diff --git a/server/app/Dockerfile b/server/app/Dockerfile
index 090b299..4403a65 100644
--- a/server/app/Dockerfile
+++ b/server/app/Dockerfile
@@ -3,4 +3,4 @@ WORKDIR /app
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 COPY . .
-CMD ["python", "consumer.py"]
\ No newline at end of file
+ENTRYPOINT ["python"]
\ No newline at end of file
diff --git a/server/app/adapters/http/__init__.py b/server/app/adapters/http/__init__.py
new file mode 100644
index 0000000..ae6c5b9
--- /dev/null
+++ b/server/app/adapters/http/__init__.py
@@ -0,0 +1,3 @@
+from .readings import readings_router
+
+__all__ = ["readings_router"]
\ No newline at end of file
diff --git a/server/app/adapters/http/_readings_schemas.py b/server/app/adapters/http/_readings_schemas.py
new file mode 100644
index 0000000..58bc990
--- /dev/null
+++ b/server/app/adapters/http/_readings_schemas.py
@@ -0,0 +1,28 @@
+from datetime import datetime
+from pydantic import BaseModel
+
+from domain.entities import ConsumptionResponse
+
+class ConsumptionPointSchema(BaseModel):
+    period: datetime
+    pulse_count_start: int
+    pulse_count_end: int
+    delta_pulses: int
+    delta_m3: float
+
+class ConsumptionResponseSchema(BaseModel):
+    dev_eui: str
+    start: datetime
+    end: datetime
+    granularity: str
+    points: list[ConsumptionPointSchema]
+
+    @classmethod
+    def from_domain(cls, r: ConsumptionResponse) -> "ConsumptionResponseSchema":
+        return cls(
+            dev_eui=r.dev_eui,
+            start=r.start,
+            end=r.end,
+            granularity=r.granularity,
+            points=[ConsumptionPointSchema(**p.__dict__) for p in r.points],
+        )
\ No newline at end of file
diff --git a/server/app/adapters/http/main.py b/server/app/adapters/http/main.py
new file mode 100644
index 0000000..f49aea0
--- /dev/null
+++ b/server/app/adapters/http/main.py
@@ -0,0 +1,18 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from .readings import readings_router
+
+app = FastAPI(title="SimuGazAPI", version="1.0.0")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_methods=["GET"],
+    allow_headers=["*"],
+)
+
+app.include_router(readings_router)
+
+@app.get("/health")
+def health():
+    return {"status": "ok"}
\ No newline at end of file
diff --git a/server/app/adapters/http/readings.py b/server/app/adapters/http/readings.py
new file mode 100644
index 0000000..3807998
--- /dev/null
+++ b/server/app/adapters/http/readings.py
@@ -0,0 +1,30 @@
+from datetime import datetime
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, Query, HTTPException
+
+from domain.value_objects import Granularity
+from domain.exceptions import ValidationError, DatabaseError
+from services.consumption_service import ConsumptionService
+from dependencies import get_consumption_service
+
+from ._readings_schemas import ConsumptionResponseSchema
+
+readings_router = APIRouter(prefix="/readings", tags=["readings"])
+
+
+@readings_router.get("/{dev_eui}", response_model=ConsumptionResponseSchema)
+def get_consumption(
+    dev_eui: str,
+    start: Annotated[datetime, Query()],
+    end: Annotated[datetime, Query()],
+    granularity: Annotated[Granularity, Query()] = "day",
+    service: ConsumptionService = Depends(get_consumption_service),
+):
+    try:
+        result = service.get_consumption(dev_eui, start, end, granularity)
+        return ConsumptionResponseSchema.from_domain(result)
+    except ValidationError as e:
+        raise HTTPException(status_code=422, detail=str(e))
+    except DatabaseError as e:
+        raise HTTPException(status_code=500, detail=str(e))
diff --git a/server/app/adapters/postgres_query.py b/server/app/adapters/postgres_query.py
new file mode 100644
index 0000000..31d534e
--- /dev/null
+++ b/server/app/adapters/postgres_query.py
@@ -0,0 +1,54 @@
+from datetime import datetime
+
+import psycopg2
+from psycopg2.extensions import connection
+
+from domain.entities import ConsumptionPoint
+from domain.exceptions import DatabaseError
+from domain.value_objects import Granularity
+from ports.reading_query_repository import ReadingQueryRepository
+
+
+class PgReadingQueryRepository(ReadingQueryRepository):
+    def __init__(self, conn: connection) -> None:
+        self._conn = conn
+
+    def get_consumption(
+        self,
+        dev_eui: str,
+        start: datetime,
+        end: datetime,
+        granularity: Granularity,
+    ) -> list[ConsumptionPoint]:
+        date_trunc = granularity
+        query = """
+            SELECT
+                DATE_TRUNC(%s, r.date)          AS period,
+                MIN(r.pulses)                   AS pulse_start,
+                MAX(r.pulses)                   AS pulse_end,
+                MAX(r.pulses) - MIN(r.pulses)   AS delta_pulses
+            FROM reading r
+            JOIN device d ON d.device_id = r.device_id
+            WHERE d.device_eui = %s
+              AND r.date >= %s
+              AND r.date <  %s
+            GROUP BY period
+            ORDER BY period ASC
+        """
+        try:
+            with self._conn.cursor() as cur:
+                cur.execute(query, (date_trunc, dev_eui, start, end))
+                rows = cur.fetchall()
+        except psycopg2.DatabaseError as e:
+            raise DatabaseError(f"Erreur requête consumption : {e}") from e
+
+        return [
+            ConsumptionPoint(
+                period=row[0],
+                pulse_count_start=row[1],
+                pulse_count_end=row[2],
+                delta_pulses=row[3],
+                delta_m3=round(row[3] * 0.010, 3),
+            )
+            for row in rows
+        ]
diff --git a/server/app/api.py b/server/app/api.py
new file mode 100644
index 0000000..91595ba
--- /dev/null
+++ b/server/app/api.py
@@ -0,0 +1,13 @@
+import uvicorn
+
+from core.logging import setup_logging
+
+setup_logging()
+
+if __name__ == "__main__":
+    uvicorn.run(
+        "adapters.http.main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=False,
+    )
\ No newline at end of file
diff --git a/server/app/core/logging.py b/server/app/core/logging.py
new file mode 100644
index 0000000..c1b10ae
--- /dev/null
+++ b/server/app/core/logging.py
@@ -0,0 +1,13 @@
+import logging
+import sys
+import os
+
+def setup_logging() -> None:
+    level = os.getenv("LOG_LEVEL", "INFO").upper()
+    logging.basicConfig(
+        level=getattr(logging, level, logging.INFO),
+        format="%(asctime)s [%(levelname)s] %(name)s — %(message)s",
+        datefmt="%Y-%m-%dT%H:%M:%S",
+        stream=sys.stdout,
+        force=True,
+    )
\ No newline at end of file
diff --git a/server/app/dependencies.py b/server/app/dependencies.py
new file mode 100644
index 0000000..6f68a56
--- /dev/null
+++ b/server/app/dependencies.py
@@ -0,0 +1,22 @@
+import os
+from functools import lru_cache
+
+from adapters.postgres import connect
+from adapters.postgres_query import PgReadingQueryRepository
+from services.consumption_service import ConsumptionService
+
+@lru_cache
+def get_conn():
+    return connect(os.getenv("DATABASE_URL", "postgresql://simugaz:simugaz@db/simugaz"))
+
+## Repositories
+def get_query_repo() -> PgReadingQueryRepository:
+    return PgReadingQueryRepository(get_conn())
+
+
+## Services
+def get_consumption_service() -> ConsumptionService:
+    return ConsumptionService(get_query_repo())
+
+
+## Adapters
diff --git a/server/app/domain/entities/__init__.py b/server/app/domain/entities/__init__.py
index 9b2115f..eb6f6cb 100644
--- a/server/app/domain/entities/__init__.py
+++ b/server/app/domain/entities/__init__.py
@@ -1,3 +1,4 @@
 from .uplink_event import UplinkEvent
+from .consumption_point import ConsumptionPoint, ConsumptionResponse
 
-__all__ = ["UplinkEvent"]
\ No newline at end of file
+__all__ = ["UplinkEvent", "ConsumptionPoint", "ConsumptionResponse"]
\ No newline at end of file
diff --git a/server/app/domain/entities/consumption_point.py b/server/app/domain/entities/consumption_point.py
new file mode 100644
index 0000000..4d9d23b
--- /dev/null
+++ b/server/app/domain/entities/consumption_point.py
@@ -0,0 +1,19 @@
+from dataclasses import dataclass
+from datetime import datetime
+from domain.value_objects import Granularity
+
+@dataclass
+class ConsumptionPoint:
+    period: datetime
+    pulse_count_start: int
+    pulse_count_end: int
+    delta_pulses: int
+    delta_m3: float
+
+@dataclass
+class ConsumptionResponse:
+    dev_eui: str
+    start: datetime
+    end: datetime
+    granularity: Granularity
+    points: list[ConsumptionPoint]
\ No newline at end of file
diff --git a/server/app/domain/exceptions.py b/server/app/domain/exceptions.py
index fd60569..181c5ac 100644
--- a/server/app/domain/exceptions.py
+++ b/server/app/domain/exceptions.py
@@ -1,4 +1,5 @@
-# domain/exceptions.py  (ou dans domain.py directement)
+class DomainError(Exception):
+    """Base pour toutes les erreurs de domaine"""
 
 class InfrastructureError(Exception):
     """Erreur technique levée par un adapter"""
@@ -10,4 +11,7 @@ class DatabaseError(InfrastructureError):
     """Erreur lors d'une opération en base de données."""
 
 class MessageBrokerError(InfrastructureError):
-    """Impossible de se connecter au broker MQTT"""
\ No newline at end of file
+    """Impossible de se connecter au broker MQTT"""
+
+class ValidationError(DomainError):
+    """Données d'entrée invalides"""
diff --git a/server/app/domain/value_objects.py b/server/app/domain/value_objects.py
new file mode 100644
index 0000000..7651996
--- /dev/null
+++ b/server/app/domain/value_objects.py
@@ -0,0 +1,3 @@
+from typing import Literal
+
+Granularity = Literal["hour", "day", "month"]
\ No newline at end of file
diff --git a/server/app/ports/__init__.py b/server/app/ports/__init__.py
index 641a619..22dddec 100644
--- a/server/app/ports/__init__.py
+++ b/server/app/ports/__init__.py
@@ -1,5 +1,6 @@
 from .device_repository import DeviceRepository
 from .reading_repository import ReadingRepository
 from .message_broker import MessageBroker
+from .reading_query_repository import ReadingQueryRepository
 
-__all__ = ["DeviceRepository", "ReadingRepository", "MessageBroker"]
+__all__ = ["DeviceRepository", "ReadingRepository", "MessageBroker", "ReadingQueryRepository"]
diff --git a/server/app/ports/reading_query_repository.py b/server/app/ports/reading_query_repository.py
new file mode 100644
index 0000000..c07b150
--- /dev/null
+++ b/server/app/ports/reading_query_repository.py
@@ -0,0 +1,16 @@
+from abc import ABC, abstractmethod
+from datetime import datetime
+
+from domain.value_objects import Granularity
+from domain.entities import ConsumptionPoint
+
+class ReadingQueryRepository(ABC):
+    @abstractmethod
+    def get_consumption(
+        self,
+        dev_eui: str,
+        start: datetime,
+        end: datetime,
+        granularity: Granularity,
+    ) -> list[ConsumptionPoint]:
+        ...
\ No newline at end of file
diff --git a/server/app/requirements.txt b/server/app/requirements.txt
index 8227b0a..256990d 100644
--- a/server/app/requirements.txt
+++ b/server/app/requirements.txt
@@ -1,2 +1,5 @@
 paho-mqtt==v2.1.0
-psycopg2-binary
\ No newline at end of file
+psycopg2-binary==2.9.12
+pydantic==2.13.4
+fastapi==0.136.1
+uvicorn==0.46.0
\ No newline at end of file
diff --git a/server/app/services/consumption_service.py b/server/app/services/consumption_service.py
new file mode 100644
index 0000000..baacb9b
--- /dev/null
+++ b/server/app/services/consumption_service.py
@@ -0,0 +1,31 @@
+from datetime import datetime
+
+from domain.entities.consumption_point import ConsumptionResponse
+from domain.exceptions import ValidationError
+from domain.value_objects import Granularity
+from ports import ReadingQueryRepository
+
+
+class ConsumptionService:
+    def __init__(self, repo: ReadingQueryRepository) -> None:
+        self._repo = repo
+
+    def get_consumption(
+        self,
+        dev_eui: str,
+        start: datetime,
+        end: datetime,
+        granularity: Granularity,
+    ) -> ConsumptionResponse:
+        if start >= end:
+            raise ValidationError("'start' doit être antérieur à 'end'")
+
+        points = self._repo.get_consumption(dev_eui, start, end, granularity)
+
+        return ConsumptionResponse(
+            dev_eui=dev_eui,
+            start=start,
+            end=end,
+            granularity=granularity,
+            points=points,
+        )
diff --git a/server/docker-compose.yml b/server/docker-compose.yml
index d02adbb..2871b04 100644
--- a/server/docker-compose.yml
+++ b/server/docker-compose.yml
@@ -1,11 +1,24 @@
 services:
   consumer:
     build: ./app
+    image: simugaz/backend:latest
+    command: consumer.py
     restart: unless-stopped
     networks:
       - lora-gateway_mqtt
       - database
 
+  api:
+    build: ./app
+    image: simugaz/backend:latest
+    command: api.py
+    restart: unless-stopped
+    ports: 
+      - 8000:8000
+    networks:
+      - public
+      - database
+
   db:
     image: postgres:18-alpine
     restart: unless-stopped