Verify EVM signatures offline

Verify EVM signatures offline: EIP-191 personal messages, EIP-712 typed data, and x402/EIP-3009 payment authorizations (paste a raw Payment-Signature header) — recovers the signing wallet, checks it against an expected address, and reports the authorization's amount, payee and validity window. No chain reads.

Answeringour last check, 2026-09-24

1 of 1checks answered this week

574 msmedian answer time

$0.002listed price per call

$0.002price it asked us

Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.

Endpoint

POST https://workbot1.oddsys.org/verify-sig

Category	Market data
Provider host	workbot1.oddsys.org
Networks	eip155:8453
Payment schemes	exact
Self-reported calls, 30 days	1 from 1 payers (the provider's figure, not ours)

Our checks, last 30 days

Day	Result	HTTP	Asked	Time
2026-09-24	valid payment request	402	$0.002	574 ms

Example input (from the provider)

{
  "body": {
    "address": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
    "message": "Busker x402 verify-sig example",
    "signature": "0x8f83ce1348bb56eb6d7ede8f6c6787adc3897839e686a0b305fb87e7cd248d5555c7405f0e776b995be1971d6ed71a95541d19635e354f807d94c9326c22a1cb1c"
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
}

Promised output schema (from the provider)

{
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "additionalProperties": false,
          "description": "Exactly one of: message (EIP-191), typedData (EIP-712), authorization (EIP-3009 / x402 exact-EVM), paymentHeader (raw base64 Payment-Signature or X-Payment header). signature is required except with paymentHeader.",
          "properties": {
            "address": {
              "description": "Expected signer; when given the response carries a matches boolean.",
              "type": "string"
            },
            "authorization": {
              "description": "EIP-3009 TransferWithAuthorization fields { from, to, value, validAfter, validBefore, nonce } (the x402 payload.authorization object).",
              "type": "object"
            },
            "domain": {
              "description": "Explicit EIP-712 domain { name, version, chainId, verifyingContract } for a non-USDC token.",
              "type": "object"
            },
            "message": {
              "description": "Plain message that was signed with personal_sign (EIP-191).",
              "type": "string"
            },
            "network": {
              "description": "CAIP-2 network for authorization mode (default eip155:8453 = USDC on Base).",
              "type": "string"
            },
            "paymentHeader": {
              "description": "Raw base64 value of an x402 Payment-Signature / X-Payment header; decoded and verified in one step.",
              "type": "string"
            },
            "signature": {
              "description": "0x-prefixed 65-byte signature.",
              "type": "string"
            },
            "typedData": {
              "description": "EIP-712 payload { domain, types, primaryType, message } exactly as signed.",
              "type": "object"
            }
          },
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    }
  }
}

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