Price Feed API

The Price Feed API provides real-time pricing information for Stable Mint tokens.

API Format

GET /v1/price/{chain}/{token}

Path Parameters

Parameter	Type	Description	Values
chain	string	Blockchain network	etherlink
token	string	Token symbol	usdsm, eursm

Response Format

Example Response

{
  "symbol": "USDSM",
  "contractAddress": "0x6bDE51212203aE5d592Cc5180DA2ABBd41c922dE",
  "price": "1.00",
  "priceCurrency": "USD",
  "timestamp": "2025-11-20T09:02:04.972",
  "version": "1.0",
  "signature": "WyAEj75t6D3i5lolnxsvcjF3oIZD0ElB0YbtCnsevvVpz4pofFTx1U0ZNBcZXUx7..."
}

TIP

The signature field contains a base64-encoded RSA signature. Full signature examples are shown in the validation section below.

Signature Validation

The signature field in the response is generated from the following payload components concatenated with pipe (|) separators:

symbol|price|priceCurrency|timestamp|version

JavaScript Validation Example

const crypto = require('crypto');

function validateSignature(response, publicKey) {
  // Construct the payload string
  const payload = `${response.symbol}|${response.price}|${response.priceCurrency}|${response.timestamp}|${response.version}`;

  // Create verifier
  const verifier = crypto.createVerify('RSA-SHA256');
  verifier.update(payload);

  // Verify signature
  const isValid = verifier.verify(
    publicKey,
    response.signature,
    'base64'
  );

  return isValid;
}

// Example usage
const response = {
  symbol: "EURSM",
  price: "1.00",
  priceCurrency: "EUR",
  timestamp: "2025-11-20T08:43:45.908",
  version: "1.0",
  signature: "cat1nQMbTZL1HrXuLoFSQNIMmf/bLLmdRS/L9fZkUPjHUZ+wHr+UOveX09QO4OIZjFmAQSlRUsJUeQ8DA/MTBb8klrh1YbnoulkrfHWtvKHwurRUY8WH/WhzdaT7bnaymOtRZIugO0utizlPezuVcUgodVOx9MCSW8Bv6wyuQ+LzHSwaE78jhGb6KyPW15avUtRnboGtSsBV/Hpvnly3CXpoFDyREguCoi2v209EG9JufVeIIhPZx3YiNsgsSCq9U2Z+/Wxn1VtkXs7er9jlZ1PnDchYjoMKybGJ9yGpxgpDqja7ps0LtCdbeO+4jubosl+RWo6T/BtdqLUtilB7bg=="
};

const publicKey = `-----BEGIN PUBLIC KEY-----
[PUBLIC KEY HERE]
-----END PUBLIC KEY-----`;

const isValid = validateSignature(response, publicKey);
console.log('Signature valid:', isValid);

Production Environment

Base URL: https://feed.stablemint.io

Public Key

The following public key should be used to validate the payload signature:

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtoGE5deMyvfEalpKsndv
bn7EWr9XAkQwkIK4X7877bMhk59+STQU5wFDjIRhnwePb2VqmGEFj0ddPDj4jPx7
cBxB0l0tC4bozP7YTbrEyvgGGVIhtGDm+PidQwnfTzJIu6n622zyeA0cakuzVTNK
7c2BELtsdyJoGTohQURZ/4A2hVnryfN3p641sLLwllA7D9Qme5f3JRhigGOI/MbU
UTPfz6GDxrEoyl3w8MNn5nO7h2yWjek0a2oCc9KxW4ENnjL8h2WQjYWMJCVKnvCn
7nA3GuJxMipHIm/ROtVsQ9ISBNGK7KynEpP1saaTApd5aSeYlTPex1IPTMYxxK80
HwIDAQAB
-----END PUBLIC KEY-----

Available Endpoints

USDSM on Etherlink

GET https://feed.stablemint.io/v1/price/etherlink/usdsm

EURSM on Etherlink

GET https://feed.stablemint.io/v1/price/etherlink/eursm

Example Request

curl https://feed.stablemint.io/v1/price/etherlink/eursm

Staging Environment

Base URL: https://feed.stablemint.net

Public Key

The following public key should be used to validate the payload signature:

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmRqV2da+VTB8tC6wIr+G
uEtCHrRkkDgG8V+VseT+LYSMz0NKzYVM1ArRQ6Iod0d3A+4D13HanB8Z6bPYHR3a
keGkVAJ5L5n8lIIjoME3ol+PGSl0CpmYrva8Q56kNHgUtNa6lztzoOnaWlYD9bgB
UY3ye1eVBuDg6mF1UFQgAWsIRbR+IvYuN9SVSI/sI0U5vdBc1HwwgF4CHuPJCcnO
mE09SdnSrEA7Uz/JFYydiJ7Dg4vxAhCpNnRW89fSbcBZjRbVTWQPcMWjgz71KcdL
0/lXICCNmro1P2F/yZGqz8xUK8MvnzJFdXIyH9PCzX7NQEnpfxeTxGHeHuoNg5XB
WQIDAQAB
-----END PUBLIC KEY-----

Available Endpoints

USDSM on Etherlink

GET https://feed.stablemint.net/v1/price/etherlink/usdsm

EURSM on Etherlink

GET https://feed.stablemint.net/v1/price/etherlink/eursm

Example Request

curl https://feed.stablemint.net/v1/price/etherlink/eursm