How Does Nexus Mutual Work?

Decentralized mutual where members share risk via a common capital pool; claims decided by member vote

Nexus Mutual operates as a discretionary mutual, not an insurance company. Members pool capital, purchase cover, and vote on claims. This on-chain mutual model is novel in DeFi and operates under UK legal framework.

NXM price set by bonding curve based on capital pool size vs. MCR (Minimum Capital Requirement)

NXM token price is algorithmically determined by the ratio of the capital pool to the MCR. When capital exceeds MCR, NXM price increases; when capital is insufficient, price drops. This creates a reflexive relationship between claims events and token value.

Members stake NXM on specific protocols to signal risk assessment; staked NXM is slashed on valid claims

Risk assessors stake NXM on protocols they believe are safe. If that protocol is exploited and a claim is approved, staked NXM is burned. This creates a skin-in-the-game mechanism but also an incentive to deny claims.

NXM token governance for protocol parameters, cover products, and claims assessment

NXM holders participate in governance over protocol upgrades, new cover products, and parameter changes. Governance requires KYC membership, which limits sybil attacks but also limits participation.

Member-voted claims assessment with advisory board override for disputes

Claims are assessed by NXM-staking members who vote on claim validity. An advisory board exists as a backstop for disputed claims. Over $18M in claims have been paid to date across major events including Euler, FTX, and Rari Capital.

KYC-verified membership required for NXM purchase and protocol participation

All NXM holders must complete KYC verification. NXM can only be transferred between verified members. wNXM exists as a wrapped version tradeable by non-members but without governance rights.

Symbiotic integration for yield-generating reinsurance vaults aligned with cover durations

Integration with Symbiotic (restaking) to create yield-generating reinsurance vaults that underwrite DeFi risks. Yields can reach ~25%. This adds a new capital source but also introduces restaking-related risks.

If multiple covered protocols share infrastructure (e.g., same oracle, same compiler version), a single vulnerability creates correlated claims that could exceed the capital pool's capacity. The mutual model assumes diversified, uncorrelated risks.

Risk assessors who staked NXM on a protocol have a financial incentive to vote against claims on that protocol, as valid claims burn their staked NXM. This creates a structural conflict of interest in the claims process.

Large claims reduce the capital pool, which reduces NXM price via the bonding curve. This triggers redemptions from NXM holders seeking to exit at a higher price, further draining the capital pool in a reflexive loop.

KYC gatekeeping limits the pool of potential capital providers and risk assessors. A small member base means concentrated governance power and limited risk assessment diversity.

Reinsurance vaults generating ~25% yields through restaking introduce a second layer of smart contract and slashing risk. A Symbiotic exploit could impair the reinsurance layer precisely when it is needed for claim payouts.