Cheat Sheet
📃 Chain Support
Swap and Gasless v2 APIs are currently supported on the following chains. Select the chain in your request by providing the corresponding chainId request parameter. To request support for a new chain, please submit a request here.
| Chain | Chain ID | Swap API | Gasless API |
|---|---|---|---|
| Ethereum (Mainnet) | 1 | ✅ | ✅ |
| Arbitrum | 42161 | ✅ | ✅ |
| Avalanche | 43114 | ✅ | |
| Base | 8453 | ✅ | ✅ |
| Blast | 81457 | ✅ | |
| BSC | 56 | ✅ | |
| Linea | 59144 | ✅ | |
| Optimism | 10 | ✅ | ✅ |
| Polygon | 137 | ✅ | ✅ |
| Scroll | 534352 | ✅ |
Swap API v2
Sample Request and Response
See full list of required query parameters and responses here.
Request
curl --request GET \
--url 'https://api.0x.org/swap/permit2/quote?chainId=1&sellAmount=100000000000000000000&taker=0xa423C7Be031E988B25fb7Ec39b7906582f6858c6&sellToken=0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2&buyToken=0x6b175474e89094c44da98b954eedeac495271d0f' \
--header '0x-api-key: <YOUR_API_KEY>'
Response
Expand to see response
{
"blockNumber": "20170903",
"buyAmount": "340843848647293527128015",
"buyToken": "0x6b175474e89094c44da98b954eedeac495271d0f",
"fees": {
"integratorFee": null,
"zeroExFee": {
"amount": "512033823706500040753",
"token": "0x6b175474e89094c44da98b954eedeac495271d0f",
"type": "volume"
},
"gasFee": null
},
"gas": "522732",
"gasPrice": "14551300000",
"issues": {
"allowance": {
"actual": "0",
"spender": "0x000000000022d473030f116ddee9f6b43ac78ba3"
},
"balance": {
"token": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
"actual": "0",
"expected": "100000000000000000000"
},
"simulationIncomplete": false,
"invalidSourcesPassed": []
},
"liquidityAvailable": true,
"minBuyAmount": "337435410160820591856735",
"route": {
"fills": [
{
"from": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
"to": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"source": "Uniswap_V3",
"proportionBps": "10000"
},
{
"from": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"to": "0x6b175474e89094c44da98b954eedeac495271d0f",
"source": "Maker_PSM",
"proportionBps": "10000"
}
],
"tokens": [
{
"address": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
"symbol": "WETH"
},
{
"address": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"symbol": "USDC"
},
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"symbol": "DAI"
}
]
},
"sellAmount": "100000000000000000000",
"sellToken": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
"totalNetworkFee": "7606430151600000"
}
Gasless API v2
Sample Request and Response
See full list of required query parameters and responses here.
Request
curl --request GET \
--url 'https://api.0x.org/gasless/quote?chainId=8453&sellToken=0x833589fcd6edb6e08f4c7c32d4f71b54bda02913&buyToken=0x4200000000000000000000000000000000000006&sellAmount=100000000&taker=0x4D2A422dB44144996E855ce15FB581a477dbB947' \
--header '0x-api-key: <YOUR_API_KEY>'
Response
Expand to see response
{
"approval": {
"type": "permit",
"hash": "0x334281749a8d1c7e518024109ee8f31c5e55109764efa33b2864a6ab26d90889",
"eip712": {
"types": {
"EIP712Domain": [
{
"name": "name",
"type": "string"
},
{
"name": "version",
"type": "string"
},
{
"name": "chainId",
"type": "uint256"
},
{
"name": "verifyingContract",
"type": "address"
}
],
"Permit": [
{
"name": "owner",
"type": "address"
},
{
"name": "spender",
"type": "address"
},
{
"name": "value",
"type": "uint256"
},
{
"name": "nonce",
"type": "uint256"
},
{
"name": "deadline",
"type": "uint256"
}
]
},
"domain": {
"name": "USD Coin",
"version": "2",
"chainId": 8453,
"verifyingContract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913"
},
"message": {
"owner": "0x4d2a422db44144996e855ce15fb581a477dbb947",
"spender": "0x000000000022d473030f116ddee9f6b43ac78ba3",
"value": "115792089237316195423570985008687907853269984665640564039457584007913129639935",
"nonce": 1,
"deadline": "1720033166"
},
"primaryType": "Permit"
}
},
"blockNumber": "16621609",
"buyAmount": "28520257810978",
"buyToken": "0x4200000000000000000000000000000000000006",
"fees": {
"integratorFee": null,
"zeroExFee": {
"amount": "150",
"token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"type": "volume"
},
"gasFee": {
"amount": "5842",
"token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"type": "gas"
}
},
"issues": {
"allowance": null,
"balance": null,
"simulationIncomplete": false,
"invalidSourcesPassed": []
},
"liquidityAvailable": true,
"minBuyAmount": "28434697037546",
"route": {
"fills": [
{
"from": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"to": "0x4200000000000000000000000000000000000006",
"source": "Solidly_V3",
"proportionBps": "10000"
}
],
"tokens": [
{
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"symbol": "USDC"
},
{
"address": "0x4200000000000000000000000000000000000006",
"symbol": "WETH"
}
]
},
"sellAmount": "99850",
"sellToken": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"target": "0x5ce929ddb01804bff35b2f5c77b735bdb094aac8",
"trade": {
"type": "settler_metatransaction",
"hash": "0xf8b1cea260453fabbeb8d38195e3f034b638714553084753bbe83f4d2aaa45ba",
"eip712": {
"types": {
"PermitWitnessTransferFrom": [
{
"name": "permitted",
"type": "TokenPermissions"
},
{
"name": "spender",
"type": "address"
},
{
"name": "nonce",
"type": "uint256"
},
{
"name": "deadline",
"type": "uint256"
},
{
"name": "slippageAndActions",
"type": "SlippageAndActions"
}
],
"EIP712Domain": [
{
"name": "name",
"type": "string"
},
{
"name": "chainId",
"type": "uint256"
},
{
"name": "verifyingContract",
"type": "address"
}
],
"TokenPermissions": [
{
"name": "token",
"type": "address"
},
{
"name": "amount",
"type": "uint256"
}
],
"SlippageAndActions": [
{
"name": "recipient",
"type": "address"
},
{
"name": "buyToken",
"type": "address"
},
{
"name": "minAmountOut",
"type": "uint256"
},
{
"name": "actions",
"type": "bytes[]"
}
]
},
"domain": {
"name": "Permit2",
"chainId": 8453,
"verifyingContract": "0x000000000022d473030f116ddee9f6b43ac78ba3"
},
"message": {
"permitted": {
"token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"amount": "100000"
},
"spender": "0x5ce929ddb01804bff35b2f5c77b735bdb094aac8",
"nonce": "2241959297937691820908574931991566",
"deadline": "1720032866",
"slippageAndActions": {
"recipient": "0x4d2a422db44144996e855ce15fb581a477dbb947",
"buyToken": "0x4200000000000000000000000000000000000006",
"minAmountOut": "28434697037546",
"actions": [
"0x0dfeb4190000000000000000000000005ce929ddb01804bff35b2f5c77b735bdb094aac8000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda0291300000000000000000000000000000000000000000000000000000000000186a00000000000000000000000000000000000006e898131631616b1779bad70bc0e0000000000000000000000000000000000000000000000000000000066859e62",
"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",
"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"
]
}
},
"primaryType": "PermitWitnessTransferFrom"
}
}
}
0x Settler Contracts
0x v2 is built on 0x Settler, a new set of smart contracts designed to enable the secure and continuous deployment of new features. 0x Settler uses Permit2 and the AllowanceHolder contracts to perform swaps without any passive allowances to the contract.
Read about the new 0x Settler. These contracts have been fully audited with four audits from three separate firms, including Ourovoros, Trail of Bits, OpenZeppelin, and Trail of Bits a second time.
Finding Addreses for 0x Settler Contracts
For v2, we strongly advise against hardcoding the entry point contract addresses as they will be dynamic and based on the current Settler deployment. The following are preferred ways to obtain the latest Settler address.
Option 1: Use value returned by transaction.to
- The entry point contracts returned in the APIs as
transaction.to(see the API references) will be dynamic and based on the current Settler deployment.
Option 2: Query the Settler address registry
Another option is to query the Settler address registry for the most recent contract address before building or signing a transaction. Two ways to do this are,
- Run this code to find the recent Settler deployment
- For a quick look up, use this dashboard of most recent Settler deployments
Option 3: (Least advised) Manual copy and paste addresses
The current address will always be returned in the API and we’ve published the current and next hundred Settler addresses below. However, querying the address registry is trustless and gives you the highest confidence that the Settler hasn’t been paused or rolled back.
For a comprehensive list of all Settler addresses,
- download the list here (.tar file)
- or, copy and paste the addresses below
List of addresses by chain
Ethereum (Mainnet)
Metatransactions
0x6D837c5f39D609b996aD4Ad45f744aD2Df93Fb57 0x4EE2d0B91084821B96365F93DA61cf86e10C42BB 0x7C39a136EA20B3483e402EA031c1f3C019bAb24b 0x25b81CE58AB0C4877D25A96Ad644491CEAb81048 0xAE11b95c8Ebb5247548C279A00120B0ACadc7451 0x12D737470fB3ec6C3DeEC9b518100Bec9D520144 0x9Ed181da6b359c3eE23c1D6912A6b4b0c349A165 0xd71baaCbCB10720b16a63620605cb4b962C47d20 0x13AE7caFFd0D83ac90C985F68c7dACc7c69f7b6B 0x8e3F00919aD73B4C525BE50E86718d86386AF944 0x42b17b6B6b93383d52F21Dc61546974E014241bf 0x1e1Ed00F1048C99240bB56defC20de44A0A005Cb 0xF1e84e766e694E33327916aAe9c7B81D2579a58a 0x99B97DCe3239A1E3009defC6FdfE2Ea91518FdcB 0x4ffe5502630d7d4a0eb490d526728B6d9E6BB902 0x0476C2483f4c6AA4Dfb6EFA29815AB74d9C1e508 0x82CC35Ea953c87dBE61d6B6feABD91371201d9Bb 0x04CCf43bf8dF40659414880603A8D8eF7F465Bea 0xEcc95D4bf74782c60009D5f645ADc75828A8F550 0x9A6350D532ed83a970D452b736bE5847b2856768 0x4EED8D2C762276D4B08d983341572a6A33Ec793D 0xe6Be0a39519f0e0A835f6b9Fa043E63C982f3d0d 0x3c61b0f7401D28cec201AD33c479006F2C1b029E 0x5e8eF329ad6693F205bd83bb2D0d76149fA6B300 0xfc919588f21a4D0C72628e231C564eF7e64eeB86 0xC6B233170c2C981067C62A54ec750f596fb1D9d9 0xCa512D4DF1CF671dB2D9f76FCA08c8212CAe60b6 0x69b35afBa134494aFE7660D85d993A72B16251D8 0x9625A4E9C7B7CF371AD3E0E1F7C8dA4CbDF7386A 0xDB190E40b317601Eb1351fBCE73EadBF1e61F968 0x0A5eC1AC6c2A831aa2910A63132e89Ec4A145691 0x9274875Fc18A256C1E9FD5754AA00402770B942D 0x626373AF01833181648B0473A68F37Bed404E742 0x8B65eF6fb63dCD0778EfDd92C91A43becc721006 0x033bf7d6C40655a739C6824aDb6900D09BA5b85b 0xfd4E51E81692d9f234fd40E8786169845a11297F 0x9e3c048c7E75B2e59E85F8Ec2B056fAe9d4aF0B1 0x4C487236d2DAbD23dBaDc8Bd1B6BE2564B4B4BAb 0xF14cCF481865274A31920D5190ced775CEcF6866 0x194B3054F99f8265dE4326e55a9EAc785a64249F 0xA50B0f896346403aE71fD6Ca3A36172BF8D17b63 0x282EC1FC8BB04FBb5c177AfC014404C25BDd7d94 0xaccfee8259f3b88657A68F84A979744481D98d94 0x6F05DbFc52f6664d319F55E1FB90F709803B9b30 0x1F8D2B3eB3b6B780d9CAED8342e55D7868fC95D1 0xC4c8DaC392555cA754c046Ab5e81B6F8361Aa19F 0xd0f76F850b75b84d3703Ea689fEe1dCcB0b5653c 0xe54Ce5A13AcCb7B7e3D6c41Bbe38F310033D74BC 0x5dac853757AEA92E611EDdE40ba6C121AdD5CB9F 0x1F108080dCD40876D83e7118625c379B313Ef551 0x3b6d0395F2385a676fb944e370dcDBb42d89aB4D 0xB2983E321dEa2fB0098D6915B768A3C5aE880b40 0x86bb16A88CdC866f9FcCFF3A716A726756050e60 0xFc40230b834A19EBB4922DA16B8EC9B9F2cAAb11 0xaC9Def627718C4F60Dd3914756Ae120772678fC4 0x30334f485E29fF65aB1Bc900C64967a77ADE9B1F 0xBb757B508dF8Cd6dD508f8F281703A1f6EC0824C 0x9Dc257827C35Ae952f13e21dD2Adc6FeC2D242F1 0x8b47128b32F52E2cDF45c6422e22a240605E733F 0x1053D3c9Bdf9E906Ba16851AcB09B2e8d98502B0 0x235F7812a5d869CF41c3f80e51CFfDB0b9D53A41 0x05e61cc80B4bc1Cd960914C6Cf3EE61856E41EDD 0xA8fb9E0e136ECf86D9B2221DF6Fc082a391C59da 0xa995c4A9f3cF931F9b0c8d5E106aF4A91A290221 0xAE5a945D8d39A1D69c1C3Bc8Fc6d9A8d58c801EF 0x0f380aa2e811b576ee121d17abc5C290eBdC8516 0xbeC7C509cBA3Ff9c31630f58aBcD5C262a7D52D6 0x5c6cA8C9ea04DD2f518B1Ed0d3580C9D9e70B028 0x80f709D44ADd2C2C13e4DABe913DAAC93E70f340 0xB5330b805DB182a4148b1423E4f5acBEb086bF6C 0x80a4dB7833bEAcC40c2aa5e9694C53Aaa3Bfba10 0x6d4f78717C78e185f156FEA879A57c6263d1d204 0xC5d0A32D0ad20a0C6207D7deD21c12c63D43AC8f 0xDF1414D5EaB5054E6870D67aD2C8049b3dbcccE7 0x3fc4F388fb25D1Af367742194B75072318932Ed3 0x7Cd501bB4103CC22b969FbC64f56f06C9Ec5850b 0x35011921Ab3A5AC3380D27a8Fc756F42C086c9ca 0x7cA68D4753B1358cbD42A75721801157C4b74d56 0xB0063c2A2f0b923acbC841a44010677cF254E549 0x1490E5692D83185670f0074fE3f6DD819E889A30 0xc9c8FABC86bBCE655a0A16B60A99c053219Ee43e 0x780094B8e93b54008308dB2497a0D0a538F5b080 0x40Aa49026dc230e271D5959657A3e6302de0a8F2 0xD1829122fC75E973146fB1C86CF81D57e5A29b77 0x40362c013F2566a6f5f120f91eB8F7396184ac0D 0x506a41040C468CF2faA523EAb185c564a395e8Bc 0xeCdD8Fdb27D0D574a86c61Fc3fEAFD049690334e 0x88a88A817B88dDa7F4e84F6560baE37Cced32e11 0x847eec7A70763744F564d7B229796aC8D3baec45 0x95b37C06877DE5DC10F1337365B5d495bDea3036 0xB2a001797Cb794573270d080cc4f2Eb2DAddDcdD 0x9B10d3644F161B9DF18cb25eAEf412Ccf3871e85 0xe7Db73D30FCdC0D32905517551560c1a93AFE728 0x85C46ac1e262Fdb4f936c159F3c367A19a3f1177 0x441255a452900EF26beAFcA41227A357537D0F6D 0x3D1494300FCE8235600ac867a039BC936a0Bc878 0xdcDdCD119654C91a903FB44eD9e13009bfa2C712 0x3E03a29854687d64c6cF95879dA98992A00a94B9 0x52D3BfC3e5af99a158ea7b3ED7F774Cd1a7E3B7F 0xc48B13CE7557a842e71e859618a4557aF71B4370
Taker
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Arbitrum
Metatransaction
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Taker
Avalanche
Metatransaction
Taker
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Base
Metatransaction
Taker
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BNB
Metatransaction
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Taker
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Optimism
Metatransaction
Taker
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Polygon
Metatransaction
Taker
In API v2, the allowance target and the entry point contract are different. The allowance target will either be the canonical Permit2 contract or the AllowanceHolder contract, depending on the allowance method you choose. When an allowance is needed, the correct address to set the allowance on will be returned in issues.allowance.spender.
The entry point contract is the contract to which you send the data. This address is returned in the response under transaction.to (see the API references), and it will dynamically change based on the current Settler deployment.
Permit2 Contract
Permit2 was developed by Uniswap, based on work from 0x alumnus Lawrence Forman. It provides a secure and efficient way to manage token approvals across multiple smart contracts. Permit2 is immutable, thoroughly audited, trusted by protocols like Uniswap, and backed by a $3M bug bounty.
When using the Swap API with Permit2, the Permit2 contract is the allowance target (also referred to as the spender or operator):
If the taker hasn’t granted an allowance, the Permit2 contract address will be returned in issues.allowance.spender. For example:
"issues": {
"allowance": {
"actual": "0",
"spender": "0x000000000022d473030f116ddee9f6b43ac78ba3"
},
}
How Permit2 Works
Permit2 combines two contracts:
- AllowanceTransfer: Simplifies token approvals by setting limits on time and value for approved contracts, reducing the burden on users.
- SignatureTransfer: Enables approvals that are not just time and value bound, but also single-use, which reduces allowance risk to virtually zero.
Permit2 supports any ERC20 token, including those that don’t have a native permit function. It also offers time-bound approvals to reduce the risk of open-ended token allowances, while single-use signature approvals fully eliminate passive allowance risk.
For more details, see this Permit2 explanation.
Who Should Use Permit2?
For most applications, we recommend using Permit2. This method requires two user signatures per trade:
- A signature for limited approval
- A signature for the trade itself
Permit2 is also recommended for setups involving multisig or smart contract wallets, as long as the smart contract supports EIP-1271, which most do.
Additionally, Permit2 is a standard that allows users to share token approvals across smart contracts. If a user has an infinite allowance set on Permit2 via another app, they don't need to reset the allowance.
Permit2 Address
Permit2 is deployed to 0x000000000022D473030F116dDEE9F6B43aC78BA3 across all chains. You can hardcode this address in your integration.
For more details, check out our guide for using Swap API with Permit2 and the Permit2 headless example.
AllowanceHolder Contract
We recommend using Permit2 for most situations. However, if your integration doesn't support a double-signature flow, such as with smart contracts that aren't compatible with EIP-1271, AllowanceHolder is a better choice. It works best for single-signature use cases, including:
- Projects integrating the Swap API into smart contracts without EIP-1271 support.
- Teams aggregating across multiple sources and aiming for a consistent user experience across all integrations.
If you're concerned about upgrade speed, consider using AllowanceHolder, as it closely resembles the 0x Swap v1 integration. This approach can help streamline the upgrade process for teams that previously used Swap v1.
For AllowanceHolder, use the following endpoints:
These endpoints use the AllowanceHolder contract, which sits in front of 0x Settler and maintains a one-way trust relationship. The AllowanceHolder is the allowance target (spender/operator) for these endpoints.
If the taker doesn't have an allowance set to the contract, the AllowanceHolder contract address will be returned in the issues object. For example,
"issues": {
"allowance": {
"actual": "0",
"spender": "0x0000000000001ff3684f28c67538d4d072c22734"
},
}
Key Benefits of AllowanceHolder
AllowanceHolder offers a convenient alternative to Permit2 with improved gas efficiency and single signature UX, along with all of the same security benefits.
With AllowanceHolder, all applications can eliminate allowance risk without sacrificing user experience. It offers the following,
- Single-signature user experience
- Maintains the same security benefits as Permit2
- Mitigates allowance risks without compromising user experience
Learn about the AllowanceHolder contract.
Who Should Use AllowanceHolder?
AllowanceHolder is ideal for teams that prefer not to use a double-signature UX. It’s particularly recommended for:
- Projects integrating Swap API into smart contracts.
- Teams aggregating across multiple sources and seeking a consistent user experience across integrations.
AllowanceHolder Address
The AllowanceHolder contract is deployed at different addresses, depending on the chain’s latest supported EVM hardfork. These addresses can be hardcoded in your integration:
0x0000000000001fF3684f28c67538d4D072C22734on chains supporting the Cancun hardfork (Ethereum Mainnet, Ethereum Sepolia, Polygon, Base, Optimism, Arbitrum, Blast, Bnb)0x0000000000005E88410CcDFaDe4a5EfaE4b49562on chains supporting the Shanghai hardfork (Avalanche, Scroll, Mantle)0x000000000000175a8b9bC6d539B3708EEd92EA6con chains supporting the London hardfork (Linea)
Follow our guide for Swap API with AllowanceHolder
Checkout the AllowanceHolder headless example
0x Order Types
An order is a message passed into the 0x Settler to facilitate a trade (see How does 0x work?). The order types that we support include:
| Order Type | Summary | Order Structure | Supported Token Trade Types |
|---|---|---|---|
| Limit Orders | These are the standard 0x Order, which encodes a possible trade between a maker and taker at a fixed price. | Limit Order Structure | ERC20 <-> ERC20 trade |
| RFQ Orders | These are a stripped down version of standard limit orders, supporting fewer fields and a leaner settlement process. These orders are fielded just-in-time, directly from market makers, during the construction of a swap quote on 0x API, and can be filled through the fillRfqOrder() function on the Exchange Proxy. | RFQ Order Structure | ERC20 <-> ERC20 trade |