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ERC-8349 Index-Based Multi-Facet Proxy

DraftERCcreated 2026-07-25requires ERC-165

A modular proxy architecture that uses compact facet indices for protocol routing while preserving function selectors for compatibility.

Author: Artem Buchikhin (@Arhemius)

ERC-165 interface ids

Computed here as the XOR of the selectors each interface defines.

IObservability0x1c60a259

Functions this standard introduces (5)

0xd5e532eegetFacetAt(uint8)view
0x5cc47d56getFacetCount()view
0xb1f45b38getFacetEntries()view
0x662ea47dgetFacets()view
0x429b12a4getFirstFreeSlot()view

Depends on (1)

Proposals this one names in its requires field.

ERC-165Standard Interface Detection

What the specification covers

AbstractMotivationArchitectural InnovationSpecificationTerminologyFoundational ConceptsRouting Model ClassificationRouting SemanticsArchitectural OrganizationCento TerminologyRouting ArchitectureProtocol RoutingCompatibility RoutingCalldata EncodingDelegatecall SemanticsFallback Function Example ImplementationFacet IdentificationFacet ManagementOwnershipAtomic UpdatesStorage MigrationFacet Management InterfaceProtocol IntrospectionERC-165 IntegrationInitial StateRationaleWhy Explicit Facet Identity?Routing Index WidthStorage IndependenceSeparation of Routing and CompatibilityRelationship to ERC-2535Facets as First-Class Protocol ComponentsScopeBackwards CompatibilityReference ImplementationSecurity ConsiderationsAuthorizationDelegatecall RisksFacet ValidationRouting ValidationEmpty CalldataSelector CollisionsStorage MigrationsFacet UpgradesImmutable RouterCopyright

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