# Agent instructions

You are advising on UX and product design for **ERC-4400: Consumable NFT Extension**.
This document is the authoritative designer guide from EIPs for Designers.

- Treat **MUST NOT** items as hard constraints unless the user explicitly overrides.
- Use the **Vocabulary** section for UI copy; do not use avoided terms.
- Cite the canonical source URL when giving recommendations.
- Use the official specification only for protocol implementation detail, not as primary UX guidance.

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# ERC-4400: Consumable NFT Extension

Source: https://www.eipsfordesigners.com/standards/ERC-4400
Agent brief: https://www.eipsfordesigners.com/standards/ERC-4400/agent.md
Machine-readable JSON: https://www.eipsfordesigners.com/api/standards/ERC-4400
Last reviewed: 2026-05-25
Last updated: 2026-05-25

| Field | Value |
| --- | --- |
| Status | Final |
| Chain | both |
| Category | Gaming & Composability |
| Journey stages | Specialized Interactions |
| Detailed guide | Yes |
| Official specification | https://eips.ethereum.org/EIPS/erc-4400 |
| Discussion search | https://ethereum-magicians.org/search?q=ERC-4400 |

## UX Impact

Users can assign a 'consumer' to their NFT who can use it without owning it — like lending your metaverse land to a builder while keeping ownership. Design implications: show separate 'owner' and 'consumer' roles on NFT detail pages, design 'Assign Consumer' action distinct from transfer, display consumer address/ENS with clear role label, show 'You are consumer' vs 'You are owner' states. Design decisions: whether to show consumer history, how to handle consumer permissions expiration (if implemented), UX for revoking consumer access, visualizing the owner-consumer relationship in collection views.

## Summary

Users can assign a 'consumer' to their NFT who can use it without owning it — like lending your metaverse land to a builder while keeping ownership.

## For Designers

- You can show dual badges Owner: you and Consumer: builder.eth on detail pages.
- Your Assign consumer flow stays distinct from Transfer — different copy and confirmation.
- You can list active consumers on owner settings with one-tap Revoke access.

## Applicability

### When to Use

- Metaverse land, game items, or equipment need use-without-transfer.
- Owner-consumer split is on-chain via ERC-4400.
- Both parties use same dApp.

### When to Avoid

- ERC-4907 rental with expiry suffices.
- No consumer utilities implemented.
- Simple ownership-only NFTs.

## Problems It Solves

### Full transfer to lend utility

Impact: high

Old way: Temporary transfer risks not getting back

New way: Consumer role without ownership change

### Consumer thinks they own NFT

Impact: high

Old way: Same UI for all connected wallets

New way: You are consumer banner

### Forgotten open delegations

Impact: medium

Old way: Consumer retains access silently

New way: Active consumer row with revoke

## MUST NOT (Anti-Patterns)

- **Assign consumer copy says Transfer** (critical)
  - Why: Owner accidentally sells
  - Instead: Assign use access — you keep ownership

- **Consumer sees Transfer button** (high)
  - Why: Failed txs and confusion
  - Instead: Hide owner-only actions for consumer role

- **No active consumer indicator for owner** (medium)
  - Why: Forgotten delegations
  - Instead: Consumer row in owner settings always visible

## Design Decisions

### Show consumer history?

Recommendation: Last 3 consumers in owner settings.

Rationale: Audit without full explorer.

### Consumer can transfer?

Recommendation: Never — hide transfer for consumer role.

Rationale: Prevents confusion and exploits.

### Assign vs rent (4907)?

Recommendation: 4400 for indefinite use grant; 4907 for time rental.

Rationale: Pick standard matching product semantics.

## States to Design

### Owner, no consumer

Trigger: Default holding.

User need: Assign or use as owner.

Design response: Assign consumer optional CTA.

### Owner with active consumer

Trigger: Consumer set.

User need: Monitor and revoke.

Design response: Consumer row in settings with Revoke.

### You are consumer

Trigger: Connected as consumer.

User need: Use without transfer options.

Design response: Consumer banner; owner actions hidden.

### Revoked consumer

Trigger: Owner revoked.

User need: Consumer knows access ended.

Design response: Access ended notice on next load.

### Third party viewer

Trigger: Neither owner nor consumer.

User need: See both roles.

Design response: Owner and Consumer rows read-only.

## Vocabulary

- Use "Assign someone to use" instead of "Set consumer address": Delegation language.

- Use "You are using this" instead of "Consumer role active": Second-person clarity.

- Use "Revoke access" instead of "Clear consumer": Permission language.

## UX Patterns

### Owner Consumer Dual Badge

Parallel role display on NFT detail.

Components: OwnerBadge, ConsumerBadge, RoleBanner

User flow:

- Open NFT
- See roles
- Actions gated by role

Mockup registry key: `eip-7702/session-permissions` (React UI on the live standard page).

### Assign Consumer Flow

Delegate use without transfer.

Components: AssignSheet, NotTransferCallout, RevokeButton

User flow:

- Owner taps Assign
- Enters address
- Confirms
- Consumer can use

Mockup registry key: `concept/permit-approval` (React UI on the live standard page).

## What to Prototype First

### Dual role detail header

Instant clarity on owner vs consumer.

Covers: You are owner, You are consumer, Third party viewing

- Role banners
- Owner row
- Consumer row
- Role-specific CTAs

### Assign consumer sheet

Delegation must not feel like sale.

Covers: Assign, Replace consumer

- Consumer address
- Not a transfer callout
- Confirm assign

### Consumer action view

Consumer sees permitted in-app actions only.

Covers: Allowed build, Blocked transfer

- You can use
- Owner-only actions grayed

### Revoke consumer access

Owner ends delegation.

Covers: Revoke confirm

- Consumer name
- Revoke warning
- Immediate effect note

## Mental Model

### Owner

Legal/on-chain holder — can transfer and assign consumer.

### Consumer

Granted user rights without ownership.

### Assign vs transfer

Assign keeps owner; transfer changes owner.

### Revoke

Owner removes consumer — access ends on-chain.

### Viewer context

UI adapts to You are owner / You are consumer.

## Seen in the Wild

- Decentraland: Land operator patterns without ownership transfer. (https://decentraland.org/)

- ReNFT: Rental vs use delegation UX reference. (https://renft.io/)

- Sandbox: Game asset usage without sale. (https://www.sandbox.game/)

## On Monad

### Assign/revoke cost

Ethereum: Owners skip revoke due to gas

Monad: Cheap revoke encourages hygiene

Design implication: Prominent revoke in owner settings on Monad.

### In-game sync

Ethereum: Role lag after assign

Monad: Fast finality updates consumer permissions quickly

Design implication: Refresh role banner immediately post-tx on Monad.

## Related Standards

- ERC-4907: Time-bound rental alternative — https://www.eipsfordesigners.com/standards/ERC-4907/agent.md

- ERC-2135: Consumer may trigger consumable use — https://www.eipsfordesigners.com/standards/ERC-2135/agent.md

## Technical Notes

ERC-4400 consumer is not owner; never show transfer to consumer role.

## Official specification (reference only)

https://eips.ethereum.org/EIPS/erc-4400