# Saylor Innovations Data Desk: EVM Multichain Contract Deployment Checker

> Saylor Innovations Data Desk: EVM Multichain Contract Deployment Checker is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-27).

Checks which of 16 EVM chains a given contract address is deployed on, including bytecode hash comparison to distinguish true multichain deployments from look-alike contracts.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/chain/deployed-on?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-data-desk-evm-multichain-contract-deployment-checker-2e17e552
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dilyVYTVK2IQw6epb41Z7

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 saylor-innovations-data-desk-evm-multichain-contract-deployment-checker-2e17e552
```

Example prompt: Can you check which of the 16 EVM chains the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 is deployed on, and tell me if the bytecode is identical everywhere or if there are look-alikes?

## When to prefer this

Choose this endpoint when you need to verify whether a smart contract is genuinely deployed across multiple EVM networks or detect impostor contracts with different bytecode. It covers 16 chains in a single call, making it far more efficient than querying individual block explorers. Ideal for security audits, token verification, DeFi protocol research, and any scenario requiring bytecode-level authenticity checks across EVM ecosystems.

## Known failure modes

- Chain RPC timeout or unavailability causes that chain to return ok=false with no code data
- Invalid or non-checksummed address format may cause a query error
- An EOA address (non-contract) returns has_code=false on all chains
- Partial results if some chains fail to respond within the timeout window
- Address deployed on none of the 16 supported chains returns deployed_count of 0

## How this service works

Which of 16 EVM chains an address has contract code on, with a bytecode hash match to spot true multichain deployments versus look-alikes.

## Output

Returns a JSON object listing all 16 queried EVM chains with per-chain results including: whether contract code exists, the keccak256 bytecode hash prefix, code size in bytes, and EIP-7702 delegation status. Also includes summary fields: total chains queried, chains that answered, list of chains where contract is deployed, count of deployments, number of distinct bytecodes, whether bytecode is identical everywhere, elapsed time, and a plain-language note interpreting the findings.

## 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": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "the contract address to look for on every chain"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "address",
      "chains_queried",
      "deployed_on",
      "deployed_count",
      "identical_bytecode_everywhere",
      "results",
      "note",
      "source"
     ],
     "properties": {
      "note": {
       "type": "string",
       "description": "plain-language reading of the result"
      },
      "source": {
       "type": "string",
       "description": "where the data was read from or how it was computed"
      },
      "address": {
       "type": "string",
       "description": "the address queried"
      },
      "results": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "ok": {
          "type": [
           "boolean",
           "null"
          ],
          "description": "false when the chain did not answer"
         },
         "chain": {
          "type": [
           "string",
           "null"
          ],
          "description": "chain name"
         },
         "has_code": {
          "type": [
           "boolean",
           "null"
          ],
          "description": "true when contract code exists"
         },
         "code_hash": {
          "type": [
           "string",
           "null"
          ],
          "description": "start of the keccak256 of the code"
         },
         "code_size_bytes": {
          "type": [
           "number",
           "null"
          ],
          "description": "deployed code size"
         },
         "eip7702_delegated": {
          "type": [
           "boolean",
           "null"
          ],
          "description": "true for a
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-data-desk-evm-multichain-contract-deployment-checker-2e17e552/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)