Sinch SMS API

Best for: AI agents and automation - an agent-ready surface (MCP / llms.txt); Teams needing broad API coverage out of the box; Cost-sensitive teams - low, transparent entry price

Avoid if: You want to try it free before paying

• ███████▒░░
  75 / 100
  Agent friendliness
• ████████▒░
  85 / 100
  Pricing transparency
• ███████▒░░
  75 / 100
  Setup speed
• ██▒░░░░░░░
  25 / 100
  Docs quality
• ████████▒░
  85 / 100
  Procurement ease
• ██████████
  100 / 100
  Trust readiness

Scores are computed deterministically from this profile's published, sourced fields (pricing, compliance, capabilities, docs and developer-surface signals) - not from reviews or paid placement. Each axis is 0-100; an unknown signal scores 0 for that axis. Procurement ease is the inverse of buying friction (higher = easier to adopt).

Pricing model

Usage-based [2]sinch.com/pricing/“Our pay-as-you-go pricing for SMS offers the transparency, flexibility, and competitiveness you need to take your communications to the next level.”sinch.com/pricing/sms/“SMS Messaging ; 10DLC · Monthly fee. $1.00. Per month. Carrier fees apply ; Toll Free Numbers · Monthly fee. $2.00. Per month. Carrier fees apply”

Published pricing

✓ Yes [3]sinch.com/pricing/sms/“SMS Messaging ; 10DLC · Monthly fee. $1.00. Per month. Carrier fees apply ; Toll Free Numbers · Monthly fee. $2.00. Per month. Carrier fees apply”

Free tier

✗ No [4]sinch.com/pricing/sms/“SMS Messaging ; 10DLC · Monthly fee. $1.00. Per month. Carrier fees apply ; Toll Free Numbers · Monthly fee. $2.00. Per month. Carrier fees apply”sinch.com/messaging/sms-api/testing-sandbox/“Test SMS integrations in minutes with a free texting sandbox”sinch.com/pricing/“Our pay-as-you-go pricing for SMS offers the transparency, flexibility, and competitiveness you need to take your communications to the next level.”

Self-serve signup

✓ Yes [5]developers.sinch.com/docs/sms/getting-started“You need an API Token and Service Plan ID, which are used to authenticate calls when using the SMS API. These tokens are created automatically”

Requires sales call

✗ No [6]developers.sinch.com/docs/sms/getting-started“You need an API Token and Service Plan ID, which are used to authenticate calls when using the SMS API. These tokens are created automatically”

Enterprise plan

✗ No [7]sinch.com/pricing/sms/“SMS Messaging ; 10DLC · Monthly fee. $1.00. Per month. Carrier fees apply ; Toll Free Numbers · Monthly fee. $2.00. Per month. Carrier fees apply”sinch.com/engage/pricing/“Custom Enterprise Plans for high-volume senders. All the power of Engage, plus white-glove onboarding, 24/7 priority support, and flexible pricing.”

Supported actions

send_batch, list_batches, get_batch, update_batch, replace_batch, delete_batch, dry_run, send_delivery_feedback, list_delivery_reports, get_batch_delivery_report, get_recipient_delivery_report, list_groups, create_group, get_group, update_group, replace_group, delete_group, list_group_members, list_inbounds, get_inbound, receive_sms_webhook, delivery_report_webhook [8]developers.sinch.com/docs/sms/api-reference“The Sinch SMS REST API allows you to both send and receive SMS messages. If you are in the US region, you are also able to send and receive”developers.sinch.com/docs/sms/api-reference/sms/developers.sinch.com/docs/sms/api-reference/sms/delivery-reports“The REST API uses message statuses and error codes in delivery reports, which refer to the state of the batch and can be present in either Retrieve a delivery”

Regions

190+ countries worldwide, US (default server region) [9]sinch.com/messaging/sms-api/send-sms/“Scale with a single API to send SMS to 190+ countries.”developers.sinch.com/docs/sms/api-reference“If you are in the US region, you are also able to send and receive”

Input types

application/json, MSISDN phone numbers [10]developers.sinch.com/docs/sms/api-reference/sms/developers.sinch.com/docs/sms/api-reference“The Sinch SMS REST API allows you to both send and receive SMS messages.”

Output types

application/json [11]developers.sinch.com/docs/sms/api-reference/sms/

Webhooks

✓ Yes [12]developers.sinch.com/docs/sms/api-reference/sms/“deliveryreport”developers.sinch.com/docs/sms/api-reference/sms/webhooks/deliveryreport“A delivery report contains the status and status code for each recipient of a batch. To get a delivery report callback for a message or batch of messages, set”

Sandbox / test mode

✓ Yes [13]sinch.com/messaging/sms-api/testing-sandbox/“Test SMS integrations in minutes with a free texting sandbox”developers.sinch.com/docs/sms/getting-started“You need an API Token and Service Plan ID, which are used to authenticate calls when using the SMS API. These tokens are created automatically”

SDK languages

Node.js, Python, Java, .NET [14]developers.sinch.com/docs/sms/sdks“Sinch SDKs offer a consistent standardized framework for functionality to address problems like pagination, error code response and language”developers.sinch.com/docs/sms/getting-started/python/send-sms-sdk“Learn how to quickly send SMS messages in a Python application with the Sinch SMS API.”developers.sinch.com/docs/sdks/node“The Sinch Node.js SDK allows you to quickly interact with the suite of APIs from inside your Node.js applications.”developers.sinch.com/docs/sms/getting-started/dotnet-sdk/send-message“Set up your .NET application”

MCP server

✓ Yes [15]sinch.com/news/sinch-pioneers-next-generation-ai-communications-with-model-context-protocol-implementation/“Model Context Protocol provides a standardized way for AI agents to discover and execute actions across various systems and services.”github.com/sinch/sinch-mcp-server“This repository contains the source code for the Sinch MCP server, which provides a set of tools to interact with the Sinch APIs.”

SOC 2

SOC 2 Type II [16]trust.sinch.com“SOC 2 Type I”

HIPAA

✓ Yes [17]sinch.com/legal/policies-statements/other-sinch-policies-statements/hipaa/“Sinch has product level business associate agreements (BAA), which is an addendum to our standard Terms of Service.”

GDPR

✓ Yes [18]sinch.com/voice/security“Sinch Voice is GDPR and CCPA compliant and ISO 27001 certified.”trust.sinch.com“gdpr”

ISO 27001

✓ Yes [19]sinch.com/voice/security“Sinch Voice is GDPR and CCPA compliant and ISO 27001 certified.”trust.sinch.com“ISO 27001:2022”sinch.com/blog/building-trust-with-iso-27001-certification/“Sinch have been awarded ISO 27001 certification. Our voice, video, and operator software are now fully compliant with the standard.”

PCI DSS

✓ Yes [20]trust.sinch.com“pci”

Published SLA

✓ Yes [21]sinch.com/legal/terms-and-conditions/other-sinch-terms-conditions/messaging-service-level-agreement-sla/“Service availability means for the purpose of this SLA the percentage of time during which the Service is accessible and performing its intended functions.”

Rate limits

"Each service plan comes with a rate limit which sets the maximum number of messages that can be sent per second" [22]developers.sinch.com/docs/sms/resources/message-info/rate-limits“The rate limit is calculated from all messages sent via the API. For example, a batch with 10 recipients will count as 10 messages for rate”

Known restrictions

MMS is only available in the US region and requires contacting an account manager to enable, Messages over 160 characters are automatically concatenated, Default server location is US; other regions require contacting an account manager, Rate limits are dependent on your specific service plan, A batch with 10 recipients will count as 10 messages for rate limiting purposes [23]developers.sinch.com/docs/sms/api-reference“If you are in the US region, you are also able to send and receive”sinch.com/messaging/sms-api/send-sms/developers.sinch.com/docs/sms/resources/message-info/rate-limits“The rate limit is calculated from all messages sent via the API. For example, a batch with 10 recipients will count as 10 messages for rate”developers.sinch.com/docs/sms/resources/message-info/character-support“You can send up to 160 characters in a single SMS message if all characters in your message are part of the GSM 7-bit character set”

• Docs
• llms.txt
• Status page

Docs rendering: static · llms.txt present

API style

rest

Base URL

https://us.sms.api.sinch.com/xms/v1

Version

v1

Versioning

url

Stability

ga

Auth methods

api_key, basic

Error format

vendor-specific

Webhook signing

hmac_sha1

SDKs

• Node.js @sinch/sdk-core · repo
• Python sinch · repo
• Java com.sinch.sdk:sinch-sdk-java · repo
• .NET Sinch · repo

• Auth docs
• Quickstart
• MCP server
• Webhook events

Launched

2014-01-01

Notable customers

AAA, FirstBank, Florida Orthopaedic Institute, Omnisend

• Twilio Programmable Messaging

  One Messaging API to reliably reach 7B+ devices

  Usage · public pricing · self-serve

• Bird

  The global SMS API that scales with you

  Usage · public pricing · self-serve

• Telnyx SMS API

  Carrier-grade SMS API with direct routing. No aggregator markup, no middleman margin. Programmable messaging on infrastructure Telnyx owns end-to-end.

  Usage · public pricing · self-serve

• Infobip SMS API

  Send business text messages with a leading SMS service provider

  Usage · public pricing · self-serve

• Vonage SMS API

  Our SMS API helps you create customer journeys through conversations - even within the context of your app.

  Usage · public pricing · self-serve

• AWS End User Messaging

  AWS End User Messaging empowers developers to integrate scalable and reliable messaging capabilities into their applications. AWS End User Messaging helps you engage your customers by sending them SMS, voice messages, WhatsApp, and push notifications.

  Usage · free tier · public pricing · self-serve

Sinch SMS API alternatives · Sinch SMS API vs Twilio Programmable Messaging · All SMS APIs APIs

Each field above carries a numbered source - hover for a preview, click to jump here.

1. ↑Description: sinch.com
2. ↑Pricing model: sinch.com · sinch.com
3. ↑Published pricing: sinch.com
4. ↑Free tier: sinch.com · sinch.com · sinch.com
5. ↑Self-serve signup: developers.sinch.com
6. ↑Requires sales call: developers.sinch.com
7. ↑Enterprise plan: sinch.com · sinch.com
8. ↑Supported actions: developers.sinch.com · developers.sinch.com · developers.sinch.com
9. ↑Regions: sinch.com · developers.sinch.com
10. ↑Input types: developers.sinch.com · developers.sinch.com
11. ↑Output types: developers.sinch.com
12. ↑Webhooks: developers.sinch.com · developers.sinch.com
13. ↑Sandbox: sinch.com · developers.sinch.com
14. ↑SDK languages: developers.sinch.com · developers.sinch.com · developers.sinch.com · developers.sinch.com
15. ↑MCP server: sinch.com · github.com
16. ↑SOC 2: trust.sinch.com
17. ↑HIPAA: sinch.com
18. ↑GDPR: sinch.com · trust.sinch.com
19. ↑ISO 27001: sinch.com · trust.sinch.com · sinch.com
20. ↑PCI DSS: trust.sinch.com
21. ↑Published SLA: sinch.com
22. ↑Rate limits: developers.sinch.com
23. ↑Known restrictions: developers.sinch.com · sinch.com · developers.sinch.com · developers.sinch.com

Every field change, who made it, and when - from our audited data pipeline and editors.

1. 2026-06-15 Score Agent Friendliness: 40 → 75
2. 2026-06-15 Score Docs Quality: 15 → 25
3. 2026-06-15 Robots Allows Agents: (none) → Yes
4. 2026-06-15 Llms Txt Present: No → Yes
5. 2026-06-15 Has Structured Data: (none) → Yes
6. 2026-06-15 Llms Txt URL: (none) → https://docs.sinch.com/llms.txt
7. 2026-06-14 Score Docs Quality: 0 → 15
8. 2026-06-14 Rendering: (none) → static
9. 2026-06-14 Docs URL: (none) → https://docs.sinch.com
10. 2026-06-14 Status Page URL: (none) → https://status.sinch.com
11. 2026-06-14 Llms Txt Present: (none) → No
12. 2026-06-10 Last Verified At: 2026-06-06T00:00:00.000Z → 2026-06-10T00:00:00.000Z
13. 2026-06-10 Score Agent Friendliness: (none) → 40
14. 2026-06-10 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
15. 2026-06-10 Avoid If: (none) → You want to try it free before paying
16. 2026-06-10 Best For: (none) → AI agents and automation - an agent-ready surface (MCP / llms.txt), Teams needi…
17. 2026-06-10 Score Trust Readiness: (none) → 100
18. 2026-06-10 Score Procurement Friction: (none) → 85
19. 2026-06-10 Score Docs Quality: (none) → 0
20. 2026-06-10 Score Setup Speed: (none) → 75
21. 2026-06-10 Score Pricing Transparency: (none) → 85
22. 2026-06-10 Starting Price Usd: 0.0078 → 0.0078
23. 2026-06-10 SDK Packages: Node.js, Python, Java, .NET → Node.js, Python, Java, .NET
24. 2026-06-10 HIPAA: set to Yes
25. 2026-06-10 GDPR: set to Yes
26. 2026-06-10 ISO 27001: set to Yes
27. 2026-06-10 PCI DSS: set to Yes
28. 2026-06-10 SLA Published: set to Yes
29. 2026-06-10 SLA URL: set to https://sinch.com/legal/terms-and-conditions/other-sinch-terms-conditions/messa…
30. 2026-06-10 Documented Rate Limits: set to Each service plan comes with a rate limit which sets the maximum number of mess…
31. 2026-06-10 Rate Limit Window: set to second
32. 2026-06-10 Known Restrictions: set to MMS is only available in the US region and requires contacting an account manag…
33. 2026-06-10 Auth Methods: set to api_key, basic
34. 2026-06-10 Auth Docs URL: set to https://developers.sinch.com/docs/sms/api-reference#authentication
35. 2026-06-10 API Style: set to rest
36. 2026-06-10 Base URL: set to https://us.sms.api.sinch.com/xms/v1
37. 2026-06-10 API Version: set to v1
38. 2026-06-10 Versioning Scheme: set to url
39. 2026-06-10 Stability: set to ga
40. 2026-06-10 MCP URL: set to https://github.com/sinch/sinch-mcp-server
41. 2026-06-10 Quickstart URL: set to https://developers.sinch.com/docs/sms/getting-started
42. 2026-06-10 Error Format: set to vendor-specific
43. 2026-06-10 Webhook Signing: set to hmac_sha1
44. 2026-06-10 Webhook Events URL: set to https://developers.sinch.com/docs/sms/api-reference/sms/webhooks
45. 2026-06-10 Requires Verification: set to No
46. 2026-06-10 Starting Price Usd: set to 0.0078
47. 2026-06-10 Price Basis: set to message
48. 2026-06-10 Slug: set to sinch-sms
49. 2026-06-10 Notable Customers: set to AAA, FirstBank, Florida Orthopaedic Institute, Omnisend
50. 2026-06-10 Fields Not Found: set to ga_date, idempotency_supported, deprecation_policy_url, data_retention_policy_u…

This profile is crowd-editable - agents and humans can leave a review or propose a correction with a simple API call. No auth; requests are rate-limited and every submission is reviewed before it goes live. For a field edit, use any key from the Agent JSON in place of FIELD, and include a citation.

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