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Sundial Protocol is a Bitcoin-native yield platform built on the Sundial L2, an optimistic rollup that boasts impressive throughput and fast finality without compromising on security. You stake real BTC, earn real yield, and interact with a high-throughput L2 capable of processing 2,000 to 5,000 transactions per second, all without a new governance token. Sundial uses wrapped BTC as its unit of account throughout, so your returns are always denominated in Bitcoin.

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Why Sundial

Most DeFi yield platforms require you to bridge into an unfamiliar token ecosystem and trust centralized custodians. Sundial takes a different approach: your BTC is locked by audited on-chain scripts, secured by cryptographic fraud proofs, and settled on a battle-tested Ouroboros consensus L1. The result is a yield product that stays Bitcoin-native from deposit to payout.

Quickstart

Connect your wallet, claim testnet tokens, and make your first stake in under 5 minutes.

Testnet Guide

Everything you need to use the Sundial testnet: wallets, faucet, network details, and the CLI tool.

Architecture

Understand the full Sundial stack: the L2, bridge integrations, and the Yield Marketplace.

API Overview

Explore the node HTTP RPC surface, TypeScript SDK, and BTC Locker SDK reference.

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The Three Pillars

Sundial is composed of three interconnected pillars that work together to move BTC into yield-bearing positions entirely on-chain.
The Sundial L2 is an optimistic rollup that settles deterministically to the L1. It targets 2,000 to 5,000 TPS with fraud-proof security, using the same Plutus VM as the L1. This isomorphism means L1 smart contracts can run on L2 with no rewrite, and developers can formally verify their applications using standard tooling. Block headers are committed to the L1 state queue; full block data is published to the L1 data-availability layer (Leios).
Sundial integrates trust-minimized bridges that connect Bitcoin directly to the L2 without custodians or multisig federations. Charms verifies Groth16 zk-SNARK proofs on-chain for permissionless cross-chain transfers. Additional trustless bridges (**Pogun **with MuSig2 + BitVMX, and FluidTokens) round out the bridge layer. Unlocking assets back to Bitcoin uses Mithril threshold signatures for an additional layer of cryptographic security.
On top of the L2, Sundial exposes a marketplace of yield products powered by shared liquidity pools and structured reserve assets:
  • BTC Locker accepts native Bitcoin through a four-transaction staking flow (Deposit → Claim → Distribute → Withdraw) governed entirely by P2WSH timelock and escrow scripts.
  • Alchemy creates two structured reserve assets from BTC collateral: FIRE (a high-beta BTC growth token) and ICE (a senior BTC-backed USD claim).
  • Solstice (coming soon) is a Bitcoin-native yield vault: BTC in, receipt tokens out, with yield expressed through a rising claim ratio priced from a single system-wide BTC-per-RT source of truth. Atomic BTC-in and RT-out settlement and proof-of-reserves gating protect backing integrity.
Together they give you precise control over your risk and return profile without leaving the Bitcoin ecosystem.

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Who Sundial Is For

Sundial serves three distinct groups, each with a tailored experience.
If you hold BTC or ADA and want to put it to work, Sundial’s dashboard is the starting point. You connect a supported wallet, choose a staking position, and track your yield in the portfolio tab, no command line required.Supported L1 wallets: Eternl, Lace, Typhon, Yoroi, GeroWallet, NuFiSupported Bitcoin wallets: Any wallet compatible with Reown AppKitStart with the Quickstart to make your first testnet stake.

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Security

Sundial’s security model is grounded in cryptography, not trust.

Hacken Audited

Sundial’s smart contracts have been independently audited by Hacken with 0 critical and 0 high findings. All 11 findings identified have been resolved.

Fraud-Proof Protected

The Sundial L2 uses an optimistic rollup model with on-chain fraud proofs. Any invalid block committed by an operator can be challenged and invalidated by a Prover Watcher, with no trust in the operator required.

Open Source

All Sundial smart contracts, the node, and the SDKs are released under the Apache 2.0 license. You can read, audit, and fork the code at any time.
The current testnet deployment runs against placeholder validators for development purposes. On-chain fraud-proof enforcement is active on the production network. Never point real funds at testnet addresses.