Gas Sponsorship

Sponsor gas fees for your users to remove blockchain onboarding friction

Note: Gas sponsorship is currently under development.

256 Blocks can sponsor gas fees for your users, eliminating the need for them to hold native tokens. This removes a major onboarding barrier for gaming, consumer apps, and enterprise use cases.

How It Works

  1. Your application sends a user operation to a 256 Blocks endpoint
  2. The policy engine evaluates whether to sponsor the transaction
  3. If allowed, 256 Blocks pays the gas fee on your behalf
  4. You are billed for the RPC call (credit usage) plus the gas cost (including a surcharge)

This works for both RPC endpoints and MCP integrations.

Controlling Sponsorship

Use denyGasSponsor rules in your policies to control when gas is sponsored:

# Don't sponsor transactions over $100
denyGasSponsor if {
    input.usd_value > 100
}
 
# Don't sponsor transactions from certain countries
denyGasSponsor if {
    input.source_country in {"KP", "IR", "CU"}
}

If no denyGasSponsor rule matches, the transaction is sponsored by default.

Billing

When a transaction is sponsored, you are charged:

  • Credit usage for the RPC call itself
  • Gas cost for the transaction (converted to credits)
  • Surcharge on the gas cost

See Billing for details on pricing.

Gas Sponsorship | 256 Blocks