Get Gas Price
Fetch current gas prices for an EVM chain from the b3 gas oracle. Returns legacy tiers (low / standard / fast / instant) and, when available, EIP-1559 base fee + priority/max-fee tiers and historical analysis (level, percentile, vs1h/vs4h/vs24h ratios). Values are in gwei. Ideal for: gas-gated batching, cost-aware send timing, gas dashboards.
Catalog action EVM Onchain
Fetch current gas prices for an EVM chain from the b3 gas oracle. Returns legacy tiers (low / standard / fast / instant) and, when available, EIP-1559 base fee + priority/max-fee tiers and historical analysis (level, percentile, vs1h/vs4h/vs24h ratios). Values are in gwei. Ideal for: gas-gated batching, cost-aware send timing, gas dashboards.
At a Glance
| Field | Value |
|---|---|
| Action ID | get-gas-price |
| Category | EVM Onchain |
| Connector | Not required |
| Requires gas | No |
| Funds movement | None declared |
| Tags | evm, gas, oracle, read |
Payload Schema
| Field | Type | Required | Description |
|---|---|---|---|
chainId | number | Yes | EVM chain ID. Supported chains depend on the gas oracle's coverage; unsupported IDs return UNSUPPORTED_CHAIN. |
Result Schema
| Field | Type | Required | Description |
|---|---|---|---|
chainId | number | Yes | - |
chainName | string | Yes | Human-readable chain name (e.g., 'Ethereum') |
blockNumber | number | Yes | Block number the snapshot was taken at |
timestamp | string | Yes | ISO timestamp of the snapshot |
source | string | Yes | Underlying data source string returned by the oracle. May vary across chains and over time. |
gasPrice | object | Yes | Legacy gas-price tiers in gwei. Use these for non-EIP-1559 chains. |
eip1559 | object | No | EIP-1559 base fee + tip tiers (gwei). Omitted on chains without EIP-1559 (e.g., BSC). |
analysis | object | No | Historical context for the current gas price. Use this for relative thresholds (e.g., 'send when gas is 30% below 24h median'). |
cached | boolean | No | True if the response was served from cache |
stale | boolean | No | True if the cached value has exceeded its freshness window |
cacheAge | number | No | Age of the cached value, in seconds |
Examples
json{ "type": "get-gas-price", "payload": { "chainId": 8453 }, "children": []}
bashcurl -X POST "https://api.b3os.org/v1/actions/get-gas-price/test" \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "inputs": { "chainId": 8453 }}'
Payload fields can use workflow expressions such as {{$trigger.body.amount}}, {{$nodes.fetch.result.price}}, and {{$props.asset}} when the value should come from a trigger, prior node, or reusable workflow prop.