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ActionSupabaseUpdated September 2026

How do I call a Postgres function in Supabase?

Short answer: You can call function (rpc) in Supabase by hand from its own interface, but it won’t repeat itself. On TinyCommand, add the Supabase Call Function (RPC) action to a workflow, map its 2 inputs from any upstream app, and it runs automatically every time the trigger fires. No code, and a free tier to start.

Call Function (RPC) in Supabase — start free All 7 Supabase actions
Call Function (RPC) in Supabase — start free
Inputs

The fields this action accepts.

Every field can be mapped from an upstream trigger, AI step, table row, or hard-coded literal.

FieldTypeRequiredDescription
Function Name
function_name
stringRequiredFunction Name. Example: get_user_stats
Parameters (JSON)
params
stringOptionalJSON object of function arguments
Sample request
{
  "function_name": "e.g. get_user_stats",
  "params": "{\"user_id\": 123}"
}
Returns
{
  "total_orders": 42,
  "total_revenue": 1234.56
}

Use these fields in downstream nodes for routing, logging, or error handling.

Triggered by

Apps that pair well as the trigger for Call Function (RPC).

Any of these apps can fire this action as part of a workflow.

Gmail → Supabase
1 Gmail triggers
Slack → Supabase
13 Slack triggers
Google Sheets → Supabase
2 Google Sheets triggers
HubSpot → Supabase
18 HubSpot triggers
FAQ

Questions about Call Function (RPC).

What does the Call Function (RPC) action do in Supabase?
Calls a Postgres function (RPC) defined in your Supabase database with the supplied JSON arguments. The escape hatch when typed table operations don't express the business logic you need.
What inputs does Call Function (RPC) require?
Required: Function Name. Every input accepts a static value or a variable from any upstream node in your workflow.
Can I use dynamic inputs from earlier workflow nodes?
Yes. Any field on this action can pull values from upstream nodes, whether that's a form response, a trigger payload, an AI output, or a lookup result.
What happens if Supabase returns an error?
The run history shows the failed step with its input and the error message Supabase returned, so you can fix the input and run the workflow again. Automatic retries are built into HTTP steps only, where you can also set your own retry count and delay.
Does Call Function (RPC) support batch operations?
Run Call Function (RPC) inside a loop to process each item in an array. TinyCommand does not throttle calls for you, so for large arrays add a Delay step if you need to stay within Supabase's rate limits.
More actions

Other Supabase actions.

Action
Delete Rows
Deletes rows from a Supabase table that match a filter (eq, neq, gt, in, like, etc.). PostgREST requires at least one filter, so empty filters are rejected as a safety guard.
Action
Insert Row
Inserts a new row into a Supabase table with the supplied field values. Respects table RLS policies based on the API key in use.
Action
Select Rows
Selects rows from a Supabase table with optional filters, order, and limit. Supports joined selects via the PostgREST embed syntax (e.g. *, author(name)).
Action
List Tables
Lists all tables in a Supabase database (from the public schema) with their column metadata. Used to dynamically populate table pickers and column dropdowns.
Action
Update Rows
Updates rows in a Supabase table that match a filter. PostgREST requires at least one filter, so empty filters are rejected to prevent accidental table-wide updates.
Action
Upsert Row
Inserts a row, or updates it if a conflict occurs on the primary key or a unique constraint. The right tool for idempotent sync flows from another source-of-truth system.
Call Function (RPC) in Supabase — start free