Best SMS APIs for AI agents in 2026

For an AI agent that texts your customers, Unitpost ranks first: a hosted MCP server with OAuth whose SMS tools pass consent, STOP and quiet-hour checks on every call. Bird and Textmagic also host MCP servers that send; Telnyx's calls its API with a key; Twilio's hosted server only searches docs.

Updated November 2, 2026. We make Unitpost, and it is on this list. Every score has a reason and the weights are published below, so you can re-rank it for your own needs. How we scored

#	Product	Best for	US price	Score
1	Unitpost	apps that send email and SMS together	$0.014 per US segment, carrier fees included	4.8
2	Bird	the lowest US base rate	$0.0035 per US segment, plus carrier fees	4.4
3	Telnyx	low US rates with fees at cost	$0.004 per US segment, plus carrier fees at cost	4.0
4	Twilio	the widest choice of channels and countries	$0.0083 per US segment, plus carrier fees	3.4
5	Textmagic	business texting from a web app	$0.049 per US text	3.4
6	Sinch	global reach over direct carrier links	$0.0078 per US segment, plus carrier fees	2.7
7	Plivo	voice and SMS for larger teams	$0.0077 per US segment; SMS API on Enterprise from $1,000 a month	2.5

The picks

#1 · 4.8 / 5

Unitpost

Best for apps that send email and SMS together

SMS to 177 countries on the same API, contacts and bill as email, with consent records, STOP handling and quiet hours built in. Paid plans only.

Pros

Email and SMS on one API, contact list and bill
Consent records, STOP and HELP, and quiet hours built in
Carrier fees included in the US price
Hosted MCP server with SMS and consent tools

Cons

No free SMS: paid plans from $10 a month
No MMS, WhatsApp or number porting
Replies arrive in the US and Canada only

Free to try: No free SMS; paid plans from $10 a month
US price: $0.014 per US segment, carrier fees included
Priced by: Texts sent

Start free See pricing

#2 · 4.4 / 5

Bird

Best for the lowest US base rate

SMS, email and WhatsApp in one product, with the lowest US base rate here and a hosted MCP server with OAuth.

Pros

$0.0035 per US segment
Hosted MCP server with OAuth, including 10DLC tools
Email free up to 1,000 a month

Cons

Carrier and 10DLC fees on top of the base rate
No published country count

Free to try: Pay as you go; email free up to 1,000 a month
US price: $0.0035 per US segment, plus carrier fees
Priced by: Texts sent

Unitpost vs Bird Visit Bird

#3 · 4.0 / 5

Telnyx

Best for low US rates with fees at cost

A carrier-grade messaging API with a low US base rate and carrier fees passed through at cost. Its hosted MCP server can call the API.

Pros

$0.004 per US segment, carrier fees at cost
Hosted MCP server that calls the API
Numbers from $1 a month

Cons

The trial allows one verified number and 100 messages a day
10DLC fees on top of the base rate

Free to try: $5 test credit, one verified number
US price: $0.004 per US segment, plus carrier fees at cost
Priced by: Texts sent

Unitpost vs Telnyx Visit Telnyx

#4 · 3.4 / 5

Twilio

Best for the widest choice of channels and countries

The default messaging API, with SMS, MMS, WhatsApp and RCS in 180+ countries. Carrier fees are billed on top, and its hosted MCP server only searches docs.

Pros

180+ countries and every sender type
SMS, MMS, WhatsApp and RCS
A mature, widely documented API

Cons

Carrier fees and failed-message fees on top of $0.0083
The hosted MCP server is a read-only docs search in beta

Free to try: 30-day trial: 100 texts to up to 5 verified numbers, no card
US price: $0.0083 per US segment, plus carrier fees
Priced by: Texts sent

Unitpost vs Twilio Visit Twilio

#5 · 3.4 / 5

Textmagic

Best for business texting from a web app

A texting tool for businesses with a web app, email campaigns and a hosted MCP server, at a higher per-message price and in about 20 countries.

Pros

Hosted MCP server with browser sign-in that sends texts
Inbound texts are free
A web app for non-developers

Cons

$0.049 per US text
Business SMS in about 20 countries

Free to try: A trial with no card
US price: $0.049 per US text
Priced by: Texts sent

Visit Textmagic

#6 · 2.7 / 5

Sinch

Best for global reach over direct carrier links

A large carrier network with 190+ countries and SMS, RCS and WhatsApp through one Conversation API. Its MCP server is a local developer preview.

Pros

190+ countries and 600+ direct carrier connections
SMS, RCS and WhatsApp through one API
Trial credit with no card

Cons

Received texts cost the same as sent ones
Email is a separate product (Mailgun and Mailjet)
The MCP server is a local developer preview

Free to try: Trial credit, no card
US price: $0.0078 per US segment, plus carrier fees
Priced by: Texts sent

Unitpost vs Sinch Visit Sinch

#7 · 2.5 / 5

Plivo

Best for voice and SMS for larger teams

A voice and SMS platform with low list prices, though its pricing page puts the SMS API on an Enterprise plan from $1,000 a month.

Pros

$0.0077 per US segment list price
Numbers from $0.50 a month
$10 of free credit with no card

Cons

SMS API listed under Enterprise, from $1,000 a month
The hosted MCP server only searches docs
No email

Free to try: $10 free credit, no card; verified numbers only
US price: $0.0077 per US segment; SMS API on Enterprise from $1,000 a month
Priced by: Texts sent

Unitpost vs Plivo Visit Plivo

Scores side by side

Product	AI agents30%	Registration and consent25%	Developer experience20%	Email too15%	US price10%	Total
Unitpost	5	5	5	5	3	4.8
Bird	5	4	4	4	5	4.4
Telnyx	4	4	4	3	5	4.0
Twilio	2	4	5	3	3	3.4
Textmagic	5	3	3	3	1	3.4
Sinch	2	3	3	2	4	2.7
Plivo	2	3	4	1	2	2.5

How we scored

This list is for developers letting an AI agent send texts: reminders, order updates and replies to customers who opted in. What matters: an official MCP server that can send, consent and opt-out checks the agent can't skip, a clean API, and email in the same place.

AI agents (30%). An official MCP server or agent tooling that sends texts through the same checks as the API.
Registration and consent (25%). Help with 10DLC or toll-free registration, consent records and STOP handling built in.
Developer experience (20%). A clear REST API, current SDKs, readable errors and docs.
Email too (15%). Email in the same product, on the same contacts, key and bill.
US price (10%). The price of a US text, with carrier fees and number rental counted, at the entry tier.

Each product gets 1 to 5 per criterion, from its own pricing and docs pages. The total is the weighted mean, so changing a weight re-ranks the list.

Why Unitpost scored 4.8

AI agents: 5/5. A hosted MCP server with OAuth and SMS tools, consent tools included, behind the same checks as the API.
Registration and consent: 5/5. Consent on record per contact, STOP and HELP handling, quiet hours for marketing texts, and a content check before a sender's first send.
Developer experience: 5/5. The same REST API, nine SDKs and idempotency keys as email.
Email too: 5/5. Email and SMS share the API, contacts, key and monthly allowance.
US price: 3/5. $0.014 per US segment with carrier fees included: about Twilio's base rate plus fees.

Checked November 2, 2026 against unitpost.com/pricing, unitpost.com/sms, registry.npmjs.org/unitpost.

Why Bird scored 4.4

AI agents: 5/5. A hosted MCP server with OAuth, covering SMS, email, numbers and 10DLC.
Registration and consent: 4/5. STOP honored automatically in supported countries, and 10DLC tools in its API and MCP server.
Developer experience: 4/5. A modern API with idempotent retries.
Email too: 4/5. Email in the same product, free up to 1,000 a month.
US price: 5/5. $0.0035 per US segment, plus carrier fees.

Checked November 2, 2026 against bird.com/pricing/sms/us, bird.com/pricing/sms/fees, bird.com/docs/ai/mcp-server, bird.com/pricing/email, bird.com/email-api/features/sparkpost.

Why Telnyx scored 4.0

AI agents: 4/5. A hosted MCP server that calls the API, signed in with an API key.
Registration and consent: 4/5. 10DLC through the portal and API with fees at cost, and an LLM that detects opt-out replies.
Developer experience: 4/5. A clear API from a carrier-grade network.
Email too: 3/5. An email API since August 2026, newer than its messaging.
US price: 5/5. $0.004 per US segment, with carrier fees passed through at cost.

Checked November 2, 2026 against telnyx.com/pricing/messaging, developers.telnyx.com/docs/account-setup/levels-and-capabilities/trial, developers.telnyx.com/development/mcp/remote-mcp.

Why Twilio scored 3.4

AI agents: 2/5. The hosted MCP server is a read-only docs search in beta; an API server from Twilio Labs runs locally.
Registration and consent: 4/5. 10DLC registration through the console, API or ISV onboarding.
Developer experience: 5/5. A mature, widely documented messaging API with SDKs for most languages.
Email too: 3/5. Twilio Email went GA in May 2026; SendGrid remains a separate platform.
US price: 3/5. $0.0083 per US segment, plus carrier fees and a fee for failed messages.

Checked November 2, 2026 against twilio.com/en-us/sms/pricing/us, twilio.com/docs/messaging/guides/how-to-use-your-free-trial-account, twilio.com/docs/ai/mcp, twilio.com/en-us/changelog/twilio-email-ga.

Why Textmagic scored 3.4

AI agents: 5/5. A hosted MCP server with browser sign-in that sends and schedules texts.
Registration and consent: 3/5. 10DLC registration free at first, then $10 per campaign a month.
Developer experience: 3/5. An API alongside a web app built for non-developers.
Email too: 3/5. Email campaigns alongside SMS.
US price: 1/5. $0.049 per US text.

Checked November 2, 2026 against textmagic.com/sms-pricing/, textmagic.com/ai/, textmagic.com/blog/new-textmagic-features/.

Why Sinch scored 2.7

AI agents: 2/5. A local MCP server in developer preview.
Registration and consent: 3/5. 10DLC and toll-free supported; registration fees aren't published.
Developer experience: 3/5. SMS through the Conversation API, which spans channels and has more to learn.
Email too: 2/5. Email is Mailgun and Mailjet, separate products and accounts.
US price: 4/5. $0.0078 per US segment, plus carrier fees; received texts cost the same.

Checked November 2, 2026 against sinch.com/pricing/sms/, sinch.com/messaging/, github.com/sinch/sinch-mcp-server.

Why Plivo scored 2.5

AI agents: 2/5. The hosted MCP server only searches docs.
Registration and consent: 3/5. A 10DLC quickstart with published fees.
Developer experience: 4/5. A clear SMS API with SDKs.
Email too: 1/5. No email API, so receipts need a second provider.
US price: 2/5. $0.0077 per US segment list price, but the pricing page puts the SMS API on Enterprise from $1,000 a month.

Checked November 2, 2026 against plivo.com/pricing/, plivo.com/sms/pricing/us/, plivo.com/docs/faq/developer-tools/mcp-server.

Frequently asked questions

Can an AI agent send SMS marketing?

Only to people who gave express consent, recorded before the text, and never after they reply STOP. The agent should check consent on every send, and a person should approve anything sent to many people.

Which SMS providers have an official MCP server?

As of November 2026: Unitpost, Bird and Textmagic host servers that send texts; Telnyx hosts one that calls its API with a key; Twilio's and Plivo's hosted servers search docs; Sinch's is a local developer preview.

Go deeper: Unitpost MCP server · Best email APIs for AI agents · STOP and HELP for agent-sent texts · SMS reminders from an AI agent · 10DLC for AI-written texts

Start free

Start sending email your users actually receive

5,000 emails a month free — full API, SMTP relay, templates, tracking, and webhooks. Create a key, verify a domain, and send in minutes. No credit card.

Start for free Explore the docs