Dynamic Gas Pricing

Some chains implement dynamic gas pricing through fee market modules. Instead of hardcoding a gas price, CosmJS can query the current base fee from the chain and adjust automatically. This is supported for:

Osmosis — EIP-1559 style fee market (/osmosis.txfees.v1beta1.Query/GetEipBaseFee)
Skip feemarket — used by Cosmos Hub and other chains (/feemarket.feemarket.v1.Query/GasPrices)

Configuration

Pass a DynamicGasPriceConfig instead of a static GasPrice:

import {
  SigningStargateClient,
  GasPrice,
  DynamicGasPriceConfig,
} from "@cosmjs/stargate";

const dynamicConfig: DynamicGasPriceConfig = {
  denom: "uatom",
  minGasPrice: GasPrice.fromString("0.005uatom"),
  maxGasPrice: GasPrice.fromString("0.1uatom"),
  multiplier: 1.3,
};

const client = await SigningStargateClient.connectWithSigner(
  "https://rpc.my-chain.network",
  wallet,
  { gasPrice: dynamicConfig },
);

const result = await client.signAndBroadcast(address, messages, "auto");

How It Works

When "auto" fee is used with a DynamicGasPriceConfig:

The chain’s fee module is queried for the current base gas price (Osmosis uses /osmosis.txfees.v1beta1.Query/GetEipBaseFee; other chains use Skip’s /feemarket.feemarket.v1.Query/GasPrices)
The multiplier is applied (default 1.3x) to stay above the minimum
The result is clamped between minGasPrice and maxGasPrice
If the query fails, minGasPrice is used as a fallback

DynamicGasPriceConfig Fields

Field	Type	Required	Description
`denom`	`string`	Yes	Token denomination to query the gas price for
`minGasPrice`	`GasPrice`	Yes	Floor price (also used as fallback if the query fails)
`maxGasPrice`	`GasPrice`	No	Ceiling price. If not set, no maximum is enforced
`multiplier`	`number`	No	Multiplier on the queried price. Defaults to 1.3

Checking Support

You can verify whether a chain supports dynamic gas pricing before configuring it:

import { checkDynamicGasPriceSupport } from "@cosmjs/stargate";

const supported = await checkDynamicGasPriceSupport(
  queryClient,
  "uatom",
  "cosmoshub-4",
);

Getting Gas Prices from the Chain Registry

CosmJS does not integrate with the Cosmos Chain Registry directly, but you can use it as a source for gas prices. The registry publishes recommended gas prices for each chain in its chain.json files.

Fetching from the Chain Registry

import { GasPrice } from "@cosmjs/stargate";

const registryUrl =
  "https://raw.githubusercontent.com/cosmos/chain-registry/master/cosmoshub/chain.json";
const response = await fetch(registryUrl);
const chainInfo = await response.json();

const feeToken = chainInfo.fees.fee_tokens.find(
  (t: any) => t.denom === "uatom",
);

const gasPrice = GasPrice.fromString(
  `${feeToken.average_gas_price}${feeToken.denom}`,
);

The chain registry typically provides three gas price tiers per token:

Field	Description
`low_gas_price`	Minimum price — may be rejected during congestion
`average_gas_price`	Recommended default
`high_gas_price`	For priority during high traffic

Using average_gas_price is a reasonable default. Use high_gas_price for time-sensitive transactions.

Libraries That Wrap the Registry

Several community libraries provide typed access to the chain registry:

chain-registry — typed chain registry data as an npm package
@chain-registry/client — client with fetching and caching

These are external packages, not part of CosmJS.

CosmJS

Concepts

Guides

API Reference

Configuration

How It Works

DynamicGasPriceConfig Fields

Checking Support

Getting Gas Prices from the Chain Registry

Fetching from the Chain Registry

Libraries That Wrap the Registry

​Configuration

​How It Works

​DynamicGasPriceConfig Fields

​Checking Support

​Getting Gas Prices from the Chain Registry

​Fetching from the Chain Registry

​Libraries That Wrap the Registry

Configuration

How It Works

DynamicGasPriceConfig Fields

Checking Support

Getting Gas Prices from the Chain Registry

Fetching from the Chain Registry

Libraries That Wrap the Registry