# Web3 Tools – Transaction Hash / TXID / Signature Format Checker

> Web3 Tools – Transaction Hash / TXID / Signature Format Checker is a paid API for AI agents from web3-tools.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Validates whether a given string is a well-formed transaction identifier (EVM hash, Bitcoin txid, or Solana signature) and flags any formatting typos or errors.

## Facts

- Endpoint: GET https://web3-tools.x402tookit.com/tx-hash-check?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/web3-tools-transaction-hash-txid-signature-format-checker-bee7b105
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KRGwL8omH2oGxlwzX1aPh

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability web3-tools-transaction-hash-txid-signature-format-checker-bee7b105
```

Example prompt: Can you check whether this string is a valid transaction ID and tell me which blockchain it belongs to, or if there's a typo: 0x4e3a8f2d1b9c6e5f7a0d3c2b1a9e8f7d6c5b4a3e2d1c0b9a8f7e6d5c4b3a2e1d0?

## When to prefer this

Use this endpoint when you need to quickly classify and validate a raw transaction identifier string by format alone — without actually querying a blockchain node or explorer. Ideal for pre-flight checks before submitting to an explorer API, validating user-supplied txids in forms or support tickets, or detecting copy-paste typos across EVM, Bitcoin, and Solana transaction formats in a single call.

## Known failure modes

- Input string is entirely unrecognisable (returns a non-matching verdict with reasons)
- Ambiguous or truncated hash may not map cleanly to a family
- Service degraded flag may be set if internal checks are partially unavailable
- Missing required 'id' query parameter returns an error

## How this service works

Recognise what a transaction id looks like (EVM hash, Bitcoin txid, Solana signature) from format alone, and flag typos.

## Output

Returns a verdict on whether the input is a valid transaction identifier, the detected blockchain family (EVM, Bitcoin, Solana), a normalised form of the hash, a plain-language summary, a list of reasons if invalid, and metadata such as whether the service was degraded and a disclaimer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "id"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "A transaction hash, txid or signature"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "input": {
       "type": [
        "null",
        "string"
       ]
      },
      "family": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "normalised": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/web3-tools-transaction-hash-txid-signature-format-checker-bee7b105/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from web3-tools.x402tookit.com](https://www.zero.xyz/host/web3-tools.x402tookit.com/llms.txt)