Vault check API - Squads Multisig

Check if a given address maps to a Squad vault. This endpoint verifies whether a Solana address is a valid Squads V3 or V4 vault account that can receive funds.

Endpoint

https://4fnetmviidiqkjzenwxe66vgoa0soerr.lambda-url.us-east-1.on.aws/isSquad/<ADDRESS>

Quick example

Request:

https://4fnetmviidiqkjzenwxe66vgoa0soerr.lambda-url.us-east-1.on.aws/isSquad/HFwi9HgNtFcMwNJPHa1czrPhuxeZFZ7G9tPQ1LqAd7sy

Response:

{
  "isSquad": true,
  "version": "v4"
}

Response fields

Field	Type	Description
`isSquad`	`boolean`	Whether the address is a valid Squads vault
`version`	`string`	Squads program version (`v3`, `v4`, or empty if not a vault)

Usage notes

ATA validation. This endpoint does not check for ATA validity. When sending SPL tokens, verify the ATA separately.
Rate limit. 25 requests per second.
Frontend usage. Don’t expose the endpoint URL on your frontend. Use SSR or proxy it through your own server.
Caching. Cache responses to avoid polling the same addresses repeatedly.

Integration examples

Basic
With caching

async function checkVault(address: string): Promise<boolean> {
  const response = await fetch(
    `https://4fnetmviidiqkjzenwxe66vgoa0soerr.lambda-url.us-east-1.on.aws/isSquad/${address}`
  );
  const data = await response.json();
  return data.isSquad;
}

const vaultCache = new Map<string, { isSquad: boolean; version: string }>();

async function checkVaultCached(address: string) {
  if (vaultCache.has(address)) {
    return vaultCache.get(address);
  }

  const response = await fetch(
    `https://4fnetmviidiqkjzenwxe66vgoa0soerr.lambda-url.us-east-1.on.aws/isSquad/${address}`
  );
  const data = await response.json();

  vaultCache.set(address, data);
  return data;
}