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Session Token and Wallet Signing

Fetch Session Token and Auth with Wallet

Fetching a Session

In order to start the authentication process with Ratio you must provide the library with a function that will call Ratio's API.


An async function that calls your backend to return the session token from the /v1/clients/session API.
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The Ratio API uses client authentication which requires a client_id and client_secret. This client secret should be treated securely and should be protected within your backend.
const fetchSessionToken = async () => {
try {
let sessionTokenResponse = await fetch(
method: 'POST',
body: JSON.stringify({
signingAddress: walletAddress,
depositAddress: walletAddress,
signingNetwork: walletNetwork,
let data = await sessionTokenResponse.json();
} catch (e) {
return null;
fetchSessionToken={async () => {
return await fetchSessionToken();

Wallet Signing

Ratio uses wallet authentication in order to link your client wallet to a Ratio user's account. To set up this authentication method you must provide the Ratio React Native Library with a signingCallback.
The signing callback is an async function that accepts a string that contains the challenge that is returned from the Ratio /v1/auth/cryptoWallet:start call (documentation). This will allow you to perform asynchronous activities, such as a biometrics check, during the signing.
The return value from this function is of type RatioKitSigningResult. See the Models section.
For example, using the Web3.js library
signingCallback={async (challenge: string) => {
let sign = web3.eth.accounts.sign(challenge, privateKey);
return Promise.resolve({
signature: sign.signature,

Sequence diagram