Transaction Metadata (CIP-20)

Learn how to add metadata to a Cardano transaction according to CIP-20 using the Anvil API.

https://github.com/Cardano-Forge/anvil-api-examples/blob/main/utils/constant.ts

// See Authentication page for API key details.
export const X_API_KEY = "testnet_EyrkvCWDZqjkfLSe1pxaF0hXxUcByHEhHuXIBjt9";
export const NETWORK = "preprod";
export const API_URL = `https://${NETWORK}.api.ada-anvil.app/v2/services`;
export const HEADERS = {
  "Content-Type": "application/json",
  "x-api-key": X_API_KEY,
};

https://github.com/Cardano-Forge/anvil-api-examples/blob/main/documentation-references/cip-20.ts

// deno run --allow-net cip-20.ts

import { API_URL, HEADERS } from "../utils/constant.ts";

const ADDR =
  "addr_test1qrydyk6uw6cehk5u3zspyz3dhnwzmhfls2fp42vv5dv9g2z3885pg4kpkn30ptezc855lu3w5ey93zcr5lrezjmwkftqg8xvge";

const BODY = {
  changeAddress: ADDR,
  message: ["Receipt 42", "2025-03-12"],
};

const response = await fetch(`${API_URL}/transactions/build`, {
  method: "POST",
  headers: HEADERS,
  body: JSON.stringify(BODY),
});

console.log(await response.json());

// Expected output
// {
//   hash: "b2431ba925d55f3a117b4dd7d388b21277c6f89a27bfdc3895c10cae1dfcca7f",
//   complete: "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",
//   stripped: "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",
//   witnessSet: "a100d9010281825820cfd1cfc82efa73c76302b9103f81b4c1fb2e9dc0ed39ab45039fb6d4c3fbe7a35840f32d960934a6511cb120a61dd8283a60ded05026e4b9e682aa3583a3c7d6be84b0749c3e86e4f226f5aa461869b8b9dc2fca81684a872f101691eedbbcd92c0a",
//   auxiliaryData: "a11902a2a1636d7367826a526563656970742034326a323032352d30312d3234"
// }

Learn More

For a detailed overview of the transaction lifecycle, see the Transaction Guide.