# Nylas Signatures API

**Canonical:** https://apis.io/apis/nylas/nylas-signatures-api/  
**Provider:** Nylas — https://apis.io/providers/nylas/  
**Base URL:** https://api.us.nylas.com  
**Documentation:** https://developer.nylas.com/docs/reference/api/applications/

Nylas Signatures API is one of 40 APIs that [Nylas](https://apis.io/providers/nylas/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Signatures. The published artifact set on APIs.io includes an OpenAPI specification, an API reference, API documentation, a getting-started guide, authentication docs, and rate-limit docs.

The Nylas Signatures API lets you create and store HTML email signatures on Nylas, and reference them by ID when sending messages or creating drafts. Nylas appends the signature to the end of the email body at send time. Nylas signatures are managed entirely through this API and are separate from any signatures configured in the user's email provider (Gmail, Outlook, etc.). Provider signatures are not synced to Nylas, and are not applied to emails sent through the Nylas API. Each grant supports up to 10 signatures, so users can maintain variants for different contexts (for example, "Work", "Personal", or "Mobile"). Signatures are automatically deleted when the parent grant is deleted. For more information, see the [Using email signatures](/docs/v3/email/signatures/) documentation.

## Operations (5)

| Method | Path | Summary |
|---|---|---|
| GET | `/v3/grants/{grant_id}/signatures` | Return all signatures |
| POST | `/v3/grants/{grant_id}/signatures` | Create a signature |
| GET | `/v3/grants/{grant_id}/signatures/{signature_id}` | Return a signature |
| PUT | `/v3/grants/{grant_id}/signatures/{signature_id}` | Update a signature |
| DELETE | `/v3/grants/{grant_id}/signatures/{signature_id}` | Delete a signature |

## Machine-readable artifacts (17)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/nylas/refs/heads/main/openapi/nylas-signatures-api-openapi.yml
- **APIReference** — https://developer.nylas.com/docs/reference/notifications/
- **Documentation** — https://developer.nylas.com/docs/v3/notifications/
- **Documentation** — https://developer.nylas.com/docs/
- **APIReference** — https://developer.nylas.com/docs/reference/api/
- **GettingStarted** — https://developer.nylas.com/docs/v3/getting-started/
- **Authentication** — https://developer.nylas.com/docs/v3/auth/
- **RateLimits** — https://developer.nylas.com/docs/dev-guide/platform/rate-limits/
- **ErrorCodes** — https://developer.nylas.com/docs/api/errors/
- **Pricing** — https://www.nylas.com/pricing/
- **Signup** — https://dashboard-v3.nylas.com/register
- **StatusPage** — https://status.nylas.com/
- **SDKs** — https://github.com/nylas/nylas-nodejs
- **SDKs** — https://github.com/nylas/nylas-python
- **SDKs** — https://github.com/nylas/nylas-ruby
- **SDKs** — https://github.com/nylas/nylas-java
- **APIReference** — https://developer.nylas.com/docs/reference/api/application-level-templates/

## Other Nylas APIs (12)

- [Nylas Contacts API](https://apis.io/apis/nylas/nylas-contacts-api/)
- [Nylas Drafts API](https://apis.io/apis/nylas/nylas-drafts-api/)
- [Nylas Events API](https://apis.io/apis/nylas/nylas-events-api/)
- [Nylas Messages API](https://apis.io/apis/nylas/nylas-messages-api/)
- [Nylas Threads API](https://apis.io/apis/nylas/nylas-threads-api/)
- [Nylas Notetaker API](https://apis.io/apis/nylas/nylas-notetaker-api/)
- [Nylas Amazon SNS Notifications API](https://apis.io/apis/nylas/nylas-amazon-sns-notifications-api/)
- [Nylas App migration API](https://apis.io/apis/nylas/nylas-app-migration-api/)
- [Nylas Application-level templates API](https://apis.io/apis/nylas/nylas-application-level-templates-api/)
- [Nylas Application-level workflows API](https://apis.io/apis/nylas/nylas-application-level-workflows-api/)
- [Nylas Applications API](https://apis.io/apis/nylas/nylas-applications-api/)
- [Nylas Attachments API](https://apis.io/apis/nylas/nylas-attachments-api/)

## Tags

Signatures

---

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