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Tag 126

Meaning

Tag 126 refers to the ‘ExpireTime’ field within the FIX (Financial Information eXchange) protocol, a widely used electronic communications protocol for international real-time exchange of securities transaction information. In crypto trading, especially for institutional RFQ platforms and automated smart trading, this tag specifies the precise time and date when an order or quote ceases to be valid, ensuring that stale or unexecutable instructions are automatically removed from the market.