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On OpenGDP, users pay transaction fees directly in currency denominated stablecoins (USD, EUR, etc.). Unlike traditional general-purpose blockchains, there is no volatile native gas token that needs to be acquired.

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Fee Token Resolution

When a transaction is submitted, the protocol determines which stablecoin to charge using a deterministic resolution chain:
PrioritySourceExample
1Explicit feeToken field on the transactionAA tx sets feeToken: 0x20C0...USDC
2Inline setUserToken call to Fee ManagerUser updates preference in the same tx
3Stored user preference (on-chain)Previously set via Fee Manager
4Inferred from OGDP-20 call targettransfer() on a token contract
5Inferred from orderbook swap input tokenswapExactAmountIn(tokenIn: USDC, ...)
6Default: pathUSDFallback to the protocol’s base stablecoin

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Two-Phase Settlement

Fee collection uses a pre-charge / refund model to protect both users and validators:
  • Pre-charge: The maximum possible fee (gas_limit * gas_price, converted to token terms via 1e12 scaling) is deducted from the fee payer’s OGDP-20 balance.
  • Execution: The transaction runs normally.
  • Settlement: The actual gas consumed is calculated. The difference between the pre-charge and the actual cost is refunded to the fee payer.

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Constraints

  • Only OGDP-20 tokens with a set currency metadata (USD, EUR, etc.) are valid for fee payment.
  • The token must not be paused.
  • The fee payer must be transfer-authorized under the token’s policy.

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Use Case: Onboarding a New User

A new user receives USDC (as an OGDP-20 token) from a friend. They can immediately start transacting: sending payments, swapping tokens, or interacting with applications without ever needing to acquire a separate gas token. Their USDC balance covers everything.