Mista Python SDK

Official Python client for the Mista Messaging, Verify and Voice APIs. Full API reference: https://docs.mista.io

pip install mista

Requires Python 3.9+. The only dependency is httpx. Both a synchronous (Mista) and an asynchronous (AsyncMista) client are included.

Quickstart

from mista import Mista

mista = Mista(token="...")  # or set MISTA_API_TOKEN

message = mista.sms.send(to="+1555***4567", sender_id="YourBrand", message="Your order has shipped")
print(message["uid"], message["status"])

Get your API token in the dashboard under Settings → API. Responses are plain dicts with the same snake_case keys as the docs (typed as TypedDicts in mista.types).

Async:

import asyncio
from mista import AsyncMista

async def main() -> None:
    async with AsyncMista() as mista:
        balance = await mista.account.balance()
        print(balance["remaining_unit"])

asyncio.run(main())

Every method below works the same way on AsyncMista; just await it.

SMS

sms.send sends one message to one recipient. To reach several numbers, or to schedule a send, use a campaign.

message = mista.sms.send(
    to="+1555***4567",
    sender_id="YourBrand",
    message="Hello",
    type="plain",  # plain | unicode | voice | mms | whatsapp | viber | otp
)
latest = mista.logs.get(message["uid"])
latest["status"]         # "Queued" | "Sent" | "Delivered" | "Undelivered" | "Expired" | "Rejected" | "Failed"
latest["status_detail"]  # why it failed, e.g. "Undelivered (handset unreachable)"; None otherwise

Queued means the carrier has not accepted the message yet and Sent means it was accepted and is waiting for the handset's delivery report. The other five statuses are final. To be told when a message reaches one, register a delivery report webhook instead of polling.

Campaigns

from datetime import datetime

# Broadcast: one message, up to 10,000 numbers
mista.campaigns.bulk(
    sender_id="LOYALTY",
    recipients=["+1555***4567", "+1555***7890"],
    message="Double points this weekend!",
    schedule_time=datetime(2026, 12, 24, 9, 0),  # or "2026-12-24 09:00"; account timezone
)

# Personalized: one message per number
mista.campaigns.bulk(
    sender_id="LOYALTY",
    recipients=[
        {"to": "+1555***4567", "message": "Hi Alice, you have 120 points."},
        {"to": "+1555***7890", "message": "Hi Bob, you have 45 points."},
    ],
)

# Everyone in one or more contact groups
mista.campaigns.send_to_groups(group_uids=["grp_uid"], sender_id="YourBrand", message="Hi!")

campaign = mista.campaigns.get("campaign_uid")

Message logs

page = mista.logs.list(start_date="2026-10-01", status="Delivered", per_page=50)
page.items        # this page
page.meta.total   # total matches

for message in page:  # walks every remaining page (use `async for` with AsyncMista)
    print(message["uid"], message["status"])

Filters: page, per_page, start_date, end_date (Y-m-d), sender_id, status, sms_type. When nothing matches, you get an empty page.

Account

balance = mista.account.balance()  # {"remaining_unit": ..., "expired_on": ...}
me = mista.account.me()

Contact groups and contacts

group = mista.contact_groups.create("Developers")
mista.contact_groups.list()
mista.contact_groups.get(group["uid"])
mista.contact_groups.update(group["uid"], "Developers KGL")

contact = mista.contacts.create(
    group["uid"],
    phone="+1555***4567",
    first_name="Alice",
    last_name="Uwase",
    fields={"CITY": "Kigali"},  # custom fields, keyed by the group's field tag
)
mista.contacts.list(group["uid"])
mista.contacts.get(group["uid"], contact["uid"])
mista.contacts.update(group["uid"], contact["uid"], phone="+1555***4567", first_name="Alicia")
mista.contacts.delete(group["uid"], contact["uid"])

mista.contact_groups.delete(group["uid"])  # also deletes its contacts

Verify (OTP)

verification = mista.verify.start(to="+1555***4567", channel="sms")

result = mista.verify.check(sid=verification["sid"], code="123456")
if result["verified"]:
    ...  # signed in
else:
    print(result["reason"])  # e.g. "invalid_code"; a wrong code does not raise

mista.verify.get(verification["sid"])

Voice

token = mista.voice.access_token(platform="ios")["token"]
numbers = mista.voice.numbers()
calls = mista.voice.calls.list(filter="missed", per_page=20)
call = mista.voice.calls.get("call_uid")

Delivery report webhooks

Mista POSTs a signed JSON event to your URL when a message is delivered (message.delivered) or fails (message.failed, with status Undelivered, Expired, Rejected or Failed).

webhook = mista.webhooks.set(url="https://example.com/webhooks/mista")
webhook["secret"]  # "whsec_..." - store it; you need it to verify requests

mista.webhooks.test()  # sends a signed webhook.test event now: {"delivered", "status_code", "error"}
mista.webhooks.get()
mista.webhooks.set(url="https://example.com/webhooks/mista", rotate_secret=True)
mista.webhooks.delete()

Verify every request with the raw body before trusting it:

import os
from flask import Flask, request
from mista import WebhookVerificationError, verify_webhook

app = Flask(__name__)

@app.post("/webhooks/mista")
def mista_webhook():
    try:
        event = verify_webhook(request.get_data(), request.headers.get("Mista-Signature"), os.environ["MISTA_WEBHOOK_SECRET"])
    except WebhookVerificationError:
        return "", 400
    if event["type"] == "message.delivered":
        ...  # mark event["data"]["uid"] as delivered
    elif event["type"] == "message.failed":
        ...  # event["data"]["status"] is Undelivered | Expired | Rejected | Failed; reason in status_detail
    return "", 200

With FastAPI, pass await request.body(). verify_webhook checks the HMAC-SHA256 signature and rejects events older than 5 minutes (tolerance=seconds to change, 0 to disable). Answer with any 2xx within 10 seconds; otherwise Mista retries up to 5 more times over about 3 hours. Retries keep the same event["id"], so use it to ignore duplicates. You can also register the URL in the dashboard under Developers.

Errors

Every failure raises a subclass of mista.MistaError:

Exception	When
BadRequestError	400, e.g. an invalid phone number
AuthenticationError	401, missing or wrong token
PermissionDeniedError	403
NotFoundError	404
ValidationError	422; field problems are in error.errors
RateLimitError	429 after retries; see error.retry_after
ServerError	5xx
APIError	any other API error, including a 200 whose body says "status": "error" (e.g. a contact already in the group)
APIConnectionError / APITimeoutError	network failure or timeout

from mista import ValidationError

try:
    mista.sms.send(to="123", sender_id="YourBrand", message="Hi")
except ValidationError as error:
    for problem in error.errors:
        print(problem.field, problem.message)

All API errors carry status, body (the parsed response) and headers.

Retries, timeouts and HTTP client

mista = Mista(max_retries=2, timeout=30.0)

• 429 Too Many Requests is retried for every request, waiting for Retry-After.
• Network errors and 5xx responses are retried for GET only, so a send is never duplicated.
• max_retries=0 turns retries off.
• Pass http_client=httpx.Client(...) (or httpx.AsyncClient) for proxies or custom transports.
• Use the client as a context manager, or call close() / await aclose(), to release connections.

Not covered

The retired Push API.

Development

python -m venv .venv && .venv/bin/pip install -e ".[dev]"
.venv/bin/pytest && .venv/bin/mypy
MISTA_API_TOKEN=... .venv/bin/python scripts/smoke.py   # read-only: balance + account

License

MIT