Mercury + n8n: The Complete Integration Guide
Connect Mercury to n8n to monitor transactions and route approvals. Setup, triggers, actions, and production patterns.
Key takeaways
- Mercury authenticates with n8n via OAuth or API key — pick OAuth for user-facing flows and API key for service accounts.
- Triggers (webhooks and polling) start workflows on Mercury events; actions call Mercury from any other workflow.
- Use the HTTP Request node to reach Mercury endpoints the built-in node doesn't cover yet — the auth is reused.
- Rate limits, retries, and idempotency are the three biggest Mercury production gotchas — handle them explicitly.
Mercury is one of the most-used startup banking platforms — and n8n is the fastest way to wire it into the rest of your stack without writing glue code. In this guide you'll set up authentication, pick the right triggers, and learn how teams use the Mercury node in production to monitor transactions and route approvals.
Connecting Mercury to n8n
Open Credentials in n8n and create a new Mercury credential. Choose OAuth when a human should authorize on their own account, or an API key / access token for background workflows owned by an operations account. Store the client ID and secret from the Mercury developer console; n8n handles the callback and refresh tokens automatically.
After the credential is saved, add a Mercury node to any workflow and select the credential. Test the connection with a read-only action (list, get, or search) before wiring writes — a green execution proves the scopes are right.
- Grant only the minimum Mercury scopes your workflow needs.
- Use one credential per environment (dev, stage, prod) and never share across projects.
- Rotate keys quarterly and immediately after any contractor offboards.
Triggers and actions
The Mercury Trigger node starts a workflow when something happens in Mercury — a new record, a status change, an inbound message, or a webhook event. Prefer webhooks over polling when Mercury supports them; polling burns credits and adds latency.
Actions run from any node position and let you monitor transactions and route approvals. Chain them with Set, If, and Merge nodes to build the exact business rule you need without touching code.
Production patterns for Mercury
Wrap every Mercury write in retries with exponential backoff — the API will throw 429s during traffic spikes and you don't want to lose events. Add a dedupe step (Redis SETNX or a Postgres unique index) so a retried webhook doesn't create duplicate records.
For high-volume workflows, run n8n in queue mode with a Redis broker and separate workers. That way Mercury throughput stops fighting with your other automations for the same CPU.
- Verify webhook signatures — never trust the payload alone.
- Log the full {name} response on failure so you can replay it later.
- Alert on 5xx rates, not just outages — silent degradation is the real killer.
Frequently asked questions
- Is there an official Mercury node in n8n?
- Yes. n8n ships a first-party Mercury node with common triggers and actions; use the HTTP Request node for endpoints the built-in node doesn't cover yet.
- OAuth or API key for Mercury?
- OAuth for user-owned data, API key or service account for background workflows. Never share personal OAuth tokens across a team.
- How do I handle Mercury rate limits?
- Add a Wait node between calls, use Split In Batches to control concurrency, and enable retries with exponential backoff at the node level.
- Can I self-host n8n and still use Mercury?
- Yes — the same node works self-hosted. Make sure your n8n instance is reachable from the internet if you need inbound webhooks from {name}.