Load SendGrid data to DuckDB

Twilio SendGrid is a cloud-based email delivery service that provides a REST API for sending transactional emails, managing contacts, and monitoring email analytics. Everything needed to build a working SendGrid → DuckDB pipeline is on this page: the API's base URL, authentication, endpoints, pagination and incremental field — plus a prompt that hands the whole job to your coding agent.

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Build your SendGrid to DuckDB pipeline

Paste this prompt into Claude, Codex, or Cursor. The agent does the rest.

PromptCopy prompt
Run uvx dlthub-init@latest to build a pipeline from SendGrid to DuckDB and run it on dltHub

That scaffolds a dltHub workspace and installs the dltHub AI harness — the project rules, the secrets-management skill, and the dlt MCP server your agent needs to work safely. From there it reads the SendGrid API, proposes the endpoints to load, then writes, runs and validates the pipeline while you review rather than type. Credentials are inspected through MCP tools, so your agent never reads secrets.toml itself. How the LLM-native workflow works →

Prefer to write it yourself? Every fact the agent uses is below.

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SendGrid API at a glance

These values come from the SendGrid API reference — the authoritative source if anything here looks out of date.

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How do I authenticate with the SendGrid API?

Authenticate by including your API key in an Authorization header using the Bearer token format, formatted as 'Authorization: Bearer YOUR_API_KEY'.

1. Get your credentials

1. Sign in to your Twilio SendGrid account at https://app.sendgrid.com. 2. Navigate to Settings on the left navigation bar and select API Keys. 3. Click Create API Key. 4. Give the key a name and select the desired permissions (Full Access, Custom Access, or Billing Access). 5. Click Create & View. 6. Copy the generated API key immediately and store it securely; it will not be shown again.

2. Add them to .dlt/secrets.toml

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[sources.sendgrid_source]
api_key = "your_sendgrid_api_key_here"

dlt reads this file automatically at runtime. With the harness, the setup-secrets skill prompts you for the values and never handles the raw credential in chat. For production, see setting up credentials with dlt.

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What SendGrid data can I load into DuckDB?

These are the SendGrid endpoints dlt can load into DuckDB:

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How do I load only new SendGrid records?

The SendGrid API reference does not document a timestamp or sequence field for these endpoints, so there is nothing to advertise here as verified. Pick a field from the endpoints table above that increases with every write, then set it as the cursor_path.

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{"name": "marketing_lists", "endpoint": {
    "path": "v3/marketing/lists",
    # Replace with a field that increases on every write.
    "incremental": {"cursor_path": "REPLACE_ME", "initial_value": "2024-01-01T00:00:00Z"},
}}

On the first run dlt loads everything from initial_value; on every run after that it requests only what changed and appends with write_disposition="merge" if you set a primary key. See incremental loading.

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What does the generated SendGrid pipeline look like?

A standard dlt REST API pipeline — the same code you would write by hand, loading v3/suppression/blocks and v3/templates from the SendGrid API into DuckDB:

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import dlt
from dlt.sources.rest_api import RESTAPIConfig, rest_api_resources

@dlt.source
def sendgrid_source(api_key=dlt.secrets.value):
    config: RESTAPIConfig = {
        "client": {
            "base_url": "https://api.sendgrid.com/v3/",
            "auth": {"type": "bearer", "token": api_key},
        },
        "resources": [
            {"name": "marketing_lists", "endpoint": {"path": "v3/marketing/lists", "data_selector": "result"}},
            {"name": "transactional_templates", "endpoint": {"path": "v3/templates", "data_selector": "templates"}}
        ],
    }
    yield from rest_api_resources(config)


def load_sendgrid_to_duckdb() -> None:
    pipeline = dlt.pipeline(
        pipeline_name="sendgrid_pipeline",
        destination="duckdb",
        dataset_name="sendgrid_data",
    )
    load_info = pipeline.run(sendgrid_source())
    print(load_info)


if __name__ == "__main__":
    load_sendgrid_to_duckdb()

Run it with python sendgrid_pipeline.py. The agent iterates on this until it loads cleanly — you review and approve, rather than write it from scratch.

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How do I query SendGrid data in DuckDB?

dlt creates one table per resource. Query the loaded data with Python or SQL — or ask your agent to, through the MCP server's execute_sql_query tool.

Python (pandas DataFrame):

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import dlt

data = dlt.pipeline("sendgrid_pipeline").dataset()
df = data.marketing_lists.df()
print(df.head())

SQL:

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SELECT * FROM sendgrid_data.marketing_lists LIMIT 10;

See querying your data with dataset and exploring it in marimo notebooks.

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How do I deploy the SendGrid to DuckDB pipeline in production?

The pipeline runs locally, which is ideal for prototyping and one-off analysis. When you need it on a schedule, monitored on every load, and shared with your team, deploy the same dlt code on the dltHub platform — no infrastructure to maintain. The prompt above already ends with "run it on dltHub", so your agent can take it there directly.

• Deploy & schedule — run the pipeline as a managed job with automatic retries.
• Monitor — observable job queues, alerting, and load metrics for every run.
• Transform — promote raw SendGrid loads into governed, documented models.
• Visualize & share — explore data in notebooks and publish live dashboards instead of static screenshots.

Book a demo →

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What other destinations can I load SendGrid data to?

dlt loads into any of these — only the destination argument changes:

Set dlt.pipeline(destination="snowflake") and add credentials in .dlt/secrets.toml. On the dltHub platform the same pipeline runs against a managed Iceberg lakehouse. See the full destinations list.

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Next steps

• Ready for production? Book a demo of the dltHub platform →
• dlt LLM-native workflow docs
• REST API source reference
• Join the dlt community on Slack