Proofsource and Cal.com: open scheduling meets the fix loop
Paste a member's Cal.com API key and Proofsource reads that person's busy times and creates call invites from their own Cal.com account. Replies to prospects can offer slots that are truly open and book one in the same step, so a scan finding turns into a conversation without a scheduling thread.
Proofsource and Cal.com, in short
The facts, ready to quote.
- Stage
- Live for agency workspaces
- Connects with
- The member's Cal.com API key, pasted in Settings, Email and calendar
- Access it needs
- Whatever that API key allows: reading availability and creating bookings
- Where it shows
- Settings, Email and calendar, in the Calendar section
- Choice
- A member uses Cal.com or Google Calendar, whichever they already run
- Disconnect
- Remove the key in Settings, or delete it in Cal.com to cut access at the source
Live Live applies to agency workspaces, where each member connects their own calendar. The connection belongs to the team member who pastes the key.
Why we love Cal.com
In the makers' own words, from their own pages. Proofsource builds on it, never around it.
Open source, and yours to host
Cal.com is open source with code on GitHub, and it offers self-hosting, so teams can run scheduling the way their own security and data rules demand.
From cal.comRouting and round robin for real teams
It offers round-robin distribution and attribute-based lead routing, which suits sales and support teams that need the right person on each call.
From cal.comAn API built for developers
The Cal.com API manages event types, schedules and bookings, and supports OAuth and API keys sent as a bearer token, so connecting a tool is straightforward.
From cal.comHow Proofsource uses Cal.com
Reads a member's busy times and creates call invites from their own Cal.com account, for agency workspaces.
- Connect
Paste the member's API key
The key stays with that member's connection. Proofsource uses it only for availability and call invites.
- Read
See their busy times
Proofsource reads when the member is busy, so a reply can offer slots that are really open.
- Ship
Create the invite
When the member approves a reply with an invite, Proofsource creates the call from their own Cal.com account.
- Prove
Move the prospect on
A booked call advances the prospect in the agency pipeline, ready for the walkthrough of their visibility report.
Set up Cal.com in 4 steps
Create an API key in Cal.com
In your Cal.com settings, create a key for Proofsource. Give it only what you are comfortable sharing.
Open Settings, Email and calendar
Find the Calendar section and choose Cal.com.
Paste the key
Each member pastes their own key. Proofsource checks it works before saving it.
Send an invite from a reply
Approve a reply with a call invite from the agency Inbox. You can remove the key from Proofsource any time and delete it in Cal.com too.
Thanks for the report, Sam. I can walk you through the three fixes on Tuesday at 15:00 or Wednesday at 09:30.
| Slot | Status |
|---|---|
| Tue 15:00 | Open |
| Wed 09:30 | Open |
| Wed 11:00 | Busy |
What you unlock with Cal.com
Real availability
Offer slots that are open on the member's own Cal.com.
Reply and book
Send the answer and create the call in one step.
Your key, your control
Remove it in Proofsource or revoke it in Cal.com whenever you like.
Fewer scheduling emails
A finding becomes a booked call without a long thread.
Per member
Every team member uses their own account and their own calendar.
Pick your tool
Use Cal.com or Google Calendar, whichever your team already trusts.
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Questions about Proofsource and Cal.com
What does Proofsource do with Cal.com?
It reads a member's busy times and creates call invites from their own Cal.com account when they approve a reply with an invite in the agency Inbox.
What access does it need?
The member's Cal.com API key. Proofsource uses it for availability and for creating call invites, and for nothing else.
How do I disconnect?
Remove the key in Settings, Email and calendar. For good measure you can also delete the key in your Cal.com settings, which cuts off access at the source.
Who can use this?
Agency workspaces, where each member connects their own calendar. It is not offered to brand workspaces that are not agencies.
What does Live mean?
You can connect it today. It is not a preview or a waiting list.
How does this help AI visibility?
It makes it quicker to move from showing a prospect where ChatGPT, Perplexity, Claude and the other engines leave them out to a call where you plan the fix.
Can I use Cal.com and Google Calendar together?
A member connects whichever one they use. Both sit in the Calendar section of Settings, Email and calendar.
Pairs well with Cal.com
Put Cal.com to work for your AI visibility.
Scan your brand, connect Cal.com, and see what AI says about you on up to 10 engines.
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