Documentation Index
Fetch the complete documentation index at: https://anypay-docs-sdk-0-15-0-updates.mintlify.app/llms.txt
Use this file to discover all available pages before exploring further.
Overview
Trails supports paying gas fees in any permit-compatible (EIP-2612) token, including popular stablecoins like USDC and USDT. This removes the friction of needing native tokens on each chain.
Why This Matters
Common problems this solves:
- New chain onboarding: Users bridge to a new chain but have no native tokens for gas
- Stablecoin-first users: Users who hold primarily stablecoins don’t need to manage gas tokens
- Simplified UX: One token type for both payment and gas fees
How It Works
When a user initiates a transaction, the widget presents available fee tokens alongside the default native gas option. For permit-compatible tokens (EIP-2612), the user signs an off-chain permit rather than an on-chain approval — no separate gas-spending transaction is required. The Trails relayer uses that permit signature to cover the fee, deducting it from the user’s selected token balance.
Supported Fee Tokens
Any token implementing EIP-2612 (permit) can be used as a fee token.
See the API Integration Guide for the complete permit flow implementation at an API level.
In the Trails widget, alternative fee tokens are automatically presented to users when available. No additional configuration is required—the widget handles permit signatures and fee selection automatically.
