Bird vs Sinch

Bird vs Sinch for SMS

Sinch has two APIs that send SMS. Pick one, and the US registration you cannot skip still sits on a different host, in none of the SDKs they ship. Bird keeps sending, 10DLC registration and delivery events under one host and one key, and every one of them is a tool on a hosted MCP server your agent reaches the moment it connects.

Read the migration guideSee Bird SMS

By the numbers

Bird

SMS reach

150+ countries

Carrier routes

240 direct connections

Delivery speed

95% in under 2.5 seconds

What Sinch is great at.
Where Bird is different.

What Sinch is great at

Java and .NET, which Bird does not ship. Their unified SDK covers Node.js, Java, .NET and Python. A Java or .NET shop is better served there, and writes against Bird's HTTP API instead.

Delivery reporting you tune per batch. A batch picks its own delivery_report granularity and can override the service plan's callback URL for that send alone. Bird's events are a workspace-level subscription.

One vendor across a lot of channels. That same SDK also carries voice, numbers, verification, conversation, fax, number lookup and SIP trunking.

Where Bird is different

An agent operates the account itself. The hosted MCP server at mcp.bird.com gives an agent tools that send SMS, read delivery status back and register 10DLC brands against your real workspace, with nothing to install.

A retry that cannot double-send. An Idempotency-Key header on the send makes a repeat safe. Sinch documents no idempotency key on the batch send.

Message intent is a first-class field. Every free-text send carries a category of transactional, marketing, authentication or service, which the Sinch batch has no counterpart for.

The matrix

Capability by capability.

Sinch matches Bird on SDK count and gives finer per-batch control of delivery reports. Bird wins on one host for the whole channel, safe retries, message intent, and an agent surface any MCP client can reach. Read against the Bandwidth page, the one-host row is worth noting twice: Bandwidth splits the channel across two hosts, Sinch spreads it across three surfaces, and the row goes to Bird for a different reason each time.

CapabilityBirdSinchWho wins?
Send requestJSON to /v1/sms/messages on your regional host, with a bearer API key.JSON to a batches endpoint under your service plan's path, with a bearer token. The primitive is a batch, so to is an array and the text field is body.
Safe retriesAn Idempotency-Key header on the send makes a retry safe.No idempotency key is documented on the batch send, so a retry after a timeout can send twice. client_reference looks like one in a field list but is not: Sinch defines it as an identifier added to the batch's delivery report.
Message intentEvery free-text send carries a category of transactional, marketing, authentication or service.The batch has no field declaring a message's purpose. client_reference correlates and feedback_enabled asks for confirmation, and neither says why the message was sent.
Hosted MCP serverBring your own agent. mcp.bird.com is hosted, so Claude Code, Cursor, ChatGPT or your own runtime signs in once and operates the workspace with the same tools.Sinch publishes an MCP server and its tools do operate the account. It is an npm package each client spawns locally, configured per machine with six environment variables including a project key and secret.
A2P 10DLC registration/v1/sms/10dlc/* registers brands and campaigns over the API.Their Registration API registers brands and campaigns over an API, on its own host, and is not one of the products their unified SDK carries.
One host for the whole channelSending, 10DLC registration, and delivery events share a base URL and key.Two of their APIs send SMS, and the US registration you cannot skip is a third surface on a separate host.
Delivery eventsA workspace webhook subscribed to sms.*, delivered as JSON signed per Standard Webhooks.A service plan holds the default callback URL, and each batch can override it and choose one of five delivery_report granularities.
SDK languagesTyped SDKs for TypeScript, Python, Go, and PHP, plus Realtime clients for Swift, Kotlin, and the browser.A unified SDK for Node.js, Java, .NET, and Python.

The same send

The send call has a different primitive.

Sending one SMS. Sinch sends a batch, so the recipient is an array, the message text is body, and the payload nests inside sendSMSRequestBody. Bird returns a typed result you can destructure, and category is the field with no Sinch counterpart: every Bird free-text send declares its intent.

Sinch

send.ts
import { SinchClient } from "@sinch/sdk-core";

const sinch = new SinchClient({
  projectId: process.env.SINCH_PROJECT_ID!,
  keyId:     process.env.SINCH_KEY_ID!,
  keySecret: process.env.SINCH_KEY_SECRET!,
  smsRegion: "us",
});

const response = await sinch.sms.batches.send({
  sendSMSRequestBody: {
    from: "+15557654321",
    to:   ["+15551234567"],
    body: "Your table is ready.",
  },
});
console.log(response.id);

Bird

send.ts
import { BirdClient } from "@messagebird/sdk";

const bird = new BirdClient({ apiKey: process.env.BIRD_API_KEY! });

const { data, error } = await bird.sms
  .send({
    from:     "+15557654321",
    to:       "+15551234567",
    text:     "Your table is ready.",
    category: "transactional",
  })
  .safe();

if (error) console.error(error.message);
else console.log(data.id, data.status);

What does SMS cost per country?

Every destination country has a published rate on the SMS pricing page, and the carrier and 10DLC fees are itemised separately on SMS carrier fees rather than folded into it. You can price a campaign before you talk to anyone.

Switching cost

Low.

Three things change shape in the send. The service plan comes out of the URL path, the batch collapses to a single recipient, and body becomes text. Your callback URL becomes a workspace webhook subscribed to sms.*, and client_reference has a home in Bird's metadata.

One item is worth starting before the code. Sinch's own documentation says HTTP Basic on the Registration API "is intended for test purposes only" and is "heavily rate limited", and that "production systems should use OAuth access tokens instead" — so if your 10DLC registration runs through that path today, you already have a token lifecycle to retire rather than port. The registration itself is submitted again through Bird, and numbers you own are ported on support's schedule.

Read the migration guideSee the SMS surface

Questions people actually ask

Is Bird a good Sinch alternative for SMS?
For most application-to-person SMS, yes: Bird sends to 150+ countries over 240 direct-to-carrier connections, registers 10DLC brands and campaigns over the same API and key as the send, and makes retries safe with an Idempotency-Key header the Sinch batch send does not document. Sinch remains the better pick if you want a helper library in Java or .NET, if you need per-batch control over delivery-report granularity, or if you are buying voice, fax and SIP trunking from the same vendor.
How different is the send call?
The primitive differs more than the fields do. Sinch's send is a batch: the recipient is an array, the message text is body, and the request is keyed on a service plan in the URL path. Bird sends one message to one recipient with text, on a regional host with a bearer key. The two real additions on the Bird side are category, which declares whether a message is transactional, marketing, authentication or service, and the Idempotency-Key header that makes a retry safe.
Does Sinch have an MCP server?
Yes, and its tools do operate the account, so the difference is reach rather than capability. Sinch's is an npm package that each client spawns as a local process, configured per machine with six environment variables including a project key and secret. Bird's runs at mcp.bird.com, so any MCP client signs in over OAuth and gets the same tools without installing anything or putting production credentials in a local file.
Do Bird and Sinch both support A2P 10DLC registration over an API?
Both do, and this is where the two differ in shape rather than capability. Sinch's Registration API registers brands and campaigns on its own host, and it is not one of the eight products their unified SDK carries, so a codebase that uses the SDK to send drops to raw HTTP to register. Bird puts /v1/sms/10dlc/* beside /v1/sms/messages under one base URL and one key. Either way the registration goes to The Campaign Registry and does not transfer between providers.
What can the agent actually do in my account?
Exactly what you delegate to it, and no more. Signing in over browser OAuth opens a Bird consent screen where you choose workspace or organization permissions and select which of them to delegate. The grant is capped to the intersection of what the client requested, what you approved, and what you actually hold, and org:owner and platform-admin scopes are never delegable. The grant is listed in your profile's Connected apps, and revoking it there cuts the client off immediately.
What does Bird SMS cost per country?
Every destination country has a published outbound rate on Bird's SMS pricing page, with carrier and 10DLC fees itemised separately rather than folded into it, so you can cost a campaign yourself without a sales call.

Where to go next

The migration guide is the one to start with: it maps the move step by step.

Migrate SMS from another providerEnable destinations, set up a sender, map the send call, carry over opt-outs, and switch webhooks.Register a 10DLC brand and campaignWhat The Campaign Registry needs from a US sender, and the API that submits it for you.Bird for AI agentsThe hosted MCP server, the bird CLI, agent skills, and the Markdown twins behind every docs page.Bird vs Twilio for SMSThe same comparison against the API most teams are already on.

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