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POST
/
auth
/
challenge
Create SIWE challenge
curl --request POST \
  --url https://api.portal.blend.money/sdk/auth/challenge \
  --header 'Content-Type: application/json' \
  --header 'X-Publishable-Key: <api-key>' \
  --data '
{
  "address": "0x1111111111111111111111111111111111111111"
}
'
{
  "status": "success",
  "data": {
    "message": "<string>",
    "nonce": "<string>"
  }
}

Documentation Index

Fetch the complete documentation index at: https://docs.blend.money/llms.txt

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

Authorizations

​
X-Publishable-Key
string
header
required

Client-safe Account Type key, for example pk_live_....

Body

application/json
​
address
string
required
Pattern: ^0x[0-9a-fA-F]{40}$
Example:

"0x1111111111111111111111111111111111111111"

​
chainId
integer
Required range: x >= 1
Example:

8453

Response

SIWE message created

​
status
enum<string>
required
Available options:
success
​
data
object
Last modified on May 4, 2026