API Reference

Complete reference for the WDK Indexer REST API

Base URL

API Base URL

https://wdk-api.tether.io

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Authentication

All requests require a valid API key in the x-api-key header:

Authentication Header

x-api-key: your-api-key-here

Don't have an API key yet? Request one by following the steps in our Get Started guide.

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Rate Limiting

Endpoint	Limit
GET /api/v1/health	10 req / 1 hour
GET /api/v1/chains	60 req / 1 min
GET /api/v1/:blockchain/:token/:address/token-balances	4 req / 10s
GET /api/v1/:blockchain/:token/:address/token-transfers	8 req / 10s

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API Endpoints

Health check endpoint

get

Check if the API server is running

Responses

200

Default Response

application/json

get

/api/v1/health

HTTPcURLJavaScriptPython

GET /api/v1/health HTTP/1.1
Host: wdk-api.tether.io
Accept: */*

200

Default Response

{
  "status": "ok",
  "timestamp": "2026-02-17T01:39:53.856Z"
}

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Get token transfers for an address

get

Retrieve the token transfer history for a specific address on a given blockchain

Path parameters

blockchainstring · enumRequiredPossible values:

tokenstring · enumRequiredPossible values:

addressstring · min: 1Required

Query parameters

limitinteger · min: 1 · max: 1000OptionalDefault: 10

fromTsintegerOptionalDefault: 0

toTsintegerOptional

Header parameters

x-api-keystringRequired

API Key for authentication

Responses

200

Default Response

application/json

400

Default Response

application/json

401

Default Response

application/json

500

Default Response

application/json

get

/api/v1/{blockchain}/{token}/{address}/token-transfers

HTTPcURLJavaScriptPython

GET /api/v1/{blockchain}/{token}/{address}/token-transfers HTTP/1.1
Host: wdk-api.tether.io
x-api-key: text
Accept: */*

{
  "transfers": [
    {
      "blockchain": "text",
      "blockNumber": 1,
      "transactionHash": "text",
      "transferIndex": 1,
      "token": "text",
      "amount": "text",
      "timestamp": 1,
      "transactionIndex": 1,
      "logIndex": 1,
      "from": "text",
      "to": "text",
      "label": "text",
      "ANY_ADDITIONAL_PROPERTY": "anything"
    }
  ]
}

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Get token balance for an address

get

Retrieve the current token balance for a specific address on a given blockchain

Path parameters

blockchainstring · enumRequiredPossible values:

tokenstring · enumRequiredPossible values:

addressstring · min: 1Required

Header parameters

x-api-keystringRequired

API Key for authentication

Responses

200

Default Response

application/json

400

Default Response

application/json

401

Default Response

application/json

500

Default Response

application/json

get

/api/v1/{blockchain}/{token}/{address}/token-balances

HTTPcURLJavaScriptPython

GET /api/v1/{blockchain}/{token}/{address}/token-balances HTTP/1.1
Host: wdk-api.tether.io
x-api-key: text
Accept: */*

{
  "tokenBalance": {
    "blockchain": "text",
    "token": "text",
    "amount": "text"
  }
}

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Error Handling

The API returns standard HTTP error codes:

Status Code	Description
400	Bad Request - Invalid parameters
401	Unauthorized - Invalid API key
404	Not Found - Resource not found
429	Too Many Requests - Rate limit exceeded
500	Internal Server Error

Error Response Format

Error Response

{
  "error": "error_type",
  "message": "Detailed error message"
}

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Next Steps

• Get Started - Quick start guide with setup instructions

• React Native Starter - See it in action

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