Fireblocks & Institutional Custody Integration
Institutional custody integration connects a custodian such as Fireblocks to your product so you can hold and move assets under policy without building custody in-house. We wire the custodian's API into your transaction and treasury flows, encode your policy and approvals, reconcile to your ledger, and operate it, as an engineering partner that does not hold your funds.
Institutional custody integration is the engineering that connects a custodian such as Fireblocks to your product, so your team can hold and move digital assets under policy without building custody in-house or handling raw private keys. A custodian like Fireblocks provides the secure key management (usually MPC, where a key is split so no single party ever holds it whole), the transaction signing, and the policy engine; the integration is everything that makes it work inside your application: wiring the custodian's API into your deposit, withdrawal, and treasury flows, encoding your approval and policy rules, reconciling on-chain movements to your ledger, and operating the whole thing safely. That surrounding work is where a custody project succeeds or stalls, and it is the part we build.
Protofire builds that layer as an engineering and operations partner, not as a custodian. We are an official Safe partner with 130+ Safes deployed and years inside the Safe codebase, Protofire-deployed networks secure $2B+ across 120+ EVM networks, and we run managed on-chain operations (24/7 key and upgrade operations, monitoring, and incident response) for live products.
So when you integrate Fireblocks or an MPC custodian, we bring the treasury, policy, and operations experience the custodian's API does not give you, and we do it without ever holding your funds.
Custody integration is the layer around the custodian
The custodian secures the keys; we build and operate everything that connects it to your product.
Custody connection
Policy & approvals
Transaction flows
Treasury & reconciliation
Monitoring & operations
What is institutional custody integration?
There are three broad ways to hold digital assets, and they suit different needs. Self-custody means you hold the keys, typically through a smart-account multisig like Safe, which gives you full control and is what we deploy under Safe multisig deployment.
Institutional MPC custody, the model Fireblocks, Copper, BitGo, and similar providers offer, splits each key across parties so none holds it whole, and adds a policy engine, insurance, and support that regulated institutions often require. Exchange or qualified-custodian custody hands the keys to a licensed third party entirely.
Custody integration usually means connecting an MPC custodian to your product while keeping your team in control of policy, and we help choose and integrate the model that fits your risk, regulatory, and operational needs.
Connecting a custodian is more than calling its API. The integration has to route your product's real flows, customer deposits, withdrawals, treasury rebalancing, settlement, through the custodian under the right controls, encode who can approve what (the authority matrix and approval workflows), reconcile every on-chain movement back to your ledger so the books close, and handle the failure cases (a stuck transaction, a policy rejection, a chain reorg) without losing track of funds.
We build these flows into your existing product, so the custodian becomes part of how your application works rather than a console someone operates on the side.
The point of institutional custody is control, so the policy layer is the core of the integration. We encode your transaction policy, spend limits per role, whitelisted destinations, approval thresholds, time locks, and the authority matrix that says which people or systems can initiate and approve which actions.
Getting this right is what lets an organization move real value quickly without concentrating the power to move it in one person or one key. We design these controls with the same discipline we bring to Safe governance, because a policy gap in a custody flow can let funds leave that should not.
What we deliver
Integration of Fireblocks or an MPC custodian into your product: the API and SDK wiring, the deposit, withdrawal, and treasury transaction flows, and the webhooks and reconciliation that keep your ledger in sync with on-chain reality.
The policy engine configuration and authority matrix, treasury and float management, and reconciliation of every movement to your core ledger, so assets move under control and the books always close. Treasury keys and approvals follow a matrix you own, not a single signer.
Optional 24/7 managed operations: monitoring of custody flows, incident response, and key and upgrade operations, so live money is never unattended. Where reserves must be proven on-chain, we add Proof of Reserve.
Who is Fireblocks and custody integration for?
Fintechs, exchanges, and payment providers integrating digital-asset custody into a product need the custodian wired into real customer flows under policy, not just a test transaction, and want it built by a team that has run production asset movement. Asset managers and treasuries moving to institutional custody need the policy, approval, and reconciliation layer that turns a custodian into controlled operations, with the authority matrix they require. Protocols and DAOs operating a large treasury want institutional-grade controls and monitoring around how funds move. Institutions evaluating custody models come to us for the integration and, often, help choosing between self-custody (Safe), MPC custody (Fireblocks and peers), and a qualified custodian. The common requirement is that custody has to work inside a real product under real controls, and you would rather have the integration and operations built by a team that does this than discover the gaps with live funds. We build and operate it, and we never hold your assets.
An engineering and operations partner for custody, not a custodian
Protofire is a blockchain development company with 250+ shipped projects across 60+ networks and 95+ protocols since 2016. The credentials that matter for custody are specific. We are an official Safe partner with 130+ Safes deployed and years inside the Safe codebase, and Protofire-deployed networks secure $2B+ across 120+ EVM networks, so the account, policy, and authority-matrix layer custody runs through is one we know deeply.
We run managed on-chain operations, the 24/7 key, upgrade, monitoring, and incident-response function that live custody needs, and we build Proof of Reserve where backing must be attested on-chain. We maintain Solhint, the Solidity linter used by 1M+ developers.
We are the engineering and operations partner: the client, or its custodian, holds the assets, and we build and run the integration that moves them under the client's control.
“A custodian secures the keys. Everything that connects it to your product, policy, approvals, treasury flows, and reconciliation, is what we build.”
FAQ
What is Fireblocks integration?
What is the difference between Fireblocks and Safe?
Does Protofire hold or have access to our funds?
What is MPC custody?
Can you integrate a custodian we already use?
Reviewed by Luis Medeiros, Field CTO at Protofire. Last reviewed: July 2026.