diff --git a/src/memory_manager/api/app.py b/src/memory_manager/api/app.py
new file mode 100644
index 0000000..e465212
--- /dev/null
+++ b/src/memory_manager/api/app.py
@@ -0,0 +1,194 @@
+"""FastAPI application for memory manager API."""
+import os
+from contextlib import asynccontextmanager
+from typing import List, Optional
+
+from fastapi import FastAPI, HTTPException, Query
+from fastapi.middleware.cors import CORSMiddleware
+
+from memory_manager.core.services import MemoryService, CommitService
+from memory_manager.db.repository import MemoryRepository
+from memory_manager.api.schemas import (
+    MemoryEntryCreate,
+    MemoryEntryUpdate,
+    MemoryEntryResponse,
+    CommitCreate,
+    CommitResponse,
+    DiffResponse,
+    StatsResponse,
+)
+
+
+repository: Optional[MemoryRepository] = None
+memory_service: Optional[MemoryService] = None
+commit_service: Optional[CommitService] = None
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    global repository, memory_service, commit_service
+    db_path = os.getenv("MEMORY_DB_PATH", ".memory/codebase_memory.db")
+    os.makedirs(os.path.dirname(db_path), exist_ok=True)
+    repository = MemoryRepository(db_path)
+    await repository.init_db()
+    memory_service = MemoryService(repository)
+    commit_service = CommitService(repository)
+    yield
+    if repository:
+        await repository.close()
+
+
+app = FastAPI(
+    title="Agentic Codebase Memory Manager API",
+    description="A centralized memory store for AI coding agents",
+    version="0.1.0",
+    lifespan=lifespan,
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+def entry_to_response(entry) -> MemoryEntryResponse:
+    return MemoryEntryResponse(
+        id=entry.id,
+        title=entry.title,
+        content=entry.content,
+        category=entry.category.value,
+        tags=entry.tags or [],
+        agent_id=entry.agent_id,
+        project_path=entry.project_path,
+        created_at=entry.created_at,
+        updated_at=entry.updated_at,
+        parent_id=entry.parent_id,
+    )
+
+
+@app.get("/")
+def root():
+    return {"message": "Agentic Codebase Memory Manager API", "version": "0.1.0"}
+
+
+@app.get("/api/memory", response_model=List[MemoryEntryResponse])
+async def list_memory(
+    category: Optional[str] = Query(None),
+    agent_id: Optional[str] = Query(None),
+    limit: int = Query(100, ge=1, le=1000),
+    offset: int = Query(0, ge=0),
+):
+    entries = await memory_service.list_entries(
+        category=category,
+        agent_id=agent_id,
+        limit=limit,
+        offset=offset,
+    )
+    return [entry_to_response(e) for e in entries]
+
+
+@app.post("/api/memory", response_model=MemoryEntryResponse)
+async def create_memory(entry: MemoryEntryCreate):
+    new_entry = await memory_service.create_entry(
+        title=entry.title,
+        content=entry.content,
+        category=entry.category,
+        tags=entry.tags,
+        agent_id=entry.agent_id,
+        project_path=entry.project_path,
+        parent_id=entry.parent_id,
+    )
+    return entry_to_response(new_entry)
+
+
+@app.get("/api/memory/{entry_id}", response_model=MemoryEntryResponse)
+async def get_memory(entry_id: int):
+    entry = await memory_service.get_entry(entry_id)
+    if not entry:
+        raise HTTPException(status_code=404, detail="Entry not found")
+    return entry_to_response(entry)
+
+
+@app.put("/api/memory/{entry_id}", response_model=MemoryEntryResponse)
+async def update_memory(entry_id: int, entry: MemoryEntryUpdate):
+    updated = await memory_service.update_entry(
+        entry_id=entry_id,
+        title=entry.title,
+        content=entry.content,
+        category=entry.category,
+        tags=entry.tags,
+    )
+    if not updated:
+        raise HTTPException(status_code=404, detail="Entry not found")
+    return entry_to_response(updated)
+
+
+@app.delete("/api/memory/{entry_id}")
+async def delete_memory(entry_id: int):
+    deleted = await memory_service.delete_entry(entry_id)
+    if not deleted:
+        raise HTTPException(status_code=404, detail="Entry not found")
+    return {"message": "Entry deleted successfully"}
+
+
+@app.get("/api/memory/search/query", response_model=List[MemoryEntryResponse])
+async def search_memory(
+    q: str = Query(..., min_length=1),
+    category: Optional[str] = Query(None),
+    tags: Optional[str] = Query(None),
+):
+    tag_list = tags.split(",") if tags else None
+    entries = await memory_service.search_entries(
+        query=q,
+        category=category,
+        tags=tag_list,
+    )
+    return [entry_to_response(e) for e in entries]
+
+
+@app.post("/api/memory/commit", response_model=CommitResponse)
+async def create_commit(commit: CommitCreate):
+    new_commit = await commit_service.create_commit(
+        message=commit.message,
+        agent_id=commit.agent_id,
+        project_path=commit.project_path,
+    )
+    return CommitResponse(
+        id=new_commit.id,
+        hash=new_commit.hash,
+        message=new_commit.message,
+        agent_id=new_commit.agent_id,
+        project_path=new_commit.project_path,
+        created_at=new_commit.created_at,
+    )
+
+
+@app.get("/api/memory/log", response_model=List[CommitResponse])
+async def get_log(limit: int = Query(50, ge=1, le=1000)):
+    commits = await commit_service.get_commits(limit=limit)
+    return [
+        CommitResponse(
+            id=c.id,
+            hash=c.hash,
+            message=c.message,
+            agent_id=c.agent_id,
+            project_path=c.project_path,
+            created_at=c.created_at,
+        )
+        for c in commits
+    ]
+
+
+@app.get("/api/memory/diff/{hash1}/{hash2}", response_model=DiffResponse)
+async def diff_commits(hash1: str, hash2: str):
+    diff_result = await commit_service.diff_commits(hash1, hash2)
+    return DiffResponse(**diff_result)
+
+
+@app.get("/api/memory/stats", response_model=StatsResponse)
+async def get_stats():
+    stats = await repository.get_stats()
+    return StatsResponse(**stats)