We just completed a full security audit with Adevar Labs.
Fystack Logo

Launch Wallet Operations
in Days, Not Months

Hybrid custody architecture with MPC vaults for long-term storage and Hyper Wallets for speed and scale. One API, multi-chain, production-ready.

Start BuildingAPI Documentation
USE CASES

One Platform, Various Use Cases

Fystack provides a unified custody and wallet infrastructure that adapts to multiple use cases, from exchanges and OTC desks to stablecoin payment apps and enterprise platforms.

Exchanges & OTC Desks

Exchanges & OTC Desks

Secure high-volume deposits, withdrawals, and real-time balances across a unified hot, warm, and cold wallet architecture.

Payment & Stablecoin Apps

Payment & Stablecoin Apps

Streamline collections, payouts, and stablecoin operations via treasury automation with customizable policy approvals.

Crypto Payment Gateway

Crypto Payment Gateway

Accept crypto payments from customers, settle on-chain, and receive real-time webhook confirmations across multiple chains.

Unified Dashboard for Multichain Experience

Multi-workspace support for different teams, isolate operations by business unit while sharing infrastructure.

Total Value
Receive Send

$2,399,240

Total Wallets

46

Create Wallet
Search item
Filters
NameTypeTop AssetsValue
Treasury Hot
MPC
ETH
USDC
USDT
$1,240,580
Cold Storage
MPC
ETH
USDT
SOL
$890,200
Payout Wallet
MPC
USDC
USDT
SOL
$245,100
Payment #01
Hyper
ETH
USDC
$18,340
Payment #02
Hyper
SOL
USDC
$5,020
Fystack treasuryDefault
Other Workspaces (9)
Exchange ProductionOwner
Fystack TreasuryOwner
Payment AppOwner
Workspace StagingViewer
Crypto TestingViewer
Create New Workspace
Built for Engineering Teams

Seamless Developer
Experience

Ship faster with production-ready SDKs and APIs designed for modern engineering workflows.

SDKs

TypeScript · Go

APIs

REST + Webhooks

Supported Chains

Ethereum
BSC
Polygon
Avalanche
Base
Tron
Solana
Get StartedDocumentation
Developer Code Example

Key benefits

Powerful Wallet Infrastructure via APIs

Create and manage wallets programmatically. Fystack handles key generation, MPC signing, and policy enforcement through a single REST API.

Programmatic WalletsProgrammatic Wallets
MPC-secured SigningMPC-secured Signing
Policy-based ControlsPolicy-based Controls
Play Demo
POST /v1/wallets200 OK
{
"name": "Treasury",
"type": "MPC"
}
Fystack

Fystack Engine

Processing wallet creation...

Validate
Policy
Sign
Broadcast

Wallet

Created

Policy

Applied

MPC

Secured

Key benefits

Build Once. Operate at Scale.

One integration to support 100K+ wallets across multiple chains. No in-house custody R&D needed, Fystack handles the complexity.

Launch in weeks, not monthsLaunch in weeks, not months
No in-house custody R&DNo in-house custody R&D
Predictable, flat pricing at scalePredictable, flat pricing at scale
Reduced operational riskReduced operational risk
Play Demo

100K+

Wallets

7

Chains

99.9%

Uptime

Your Application

fystack.wallets.create()

Fystack Handles

Key generation & MPC ceremony
Multi-chain address derivation
Policy enforcement & approvals
Webhook notifications & indexing
One API, all chains

Key benefits

Automate Operations with Confidence

Set up approval workflows, automated sweeps, and real-time event streaming. Every transaction is policy-checked and fully auditable.

Approval WorkflowsApproval Workflows
Automated TransfersAutomated Transfers
Webhooks & EventsWebhooks & Events
Multi-channel NotificationsMulti-channel Notifications
Play Demo
Approval Workflow
Transfer initiatedAPI call
Policy check passedAuto
Manager approvedadmin@co.io
Transaction signedMPC
Live EventsStreaming
transaction.signednow
webhook.delivered1s ago
notification.sent2s ago
Fully automated
Transaction RequestPending
Transfer 50,000 USDC→ 0x8f2...a1c
Security Pipeline
Policy: Max 100K per txPASS
Whitelist: Address verifiedPASS
Velocity: Under daily limitPASS
Quorum: 2 of 3 approved1/3
MPC Threshold Signing
Shard 1 ✓
Shard 2 ✓
Shard 3 ...

Security & control

Security That Enables Automation

Every transaction passes through policy checks, whitelist verification, and quorum approvals before MPC signing. Automate with confidence.

MPC / Threshold SigningMPC / Threshold Signing
Policies enforced before signingPolicies enforced before signing
Quorum approvalsQuorum approvals
Multi-channel NotificationsMulti-channel Notifications
Background

Enterprise

For teams that need custom integrations, SLA guarantees, and dedicated support.

Join our community