Crypto APIs

Overview

This node interacts with the Crypto APIs REST API to retrieve the next available nonce for an Ethereum Virtual Machine (EVM) address. The nonce is a crucial value in blockchain transactions, representing the number of confirmed transactions sent from a given address. This operation helps users determine the correct nonce to use for their next transaction, preventing issues like transaction replacement or rejection.

Common scenarios where this node is beneficial include:

• Preparing to send a new transaction on an EVM-compatible blockchain by fetching the current nonce.
• Managing multiple transactions programmatically to ensure proper sequencing.
• Monitoring wallet activity and transaction counts.

For example, before sending a transaction from an Ethereum address, you can use this node to get the next nonce to include in the transaction payload.

Properties

Output

The node outputs JSON data containing the next available nonce for the specified EVM address. The exact structure depends on the API response but typically includes fields such as:

• nonce: The next available nonce number for the address.
• Additional metadata related to the request or blockchain state may also be included.

The output does not include binary data.

Dependencies

• Requires an active connection to the Crypto APIs REST API.
• Needs an API key credential configured in n8n for authentication.
• The node reads a local OpenAPI specification file (2024-12-12-final.json) bundled with the node to dynamically build requests.

Troubleshooting

• Operation Not Found Error: If the node throws an error stating the operation was not found, ensure that the "Resource" and "Operation" parameters are correctly set to "addresses-latest" and "Get Next Available Nonce EVM" respectively.
• Invalid Address or Network: Providing an incorrect blockchain, network, or address may result in API errors or empty responses. Verify these inputs carefully.
• API Authentication Errors: Ensure the API key credential is valid and has sufficient permissions.
• Rate Limits: The Crypto APIs service may enforce rate limits; if exceeded, requests might fail temporarily.
• Context Parameter Usage: Since the context parameter is optional and its usage depends on the API, omitting it usually does not cause errors.

Links and References

• Crypto APIs Documentation
• Ethereum Nonce Explanation
• EVM Compatible Chains Overview