Do the terms in the post caption legally bind all bidders who comment?

The caption as the auction's terms and conditions

In a formal auction house, bidders sign a registration form before bidding, explicitly accepting the auction terms. In a static post auction, no such signing ceremony occurs. The equivalent mechanism is the caption: it is publicly visible, it states the conditions on which the seller is conducting the auction, and any person who bids has seen or had the opportunity to see the caption before placing their bid. Courts and consumer forums apply the principle that publicly stated terms, where the participant had a reasonable opportunity to read them, bind the participant who chooses to engage.

The Indian Contract Act Section 7 requires that acceptance of a proposal must be absolute and unqualified. A bidder who bids on a lot where the caption states 'minimum increment ₹500, payment within 24 hours, no returns' has accepted the auction on those terms. They cannot later claim the 24-hour payment term was unreasonable if they saw the caption before bidding.

What the caption must contain to be legally effective

For the caption terms to bind bidders, they must be clearly stated and visible before bidding commences. Minimum effective caption terms for a static post auction: starting bid (SB) amount; minimum increment (also called bid slab); end time (with date and time zone if necessary); payment method and deadline; what constitutes a valid bid (e.g., must include amount only, or must tag the seller); and how the lot will be shipped.

Terms that are buried in comments posted hours into the auction, or that appear only after some bidding has already occurred, cannot bind early bidders who had no opportunity to see them. The caption at the time of the post is the binding document — subsequent changes to the caption may not bind bidders who already bid under the earlier version. Instagram notifies followers when captions are edited; Facebook may not. Sellers should finalize their caption terms before posting the lot.

The 'I didn't read the caption' defence

A bidder who claims they did not read the caption before bidding faces a weak legal position. The caption is the first and most visible element of any post — it is impossible to bid without having scrolled past or through the caption to reach the comment field. Consumer forums take a practical approach: a bidder who participated in a post auction is deemed to have had a reasonable opportunity to read the auction terms. The 'I didn't read' argument fails unless the terms were genuinely hidden, in a language the bidder could not understand, or changed after the bid was placed.

What the caption cannot do — limitations on seller-imposed terms

The caption can state how the auction works and what the terms of the transaction are. But it cannot override statutory rights. A caption that says 'by bidding you waive all consumer protection rights' is unenforceable — consumer rights under the Consumer Protection Act 2019 cannot be contractually waived. A caption that says 'all sales final, no refund even for misrepresented items' cannot override the buyer's right to seek a consumer forum remedy for deliberate misrepresentation. The caption defines the commercial terms; it does not displace applicable law.

Laws & authorities referenced in this chapter

Indian Contract Act 1872 — §7 (acceptance must be absolute; bidder accepts caption conditions by bidding)

Consumer Protection Act 2019 — §2(47)(r) (unfair contract terms; statutory consumer rights cannot be waived by caption)

IT Act 2000 — §10A (electronic acceptance of publicly stated terms has same legal validity as written acceptance)