| Time | Status | User Agent |  |
| :-- | :-- | :-- | :-- |
| Make a request to see history. |

#### URL Expired

The URL for this request expired after 30 days.

### Supported Protocols & Networks

| Protocol | Network | Path Parameter |
| --- | --- | --- |
| Polkadot | Mainnet | `polkadot-mainnet` |
| Westend | `polkadot-westend` |
| Assethub Mainnet | `polkadot-assethub-mainnet` |
| Assethub Westend | `polkadot-assethub-westend` |

blockchain_id

string

required

Defaults to ethereum-mainnet

Either a hyphen seperated protocol-network pair like `ethereum-mainnet` or the `chain-id`

Api Tx Derive Signing Payload Request Substrate

# ``200      A signing payload

# ``400      Bad request

# ``401      Invalid or expired token

# ``429      Rate limit exceeded

# ``500      An internal server error happened

# ``501      The request endpoint is not implemented

# ``503      The resource you are trying to access is currently unavailable

ShellNodeRubyPHPPython

```

xxxxxxxxxx

curl --request POST \

--url https://svc.blockdaemon.com/tx/v1/ethereum-mainnet/derive_signing_payload \

--header 'X-API-Key: ••••' \

--header 'accept: application/json' \

--header 'content-type: application/json'
```