Stackup

• Name: Stackup
• URL: https://www.stackup.fi/
• Category: treasury control plane / crypto finance-operations platform / self-custodial smart-account infrastructure
• Tags: ethereum-ecosystem
• Summary: Stackup is treasury software built on smart-account rails. The useful point is not AA infrastructure in the abstract; it is that Stackup turns shared accounts, passkeys, approvals, invoice flow, and bank hookups into one operator surface for crypto-native finance teams. Good note for treasury-control comparisons, not for treating every ERC-4337 vendor as a finance platform.
• What it does:
  • Provides a web platform and APIs for businesses to pay vendors, receive crypto payments, manage team permissions, and operate shared wallets with full audit trails
  • Uses self-custodial ERC-4337-style smart accounts with passkeys, role-based access, and configurable wallet-level permissions rather than relying on shared EOAs or hardware-wallet-heavy workflows
  • Connects onchain treasury activity with offchain banking rails, including US bank connectivity and fiat conversion through partner flows
  • Publishes a keystore architecture designed to keep account configuration gas-efficient, privacy-preserving, and easier to synchronize across multiple EVM chains
  • Maintains open-source keystore contracts, specification docs, deployment addresses, and audit artifacts that expose the underlying account model more clearly than the marketing site alone
• Key claims:
  • The homepage positions Stackup as crypto finance infrastructure for businesses that want to get paid onchain, automate bill payments, and unify onchain and offchain treasury operations
  • The security docs say the platform is built around self-custodial control, passkey authentication, audited smart-account contracts, and SOC2-oriented platform controls
  • The smart-account docs describe Stackup’s keystore accounts as purpose-built for shared multi-chain treasuries, emphasizing gas efficiency, privacy by default, and flexible access-control updates across chains
  • The keystore technical article argues that decoupling account configuration into a Merkle-tree-backed singleton contract helps solve key-rotation, cross-chain sync, gas-cost, and privacy problems that affect current smart-account designs
  • The docs and product guides show Stackup has expanded beyond its earlier ERC-4337 infrastructure identity into a broader finance-ops platform with invoicing, team workflows, bank connectivity, and transaction operations for crypto businesses
• Whitepaper: No classic standalone Stackup company whitepaper or litepaper was found in this pass. The strongest technical primary sources were the official docs, the keystore technical article, the open-source keystore specification, and the public audit artifact saved locally; see ../whitepapers/stackup-primary-sources-2026-04-27.md and ../whitepapers/stackup-keystore-spearbit-july2025.pdf.
• Sources:
  • https://www.stackup.fi/
  • https://docs.stackup.fi/docs/security-overview
  • https://docs.stackup.fi/docs/understanding-smart-accounts
  • https://docs.stackup.fi/docs/stackup-essentials-guide
  • https://www.stackup.fi/resources/stackup-keystore
  • https://github.com/stackup-wallet/keystore
  • https://raw.githubusercontent.com/stackup-wallet/keystore/main/README.md
  • https://raw.githubusercontent.com/stackup-wallet/keystore/main/doc/spec.md

Internal linkages

• Keep this note tight.

• Best anchors: safe, fireblocks, and aera.

• Reusable lens: Stackup is where self-custodial treasury tooling cashes out as role design, signer recovery, payment approvals, audit visibility, and cross-rail operating defaults.

• Useful contrast: bundler vendors stay closer to ERC-4337 traffic plumbing, while Stackup is the finance-ops layer built on top.

• Last reviewed: 2026-05-31 UTC