Precompiles

Fluent installs a fixed set of system precompiles at genesis. Each entry below is a callable address with a specific role: dispatching execution to a delegated runtime, verifying a cryptographic primitive, gating a privileged operation, or providing a standard EVM service. The constants come from fluentbase/crates/types/src/genesis.rs; the contract code that backs each address lives in fluentbase/contracts/<dir>/.

User contracts on Fluent — Solidity, Rust/Wasm, Universal Token — route their execution into one of the delegated runtime dispatchers below. Solidity and Universal Token contracts are stored as ownable accounts (0xEF44 magic prefix) that hold a pointer to the dispatcher plus runtime metadata; Wasm contracts are stored as compiled rWasm directly (0xEF52 magic prefix) after the executor's deploy-time rewrite. The dispatcher's address holds the runtime bytecode either way. See Runtime Routing and Ownable Accounts for the full mechanism.

Addresses are identical across testnet, mainnet, and devnet. Authority addresses default to the values shown below at genesis, but live networks rotate them — treat the defaults as starting points, not current values.

💡Tip

On-chain state for any precompile address can be inspected on Fluentscan. The protocol source-of-truth for these constants is fluentbase/crates/types/src/genesis.rs.

Delegated runtime dispatchers

Calls to these addresses are not handled by deployed bytecode at the address itself. They are dispatchers: the executor loads the runtime's code, runs it, and the call's storage domain stays at the caller's account. See Runtime Routing and Ownable Accounts for the mechanism.

Address	Description
0x0000000000000000000000000000000000520001	EVM runtime — see EVM Runtime
0x0000000000000000000000000000000000520003	SVM runtime — reserved, feature-gated, not currently active in mainnet build
0x0000000000000000000000000000000000520008	Universal Token runtime — see Universal Token Runtime
0x0000000000000000000000000000000000520009	WASM runtime — see WASM Runtime

Verifier precompiles

Reserved addresses for cryptographic verification primitives that have not yet been activated. Each address has stub bytecode installed at genesis but a call returns an unreachable-code error today. Documentation will follow activation.

Address	Description
0x0000000000000000000000000000000000520005	WebAuthn verifier — reserved, not yet active
0x0000000000000000000000000000000000520006	OAuth2 verifier — reserved, not yet active
0x0000000000000000000000000000000000520007	Nitro verifier — reserved, not yet active

System contracts

Privileged contracts that gate runtime upgrades, fee withdrawal, deterministic deployment, and cross-domain settlement. Each has a Solidity-style ABI and an authority owner.

Address	Description
0x0000000000000000000000000000000000520010	Runtime upgrade — replaces the bytecode of a delegated runtime. See Runtime Upgrade Precompile
0x0000000000000000000000000000000000520fee	Fee manager — withdraws accumulated protocol fees. See Fee Manager
0x9CAcf613fC29015893728563f423fD26dCdB8Ddc	Rollup bridge — cross-chain settlement. See Bridge Architecture
0x4e59b44847b379578588920cA78FbF26c0B4956C	CREATE2 factory — deterministic deployment proxy. See CREATE2 Factory

EIP-deployed system contracts

EIP-track precompiles deployed at protocol-specified addresses. Implementations live in fluentbase/contracts/ like the rest, but their addresses are dictated by the EIP, not by Fluent's 0x520xxx reservation range.

Address	Description
0x0000F90827F1C53a10cb7A02335B175320002935	EIP-2935 — historical block-hash ring buffer (Prague). See EIP-2935 Block Hash Service
0x0000000000000000000000000000000000000100	EIP-7951 — secp256r1 (P-256) signature verification. See secp256r1 Signature Verification

Standard EVM precompiles

Fluent ships every standard Ethereum precompile from 0x01 to 0x11 — ecrecover, sha256, ripemd160, identity, modular exponentiation, BN254 curve operations, BLAKE2 compression, KZG point evaluation, and the BLS12-381 family. See Standard EVM Precompiles for the full list and any Fluent-specific notes.

Authority addresses

Two privileged keys exist at genesis. Both default to 0xa7bf6a9168fe8a111307b7c94b8883fe02b30934 and are intended to be rotated immediately on a live chain (typically to a multisig). The defaults are documented for reference, not as current operational values.

• Runtime upgrade owner (constant DEFAULT_UPDATE_GENESIS_AUTH) — initial caller permitted to invoke upgradeTo on the Runtime Upgrade Precompile.
• Fee manager owner (constant DEFAULT_FEE_MANAGER_AUTH) — initial caller permitted to invoke withdraw on the Fee Manager.

Both contracts read their stored owner first and only fall back to the default when the slot is zero. The constants live in fluentbase/crates/types/src/genesis.rs.

Bytecode model

Every account on Fluent stores its code as one of four Bytecode variants. Knowing which variant a contract uses determines whether metadata syscalls work, whether REVM dispatches through an owner address, and what the leading bytes of account.code look like.

Variant	Magic prefix	Used by
LegacyAnalyzed	(no Fluent magic)	Plain analyzed EVM bytecode (legacy chain accounts).
Eip7702	0xEF01	EIP-7702 account-code delegation (EOAs that delegate to a contract).
OwnableAccount	0xEF44	Solidity contracts (owner = EVM Runtime), Universal Token contracts (owner = UT Runtime), and the EVM-style system precompiles.
Rwasm	0xEF52	Wasm contracts (after the deploy-time wrapper rewrite), and system contracts pre-deployed at genesis as raw rWasm (Runtime Upgrade, Fee Manager, EIP-2935, secp256r1, etc.).

OwnableAccount carries owner_address plus runtime-specific metadata bytes; the runtime is dispatched through on every call. Rwasm accounts execute their bytes directly with no owner-address indirection.

Magic bytes reference

Constant	Value	Module
WASM_MAGIC_BYTES	0x0061736d (standard \0asm)	crates/types/src/lib.rs
UNIVERSAL_TOKEN_MAGIC_BYTES	0x45524320 ("ERC ")	crates/types/src/lib.rs
RWASM_MAGIC_BYTES	0xef52	revm-bytecode/.../rwasm.rs
OWNABLE_ACCOUNT_MAGIC_BYTES	0xef44	revm-bytecode/.../ownable_account.rs
EIP7702_MAGIC_BYTES	0xef01	revm-bytecode/.../eip7702.rs