Tether, Chainalysis Freeze $4.5M in USDT After Mercado Bitcoin Security Breach
Tether has frozen over $4.5 million in USDT linked to a recent security incident at Brazilian crypto exchange Mercado Bitcoin.
Tether has frozen over $4.5 million in USDT linked to a recent security incident at Brazilian crypto exchange Mercado Bitcoin. Bitcoin (BTC) is trading at R$3.842.340 ($76,940.00), down 0.2% since this brief published. This is an original Kriptometre brief synthesising 4 outlets (Crypto.news, Unchained, Coinfomania, and others), with their figures cross-checked, plus live market data, as of Mon, 02 Nov 2026 20:07:02 UTC.
The incident highlights the growing role of stablecoin issuers and blockchain analytics firms in responding to crypto exchange security breaches, with potential implications for user trust and regulatory scrutiny.
- Mercado Bitcoin Halts Withdrawals Over Security Incident as Hypernative Flags $40 Million Drain ↗
- Tether freezes over $4.5m USDT linked to Mercado Bitcoin breach ↗
- Mercado Bitcoin Halts Withdrawals After Security Incident as Hypernative Flags $40M Outflows ↗
- Chainalysis Tracks Funds Linked to Mercado Bitcoin Security ↗
- Mercado Bitcoin suspended deposits/withdrawals after a November 2 security breach.
- Tether froze over $4.5 million USDT linked to the incident across Ethereum and Tron.
- Chainalysis is investigating to identify and freeze additional compromised funds.
- The breach resulted in $40 million in outflows according to security firm Hypernative.
Multiple outlets (Crypto.news, Unchained, Coinfomania, and CryptoPotato) confirm that Tether has frozen over $4.5 million in USDT connected to the Mercado Bitcoin security incident. They agree that the Brazilian exchange suspended operations after identifying suspicious activity on November 2. However, there are discrepancies in the reported outflow amounts, with Unchained and CryptoPotato citing $40 million based on Hypernative data, while other outlets do not specify the total loss. Additionally, Coinfomania emphasizes Chainalysis' involvement in the investigation, a detail not prominently featured in other coverage.
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- Tether, Chainalysis Freeze $4.5M in USDT After Mercado Bitcoin Security Breach — this brief
Tether has taken action to freeze over $4.5 million in USDT following a security breach at Brazilian cryptocurrency exchange Mercado 
Bitcoin. The incident occurred on November 2, prompting the exchange to temporarily halt both deposits and withdrawals while investigating the suspicious fund movements.
According to official statements from Mercado Bitcoin, the exchange assured its clients that no funds had been lost as a result of the breach. However, security firm Hypernative reported outflows exceeding $40 million from wallets associated with the exchange, indicating the potential scale of the incident.
Tether's Chief Technology Officer, Paolo Ardoino, announced the freezing of more than $4.5 million in USDT across both 
Ethereum and Tron blockchains. This action was taken in collaboration with blockchain analytics firm Chainalysis, which is actively investigating the incident to identify and freeze additional compromised funds.
The breach has raised concerns about the security measures employed by cryptocurrency exchanges, particularly in emerging markets. While Mercado Bitcoin has assured its users that their funds are safe, the incident underscores the vulnerabilities that exchanges face and the measures being taken by stablecoin issuers and blockchain analysts to mitigate the impact of such breaches.
In the broader market context, the total cryptocurrency market cap stands at $2.65 trillion, with Bitcoin currently trading at $77,063, down 1.07% in the last 24 hours. Tether (USDT), the third-largest cryptocurrency by market cap, is holding steady at $0.998925, showing minimal price movement despite the incident.
Since this brief published about 4 hours ago, Bitcoin (BTC) has moved from R$3.848.482,60$77,063.00 to R$3.842.340,05$76,940.00 — -0.16%.
The chart plots BTC's price: grey is the move before this brief published, the vertical dashed line marks the moment it published, the horizontal dashed line is the price then, and the coloured area is the move since — from Kriptometre's market data (daily resolution). It shows what happened after the news, not that the news caused it; many factors move prices. Yatırım tavsiyesi değildir.
Will Bitcoin reach $80,000 in November?
Crowd-implied probability on Polymarket, 17.94M ₺ 24h volume, resolves 1 Ara — snapshotted when this brief published (2 Kas 18:23 UTC). A market price reflects what traders collectively expect; it is not a forecast by Kriptometre and will have moved since. View the market ↗
At today's peer-to-peer rate, 1 BTC ≈ 3.96M ₺ (about $76,940.00), down 1.0% over 24 hours. The real itself trades about 3.1% above the official rate on the P2P market, so a Turkish buyer's effective cost differs from the headline dollar price.
Live market data
Current prices for the assets in this story — live, source-stamped, updated every 15 minutes.
1 key figure independently matched across 3 outlets reporting this story.
Kriptometre extracts the figures each outlet reports and flags the ones that agree. Numbers cited by only one outlet are attributed in the brief, not shown as corroborated.
Figures and sectors in this story, checked live against on-chain aggregators · 2 Kasım 2026.
Kriptometre reads these figures directly from on-chain aggregators (DeFiLlama, mempool.space) at build time — independent of what any outlet reported. Sector totals aggregate every protocol DeFiLlama tracks in that category. Values are live and will change.
Tether, Chainalysis Freeze $4.5M in USDT After Mercado Bitco — questions & answers
What is the current status of Mercado Bitcoin's operations?
Mercado Bitcoin has suspended deposits and withdrawals following the security breach.
How much USDT did Tether freeze in response to the incident?
Tether froze over $4.5 million in USDT linked to the Mercado Bitcoin breach.
What is the estimated financial impact of the breach?
Security firm Hypernative reports $40 million in outflows from wallets associated with Mercado Bitcoin.
How much is 1 Bitcoin worth in real today?
About 3.96M ₺ at the live peer-to-peer (P2P) USDT rate, which is what Turkishs typically trade at — equivalent to roughly $76,940.00. The real price moves with both BTC's US-dollar price and the USDT/BRL rate; use our Bitcoin in real page for any amount.
Has Bitcoin's price moved since this brief was published?
BTC is down 0.16% since this brief first published — trading at R$3.842.340 ($76,940.00) now versus R$3.848.483 ($77,063.00) at publication. Kriptometre re-checks this figure against CoinGecko and Binance every 15 minutes.
Which outlets reported this story?
This is an original Kriptometre brief that synthesises reporting from Crypto.news, Unchained, Coinfomania, CryptoPotato, with the key figures cross-checked for agreement across them. It is not a copy of any one article — follow the source links above for the original reporting.
Original summary — not financial advice. This is an original Kriptometre brief that summarises a development reported elsewhere and adds live market data for context; it is not the original article and reproduces no part of it. Follow the source link above for full details. Crypto is volatile and high-risk — always do your own research.