diff --git a/AGENTS.md b/AGENTS.md
index 21539a2..2d02ddd 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -1,5 +1,13 @@
 # ELAC-Plan Agents
 
+Architecture and MVP changes
+- Added a FastAPI-based MVP API (elac_plan.api) exposing /problems, /status, and /deltas endpoints to drive the LocalProblem -> PlanDelta flow locally.
+- In-memory MVP storage for LocalProblem and PlanDelta with a toy LocalSolver and two starter adapters (NBBOFeedAdapter, BrokerGatewayAdapter).
+- Public Python package surface updated: elac_plan.api is importable via elac_plan.api.app (FastAPI app), and re-exported from elac_plan for convenience.
+- Tests: Added tests/test_api.py to validate problem creation and status endpoints using FastAPI TestClient.
+- Test runner: test.sh added to execute pytest and python -m build for packaging validation.
+- Documentation: README updated with MVP overview (next iteration to expand with Phase 1 governance, phase 2 cross-venue demos, etc.).
+
 Architecture overview:
 - Primitives: LocalProblem, SharedVariables, DualVariables, PlanDelta, Governance/AuditLog
 - Adapters: NBBOFeedAdapter (data feed), BrokerGatewayAdapter (execution gateway)
diff --git a/README.md b/README.md
index 07fe31f..37c0f15 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,22 @@
 # ELAC-Plan (Edge-Latency Aware Cross-Venue Execution Planner)
+
+This repository implements a production-oriented MVP of ELAC-Plan: an edge-native federation for cross-venue execution planning with privacy-preserving signals and deterministic delta-sync.
+
+- Primitives map to canonical primitives used across adapters:
+  - Objects: LocalProblem
+  - Morphisms: SharedVariables
+  - DualVariables: DualVariables
+  - PlanDelta: PlanDelta
+  - Governance/AuditLog: GovernanceAuditLog (stubbed for now)
+- MVP adapters:
+  - NBBOFeedAdapter: translates NBBO-like feeds into SharedVariables
+  - BrokerGatewayAdapter: simulates broker API publishing of PlanDelta
+- Solver: LocalSolver (toy solver)
+- API: FastAPI app exposing /problems and /status to drive LocalProblem -> PlanDelta flow
+- Packaging: Python packaging metadata in pyproject.toml; tests with pytest; build via python -m build
+
+How to run (dev):
+- Run tests: ./test.sh
+- Run API locally (example): uvicorn elac_plan.api:app --reload
+
+This is a minimal but production-conscious MVP intended to be extended by adding governance ledger, secure aggregation, and real adapters in subsequent iterations.
diff --git a/elac_plan/__init__.py b/elac_plan/__init__.py
index e82433d..9ad6778 100644
--- a/elac_plan/__init__.py
+++ b/elac_plan/__init__.py
@@ -4,6 +4,7 @@ from .core import LocalProblem, SharedVariables, PlanDelta, DualVariables
 from .solver import LocalSolver
 from .adapters import NBBOFeedAdapter, BrokerGatewayAdapter
 from .dsl import DSLObject, DSLMorphisms, DSLDualVariables, DSLPlanDelta
+from .api import app as api_app
 
 __all__ = [
     "LocalProblem",
@@ -17,4 +18,5 @@ __all__ = [
     "DSLMorphisms",
     "DSLDualVariables",
     "DSLPlanDelta",
+    "api_app",
 ]
diff --git a/elac_plan/api.py b/elac_plan/api.py
index e2a42ad..35dfc89 100644
--- a/elac_plan/api.py
+++ b/elac_plan/api.py
@@ -1,17 +1,45 @@
 from __future__ import annotations
-from fastapi import FastAPI
-from pydantic import BaseModel
+
+"""ELAC-Plan API
+
+Simple FastAPI-based MVP to exercise LocalProblem -> PlanDelta flow with two starter adapters.
+This is intentionally lightweight and in-process to bootstrap cross-venue planning without
+external dependencies beyond FastAPI, Pydantic (via existing dataclasses), and httpx for tests.
+"""
+
+from datetime import datetime
+import json
 from typing import Dict, Any, Optional
 
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+
 from .core import LocalProblem, PlanDelta, SharedVariables, DualVariables
 from .solver import LocalSolver
 from .adapters import NBBOFeedAdapter, BrokerGatewayAdapter
+from .dsl import (
+    DSLObject,
+    DSLMorphisms,
+    DSLDualVariables,
+    DSLPlanDelta,
+    to_dsl_object,
+    to_dsl_morphisms,
+    to_dsl_dual,
+    to_dsl_plan,
+)
 
-app = FastAPI(title="ELAC-Plan API")
+
+app = FastAPI(title="ELAC-Plan MVP API", version="0.1.0")
+
+# In-memory stores for MVP: problems and deltas
+_problems: Dict[str, LocalProblem] = {}
+_deltas: Dict[str, PlanDelta] = {}
+
+# Starter adapters (could be used by endpoints or in a factory pattern)
+_nbbo = NBBOFeedAdapter(contract_id="default-contract")
+_broker = BrokerGatewayAdapter()
 
 _solver = LocalSolver()
-_feed = NBBOFeedAdapter()
-_broker = BrokerGatewayAdapter()
 
 
 class LocalProblemInput(BaseModel):
@@ -19,27 +47,113 @@ class LocalProblemInput(BaseModel):
     asset: str
     venue: str
     objective: str
-    constraints: Dict[str, Any]
+    constraints: Optional[Dict[str, Any]] = None
     price_target: float
     tolerance: float
 
 
-@app.post("/problems")
-def create_problem(p: LocalProblemInput) -> Dict[str, Any]:
-    problem = LocalProblem(
-        id=p.id,
-        asset=p.asset,
-        venue=p.venue,
-        objective=p.objective,
-        constraints=p.constraints,
-        price_target=p.price_target,
-        tolerance=p.tolerance,
+@app.post("/problems", response_model=Dict[str, Any])
+def create_problem(problem: LocalProblemInput):
+    # Build a LocalProblem from input and run the toy solver to produce a delta
+    lp = LocalProblem(
+        id=problem.id,
+        asset=problem.asset,
+        venue=problem.venue,
+        objective=problem.objective,
+        constraints=problem.constraints or {},
+        price_target=problem.price_target,
+        tolerance=problem.tolerance,
     )
-    delta = _solver.solve(problem)
+
+    _problems[lp.id] = lp
+    delta = _solver.solve(lp)
+    _deltas[delta.contract_id] = delta
+
+    # Simulate publishing via broker gateway (stringized payload) for MVP
     _broker.publish(delta)
-    return {"problem": problem.to_json(), "delta": delta.to_json()}
+
+    return {
+        "problem_id": lp.id,
+        "delta": json.dumps(delta.delta),
+        "delta_contract": delta.contract_id,
+    }
 
 
 @app.get("/status")
-def status() -> Dict[str, Any]:
-    return {"status": "ELAC-Plan API running"}
+def status():
+    return {
+        "problems_count": len(_problems),
+        "deltas_count": len(_deltas),
+        "latest_delta_contract": max(_deltas.keys()) if _deltas else None,
+        "server_time": datetime.utcnow().isoformat() + "Z",
+    }
+
+
+@app.get("/problems/{problem_id}")
+def get_problem(problem_id: str):
+    lp = _problems.get(problem_id)
+    if not lp:
+        raise HTTPException(status_code=404, detail="problem not found")
+    return {
+        "id": lp.id,
+        "asset": lp.asset,
+        "venue": lp.venue,
+        "objective": lp.objective,
+        "price_target": lp.price_target,
+        "tolerance": lp.tolerance,
+        "constraints": lp.constraints,
+    }
+
+
+@app.get("/deltas/{contract_id}")
+def get_delta(contract_id: str):
+    delta = _deltas.get(contract_id)
+    if not delta:
+        raise HTTPException(status_code=404, detail="delta not found")
+    return {
+        "contract_id": delta.contract_id,
+        "delta": delta.delta,
+        "timestamp": delta.timestamp,
+        "author": delta.author,
+        "privacy_budget": delta.privacy_budget,
+    }
+
+
+@app.get("/dsl/{problem_id}")
+def get_problem_dsl(problem_id: str):
+    # Expose a minimal DSL representation for a given problem, including
+    # LocalProblem -> DSLObject, SharedVariables, DualVariables, and PlanDelta.
+    lp = _problems.get(problem_id)
+    if not lp:
+        raise HTTPException(status_code=404, detail="problem not found")
+
+    # Build a deterministic contract_id as used by the MVP
+    contract_id = f"{lp.id}:{lp.venue}"
+    # Rehydrate a minimal SharedVariables and DualVariables for DSL exposure
+    sw = SharedVariables(variables={}, version=1, contract_id=contract_id)
+    dv = DualVariables(shadow_prices={}, version=1, contract_id=contract_id)
+
+    # Resolve latest delta for the problem if available
+    delta = _deltas.get(contract_id)
+    if delta is None:
+        # create a minimal placeholder delta to showcase DSL shape
+        delta = PlanDelta(
+            delta={},
+            timestamp="",
+            author="unknown",
+            contract_id=contract_id,
+            privacy_budget=0.0,
+        )
+
+    # Transform to DSL structures
+    dsl_lp = to_dsl_object(lp)
+    dsl_sw = to_dsl_morphisms(sw)
+    dsl_dv = to_dsl_dual(dv)
+    dsl_plan = to_dsl_plan(delta)
+
+    return {
+        "lp": dsl_lp.to_dict(),
+        "shared_variables": dsl_sw.to_dict(),
+        "dual_variables": dsl_dv.to_dict(),
+        "plan_delta": dsl_plan.to_dict(),
+    }
diff --git a/test.sh b/test.sh
index 65917c6..6a25f12 100644
--- a/test.sh
+++ b/test.sh
@@ -1,12 +1,13 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# Run unit tests and packaging build to ensure MVP integrity
-echo "Installing package in editable mode..."
-pip install -e .
 export PYTHONPATH=$(pwd)
+
 echo "Running tests..."
 pytest -q
+
 echo "Building package..."
 python3 -m build
-echo "OK: tests and build completed."
+
+echo "All tests passed and package built."
+exit 0
diff --git a/tests/test_api.py b/tests/test_api.py
new file mode 100644
index 0000000..16683a1
--- /dev/null
+++ b/tests/test_api.py
@@ -0,0 +1,37 @@
+import json
+import pytest
+
+from fastapi.testclient import TestClient
+
+from elac_plan.api import app
+
+
+client = TestClient(app)
+
+
+def test_create_problem_smoke():
+    payload = {
+        "id": "probe-001",
+        "asset": "AAPL",
+        "venue": "XNAS",
+        "objective": "minimize_spread",
+        "constraints": {"max_slippage": 0.5},
+        "price_target": 150.0,
+        "tolerance": 0.2,
+    }
+    resp = client.post("/problems", json=payload)
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["problem_id"] == payload["id"]
+    assert "delta" in data
+    # validate delta payload json can be parsed back
+    delta = json.loads(data["delta"])
+    assert delta["action"] == "place_order"
+
+
+def test_status_endpoint():
+    resp = client.get("/status")
+    assert resp.status_code == 200
+    body = resp.json()
+    assert "problems_count" in body
+    assert "deltas_count" in body