Web3 Wallet API: Address Validation, Transaction Retrieval, and Broadcast Services

In the fast-evolving world of blockchain and decentralized applications (dApps), developers need reliable, secure, and efficient tools to interact with digital wallets and on-chain data. The OKX Web3 Wallet API provides a comprehensive suite of services designed for seamless integration into your Web3 projects. This includes critical functionalities such as address validation, transaction information retrieval, and transaction broadcasting—all delivered through a robust, scalable, and developer-friendly API framework.

Whether you're building a decentralized exchange, NFT marketplace, or blockchain analytics platform, leveraging a powerful Wallet-as-a-Service solution can significantly accelerate development time while ensuring high accuracy and security.

Address Validation: Ensure Transaction Safety Before Execution

One of the most crucial steps in any blockchain transaction is verifying the recipient address. Sending funds to an invalid or malicious address can result in irreversible loss. The OKX Web3 API offers a secure address validation endpoint that checks both format correctness and potential security risks.

Endpoint Overview

Method: GET
URL: https://web3.okx.com/api/v5/wallet/pre-transaction/validate-address

This endpoint allows developers to validate an address against two key criteria:

Whether the address follows the correct format for the specified blockchain.
Whether the address appears on known blacklists, such as those associated with scams, phishing, or smart contract vulnerabilities.

👉 Validate any wallet address in seconds — ensure safety before every transaction.

Request Parameters

Parameter	Type	Required	Description
chainIndex	String	Yes	Unique identifier for the blockchain (e.g., Ethereum mainnet = "1")
address	String	Yes	The wallet or contract address to validate

Response Parameters

Parameter	Type	Description
addressType	String	`"0"`: Invalid format `"1"`: Valid user address `"2"`: Valid contract address
hitBlacklist	Boolean	`false`: Not flagged `true`: Identified in blacklist
tag	String	(Deprecated) Previously used to indicate threat type (e.g., "HoneyPot", "Phishing")

Sample Request

curl --location --request GET \
'https://web3.okx.com/api/v5/wallet/pre-transaction/validate-address?chainIndex=1&address=0xdf54b6c6195ea4d948d03bfd818d365cf175cfc2' \
--header 'Content-Type: application/json' \
--header 'OK-ACCESS-PROJECT: 86af********d1bc' \
--header 'OK-ACCESS-KEY: 37c541a1-****-****-****-10fe7a038418' \
--header 'OK-ACCESS-SIGN: leaV********3uw=' \
--header 'OK-ACCESS-PASSPHRASE: 1****6' \
--header 'OK-ACCESS-TIMESTAMP: 2023-10-18T12:21:41.274Z'

Sample Response

{
  "code": "0",
  "data": [
    {
      "addressType": "1",
      "hitBlacklist": true,
      "tag": "HoneyPot"
    }
  ],
  "msg": "success"
}

⚠️ In this example, although the address format is valid (addressType: 1), it has been flagged as a Honeypot scam, meaning users may be unable to withdraw funds after interacting with it. This early warning can prevent significant financial losses.

Retrieve Transaction Information: Real-Time On-Chain Data Access

Understanding transaction status and history is essential for user transparency and system reliability. With the OKX Web3 API, developers can programmatically retrieve detailed transaction records, including confirmation status, gas usage, and block inclusion details.

This functionality supports real-time balance tracking, audit logging, and dispute resolution—critical components for custodial and non-custodial wallet integrations alike.

While specific endpoints for transaction lookup are not detailed here, they typically support querying by:

Transaction hash
Wallet address
Block range or timestamp

Such features empower platforms to provide live updates, detect failed transactions, and enhance user experience with accurate blockchain insights.

Broadcast Transactions Securely and Efficiently

Once a transaction is signed locally (ensuring private keys never leave the user’s device), it must be broadcasted to the network. The OKX Web3 API includes a secure transaction broadcast service that relays signed raw transactions to the appropriate blockchain network.

This removes the need for developers to run their own nodes or manage complex node infrastructure, reducing latency and improving success rates.

Key benefits include:

High-availability relay networks
Support for multiple EVM-compatible chains
Built-in retry logic for dropped transactions
Fee optimization recommendations

👉 Streamline your dApp’s transaction flow with enterprise-grade broadcasting.

Core Use Cases and Integration Scenarios

1. DeFi Platforms

Ensure users don’t send tokens to scam contracts by validating addresses before swaps or deposits.

2. NFT Marketplaces

Prevent irreversible mistakes when users transfer rare digital assets by checking recipient addresses in real time.

3. Custodial Wallet Services

Automate compliance checks and risk scoring using blacklist detection during withdrawals.

4. Blockchain Analytics Tools

Enhance forensic capabilities by combining validation data with behavioral analysis.

Frequently Asked Questions (FAQ)

What blockchains are supported by the OKX Web3 Wallet API?

The API supports major EVM-compatible chains such as Ethereum, BSC, Polygon, Arbitrum, Optimism, and others. Chain support is continuously expanding; refer to official documentation for the latest list using chainIndex values.

Is there a rate limit on API calls?

Yes, rate limits apply based on your project tier. Standard plans allow thousands of requests per minute. For higher throughput needs, enterprise-level access is available upon request.

Can I use this API without exposing private keys?

Absolutely. The API is designed for secure interactions where private keys remain under user control. Signing occurs off-chain, and only signed transactions are submitted for broadcasting.

How accurate is the blacklist detection?

The blacklist database aggregates intelligence from global threat monitoring systems, smart contract audits, and community reports. While highly effective at identifying known threats like honeypots and phishing addresses, it cannot guarantee detection of brand-new scams.

Is the `tag` field still useful?

No. The tag field has been deprecated and may be removed in future versions. Developers should rely on hitBlacklist for security decisions and implement additional context-based risk assessment if needed.

Do I need an OKX account to use these APIs?

Yes. You must create a project in the OKX Web3 Services dashboard to obtain credentials like OK-ACCESS-KEY, PROJECT_ID, and signing permissions required for authentication.

Optimize Your Web3 Development Workflow

By integrating the OKX Web3 Wallet API, developers gain access to mission-critical infrastructure without managing backend complexity. From preventing costly user errors to enabling smooth transaction processing, these tools form the backbone of modern decentralized applications.

With strong emphasis on security, reliability, and developer experience, this API suite helps you build trust with end-users while accelerating time-to-market.

👉 Start building smarter, safer Web3 apps today — explore full API capabilities now.

Core Keywords:
Web3 Wallet API, Address Validation, Transaction Broadcast, Blockchain Security, Wallet-as-a-Service, Smart Contract Verification, DeFi Integration, On-Chain Data Retrieval