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0x Swap Allowance Holder Firm Quote
x402
0x Swap Allowance Holder Firm Quote is a paid API for AI agents from agent.api.0x.org, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).
Returns a firm, executable quote for a token swap using the Allowance Holder contract to manage token approvals
Price / call$0.01
Success—
StatusUnknown
How this service works
Get the firm quote for a swap using Allowance Holder to set allowances
Output
Returns a firm, time-limited executable quote including the exact output token amount, swap price, gas estimate, transaction calldata, and any required Allowance Holder approval data needed to submit the swap on-chain.
Example use cases
Executing a large token swap on-chain
“I want to swap 5000 USDC for WETH on Ethereum — can you get me a firm 0x quote using the Allowance Holder so I know the exact amount I'll receive and the calldata to submit the transaction?”
Comparing firm vs indicative swap prices
“Get me a firm executable quote from 0x for swapping 2 ETH to DAI on Ethereum mainnet using Allowance Holder — I want to see if the firm price matches the indicative quote I got earlier.”
Automating DeFi rebalancing with guaranteed prices
“My portfolio rebalancer needs to sell 10000 USDC worth of WBTC into ETH on Ethereum — fetch a firm 0x Allowance Holder quote so the bot can verify slippage is within 0.5% before executing.”
Technical details
Endpoint
GEThttps://agent.api.0x.org/v1/x402/swap-allowance-holder-quote/1?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a binding, executable swap quote rather than an indicative estimate — specifically when you intend to actually submit the transaction on-chain. Prefer this over the indicative price endpoint when you need calldata and Allowance Holder approval details. Choose this over direct DEX calls when you want 0x's DEX aggregation to optimize the route across multiple liquidity sources on Ethereum mainnet (chain ID 1).
Side effects
- Insufficient liquidity for the requested token pair or amount returns an error or degraded quote
- Expired quote if too much time passes between fetching and submitting the transaction
- Invalid token addresses or unsupported pairs return 400 bad request
- Taker address not provided may result in incomplete calldata
- Network congestion may cause price to be unavailable momentarily
- Slippage tolerance too tight may result in no valid route found
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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