues
+        keys = set().union(*local_deltas)
+        shared: Dict[str, float] = {}
+        means: Dict[str, float] = {}
+        for k in keys:
+            values = [d.get(k, 0.0) for d in local_deltas]
+            means[k] = sum(values) / len(values) if values else 0.0
+            shared[k] = means[k]
+
+        # Dual-adjustment toward per-venue means (conservative bias)
+        adjusted: Dict[str, float] = {}
+        for k in keys:
+            adjusted[k] = shared.get(k, 0.0) - rho * (shared.get(k, 0.0) - means.get(k, 0.0))
+        return adjusted
+
+    def coordinate_with_admm(self, local_deltas: List[Dict[str, float]], rho: float = 0.5) -> Dict[str, float]:
+        """Public wrapper to expose ADMM-like coordination."""
+        return self.coordinate_admm(local_deltas, rho)
diff --git a/deltax_forge_cross/ir.py b/deltax_forge_cross/ir.py
new file mode 100644
index 0000000..f34453d
--- /dev/null
+++ b/deltax_forge_cross/ir.py
@@ -0,0 +1,111 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Dict, List
+
+
+@dataclass
+class LocalArbProblem:
+    venue_id: str
+    assets: List[str]
+    target_delta_budget: float
+    liquidity_budget: float
+    latency_budget: float
+
+    def to_dict(self) -> Dict:
+        return {
+            "venue_id": self.venue_id,
+            "assets": list(self.assets),
+            "target_delta_budget": self.target_delta_budget,
+            "liquidity_budget": self.liquidity_budget,
+            "latency_budget": self.latency_budget,
+        }
+
+
+@dataclass
+class SharedSignals:
+    version: int
+    price_deltas: Dict[str, float]  # asset_symbol -> delta
+    correlations: Dict[str, float] = field(default_factory=dict)
+
+    def to_dict(self) -> Dict:
+        return {
+            "version": self.version,
+            "price_deltas": dict(self.price_deltas),
+            "correlations": dict(self.correlations),
+        }
+
+
+@dataclass
+class PlanDeltaIR:
+    delta_actions: Dict[str, float]
+    timestamp: float
+    contract_id: str
+    author_signature: str
+
+    def to_dict(self) -> Dict:
+        return {
+            "delta_actions": dict(self.delta_actions),
+            "timestamp": self.timestamp,
+            "contract_id": self.contract_id,
+            "author_signature": self.author_signature,
+        }
+
+
+@dataclass
+class DualVariables:
+    shadow_prices: Dict[str, float] = field(default_factory=dict)
+
+    def to_dict(self) -> Dict:
+        return {"shadow_prices": dict(self.shadow_prices)}
+
+
+@dataclass
+class PrivacyBudget:
+    per_message_budget: float
+    total_budget: float
+
+    def to_dict(self) -> Dict:
+        return {
+            "per_message_budget": self.per_message_budget,
+            "total_budget": self.total_budget,
+        }
+
+
+@dataclass
+class AuditLog:
+    entries: List[str] = field(default_factory=list)
+
+    def to_dict(self) -> Dict:
+        return {"entries": list(self.entries)}
+
+
+@dataclass
+class TimeRounds:
+    rounds: int
+    round_length_seconds: float
+
+    def to_dict(self) -> Dict:
+        return {"rounds": self.rounds, "round_length_seconds": self.round_length_seconds}
+
+
+@dataclass
+class GoCRegistryEntry:
+    contract: str
+    version: str
+    metadata: Dict[str, str] = field(default_factory=dict)
+
+    def to_dict(self) -> Dict:
+        return {"contract": self.contract, "version": self.version, "metadata": dict(self.metadata)}
+
+
+__all__ = [
+    "LocalArbProblem",
+    "SharedSignals",
+    "PlanDeltaIR",
+    "DualVariables",
+    "PrivacyBudget",
+    "AuditLog",
+    "TimeRounds",
+    "GoCRegistryEntry",
+]