Spica

https://blog.synthetix.io/the-spica-release/

• SIP-54 : Limit Orders
• SIP-65 : Decentralized circuit breaker
• SIP-69 : New Index Synths
• SIP-58 : Emit individual Reclaim and Rebate events
• SIP-44 : Settlement Improvements — Minor modifications to the settlement process for exchange rates deployments.
• SCCP-27 : Ether collateral second trial — Now that the first Ether collateral trial is complete, we will be launching a second trial that incorporates the collateralization ratio update from 150% to 125%.

Audit: https://iosiro.com/audits/synthetix-spica-release-smart-contract-audit

Antares

https://blog.synthetix.io/the-antares-release/

Implements most of SIP-71:

• Allow market creators to cancel a market if no bids have been placed on it yet
• Allow market creators to disable bid withdrawals at market creation
• Emit bid events for the initial capital at market creation
• Fix a bug that prevents creators from exercising their options before expiry under certain circumstances

Patch release: Reset iSynths iADA iDEFI iLINK

Unfroze and updated iADA iDEFI iLINK

Aldebaran

• SIP-66 Reduce gas of SNX transfers for non-stakers

• SCCP-31 Increase Commodity Fees

Acrux

https://blog.synthetix.io/the-acrux-release/

• SIP-48 Allow read views while rates are stale
• SIP-53 Binary options

Audit: https://iosiro.com/audits/synthetix-acrux-release-smart-contract-audit

Altair

https://blog.synthetix.io/the-altair-release/

• SIP-15 SNX liquidation mechanism
• SIP-56 Differential fees
• SIP-57 Address resolver proxy

Audit: https://iosiro.com/audits/synthetix-altair-release-smart-contract-audit

Patch release: Read Proxy for Address Resolver

Patch release for our new ReadProxy for the AddressResolver

Patch release: Inverse pricing update

Unfroze and updated iETH, iXTZ, iBNB and iLINK via 3499e7d

Also updated all testnet JSON files to no longer have sMKR and iMKR.

Hadar

https://blog.synthetix.io/the-hadar-release/

• SIP-9 One week claim window

• SIP-10 Improved Delegation Powers

• SIP-21 Deprecate swing fee

• SIP-44 System & Synth Disabling

• SIP-46 Address resolver gas optimizations

• SIP-47 Prevent empty exchanges

Audits:

1. https://iosiro.com/audits/synthetix-sip-44-and-sip-46-smart-contract-audit
2. https://github.com/sigp/public-audits/blob/master/synthetix/delegates/review.pdf

Alpha release of Hadar

Please Note: This is 2.21.0-alpha - it was incorrectly released as v2.21.0.