Persistent memory
Bersama Taklukan DigitalGive every NPC a memory, a history, and an identity they truly own—persistent across sessions, stories, and worlds.
Every character becomes a life shaped by what they remember
01
Memory
02
History
03
Relationships
04
Achievements
05
Inventory
06
Onchain identity
Built for living worlds
More than dialogue.
A continuous life.
The foundational systems that let characters remember, change, own, and continue.
01
Memory that persists
Important conversations, decisions, and life events survive every session.
02
Personality that evolves
NPC behavior adapts naturally through experience instead of resetting.
03
Identity on Solana
Every character has a verifiable, portable identity anchored onchain.
04
Relationships with continuity
Trust, rivalry, and shared history develop into meaningful long-term bonds.
05
Ownership beyond one world
Achievements and inventory can move with the character across games and stories.
From first meeting to forever
One identity.
Every chapter.
4BTD gives developers the primitives to create characters whose lives continue beyond a single conversation, session, or game.
STEP 01
Connect the 4BTD SDK
Add persistent character infrastructure to your game with a lightweight integration.
import { createWorld } from '@4btd/sdk'const world = createWorld({network: 'solana'})
STEP 02
Create an NPC identity
Define the character once—personality, origin, values, and ownership rules included.
const mira = world.character({name: 'Mira',traits: ['curious', 'loyal'],memory: 'persistent'})
STEP 03
Let every moment persist
Important dialogue, relationships, achievements, and items become structured memories.
await mira.remember({event: 'player_saved_village',emotion: 'grateful',trust: +18})
STEP 04
Continue in any world
Load the same identity later, in another session—or inside an entirely different game.
const mira = await world.resume('7xQ4...m2A')// 27 memories restored ✓
Try a living conversation
A moment becomes
a memory.
Choose an action. Mira reacts, her relationship changes, and the important moment becomes structured memory.
M
Mira of Aster
Ranger · Persistent identity
MiraThe gate remembers every traveler. I wish I could say the same.
Choose your response
Solana mainnet
What Mira remembers
RELATIONSHIP · PLAYER52% TRUST
◇
Meaningful memories will appear here.
IDENTITY · 7xQ4...m2A0 EVENTS ANCHORED
CLUSTER · MAINNET-BETARPC CONNECTED
Start small. Build beyond.
A plan for every world.
Prototype your first persistent NPC for free, then scale the infrastructure as your world grows.
Prototype
For experimenting with persistent characters and early game concepts.
$0
Free to build
- 3 persistent NPCs
- 1,000 memory events / month
- Solana devnet identity
- Community support
Most popular
World Builder
For studios shipping living characters into active game worlds.
$49
per month
- 50 persistent NPCs
- 100,000 memory events / month
- Solana mainnet identity
- Relationship and inventory state
- Priority developer support
Enterprise
For ambitious worlds requiring scale, control, and hands-on collaboration.
Custom
Designed with your team
- Unlimited character architecture
- Custom memory infrastructure
- Advanced analytics and controls
- Dedicated integration support
- Full Four Studio access
Usage limits can be expanded at any time. No character data is lost when plans change.
Questions, remembered
Everything
you need to know.
Still exploring an integration? Talk with Four Studio about your characters, world, and technical requirements.
Ask a question4BTD—4 Beyond The Dialogue—is infrastructure for persistent AI characters. It gives NPCs long-term memory and a portable onchain identity, so their personality, relationships, achievements, inventory, and important experiences can continue across sessions and worlds.