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Synci lets you fetch, transform, and transfer your banking and financial data anywhere. The API gives you programmatic access to everything the Synci dashboard can do: accounts, balances, transactions, investment holdings, bank connections, transfer links, rules, destinations, and webhooks.
The API is REST-based and served over HTTPS only. Requests and responses use JSON, except where noted (the OAuth token endpoint uses form encoding). Send an Accept: application/json header with every request.

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What you can build

Reporting and dashboards

Pull transactions, balances, and holdings across all of a user’s connected banks, brokerages, and crypto exchanges.

Automations

Trigger workflows from webhooks when new transactions arrive or balances change.

Integrations

Build an OAuth app so other Synci users can securely share their financial data with your product.

Embedded bank connections

Offer bank connections inside your own product to people who have no Synci account.

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Authentication at a glance

All requests are authenticated with a Bearer token:
There are two ways to get a token: See Authentication for details, Building OAuth apps for the full OAuth guide, and Managed apps if your users will never hold a Synci account of their own.

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Quick start

1

Generate a token

In the Synci dashboard, go to Developers → API tokens and create a personal access token. Copy it right away; it is shown only once.
2

List your accounts

3

Fetch transactions booked since June 1st

Every list endpoint pages, filters and sorts the same way. See Pagination, filtering, and sorting.

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Core resources

The full endpoint reference, with every path, parameter, and response schema and in-browser request testing, is under API reference.

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Guides

Authentication

Personal access tokens, OAuth tokens, and scopes.

Building OAuth apps

Register an app and implement the authorization flow.

Managed apps

Bank connections for users who have no Synci account.

Webhooks

Event types, payloads, signature verification, and retries.

Pagination, filtering, and sorting

How list endpoints work.

Errors

Response format and status codes.

Rate limits

Request limits and how to handle 429 responses.

MCP: Connect AI assistants

Give AI tools read-only access to your financial data.

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Versioning

The current API version is v1, and all documented endpoints live under /api/v1. We treat the following as non-breaking and may ship them without notice: adding new endpoints, adding new optional request parameters, adding new fields to responses, and adding new webhook event types (you only receive events you subscribe to). Breaking changes will be announced ahead of time.
A handful of endpoints have a reworked shape under /api/v2. Version 2 is in alpha and documented separately under API v2; everything not listed there is still served and documented under v1.

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Getting help