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Avalanche’s original Subnet architecture let a group of validators validate additional blockchains alongside the Primary Network. For new sovereign networks, Avalanche now describes the model as an Avalanche L1: it has its own validator set and can define its own membership, economics, execution rules, and fees. Developers should generally start on C-Chain when it meets the application’s needs, and choose an L1 when a specific requirement—such as validator control, custom rules, or isolation—justifies the extra design and operating responsibility.
What “Avalanche Subnet architecture” means now
The term Subnet can refer to Avalanche’s legacy validator arrangement. Avalanche’s current model for new sovereign networks is an Avalanche L1. Existing Subnets remain supported, and the older name still appears in Avalanche code and transaction terminology. The distinction matters: legacy Subnets and current L1s have different validator models.
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The Primary Network is itself a special Avalanche L1. It runs three chains: the P-Chain, which coordinates network and validator records; the C-Chain, used for smart contracts; and the X-Chain. Primary Network validators secure these chains. An application can deploy on C-Chain or operate one or more blockchains under a separate L1.
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Legacy Subnets and current Avalanche L1s
ACP-77 introduced the current L1 flow. The practical difference is who controls validator admission and what operators must validate.
| Architecture | Who validates it | Primary Network requirement | Validator-set control |
|---|---|---|---|
| Legacy Subnet | A subset of Primary Network validators validates the Subnet’s additional blockchains. | Subnet validators also validate the Primary Network and meet its staking requirement. | A validator could join multiple Subnets; adding validators used the older Subnet owner-key process. |
| Avalanche L1 | A separately defined L1 validator set validates the L1’s blockchain or blockchains. | L1 validators sync P-Chain state, but do not thereby validate the Primary Network. | The L1 defines its validator-set management and admission rules; its validator manager is specified through P-Chain transactions, with updates communicated using Warp messages. |
An existing Subnet can be converted to an L1. After conversion, its old owner-key process for adding validators is disabled, and the L1 flow must be used. ACP-77 explains the change and the P-Chain’s role in recording and authenticating validator updates: [ACP-77: Reinventing Subnets]. Avalanche’s overview of the validator distinction is dated December 4, 2024: [Subnet & L1 Validators, What’s the Difference?].
When should a developer use C-Chain or an L1?
Avalanche’s practical starting point is C-Chain for an application with a modest transaction rate and no special requirement that rules it out. It offers existing infrastructure and avoids taking on a separate network’s validator and security design. Revisit an L1 if the application gains traction or C-Chain becomes a concrete constraint. An L1 is a choice for control and isolation, not a general promise of better performance.
Reasons to consider an L1
- Custom rules: You need application-specific execution logic, fees, or token economics.
- Validator control: Membership must be restricted or selected by technical, geographic, licensing, or KYC/AML criteria, or participation must be private or permissioned.
- Isolation: You need to isolate the application’s performance from other Avalanche L1s.
- Specialized operations: Validators must meet application-specific hardware or performance requirements.
- Cross-L1 design: Your application depends on native messaging between Avalanche L1s, and its VM and tooling support the approach.
Questions to settle before choosing
- Which C-Chain capability or constraint makes a separate network necessary?
- Who may operate validators, how is validator weight assigned, and what happens when a validator misbehaves or leaves?
- Who maintains the validator manager and the L1’s security rules?
- What privacy, compliance, or interoperability requirements apply, and can the selected VM and tools meet them?
- What costs and operational work follow from the chosen validator model?
There is no source-backed, comparable throughput or latency figure here that establishes when an L1 will outperform C-Chain. Isolation and customization are architectural options; actual performance depends on the application and network design.
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What operating an L1 makes your team responsible for
An L1’s control over its validator set also puts security-critical decisions in the L1’s hands. Its rules must define who can join, how validator weight works, and how the system handles departure or misbehavior. ACP-77 says the P-Chain records and authenticates validator updates, but does not govern L1 staking rewards or assets held under the L1’s own rules.
ACP-99 proposes a Solidity validator-manager contract standard for managing validator sets and relaying updates to the P-Chain. That can help structure validator management, but it does not remove the need to decide and secure the L1’s own rules: [ACP-99: Validatorsetmanager Contract].
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Development teams can use Avalanche’s managed testnet nodes for experimentation; the setup guide says those nodes automatically shut down after three days. Self-hosted nodes are the alternative for production or longer testing. The guide does not prescribe one hardware configuration for every L1, so node sizing should follow the project’s workload and requirements: [Set up Validator Nodes].
Validator costs: distinguish Primary Network staking from the L1 fee
As listed on Avalanche’s node requirements page, accessed in 2026, a Primary Network validator stakes 2,000 AVAX to validate the P-, C-, and X-Chains. The same page lists an L1 validation-slot fee of 1.33 AVAX per month, burned to the P-Chain. These figures describe different obligations: the 2,000 AVAX stake is not an L1 validator stake, and each L1 defines its additional validation and staking rules. Because fees can change, verify the current figure before budgeting: [Introduction: Node Requirements].
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Cross-L1 messaging and VM compatibility
Avalanche Warp Messaging supports native communication between Avalanche L1s, and Teleporter is documented as a messaging tool built on Warp. The surfaced Devnet tutorial demonstrates messaging between two L1s and the C-Chain, but its stated scope is Subnet-EVM and Subnet-EVM-based virtual machines. If your L1 uses a different VM, confirm compatibility before making Teleporter a required part of the design: [Teleporter on Devnet].
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