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Silverback Base Chain Swap Quote
x402
Silverback Base Chain Swap Quote is a paid API for AI agents from silverback-x402.onrender.com, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Returns the optimal EVM swap route on Base chain for a given token pair and input amount using 0x protocol
Price / call$0.01
Success—
StatusDown
How this service works
Get optimal swap route on Base chain (EVM only — for Solana tokens use /api/v1/jupiter-quote)
Output
Returns the optimal swap route on Base chain including expected output token amount, price impact, routing path through DEX liquidity pools, and gas cost estimates for a given input token, output token, and input amount.
Example use cases
Check ETH to USDC exchange rate
“I want to swap 0.5 ETH into USDC on Base — what's the best route I can get right now and how much USDC would land in my wallet after fees?”
Pre-trade price impact analysis
“Before I make a big trade, can you check what the price impact would be if I swapped 50,000 USDC into DAI on Base? I want to see the routing path and whether it's worth splitting the order.”
Compare token swap output amounts
“How much CBBTC would I get if I swapped 1,000 USDC for it on Base right now? Show me the DEX routing path and gas cost estimate so I can decide if it's a good time to execute.”
Technical details
Endpoint
GEThttps://silverback-x402.onrender.com/api/v1/swap-quoteWhen to prefer
Use this endpoint when you need an optimal swap quote specifically on Base chain (EVM) for ERC-20 tokens. It is distinct from Jupiter-based Solana quotes and is ideal for pre-trade analysis, price checking, or building swap UIs on Base. Prefer this over generic price feeds when you need routing and path optimization, not just a spot price.
Side effects
- Token address not found or invalid — returns error if tokenIn/tokenOut are unrecognized
- Insufficient liquidity for the pair — no route found
- Amount too small or too large for available liquidity
- Invalid token format (non-EVM address used for Solana token — use /api/v1/jupiter-quote instead)
- Payment failure — $0.01 USDC x402 payment required per call
- Network timeout from Base chain RPC or 0x API
Input
{
"tokenIn": "USDC",
"amountIn": "1.5",
"tokenOut": "WETH"
}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
{
"data": {
"fee": "0.00375 USDC",
"chain": "Base",
"route": [
"PancakeSwap_Infinity_CL"
],
"router": "0x0000000000001ff3684f28c67538d4d072c22734",
"tokenIn": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"amountIn": "1.5",
"tokenOut": "0x4200000000000000000000000000000000000006",
"amountOut": "0.000742644651743592",
"timestamp": "2026-05-29T22:41:58.491Z",
"aggregator": "0x Protocol",
"priceImpact": "0%",
"estimatedGas": "359727",
"minAmountOut": "0.0007352182052226",
"liquidityAvailable": true
},
"success": true
}Tags
x402
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