diff --git a/pyproject.toml b/pyproject.toml
index 11f90c6..ea1cc94 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,7 @@ dependencies = [
     "alembic>=1.18.4",
     "arq>=0.27.0",
     "asyncpg>=0.31.0",
+    "email-validator>=2.3.0",
     "fastapi>=0.135.1",
     "httpx[socks]>=0.28.1",
     "pydantic>=2.12.5",
@@ -57,4 +58,4 @@ extend-immutable-calls = ["Depends", "fastapi.Depends", "Query", "fastapi.Query"
 
 [tool.mypy]
 plugins = ["pydantic.mypy"]
-strict = true
\ No newline at end of file
+strict = true
diff --git a/src/proxy_pool/accounts/schemas.py b/src/proxy_pool/accounts/schemas.py
new file mode 100644
index 0000000..fa78026
--- /dev/null
+++ b/src/proxy_pool/accounts/schemas.py
@@ -0,0 +1,67 @@
+from datetime import datetime
+from uuid import UUID
+
+from pydantic import BaseModel, EmailStr, Field
+
+from proxy_pool.accounts.models import CreditTxType
+
+
+class UserCreate(BaseModel):
+    email: EmailStr
+    display_name: str | None = Field(default=None, max_length=128)
+
+
+class UserResponse(BaseModel):
+    model_config = {"from_attributes": True}
+
+    id: UUID
+    email: str
+    display_name: str | None
+    is_active: bool
+    created_at: datetime
+
+
+class ApiKeyResponse(BaseModel):
+    model_config = {"from_attributes": True}
+
+    id: UUID
+    prefix: str
+    label: str | None
+    is_active: bool
+    last_used_at: datetime | None
+    expires_at: datetime | None
+    created_at: datetime
+
+
+class ApiKeyCreated(BaseModel):
+    """Returned only at key creation time — includes the raw key."""
+
+    id: UUID
+    key: str
+    prefix: str
+    label: str | None
+
+
+class RegisterResponse(BaseModel):
+    user: UserResponse
+    api_key: ApiKeyCreated
+
+
+class ApiKeyCreate(BaseModel):
+    label: str | None = Field(default=None, max_length=128)
+
+
+class CreditTransactionResponse(BaseModel):
+    model_config = {"from_attributes": True}
+
+    id: UUID
+    amount: int
+    tx_type: CreditTxType
+    description: str | None
+    reference_id: UUID | None
+    created_at: datetime
+
+
+class CreditBalanceResponse(BaseModel):
+    balance: int
+    recent_transactions: list[CreditTransactionResponse]
diff --git a/uv.lock b/uv.lock
index 965f622..4108148 100644
--- a/uv.lock
+++ b/uv.lock
@@ -223,6 +223,28 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/0d/4a/331fe2caf6799d591109bb9c08083080f6de90a823695d412a935622abb2/coverage-7.13.4-py3-none-any.whl", hash = "sha256:1af1641e57cf7ba1bd67d677c9abdbcd6cc2ab7da3bca7fa1e2b7e50e65f2ad0", size = 211242, upload-time = "2026-02-09T12:59:02.032Z" },
 ]
 
+[[package]]
+name = "dnspython"
+version = "2.8.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/8c/8b/57666417c0f90f08bcafa776861060426765fdb422eb10212086fb811d26/dnspython-2.8.0.tar.gz", hash = "sha256:181d3c6996452cb1189c4046c61599b84a5a86e099562ffde77d26984ff26d0f", size = 368251, upload-time = "2025-09-07T18:58:00.022Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/ba/5a/18ad964b0086c6e62e2e7500f7edc89e3faa45033c71c1893d34eed2b2de/dnspython-2.8.0-py3-none-any.whl", hash = "sha256:01d9bbc4a2d76bf0db7c1f729812ded6d912bd318d3b1cf81d30c0f845dbf3af", size = 331094, upload-time = "2025-09-07T18:57:58.071Z" },
+]
+
+[[package]]
+name = "email-validator"
+version = "2.3.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "dnspython" },
+    { name = "idna" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/f5/22/900cb125c76b7aaa450ce02fd727f452243f2e91a61af068b40adba60ea9/email_validator-2.3.0.tar.gz", hash = "sha256:9fc05c37f2f6cf439ff414f8fc46d917929974a82244c20eb10231ba60c54426", size = 51238, upload-time = "2025-08-26T13:09:06.831Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/de/15/545e2b6cf2e3be84bc1ed85613edd75b8aea69807a71c26f4ca6a9258e82/email_validator-2.3.0-py3-none-any.whl", hash = "sha256:80f13f623413e6b197ae73bb10bf4eb0908faf509ad8362c5edeb0be7fd450b4", size = 35604, upload-time = "2025-08-26T13:09:05.858Z" },
+]
+
 [[package]]
 name = "factory-boy"
 version = "3.3.3"
@@ -668,6 +690,7 @@ dependencies = [
     { name = "alembic" },
     { name = "arq" },
     { name = "asyncpg" },
+    { name = "email-validator" },
     { name = "fastapi" },
     { name = "httpx", extra = ["socks"] },
     { name = "pydantic" },
@@ -695,6 +718,7 @@ requires-dist = [
     { name = "alembic", specifier = ">=1.18.4" },
     { name = "arq", specifier = ">=0.27.0" },
     { name = "asyncpg", specifier = ">=0.31.0" },
+    { name = "email-validator", specifier = ">=2.3.0" },
     { name = "fastapi", specifier = ">=0.135.1" },
     { name = "httpx", extras = ["socks"], specifier = ">=0.28.1" },
     { name = "pydantic", specifier = ">=2.12.5" },