ETH Address

GET/v0/eth-address

Validates whether a string is a valid Ethereum address (40 hex characters with 0x prefix). When valid, the response includes the EIP-55 checksummed address and whether the original input passes the mixed-case checksum.

Guides: Node.js · Python

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Query Parameters

Parameter	Type	Required	Description
value	string	Yes	The Ethereum address to validate (with 0x prefix)

Example Request

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://api.isvalid.dev/v0/eth-address?value=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"

Response Fields

Field	Type	Description
valid	boolean	Whether the value is a valid Ethereum address
address	string	EIP-55 checksummed address
isChecksumValid	boolean	Whether the input passes EIP-55 mixed-case checksum verification. Always `true` for all-lowercase or all-uppercase input (no checksum to verify).

Example Response

{
  "valid": true,
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "isChecksumValid": true
}

Example Response — invalid

{
  "valid": false
}