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Source OpenAPI: 0xArchive API 1.6.1; 147 paths; 128 component schemas. Get a single-use SIWE (Sign-In with Ethereum) challenge message for existing-wallet sign-in, wallet key management, or paid x402 access. The nonce expires after 10 minutes. A challenge does not create a Free account.

Route Metadata

Request Body

application/json

Response Contracts

Status 200

SIWE challenge message

application/json

Status 400

Invalid request

application/json

OpenAPI example

Status 429

Rate limit exceeded

application/json

OpenAPI example
Last modified on July 28, 2026