Is Capital One supported?

Yes. Capital One connects securely through Plaid, so you can link your accounts and start syncing in minutes.

How often does Capital One sync to the Redbark API?

API requests proxy live from Capital One at call time, and webhooks fire when new data reaches Redbark, within a few hours of a transaction posting.

Is my Capital One connection read-only?

Yes. Plaid connections are read-only. Redbark can read transactions and balances, and can never move money or change your Capital One accounts.

Does Redbark store my Capital One data?

No. Redbark uses a pass-through architecture: your Capital One transactions are proxied live to the Redbark API. We store consent records, encrypted tokens and minimal account metadata, never transaction amounts, descriptions or balances.

Is Redbark independently security tested?

Yes. Redbark was penetration tested in July 2026 by Project Black, a CREST-accredited Australian security firm, covering the web app, REST API, MCP server and admin console. The test returned zero critical and zero high-risk findings, and every finding raised was remediated and confirmed closed on retest.

How fresh is the Capital One data from the API?

Requests proxy live from Capital One via Plaid at call time. Webhooks fire when new Capital One data reaches Redbark, within a few hours of a transaction posting at your bank.

How are webhooks secured?

Every webhook payload is signed with an HMAC signature you verify against your signing secret, so you can confirm it genuinely came from Redbark.

United States · Developer API

Connect Capital One to the Redbark API

Pull Capital One transactions and balances over a clean REST API, or receive HMAC-signed webhooks as soon as new data reaches Redbark. Build your own app on live Capital One data over Plaid.

Connect Capital One free See pricing

No credit card required

Checking Account

Capital One

Savings Account

Capital One

Credit Card

Capital One

Your app

REST API + webhooks

SyncingLast synced: 2 min ago

Developer API

Your Capital One data, on tap for developers

Authenticate with an API key, request Capital One accounts, transactions and balances as JSON, and subscribe to HMAC-signed webhooks for push updates. Data is proxied live, nothing is warehoused.

Get started

Connect Capital One to the Redbark API in three steps

Connect Capital One

Link your Capital One accounts to Redbark through Plaid.

Create an API key

In Redbark, go to Settings → API & MCP and generate a key. Use it as a bearer token against api.redbark.com.

Read data or subscribe to webhooks

Fetch Capital One transactions as JSON on demand, or register a webhook endpoint to receive HMAC-signed events within hours of new transactions posting.