EVM Message Signature Verifier

x402

EVM Message Signature Verifier is a paid API for AI agents from x402-toolbox.swiftbotlab.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).

Verifies an Ethereum message signature and recovers the signer address, confirming whether it matches a given EVM address

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

62 small, deterministic utility APIs (DNS and e-mail checks, web extraction, EVM decoding, x402 checks, IP math, JSON/CSV, hashing, conversions). No account or API key: pay per call in USDC with x402.

Output

Returns a JSON object with an 'ok' boolean, the tool name, and a 'result' object containing: 'matches' (true/false — whether the recovered address equals the provided address), 'recovered' (the 0x Ethereum address recovered from the signature), and 'messageHash' (the keccak256 hash of the prefixed message).

Example use cases

Wallet-based login verification

“A user just tried to log in by signing the message 'Login to MyApp at 2024-01-15T10:00:00Z' — can you verify that address 0x1234567890abcdef1234567890abcdef12345678 produced signature 0xabc...def and the recovered address matches?”

Smart contract authorization check

“Before I process this on-chain action, verify that the message 'Authorize transfer of 500 USDC' was signed by 0xDeadBeef00000000000000000000000000000000 using signature 0x9f3a...b2c1 — I need to confirm the signer matches before proceeding.”

NFT ownership claim validation

“Someone claims to own this NFT and proved it by signing the challenge 'Prove ownership of token #42 at block 18000000' as a hex-encoded message — check if address 0xaAbBcC1122334455667788990011aAbBcCdDeEfF signed that hex message with signature 0x77fa...3d09, using hex message encoding.”

Technical details

Endpoint

POSThttps://x402-toolbox.swiftbotlab.workers.dev/v1/evm/verify-message?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a lightweight, pay-per-call EVM signature verification without setting up an RPC node or Web3 library. Ideal for agents that occasionally verify Ethereum personal_sign signatures (EIP-191) without committing to a full blockchain SDK or subscription API key. At $0.003 per call it's cost-effective for sporadic verification tasks, and it returns the recovered address directly — useful for both authentication flows and forensic signer recovery.

Side effects

Invalid signature format (not 0x + 130 hex chars) — returns error or ok:false
Address mismatch — returns matches:false with the actual recovered address
Malformed address (not 42 chars) — validation error
Message encoding mismatch (hex specified but invalid hex string) — parse error
Payment failure or insufficient USDC balance — HTTP 402 response before processing

Input

Schema · Request body

Field	Type	Description
address	string
message	string
signature	string
messageEncoding	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "tool": "evm-verify-message",
    "result": {
      "matches": true,
      "recovered": "0x...",
      "messageHash": "0x50b2c43fd39106bafbba0da34fc430e1f91e3c96ea2acee2bc34119f92b37750"
    }
  }
}

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