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3Route Multichain Swap Quote & Unsigned Transaction Builder
x402
3Route Multichain Swap Quote & Unsigned Transaction Builder is a paid API for AI agents from 3route.agents.bakingbad.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns an optimal swap route and unsigned transaction payload for exchanging one token for another on a specified EVM-compatible chain.
Price / call$0.001
Success—
StatusUnknown
How this service works
Best-priced crypto token swaps for agents, traders and apps. Pay-per-call quote & swap API via x402/MPP. No API key or subscription.
Output
Returns a JSON object containing: an unsigned transaction object (to, from, data, value, gas, gasPrice) ready to sign and broadcast; the expected destination token amount (dstAmount); the minimum guaranteed destination amount accounting for slippage (dstAmountMin); and the source amount (srcAmount) and total gas estimate. The agent must sign and submit the transaction separately.
Example use cases
DeFi agent auto-rebalances portfolio
“Rebalance my portfolio by swapping 500 USDC (at 0x5fc5360d0400a0fd4f2af552add042d716f1d168) into the native asset on chain 4663 from my wallet 0xABCDabcdABCDabcdABCDabcdABCDabcdABCDabcd — use 0.5% slippage and give me the unsigned transaction to sign.”
Arbitrage bot fetches swap calldata
“Get me the swap transaction data to trade 2000000000000000000 units of token 0xAAbbCCdd1122334455667788990011aabbccdd11 into 0x5fc5360d0400a0fd4f2af552add042d716f1d168 on chain 4663, sender is 0x9999999999999999999999999999999999999999, with 2% max slippage.”
Onchain payment settled in preferred token
“A user just paid in the native token on chain 4663 but needs it converted to 0x5fc5360d0400a0fd4f2af552add042d716f1d168 — amount is 500000000000000000, from wallet 0x2222222222222222222222222222222222222222, deliver it to 0x3333333333333333333333333333333333333333, keep slippage under 1%.”
Technical details
Endpoint
GEThttps://3route.agents.bakingbad.dev/v1/pro/%7BchainId%7D/swapWhen to prefer
Use this endpoint when an AI agent needs to build a ready-to-sign swap transaction on chain 4663 (Etherlink or similar) via the 3Route DEX aggregator, especially when optimal routing across DEX liquidity pools is needed. Prefer it over on-chain calls when you need off-chain route computation before submitting. It is particularly suited for agent workflows that programmatically pay per call via x402 micropayments (USDC) without requiring API key management.
Side effects
- Invalid or unsupported chainId returns an error — only chain 4663 is supported on this endpoint
- Zero or negative amount string triggers validation error
- Source and destination token addresses must be valid 0x-prefixed 40-hex-char addresses or the zero address sentinel
- Insufficient liquidity for the requested pair results in a routing failure response
- Slippage value out of range (must be 0–100) returns a validation error
- Payment required (HTTP 402) if x402 payment header is missing or underfunded
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"tx": {
"to": "0x2222222222222222222222222222222222222222",
"gas": "210000",
"data": "0x1234",
"from": "0x1111111111111111111111111111111111111111",
"value": "1000000000000000000",
"gasPrice": "1000000000"
},
"gas": 210000,
"dstAmount": "950000",
"srcAmount": "1000000000000000000",
"dstAmountMin": "940500"
}
}Tags
x402
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