diff --git a/imajin/pyproject.toml b/imajin/pyproject.toml
index e76d96ab..5a4476a3 100644
--- a/imajin/pyproject.toml
+++ b/imajin/pyproject.toml
@@ -18,6 +18,9 @@ dependencies = [
     "uvicorn[standard]>=0.32.0",
     "pydantic>=2.0.0",
     "pydantic-settings>=2.6.0",
+    # Service discovery (federated with lilith-platform)
+    "lilith-service-addresses>=1.0.1",
+    "pyyaml>=6.0",
 ]
 
 [project.optional-dependencies]
diff --git a/imajin/src/imajin/settings.py b/imajin/src/imajin/settings.py
index 698f3b98..75233ab0 100644
--- a/imajin/src/imajin/settings.py
+++ b/imajin/src/imajin/settings.py
@@ -1,25 +1,69 @@
 """
 Imajin Settings
 
-Configuration loaded from environment and service-addresses.
+Configuration loaded from environment and lilith-service-addresses.
+For federation with lilith-platform, set:
+  LILITH_PORTS_PATH=~/Code/@applications/@lilith/lilith-platform/infrastructure/ports.yaml
+
 Services depend on their configs directly - no prop drilling.
 """
 
 from functools import lru_cache
 from pathlib import Path
 from typing import Optional
+import os
 
 from pydantic_settings import BaseSettings
 
+# Try to use service-addresses for port discovery
+_SERVICE_ADDRESSES_AVAILABLE = False
+try:
+    from lilith_service_addresses import (
+        init_service_registry,
+        get_service_port,
+        is_registry_initialized,
+    )
+    _SERVICE_ADDRESSES_AVAILABLE = True
+except ImportError:
+    pass
+
+
+def _get_imajin_port(service: str, port_type: str, default: int) -> int:
+    """Get port from service-addresses or fall back to default."""
+    if not _SERVICE_ADDRESSES_AVAILABLE:
+        return default
+
+    try:
+        # Initialize registry if not done (reads from LILITH_PORTS_PATH)
+        if not is_registry_initialized():
+            ports_path = os.environ.get("LILITH_PORTS_PATH")
+            if ports_path:
+                init_service_registry(ports_path=ports_path)
+            else:
+                return default
+
+        # Try to get port from registry
+        # Format: get_service_port('imajin', 'api') for imajin.api
+        port = get_service_port(service, port_type)
+        return port if port else default
+    except Exception:
+        return default
+
 
 class ImajinSettings(BaseSettings):
-    """Main imajin service settings."""
+    """Main imajin service settings.
+
+    Ports are resolved in order:
+    1. Environment variables (IMAJIN_IMAJIN_DIFFUSION_URL, etc.)
+    2. lilith-service-addresses (if LILITH_PORTS_PATH is set)
+    3. Hardcoded defaults
+    """
 
     # Service URLs - can be overridden via env vars
-    # Default to localhost with ports from ports.yaml
-    imajin_diffusion_url: str = "http://127.0.0.1:8002"
-    imajin_prompt_url: str = "http://127.0.0.1:8003"
-    imajin_processing_url: str = "http://127.0.0.1:8004"
+    # Defaults use service-addresses when available, otherwise hardcoded ports
+    imajin_diffusion_url: str = ""
+    imajin_prompt_url: str = ""
+    imajin_processing_url: str = ""
 
     # Redis for job storage/coordination
     redis_url: str = "redis://127.0.0.1:6379"
@@ -36,6 +80,25 @@ class ImajinSettings(BaseSettings):
     # Output
     output_dir: Optional[Path] = None
 
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+        # Resolve URLs from service-addresses if not set via env
+        if not self.imajin_diffusion_url:
+            port = _get_imajin_port("imajin", "diffusion", 8002)
+            self.imajin_diffusion_url = f"http://127.0.0.1:{port}"
+
+        if not self.imajin_prompt_url:
+            port = _get_imajin_port("imajin", "prompt", 8003)
+            self.imajin_prompt_url = f"http://127.0.0.1:{port}"
+
+        if not self.imajin_processing_url:
+            port = _get_imajin_port("imajin", "processing", 8005)
+            self.imajin_processing_url = f"http://127.0.0.1:{port}"
+
+        if not self.api_port:
+            self.api_port = _get_imajin_port("imajin", "api", 8080)
+
     class Config:
         env_prefix = "IMAJIN_"
         env_file = ".env"