Mainnet contracts

The addresses below are the production NEAR Auth deployment on NEAR mainnet. Use them when you configure an SDK or inspect on-chain activity in an explorer.

Mainnet access is gated. You must be whitelisted before your app can authenticate real users against this deployment. Apply for production access — or build against the open testnet contracts first, which need no sign-off.

Contract addresses

Contract	Account id	Description
NEAR Auth	`fast-auth.near`	The entry-point contract. Verifies a JWT through a guard and requests an MPC signature.
JWT Guard Router	`jwt.fast-auth.near`	Registry that routes a `guard_id` to the guard contract responsible for verifying the JWT.
Auth0 Guard	`auth0.jwt.fast-auth.near`	Guard that RS256-verifies Auth0 JWTs and validates the `iss`, `aud`, and `fatxn` claims.
MPC signer	`v1.signer`	NEAR’s Multi-Party Computation network. Produces signatures from distributed key shares.

On mainnet, auth0.jwt.fast-auth.near is also the Auth0 signing audience — every JWT the guard verifies must list it in the aud claim. See the Auth0 concept for details.

Network information

Setting	Value
Network	NEAR Mainnet
Chain id	`mainnet`
RPC endpoint	`https://rpc.mainnet.near.org`
Explorer	nearblocks.io

When you construct a client, point near-api-js at the mainnet RPC and pass the mainnet account ids:

main.ts

import { FastAuthClient } from "@fast-auth-near/browser-sdk";
import { JavascriptProvider } from "@fast-auth-near/javascript-provider";
import { connect } from "near-api-js";

const provider = new JavascriptProvider({
  network: "mainnet",
  clientId: "your-auth0-client-id",
});

const { connection } = await connect({
  networkId: "mainnet",
  nodeUrl: "https://rpc.mainnet.near.org",
});

const client = new FastAuthClient(provider, connection, {
  fastAuthContractId: "fast-auth.near",
  mpcContractId: "v1.signer",
});

The MPC signer derives each user’s key at the path {guard_id}#{sub}, so the same login always controls the same NEAR account across sessions.

Next steps

Apply for mainnet access

Get whitelisted to authenticate real users in production.

Testnet contracts

The open deployment for building and testing without approval.

Network configuration

RPC URLs, chain ids, and explorers side by side.

Deployments

Reference

Contract addresses

Network information

Next steps

Apply for mainnet access

Testnet contracts

Network configuration

​Contract addresses

​Network information

​Next steps

Apply for mainnet access

Testnet contracts

Network configuration

Contract addresses

Network information

Next steps