UniOne FastAPI

FastAPI integration of the UniOne Python SDK (``): the API client in the dependencies (Depends(get_client)), a webhook endpoint with signature check.

API reference · Docs for LLMs: llms.txt

Install

pip install unione-fastapi

Requirements: Python 3.8+, FastAPI 0.100+.

Configuration

Get an API key in the control panel and keep it in the environment, never in code:

export UNIONE_API_KEY="your-api-key"

Settings are read from the environment by default:

UNIONE_API_KEY=YOUR_API_KEY
UNIONE_HOST=us1.unione.io

us1.unione.io in the example is for an account on another datacenter; without the host setting the package uses api.unione.io.

Other settings in code: app.dependency_overrides[get_settings] = lambda: Settings(api_key=...).

Webhooks

The endpoint answers GET with 200 OK (the URL check of webhook/set) and accepts the POST notifications: it checks the auth field (MD5 of the request body in which the auth value is replaced by the API key), answers 401 to a wrong signature, and passes the notification and each of its events to the application.

from unione_wrapper import Webhooks

webhooks = Webhooks()


@webhooks.on_event
async def on_event(event, user):
    data = event.event_data
    print(event.event_name, data.email, data.status)


app.include_router(webhooks.router())  # /unione/webhook

Register the URL of the endpoint with webhook/set, e.g. https://example.com/unione/webhook.

Answer 200 within 3 seconds and process the events in the background (a queue): otherwise UniOne repeats the request every 10 minutes for 24 hours (retry_count grows), and a handler that failed every request for at least 10 events of a day is turned inactive. The handler must take at least 5 parallel requests of up to 100 events each; deduplicate, a repeat delivers the same events again.

API client

Every section of the API is available on the client, see the SDK docs.

from fastapi import Depends, FastAPI
from unione import UniOneClient
from unione_wrapper import get_client

app = FastAPI()


@app.get("/usage")
def usage(client: UniOneClient = Depends(get_client)):  # the client is synchronous: a def endpoint
    info = client.system.info()
    return {"emails_sent": info.accounting.emails_sent if info.accounting else None}

Sending through the API

The client calls email/send with all of its options: templates, substitutions, metadata, tracking. Fields of the request and other examples: Python SDK docs.

from fastapi import Depends
from unione import UniOneClient
from unione.api.email import EmailSendRequest, MessageObject, MessageObjectRecipientsItem as Recipient
from unione.common import BodyObject
from unione_wrapper import get_client


@app.post("/send")
def send_email(client: UniOneClient = Depends(get_client)):
    response = client.email.send(EmailSendRequest(
        message=MessageObject(
            recipients=[Recipient.from_address("Alex <alex@example.com>")],
            from_email="shop@example.com",
            from_name="Shop",
            subject="Your order",
            body=BodyObject.from_html("<p>Hello, {{to_name}}! Your order has shipped.</p>"),
        ),
    ))
    return {"job_id": response.job_id}

No domain yet: the test sandbox domain

Until your domain is verified, send from the sandbox domain: a test domain every account has, already verified, with DKIM and SPF set. It delivers only to addresses you confirm (the confirmation link comes by email, valid 48 hours), up to 100 emails a day. The sandbox domain is deleted 31 days after it was created, but you can get it again: the next domain/get-sandbox-domain call creates a new one (with a new name, so read it from the call, do not hardcode it).

The examples use the API client of the package (see the configuration above).

from fastapi import Depends
from unione import UniOneClient
from unione.api.confirmed_email import ConfirmedEmailRequest
from unione.api.email import EmailSendRequest, MessageObject, MessageObjectRecipientsItem as Recipient
from unione.common import BodyObject
from unione_wrapper import get_client


@app.post("/sandbox")
def send_from_sandbox(client: UniOneClient = Depends(get_client)):
    # 1. Your sandbox domain: created on the first call, the same one afterwards
    domain = client.domain.get_sandbox_domain().domain

    # 2. Confirm your inbox: UniOne sends a link, click it within 48 hours
    client.confirmed_email.create(ConfirmedEmailRequest(email="you@example.com"))

    # 3. Send from any address on the sandbox domain to the confirmed one
    client.email.send(EmailSendRequest(
        message=MessageObject(
            recipients=[Recipient.from_address("you@example.com")],
            from_email=f"noreply@{domain}",
            subject="Hello from UniOne",
            body=BodyObject.from_html("<p>It works!</p>"),
        ),
    ))

    return {"domain": domain}

BASE=https://api.unione.io/en/transactional/api/v1

curl -s -X POST $BASE/domain/get-sandbox-domain.json \
  -H "Content-Type: application/json" -H "X-API-KEY: $UNIONE_API_KEY" -d '{}'

curl -s -X POST $BASE/confirmed-email/create.json \
  -H "Content-Type: application/json" -H "X-API-KEY: $UNIONE_API_KEY" \
  -d '{"email": "you@example.com"}'

curl -s -X POST $BASE/email/send.json \
  -H "Content-Type: application/json" -H "X-API-KEY: $UNIONE_API_KEY" \
  -d '{
        "message": {
          "recipients": [
            {
              "email": "you@example.com"
            }
          ],
          "from_email": "noreply@<sandbox-domain>",
          "subject": "Hello from UniOne",
          "body": {
            "html": "<p>It works!</p>"
          }
        }
      }'

Going to production

1. Verify your sending domain. domain/get-dns-records returns the verification record, the DKIM key and the DMARC target; add the records at your DNS provider, then domain/validate-verification-record and domain/validate-dkim.

2. Make sending reliable.

Help

• Integration guides
• Python SDK
• AI coding agents: llms.txt, the MCP server, skills: npx skills add https://github.com/unione-repo/unione-skills.git
• Support · Issues
• Contributing: AGENTS.md — the package is generated from the OpenAPI spec.