SMS OTP Signer - Crossmint Docs

You are viewing docs for the previous version of the Wallets SDK. We recommend upgrading to V1. See the updated version of this page or the V1 migration guide.

Use an SMS OTP signer to let users authenticate via a one-time password delivered by SMS or optionally WhatsApp. Phone signers can be configured as a recovery signer (to regain wallet access on a new device) or as an operational signer (to authorize day-to-day transactions). A wallet can have multiple phone signers. For a conceptual overview, see SMS OTP in the Wallet Signers guide. To learn how to register operational signers on a wallet, see Registering a signer.

Configuration

React
Node.js
React Native
REST

import { useWallet } from '@crossmint/client-sdk-react-ui';

const { getOrCreateWallet } = useWallet();

const wallet = await getOrCreateWallet({
    chain: "base",
    signer: {
        type: "phone",
        phone: "+1234567890"
    },
});

import { CrossmintWallets, createCrossmint } from "@crossmint/wallets-sdk";

const crossmint = createCrossmint({
    apiKey: "<your-server-api-key>",
});
const crossmintWallets = CrossmintWallets.from(crossmint);

const wallet = await crossmintWallets.createWallet({
    chain: "base",
    signer: {
        type: "phone",
        phone: "+1234567890"
    },
});

import { useWallet } from '@crossmint/client-sdk-react-native-ui';

const { getOrCreateWallet } = useWallet();

const wallet = await getOrCreateWallet({
    chain: "base",
    signer: {
        type: "phone",
        phone: "+1234567890"
    },
});

curl --request POST \
    --url https://staging.crossmint.com/api/2025-06-09/wallets \
    --header 'Content-Type: application/json' \
    --header 'X-API-KEY: <x-api-key>' \
    --data '{
        "chainType": "evm",
        "config": {
            "adminSigner": {
                "type": "phone",
                "phone": "+1234567890"
            }
        }
    }'

Email OTP Signer Passkey Signer

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​Configuration

Configuration