API authentication

All API requests must be authenticated using ECDSA signature-based authentication. You’ll use your Integrator Private Key to sign each request and include the signature in the request headers.

Authentication Headers

Each API request requires the following headers:

Header	Description
`X-Pubkey`	Your public key derived from your private key (hex format with `0x` prefix)
`X-Timestamp`	Current Unix timestamp in seconds
`X-Signature`	ECDSA signature of the request (DER-encoded hex with `0x` prefix)
`Content-Type`	Must be `application/json`

Use our Integrator SDK
Manual implementation

Our Integrator SDK provides a convenient way to generate the authentication headers for your API requests.The getStamp method returns an object containing the required authentication headers (X-Pubkey, X-Timestamp, X-Signature, and Content-Type) that you can include in your API request.

Installation

npm install @byzantine/integrator-sdk

Initialize the Byzantine Client

import { ByzantineClient } from '@byzantine/integrator-sdk';

const client = new ByzantineClient({
  integratorPrivateKey: 'YOUR_INTEGRATOR_PRIVATE_KEY',
});

Usage example

Use the getStamp method to generate authentication headers for your API requests:

const payload = {
  // Your request payload
};

// Generate the api key stamp
const apiKeyStamp = await client.apiKey.getStamp(
  "POST",
  "/v1/submit/send-transaction-otp",
  payload
);

// Use the apiKeyStamp headers in your API call
const response = await fetch(
  "https://api.byzantine.fi/v1/submit/send-transaction-otp?chain_id=1",
  {
    method: "POST",
    headers: apiKeyStamp,
    body: payload,
  }
);

Signature Generation

The signature is generated by:

Constructing a message string in the format: {timestamp}{method}{path_and_query}{body}

timestamp: Unix timestamp in seconds
method: HTTP method in uppercase (e.g., GET, POST)
path_and_query: Full path including query parameters (e.g., /query/get-deposit?chain_id=1)
body: JSON stringified request body (empty string for GET requests)

Hashing the message using SHA-256
Signing the hash with your private key using ECDSA (secp256k1 curve)
Encoding the signature in DER format and converting to hex

Implementation Example

Here’s a reference implementation in Node.js:

import elliptic from "elliptic";
import { createHash } from "crypto";

const EC = elliptic.ec;
const ec = new EC("p256");

const INTEGRATOR_PRIVATE_KEY = process.env.INTEGRATOR_PRIVATE_KEY;

export function generateHeaders(method, pathAndQuery, body = "") {
  // Get the key pair
  const cleanPrivateKey = INTEGRATOR_PRIVATE_KEY.replace(/^0x/, "");
  const keyPair = ec.keyFromPrivate(cleanPrivateKey, "hex");
  const publicKey = "0x" + keyPair.getPublic(true, "hex");

  // Get the timestamp in seconds since the Unix epoch (UTC)
  const timestamp = Math.floor(Date.now() / 1000).toString();

  // Build the message to sign
  // Format: {timestamp}{method}{path_and_query}{body}
  const bodyStr = typeof body === "object" ? JSON.stringify(body) : body;
  const message = `${timestamp}${method.toUpperCase()}${pathAndQuery}${bodyStr}`;

  // Hash the message and sign it
  const messageHash = createHash("sha256").update(message).digest();
  const signature = keyPair.sign(messageHash);

  // Encode the signature in DER then in hex
  const signatureHex = "0x" + signature.toDER("hex");

  return {
    "X-Pubkey": publicKey,
    "X-Timestamp": timestamp,
    "X-Signature": signatureHex,
    "Content-Type": "application/json",
  };
}

Usage Example

// Example POST request
const body = {
  userId: "user123",
  vaultAddress: "0x...",
};
const headers = generateHeaders("POST", "/submit/deposit", body);

// Make the API call
const response = await fetch("https://api.byzantine.fi/submit/deposit", {
  method: "POST",
  headers: headers,
  body: JSON.stringify(body),
});

Keep your Integrator Private Key secure!

Managing your integrator keys

You can manage your integrator credentials programmatically — there’s no need to contact us to rotate or scope a key. Each credential is an ECDSA keypair with an access scope:

read_write — full access, including mutations and key management.
read_only — restricted to read/query endpoints.

Action	Endpoint
Inspect the current credential’s id, scope & capabilities	`GET /v1/integrator/whoami`
Issue a new credential	`POST /v1/integrator/credentials`
Update a credential’s label, scope, or active status	`PATCH /v1/integrator/credentials/{pubkey}`
Delete a credential	`DELETE /v1/integrator/credentials/{pubkey}`

You can call these endpoints directly, or use the Byzantine SDK’s typed method wrappers to manage your keys without building the requests by hand.

Managing keys requires a read_write credential, and a credential can’t deactivate, rescope, or delete itself, so you always keep at least one working read-write key.

OpenAPI Specification

Explore the full structure and generate your own client using our OpenAPI specification.

Integrator API

API endpoints

Authentication Headers

Installation

Initialize the Byzantine Client

Usage example

Signature Generation

Implementation Example

Usage Example

Managing your integrator keys

OpenAPI Specification

​Authentication Headers

​Installation

​Initialize the Byzantine Client

​Usage example

​Signature Generation

​Implementation Example

​Usage Example

​Managing your integrator keys

​OpenAPI Specification

Authentication Headers

Installation

Initialize the Byzantine Client

Usage example

Signature Generation

Implementation Example

Usage Example

Managing your integrator keys

OpenAPI Specification