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GET
/
v1
/
metadata
/
gas-policies
Get Gas Policies
curl --request GET \
  --url https://api.example.com/v1/metadata/gas-policies \
  --header 'X-Access-Key: <x-access-key>' \
  --header 'X-Signature: <x-signature>' \
  --header 'X-Timestamp: <x-timestamp>'
{
  "gasPolicies": [
    {}
  ]
}

​
Get Gas Policies

Retrieve current gas pricing and estimation policies for supported chains.

​
Authentication

​
X-Access-Key
string
required
API access key
​
X-Signature
string
required
HMAC-SHA256 signature
​
X-Timestamp
string
required
ISO 8601 timestamp

​
Query Parameters

​
chainId
string
Filter by chain identifier

​
Response

​
gasPolicies
array
Array of gas policy configurations

​
Example

curl -X GET "https://api.axonvault.io/v1/metadata/gas-policies?chainId=eip155:1" \
  -H "X-Access-Key: ak_live_abc123" \
  -H "X-Signature: sha256=..." \
  -H "X-Timestamp: 2024-01-15T10:30:00Z"
Response: 
{
  "gasPolicies": [
    {
      "chainId": "eip155:1",
      "chainName": "Ethereum Mainnet",
      "eip1559": true,
      "currentGas": {
        "baseFee": "15000000000",
        "maxPriorityFee": {
          "slow": "1000000000",
          "standard": "1500000000",
          "fast": "2500000000"
        },
        "maxFee": {
          "slow": "20000000000",
          "standard": "25000000000",
          "fast": "35000000000"
        }
      },
      "gasLimits": {
        "transfer": "21000",
        "erc20Transfer": "65000",
        "erc20Approve": "46000",
        "swap": "200000"
      },
      "updatedAt": "2024-01-15T10:30:00Z"
    },
    {
      "chainId": "eip155:8453",
      "chainName": "Base",
      "eip1559": true,
      "currentGas": {
        "baseFee": "100000000",
        "maxPriorityFee": {
          "slow": "10000000",
          "standard": "50000000",
          "fast": "100000000"
        },
        "maxFee": {
          "slow": "150000000",
          "standard": "200000000",
          "fast": "300000000"
        }
      },
      "gasLimits": {
        "transfer": "21000",
        "erc20Transfer": "65000",
        "erc20Approve": "46000",
        "swap": "200000"
      },
      "updatedAt": "2024-01-15T10:30:00Z"
    }
  ]
}

​
Gas Speed Tiers

TierDescriptionTypical Confirmation
slowLower priority, cheaper5-10 minutes
standardNormal priority1-3 minutes
fastHigh priority< 1 minute

​
Using Gas Estimates

When building transactions, you can use these values: 
const gasPolicy = gasPolicies.find(p => p.chainId === 'eip155:1');

const txParams = {
  maxFeePerGas: gasPolicy.currentGas.maxFee.standard,
  maxPriorityFeePerGas: gasPolicy.currentGas.maxPriorityFee.standard,
  gasLimit: gasPolicy.gasLimits.transfer
};