Email & Newsletter

Substack + Foldr Integration

Substack is the creator platform for paid newsletters and podcasts. Host large attachments (annual reports, research PDFs, extended audio) on Foldr and link from Substack — cheaper than Substack's media limits.

Substackvia Webhook

How to Connect Substack to Foldr

Create an inbound webhook in Substack

In Substack's webhook / automation settings, add a new webhook that fires on the event you care about.

Point the webhook at Foldr

Use https://foldr.space/api/v1/webhooks/ingest?token=<your-foldr-webhook-token> — Foldr accepts JSON bodies and deduplicates by source ID.

Add an outgoing Foldr webhook (optional)

If you want events to flow the other way (Foldr → Substack), add your Substack webhook URL to your Foldr workspace settings.

Common Use Cases

Host lead-magnet downloads on Foldr and deliver via Substack campaigns
Include Foldr short links in Substack emails for unified click tracking
Trigger Substack automations when a subscriber downloads a Foldr file
Run A/B tests on gated vs. open Foldr downloads in Substack

Substack + Foldr FAQ

How do I connect Foldr to Substack?

You connect Foldr to Substack via Webhook. Full steps are listed above under "How to Connect". In short: create a Foldr API key, configure the Webhook integration pointed at https://foldr.space/api/v1/, and map Substack's data into Foldr's request body.

Do I need a paid Foldr plan to use Substack with Foldr?

The Foldr free tier supports basic uploads via the API with 7-day expiry. For integration use with Substack — higher rate limits, permanent storage, multiple API keys, and webhook subscriptions — Foldr Pro (from $5/mo) is recommended.

What Foldr features can I call from Substack?

From Substack you can invoke any Foldr action: uploading files (up to 2 GB each), creating short links, generating bio pages, creating hosted forms, and reading download analytics. See the Foldr API docs for the full endpoint list.

Is there an official Foldr app for Substack?

Not a first-party app — Foldr integrates with Substack through Webhook, which is usually a better fit because it doesn't require installing an extra app. If you'd rather have a native integration, let us know at foldr.space/contact.