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POST
https://api.0xarchive.io
/
v1
/
auth
/
web3
/
challenge
Get SIWE challenge message
curl --request POST \
  --url https://api.0xarchive.io/v1/auth/web3/challenge \
  --header 'Content-Type: application/json' \
  --data '
{
  "address": "0x742d35Cc6634C0532925a3b844Bc9e7595f2bD18"
}
'
{
  "message": "<string>",
  "nonce": "<string>"
}

Documentation Index

Fetch the complete documentation index at: https://docs.0xarchive.io/llms.txt

Use this file to discover all available pages before exploring further.

Body

application/json
​
address
string
required

Ethereum wallet address

Example:

"0x742d35Cc6634C0532925a3b844Bc9e7595f2bD18"

Response

SIWE challenge message

​
message
string

SIWE message to sign with personal_sign (EIP-191)

​
nonce
string

Single-use nonce (expires after 10 minutes)

Last modified on May 20, 2026