Load Leap Wallet data to DuckDB

Leap Wallet is a browser and mobile wallet provider for Cosmos chains that offers an in-page injected provider for dApp connectivity and transaction signing. Everything needed to build a working Leap Wallet → 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.

---

Build your Leap Wallet 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 Leap Wallet 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 Leap Wallet 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.

---

Leap Wallet API at a glance

These values come from the Leap Wallet API reference — the authoritative source if anything here looks out of date.

---

How do I authenticate with the Leap Wallet API?

Leap Connect is an in-page provider accessed via the window.leap JavaScript object, which handles authentication through user-granted consent in the wallet UI; there is no REST API authentication via tokens or headers.

No credentials required. The Leap Wallet API is public, so there is nothing to obtain and nothing to add to .dlt/secrets.toml — the pipeline above runs as written.

---

What Leap Wallet data can I load into DuckDB?

These are the Leap Wallet endpoints dlt can load into DuckDB:

---

How do I load only new Leap Wallet records?

The Leap Wallet 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.

Copy
{"name": "fetch_balance", "endpoint": {
    "path": "cosmos/bank/v1beta1/balances/{address}",
    # 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.

---

What does the generated Leap Wallet pipeline look like?

A standard dlt REST API pipeline — the same code you would write by hand, loading getKey and connect from the Leap Wallet API into DuckDB:

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

@dlt.source
def leap_wallet_source():
    config: RESTAPIConfig = {
        "client": {
            "base_url": "N/A",
        },
        "resources": [
            {"name": "fetch_balance", "endpoint": {"path": "cosmos/bank/v1beta1/balances/{address}", "data_selector": "balances"}},
            {"name": "fetch_transactions", "endpoint": {"path": "cosmos/tx/v1beta1/txs", "data_selector": "txs"}}
        ],
    }
    yield from rest_api_resources(config)


def load_leap_wallet_to_duckdb() -> None:
    pipeline = dlt.pipeline(
        pipeline_name="leap_wallet_pipeline",
        destination="duckdb",
        dataset_name="leap_wallet_data",
    )
    load_info = pipeline.run(leap_wallet_source())
    print(load_info)


if __name__ == "__main__":
    load_leap_wallet_to_duckdb()

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

---

How do I query Leap Wallet 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):

Copy
import dlt

data = dlt.pipeline("leap_wallet_pipeline").dataset()
df = data.fetch_balance.df()
print(df.head())

SQL:

Copy
SELECT * FROM leap_wallet_data.fetch_balance LIMIT 10;

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

---

How do I deploy the Leap Wallet 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 Leap Wallet loads into governed, documented models.
• Visualize & share — explore data in notebooks and publish live dashboards instead of static screenshots.

Book a demo →

---

What other destinations can I load Leap Wallet 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.

---

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