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Spire’s Vision for Ethereum Appchains

Spire enables the next generation of Ethereum applications through based appchains—blockchains that combine the sovereignty and scalability of dedicated chains with the composability and security of their settlement layer. The mission is to create the best application platform for the Ethereum ecosystem by making appchains that don’t become islands. Based appchains unlock a new paradigm where applications can be:
  • Sovereign - Full control over infrastructure, fees, and token models
  • Scalable - Dedicated execution environment without “noisy neighbor” effects
  • Composable - Seamless interoperability with settlement layer protocols
This approach enables developers to build applications that are both powerful and connected, creating a unified ecosystem where appchains can treat their parent chain as their native data and liquidity hub.

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The Pylon Advantage

Pylon is Spire’s platform for launching based appchains that settle to and compose with leading Ethereum L2s. Unlike traditional cross-chain solutions that introduce oracle risks and execution gaps, Pylon enables synchronous composability—the ability to read from and interact with settlement layer contracts as if they were deployed on the same chain.

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Key Benefits

  • Atomic operations - Cross-chain calls succeed or fail together
  • No oracles needed - Direct settlement layer state access
  • Simplified development - Write cross-chain code like single-chain code
  • Better UX - No waiting for confirmations or async handling

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What’s Next?

  • Why Appchains? - The case for appchains over traditional L2s
  • Get Started - Deploy your first appchain in 10 minutes
  • Core Concepts - Understand based appchains and synchronous composability