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SilverbackDeFi Swap Quote
x402
SilverbackDeFi Swap Quote is a paid API for AI agents from x402.silverbackdefi.app, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Returns the optimal token swap route and quote on the Base chain using 0x Permit2
Price / call$0.01
Success—
StatusDown
How this service works
Provides cross-chain token swap quotes (EVM & Solana), accepting paid requests in multiple token schemes and returning exact-amount pricing and timeout info.
Output
Returns the optimal swap route for the specified token pair and amount on Base chain, including expected output amount, price impact, and step-by-step EIP-712 signing instructions with code examples so the swap transaction can be broadcast on-chain.
Example use cases
Best rate for WETH to USDC
“I want to swap 2 WETH for USDC on Base — what's the best rate I can get right now, and which DEXs will the route go through?”
Cheapest ETH to DAI swap
“How much DAI would I get if I swapped 0.5 ETH on Base today? Find me the cheapest route and let me know if there's any significant price impact.”
USDC to WETH reverse quote
“I have 500 USDC and want to swap it to WETH on Base — what's the optimal route and how much WETH should I expect to receive?”
Technical details
Endpoint
GEThttps://x402.silverbackdefi.app/api/v1/swap-quoteWhen to prefer
Use this endpoint when you need an optimized swap quote specifically on the Base chain with 0x Permit2 integration, including actionable signing instructions. Prefer this over generic DEX interfaces when you need end-to-end swap execution guidance including EIP-712 data, or when operating on Base and needing the best aggregated route across Base DEXs.
Side effects
- Invalid or unsupported token address returns an error or empty route
- Unsupported token pair with no liquidity returns no route found
- Missing required parameters (tokenIn, tokenOut, amountIn) results in validation error
- Extremely low or zero amount may produce no viable route
- Network or liquidity provider downtime causes timeout or empty response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenIn | string | Input token address (0x format) or symbol (WETH, USDC) |
| amountIn | string | Amount to swap (human readable, e.g. '1.5') |
| tokenOut | string | Output token address (0x format) or symbol |
Output
Schema · Response
{
"type": "json",
"example": {
"fee": "0.3%",
"route": "WETH -> USDC",
"success": true,
"amountOut": "3500.50",
"priceImpact": "0.15%"
}
}Tags
x402
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