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ERC-8121 Cross-Chain Function Calls via Hooks

DraftERCcreated 2025-12-12requires ERC-3668, ERC-7930

A specification for cross-chain function calls using hooks with ERC-7930 interoperable addresses.

Author: Prem Makeig (@nxt3d)

Functions this standard introduces (2)

0x037f43edhook(bytes4,string,string,string,bytes)
0x6113bfa3hook(string,string,string,bytes)

Depends on (2)

Proposals this one names in its requires field.

ERC-3668CCIP Read—Secure offchain data retrievalERC-7930Interoperable Addresses

What the specification covers

AbstractMotivationUse CasesSpecificationOverviewHook Function SignatureParametersFunction Call FormatHook EncodingBytes FormatString FormatDetecting HooksResolving Hooks (Read Operations)Write OperationsExample: Cross-Chain KYC Credential ResolutionRationaleWhy Include Both Function Selector and Function String?Why Use ERC-7930 Interoperable Addresses?Why Include the Return Type?Why Mandate [ERC-3668](./eip-3668.md)?Backwards CompatibilitySecurity ConsiderationsTarget TrustRecursive HooksCopyright

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