# Customer.io SMS API

**Canonical:** https://apis.io/apis/customer-io/customer-io-sms-api/  
**Provider:** Customer.io — https://apis.io/providers/customer-io/  
**Base URL:** https://track.customer.io  
**Documentation:** https://docs.customer.io/integrations/api/track/

Customer.io SMS API is one of 48 APIs that [Customer.io](https://apis.io/providers/customer-io/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 6 JSON Schema definitions. Tagged areas include SMS. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and 6 JSON Schemas.

Create and manage the SMS messages you write in Design Studio. These endpoints only work if your workspace writes SMS in Design Studio. Workspaces that set up SMS on or after July 30, 2026 do. If your workspace set up Twilio before July 30, 2026, it uses our original Twilio integration instead: you write each SMS in the workflow that sends it, and you can't use these endpoints. To check which one your workspace uses, go to Design Studio and click **Create**. If **SMS** is one of the options, you can use these endpoints. To organize your SMS into folders, use the [Folders](/integrations/api/design-studio/tag/folders/) endpoints.

## Operations (5)

| Method | Path | Summary |
|---|---|---|
| GET | `/v1/design_studio/sms` | List SMS |
| POST | `/v1/design_studio/sms` | Create an SMS |
| GET | `/v1/design_studio/sms/{id}` | Get an SMS |
| PUT | `/v1/design_studio/sms/{id}` | Update an SMS |
| DELETE | `/v1/design_studio/sms/{id}` | Delete an SMS |

## Machine-readable artifacts (10)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/openapi/customer-io-sms-api-openapi.yml
- **Documentation** — https://docs.customer.io/integrations/api/app/
- **Documentation** — https://docs.customer.io/integrations/data-in/connections/http-api/
- **Documentation** — https://docs.customer.io/integrations/api/customerio-apis/
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/json-schema/customer-io-campaign-object-schema.json
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/json-schema/customer-io-transformers-schema.json
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/json-schema/customer-io-campaign-request-schema.json
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/json-schema/customer-io-newsletter-object-schema.json
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/json-schema/customer-io-activity-object-schema.json
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/json-schema/customer-io-anonymous-events-request-schema.json

## Other Customer.io APIs (12)

- [Customer.io Track API](https://apis.io/apis/customer-io/track-api/)
- [Customer.io Activities API](https://apis.io/apis/customer-io/customer-io-activities-api/)
- [Customer.io Alias API](https://apis.io/apis/customer-io/customer-io-alias-api/)
- [Customer.io Batch API](https://apis.io/apis/customer-io/customer-io-batch-api/)
- [Customer.io Broadcasts API](https://apis.io/apis/customer-io/customer-io-broadcasts-api/)
- [Customer.io Collections API](https://apis.io/apis/customer-io/customer-io-collections-api/)
- [Customer.io Customers API](https://apis.io/apis/customer-io/customer-io-customers-api/)
- [Customer.io Exports API](https://apis.io/apis/customer-io/customer-io-exports-api/)
- [Customer.io Group API](https://apis.io/apis/customer-io/customer-io-group-api/)
- [Customer.io Identify API](https://apis.io/apis/customer-io/customer-io-identify-api/)
- [Customer.io Messages API](https://apis.io/apis/customer-io/customer-io-messages-api/)
- [Customer.io Newsletters API](https://apis.io/apis/customer-io/customer-io-newsletters-api/)

## Tags

SMS

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/customer-io/customer-io-sms-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/customer-io/.