Can AI agents automate Sinch?

Sinch communications APIs are automatable today through documented REST calls. This record is Conversation messaging, Voice, Verification, and Numbers. It is not Mailgun or Mailjet. Production requests use a short-lived OAuth 2.0 bearer token from https://auth.sinch.com/oauth2/token. The token request is HTTP Basic with the access key ID and key secret and grant_type=client_credentials. The documented example returns expires_in 3600, and the page says tokens are typically one hour. A Numbers example sends Authorization: Bearer to numbers.api.sinch.com. The Conversation getting-started guide also uses HTTP Basic with the same key pair for a test POST to https://us.conversation.api.sinch.com/v1/projects/{project}/messages:send, and it recommends OAuth for production. Inbound Conversation events are webhooks, at most five per app, created in the portal or by POST /webhooks. Official SDK material covers Node.js, Java, .NET, and Python. The sinch CLI (npm @sinch/cli) logs in with a project key pair, accepts SINCH_PROJECT_ID, SINCH_KEY_ID, and SINCH_KEY_SECRET in CI, and can send Conversation messages with --json. Sinch publishes a developer-preview MCP server as npm @sinch/mcp from github.com/sinch/sinch-mcp-server. Its tools send messages, place calls, start verification, and rent numbers. The same README lists Mailgun email tools, which stay on the Mailgun record. RCS must be enabled by contacting Sinch. The server runs locally or on a host you operate. Single-tenant HTTP mode does not authenticate callers. SMS and Voice pricing on the opened pricing page is pay-as-you-go. https://developers.sinch.com/llms.txt is a documentation map. Zapier, Make, Power Automate, and n8n were not opened. Computer-use viability is unassessed. The REST API scores 8 and is the best path. The CLI scores 7. The MCP preview scores 6.

Best path today: api · Overall automatability: 8/10