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x402-gateway: wallet_verify_siwe
x402
x402-gateway: wallet_verify_siwe is a paid API for AI agents from x402.freeq.one, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Verify a Sign-In-With-Ethereum (EIP-4361) SIWE signature, returning the recovered wallet address and chainId without creating sessions or consuming nonces.
Price / call$0.002
Success—
StatusUnknown
How this service works
SIWE Signature Verifier: Verify a Sign-In-With-Ethereum (EIP-4361) signature. Stateless oracle: checks the signature against the message and returns the wallet address + chainId. Never mints sessions or consumes nonces. Get a checksummed address first via wallet_checksum. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_siwe.
Output
Returns the EIP-55 checksummed Ethereum wallet address that produced the signature, along with the chainId extracted from the SIWE message. The check is purely cryptographic and stateless — no session is created, no nonce is consumed, and the result is deterministic given the same inputs.
Example use cases
Wallet login verification for dApp
“A user just signed a SIWE challenge on my dApp — here's the EIP-4361 message and the signature they returned. Can you verify the signature and tell me which Ethereum address signed it and what chainId?”
Stateless signature audit trail
“I have a batch of SIWE signatures collected from users last week. Can you verify this one signature — here's the message and signature — and confirm the recovered wallet address matches what we stored, without touching any session state?”
Cross-chain identity check
“Before letting this wallet interact with our protocol, I need to verify their SIWE signature. Here's the full EIP-4361 message and the hex signature — please recover the signer's checksummed address and tell me which chain they signed on.”
Technical details
Endpoint
POSThttps://x402.freeq.one/tools/wallet_verify_siwe?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need stateless, cryptographic verification of a Sign-In-With-Ethereum (EIP-4361) signature without any server-side session management or nonce tracking. It is ideal for agents that need to confirm wallet ownership as part of an authentication flow, audit past signatures, or verify identity claims in a trustless manner. Prefer it over full auth servers when you want a pure oracle that simply recovers the signer address without side effects.
Side effects
- Invalid or malformed SIWE message format — returns error indicating EIP-4361 parse failure
- Signature does not match the message — returns error with mismatch indication
- Unsupported chainId or network — may return validation error
- Malformed hex signature string — returns parse or decoding error
- Missing required body fields — returns schema validation error
- Payment not provided or insufficient — returns HTTP 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| message | string | EIP-4361 SIWE message (line 2 must be a checksummed address) |
| signature | string | 0x-prefixed personal_sign signature over the exact message bytes |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {}
}
}Tags
x402
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