Pimlico

• Name: Pimlico
• URL: https://www.pimlico.io/
• Category: Account-abstraction infrastructure / ERC-4337 bundler and paymaster platform
• Tags: ethereum-ecosystem
• Summary: Pimlico is ERC-4337 plumbing: bundlers, paymasters, sponsorship, and routing. That makes it useful, because a lot of smart account UX rhetoric eventually cashes out as operator policy in exactly this layer. Strong infra vendor, not the account substrate.
• What it does:
  • Provides ERC-4337 infrastructure for smart accounts, including bundler and paymaster services
  • Offers API endpoints and managed infra for relaying user operations and sponsoring gas fees
  • Maintains open-source developer tooling including permissionless.js and the Alto bundler
  • Supports developers building account-abstraction-enabled wallets, apps, and embedded onchain UX across Ethereum and EVM-compatible chains
  • Positions itself as infrastructure for simplifying gas, nonce, and user-operation handling so product teams can focus on UX
• Key claims:
  • Homepage describes Pimlico as “the world’s most trusted and advanced smart account infrastructure platform”
  • Official docs describe it as “the world’s most advanced ERC-4337 account abstraction infrastructure platform”
  • Docs say Pimlico provides tools and services to build, deploy, and manage smart accounts on Ethereum and other EVM-compatible chains
  • Docs market paymasters that can sponsor gas fees on 100+ chains through a simple API endpoint
  • Public GitHub repositories show both a high-level smart-account library (permissionless.js) and an open-source ERC-4337 bundler (Alto)
• Whitepaper: No classic whitepaper or litepaper was found during this pass. Primary-source snapshots were saved in ../whitepapers/pimlico-primary-sources-2026-04-22.md.
• Sources:
  • https://www.pimlico.io/
  • https://docs.pimlico.io/
  • https://github.com/pimlicolabs
  • https://github.com/pimlicolabs/permissionless.js
  • https://github.com/pimlicolabs/alto

Internal linkages

• Best anchors: alchemy, safe, and biconomy.

Control surface

• Pimlico is not the account substrate. It is the traffic layer around ERC-4337: bundlers, paymasters, sponsorship policy, retries, and routing.

• That is why it matters. A lot of wallet UX solved talk turns back into operator policy before a UserOperation ever lands onchain.

• The leverage is simple: what gets admitted, what gets sponsored, what degrades cleanly, and which chains or standards get first-class support.

• Last reviewed: 2026-05-23 UTC