Twilio SendGrid Legacy Marketing Campaigns Contacts API

Name: Twilio SendGrid Legacy Marketing Campaigns Contacts API API
Brand: Twilio SendGrid Legacy Marketing Campaigns Contacts API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentMarketingEmail Marketingbearer36 EndpointsREST

For Agents

Quickstart

Get started with Twilio SendGrid Legacy Marketing Campaigns Contacts API in minutes using your preferred integration method.

# Add to your MCP client config (Claude Desktop, Cursor, Windsurf)
{
  "jentic": {
    "url": "https://api.jentic.com/mcp",
    "auth": "oauth"
  }
}

# Then ask your agent:
"create a custom field"

# → Jentic returns the GET /events tool with parameter schema, agent executes.

Capabilities

What an agent can do with Twilio SendGrid Legacy Marketing Campaigns Contacts API API.

Create a Custom Field

Retrieve all custom fields

Delete a Custom Field

Query and filter Twilio SendGrid Legacy Marketing Campaigns Contacts API records by parameters

GET STARTED

Start building with Twilio SendGrid Legacy Marketing Campaigns Contacts API API

Explore with Jentic

View OpenAPI Document

Jentic publishes the only available OpenAPI document for Twilio SendGrid Legacy Marketing Campaigns Contacts API, keeping it validated and agent-ready.

The Twilio SendGrid Legacy Marketing Campaigns Contacts API allows you to manage your marketing contacts programmatically. This API is operational, but we recommend using the current version of Marketing Campaigns' [Contacts API](https://docs.sendgrid.com/api-reference/contacts/), [Lists API](https://docs.sendgrid.com/api-reference/lists/), and [Segments API](https://docs.sendgrid.com/api-referenc. The API exposes 36 endpoints secured with bearer authentication.

Use Cases

Patterns agents use Twilio SendGrid Legacy Marketing Campaigns Contacts API API for, with concrete tasks.

★ Marketing Operations

Use the Twilio SendGrid Legacy Marketing Campaigns Contacts API to perform marketing operations programmatically. The API provides 36 endpoints covering core functionality including create a custom field, retrieve all custom fields, retrieve a custom field.

Call POST /v3/contactdb/custom_fields to create a custom field

Automated Custom Fields Management

Automate custom fields operations by combining multiple Twilio SendGrid Legacy Marketing Campaigns Contacts API endpoints. Agents can retrieve all custom fields and then retrieve a custom field in a single workflow.

Call GET /v3/contactdb/custom_fields to retrieve all custom fields, then verify the result

AI Agent Integration via Jentic

AI agents discover and call Twilio SendGrid Legacy Marketing Campaigns Contacts API endpoints through Jentic without managing credentials directly. An agent searches for the required operation by intent, receives the matching endpoint schema, and executes the call with Jentic-managed authentication. This eliminates the need to read API documentation or handle bearer tokens manually.

Search Jentic for 'create a custom field', load the operation schema, and execute with Jentic-managed credentials

Key Endpoints

36 endpoints — the twilio sendgrid legacy marketing campaigns contacts api allows you to manage your marketing contacts programmatically.

METHOD

PATH

DESCRIPTION

POST

/v3/contactdb/custom_fields

Create a Custom Field

GET

/v3/contactdb/custom_fields

Retrieve all custom fields

GET

/v3/contactdb/custom_fields/{custom_field_id}

Retrieve a Custom Field

DELETE

/v3/contactdb/custom_fields/{custom_field_id}

Delete a Custom Field

POST

/v3/contactdb/lists

Create a List

GET

/v3/contactdb/lists

Retrieve all lists

DELETE

/v3/contactdb/lists

Delete Multiple lists

GET

/v3/contactdb/lists/{list_id}

Retrieve a single list

POST

/v3/contactdb/custom_fields

Create a Custom Field

GET

/v3/contactdb/custom_fields

Retrieve all custom fields

GET

/v3/contactdb/custom_fields/{custom_field_id}

Retrieve a Custom Field

DELETE

/v3/contactdb/custom_fields/{custom_field_id}

Delete a Custom Field

POST

/v3/contactdb/lists

Create a List

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Twilio SendGrid Legacy Marketing Campaigns Contacts API bearer credentials are stored encrypted in the Jentic vault (MAXsystem). Agents receive scoped access tokens — raw secrets never enter the agent context.

Intent-based discovery

Agents search by intent (e.g., 'create a custom field') and Jentic returns the matching Twilio SendGrid Legacy Marketing Campaigns Contacts API operation with its input schema, so the agent can call the right endpoint without browsing docs.

Time to first call

Direct Twilio SendGrid Legacy Marketing Campaigns Contacts API integration: 1-3 days for auth handling, response parsing, and error cases. Through Jentic: under 1 hour — search, load schema, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

Mailchimp

Alternative marketing API

Choose Mailchimp when you need a different approach to marketing operations

Alternative

Hubspot

Alternative marketing API

Choose Hubspot when you need a different approach to marketing operations

FAQs

Specific to using Twilio SendGrid Legacy Marketing Campaigns Contacts API API through Jentic.

What authentication does the Twilio SendGrid Legacy Marketing Campaigns Contacts API use?

The Twilio SendGrid Legacy Marketing Campaigns Contacts API uses a Bearer token in the Authorization header. Through Jentic, these credentials are stored encrypted in the MAXsystem vault and injected at execution time, so raw secrets never enter the agent context.

Can I create a custom field with the Twilio SendGrid Legacy Marketing Campaigns Contacts API?

Yes. Use the POST /v3/contactdb/custom_fields endpoint. The API returns structured JSON responses that agents can parse and act on directly.

What are the rate limits for the Twilio SendGrid Legacy Marketing Campaigns Contacts API?

Rate limits are not specified in the OpenAPI spec. Check the vendor documentation for current limits. Through Jentic, rate limiting is handled automatically with retry logic built into the execution layer.

How do I create a custom field through Jentic?

Install the Jentic SDK with pip install jentic, authenticate at https://app.jentic.com/sign-up, then search for 'create a custom field'. Jentic returns the matching Twilio SendGrid Legacy Marketing Campaigns Contacts API operation with its input schema. Load the schema and execute the call — credentials are injected automatically.

How many endpoints does the Twilio SendGrid Legacy Marketing Campaigns Contacts API have?

The Twilio SendGrid Legacy Marketing Campaigns Contacts API exposes 36 endpoints covering custom fields, lists, recipients operations.