Free Trials for Private Telegram Channels: Building What the API Doesn't Give You

Start with the thing that shapes every decision here: Telegram's native Star subscriptions have no trial mechanism.

createChatSubscriptionInviteLink takes a subscription_price of 1–10,000 Stars. There is no trial period parameter, no introductory rate, no first-month-free flag. The minimum is one Star — a price, not a trial.

So any free trial is a thing you build on top, with your own timers and your own removal logic. That is entirely doable, and it has consequences worth understanding before you commit.

The structural problem

A trial is not just "access that expires." It is access that expires and then converts into a paid subscription.

On Telegram those are two unconnected mechanisms:

Trial access — an invite link you issue and later revoke, with removal you schedule
Paid access — a separate subscription link the user must actively subscribe through

Nothing joins them. There is no automatic trial-to-paid conversion. At the end of the trial the member must go and subscribe, exactly as if they had never trialled.

That is a real conversion cliff. On Stripe-based platforms the card is already captured and conversion is a default. Here it is an active decision by someone whose free access just ended — the worst possible moment to ask.

Plan for materially lower trial-to-paid conversion than you would expect elsewhere, and design the whole trial around making that final step trivial.

Two ways to build it

Option A — Timed invite link

Issue a link with expire_date, then schedule removal at trial end.

createChatInviteLink(chat_id, member_limit=1, expire_date=<now + 24h>)
# ... trial runs ...
banChatMember(chat_id, user_id)
unbanChatMember(chat_id, user_id, only_if_banned=True)
revokeChatInviteLink(chat_id, invite_link)

Simple, and it carries the hazards covered in invite link leaks: member_limit caps simultaneous members, so removing your trialist frees the slot and re-arms the link. Revoke on removal, always.

Option B — Join requests (better)

Set creates_join_request=True, approve each request yourself after checking eligibility.

You verify at the moment of approval — has this person trialled before? — which is exactly the check that makes trial abuse hard.

The constraint: the docs are explicit that with creates_join_request set, "member_limit can't be specified." The two are mutually exclusive. You give up the automatic cap and gain a decision point.

For trials, the decision point is worth more than the cap, because the whole problem is repeat trialists.

The abuse surface

Free trials on Telegram are easier to abuse than on card-based platforms, for one reason: there is no payment instrument to fingerprint. No card number, no billing address. Stripe can spot the same card trialling four times. You cannot.

What you have is a Telegram user ID.

What works:

Keep a permanent record of every trial by user ID. Never delete it. This is the single control that matters — without it every other measure is decoration.

Check on approval, not on issue. With join requests, look up the user ID before approving. Previously trialled → decline with a message pointing at the paid link.

Require an account with some history. Brand-new accounts joining minutes after creation are the common pattern. You cannot see account age directly, but a user with no username, no photo and no prior interaction with your bot deserves more scrutiny.

Require bot interaction first. Make the trial start in your bot rather than from a public link. It gives you a user ID before you grant anything, and it filters out drive-by joins.

Don't publish the trial link. A trial link in a public channel will be shared. Issue individually, one link per person.

What doesn't work:

Phone-number checks — bots cannot read a user's phone number unless the user explicitly shares it via a contact request, and someone determined to abuse a trial will happily share a second number.

IP or device checks — you have no access to either.

Shortening the trial — punishes honest users and barely inconveniences abusers.

Does a trial even make sense here?

Given no auto-conversion and a weak abuse surface, consider the alternatives before building one.

A free tier instead. A permanently free public channel with genuinely useful content, and a paid channel with the good stuff. No timers, no abuse problem, no conversion cliff, and it works as ongoing acquisition rather than a one-shot. For most Telegram channels this is simply better.

A very cheap first month. 1 Star is a legal subscription_price. It is not free, but it is close, and — crucially — it uses the native subscription, so it renews automatically at your real price when you create the next link. Wait: it does not. Price is fixed per link and cannot be edited, so a 1-Star link renews at 1 Star forever. Do not do this. It is the most expensive mistake available on this platform.

The workable version of "cheap first month" is a one-off discounted Stars purchase for month one, with the native subscription starting afterwards at full price. Two steps, but the pricing is correct and permanent.

Refund-backed access. Sell normally, offer a no-questions refund within 7 days. Stars refunds are entirely under your control via refundStarPayment and there are no chargebacks, so this is low-risk. It filters for intent — people who pay and can reclaim behave like customers, not trialists.

For most paid channels, a free tier or a refund guarantee beats a trial, and both are less work.

If you build a trial anyway

3–7 days. Long enough to see value, short enough to stay urgent.
Ask for the subscription on day one, not at expiry. "Subscribe now and your trial days are added on top" converts far better than a message sent as access dies.
Remind at the midpoint and the day before. Never let it end silently.
Make the final step one tap — a message containing the subscription link, nothing else.
Log every trial permanently, by user ID.
Warn before removing, and make rejoining easy. See grace periods.

The summary

Telegram gives you no trial primitive, no auto-conversion, and no payment instrument to fingerprint. A trial is therefore more work and converts worse than on a conventional subscription platform.

That is a genuine argument for not building one. A free channel that does acquisition continuously, or a refund guarantee that filters for real intent, will usually outperform a trial — and neither requires you to solve the repeat-trialist problem at all.

API constraints verified against Telegram's Bot API documentation, September 2026.