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Silverback 0x Permit2 Token Swap
x402
Silverback 0x Permit2 Token Swap is a paid API for AI agents from silverback-x402.onrender.com, paid per call via x402, $0.05/call, status down (last checked 2026-09-15).
Returns EIP-712 Permit2 signing data and step-by-step instructions to swap one token for another on Base chain via the 0x protocol
Price / call$0.05
Success—
StatusDown
How this service works
Handles paid token swaps across EVM and Solana networks, accepting exact-amount payments (e.g., USDC) with configurable timeouts.
Output
Returns step-by-step instructions including EIP-712 data to sign via Permit2, how to append the signature to the transaction, and how to broadcast it — plus code examples for executing the swap on Base chain via 0x.
Example use cases
Example prompt
“Swap 0.1 WETH for USDC on Base using my wallet 0xAbC...123, with a max slippage of 1%, and give me the Permit2 EIP-712 data I need to sign and broadcast.”
Technical details
Endpoint
GEThttps://silverback-x402.onrender.com/api/v1/swapWhen to prefer
Choose this endpoint when you need to swap ERC-20 tokens on Base chain using the 0x Permit2 flow (EIP-712 sign-and-broadcast pattern). Prefer it over Jupiter-based endpoints (which are for Solana). Use it when the agent needs to construct a signable swap transaction with slippage control rather than just getting a price quote.
Side effects
- Invalid token symbol or address returns error identifying unrecognized token
- Unsupported token pair with no liquidity returns routing failure
- Invalid wallet address format causes validation error
- Amount too small or too large may fall outside supported swap range
- Slippage value out of acceptable range returns parameter error
- Network congestion or 0x API downtime causes timeout or 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenIn | string | Token to sell (symbol like USDC, WETH, VIRTUAL or 0x address) |
| amountIn | string | Amount to swap in human-readable units (e.g. '0.1' for 0.1 WETH) |
| slippage | string | Max slippage % (default: '1') |
| tokenOut | string | Token to buy (symbol or 0x address) |
| walletAddress | string | Your wallet address — you will sign the Permit2 data and submit the transaction |
Tags
x402
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