unionlabs/union · error · Error

Invalid gas price string

Error message

Invalid gas price string

What it means

Thrown by the patched GasPrice.fromString in @cosmjs/stargate when the input does not match ^([0-9.]+)([a-zA-Z][a-zA-Z0-9/:._-]*)$ — i.e. it is not <decimal amount immediately followed by denom starting with a letter>. The regex rejects separators, signs, and scientific notation before checkDenom ever runs.

Source

Thrown at patches/@cosmjs__stargate.patch:81

-    toString() {
-        return this.amount.toString() + this.denom;
+  constructor(amount, denom) {
+    this.amount = amount
+    this.denom = denom
+  }
+  /**
+   * Parses a gas price formatted as `<amount><denom>`, e.g. `GasPrice.fromString("0.012utoken")`.
+   *
+   * The denom must match the Cosmos SDK 0.42 pattern (https://github.com/cosmos/cosmos-sdk/blob/v0.42.4/types/coin.go#L599-L601).
+   * See `GasPrice` in @cosmjs/stargate for a more generic matcher.
+   *
+   * Separators are not yet supported.
+   */
+  static fromString(gasPrice) {
+    // Use Decimal.fromUserInput and checkDenom for detailed checks and helpful error messages
+    const matchResult = gasPrice.match(/^([0-9.]+)([a-zA-Z][a-zA-Z0-9/:._-]*)$/)
+    if (!matchResult) {
+      throw new Error("Invalid gas price string")
     }
+    const [_, amount, denom] = matchResult
+    checkDenom(denom)
+    const fractionalDigits = 18
+    const decimalAmount = math_1.Decimal.fromUserInput(amount, fractionalDigits)
+    return new GasPrice(decimalAmount, denom)
+  }
+  /**
+   * Returns a string representation of this gas price, e.g. "0.025uatom".
+   * This can be used as an input to `GasPrice.fromString`.
+   */
+  toString() {
+    return this.amount.toString() + this.denom
+  }
 }
-exports.GasPrice = GasPrice;
+exports.GasPrice = GasPrice
 function calculateFee(gasLimit, gasPrice) {

View on GitHub (pinned to 031785bb6d)

Solutions

1. Normalize the string: trim whitespace and remove thousands/decimal separators, e.g. gasPrice.trim().replace(",", ".") then strip any space between amount and denom
2. Use the plain <amount><denom> form: "0.025uatom"
3. Validate against the pattern before passing it into client creation

Example fix

// before
const gasPrice = GasPrice.fromString("0.025 uatom") // throws

// after
const gasPrice = GasPrice.fromString("0.025uatom") // amount and denom joined, no separators

const GAS_PRICE_PATTERN = /^([0-9.]+)([a-zA-Z][a-zA-Z0-9/:._-]*)$/
const normalizeGasPrice = (input: string) =>
  input.trim().replace(/\s+/g, "").replace(/,/g, ".") // "0.025 uatom" -> "0.025uatom"

const normalized = normalizeGasPrice(userInput)
if (!GAS_PRICE_PATTERN.test(normalized)) {
  throw new Error(`Gas price must be <amount><denom>, got: ${userInput}`)
}
const gasPrice = GasPrice.fromString(normalized)

const isGasPriceString = (s: string): s is `${number}${string}` =>
  /^[0-9.]+[a-zA-Z][a-zA-Z0-9/:._-]*$/.test(s)

try {
  const gasPrice = GasPrice.fromString(raw)
} catch (error) {
  if ((error as Error).message === "Invalid gas price string") {
    // strip whitespace/separators, reject negatives & scientific notation, then retry once
  }
  throw error
}

When it happens

Trigger: Gas price strings like "0.5 uatom" (space), "1,5utoken" (comma separator), "-0.1uatom" (negative), "1e-6uatom" (scientific notation), "uatom" or "0.025" alone, or a denom starting with a digit or slash.

Common situations: User-entered gas prices from forms pasted with whitespace; locale-formatted decimals using commas; config files storing gas price with units separated; negative or exponent notation from calculators.

Related errors

• Denom must be between 2 and 128 characters
• Malformed response
• NOT IMPLEMENTED
• Invalid Sui signer: expected Ed25519Keypair
• Invalid Aptos transport

AI-assisted analysis of unionlabs/union@031785bb6d (2026-08-16). Data as JSON: /api/errors/392751731dca4753. Report an issue: GitHub.