Create transactions

Composes a Safe transaction on the MPC ring and answers its EIP-712 hash together with the owner approval the ring's threshold signature produced.

POST /v1/wallet/{id}/transactions

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Address	`https://api.hanzo.ai/v1/wallet/{id}/transactions`
Method	`POST`
Operation	`post_wallet_by_id_transactions`
Auth	`Authorization: Bearer $HANZO_API_KEY`

Composes a Safe transaction on the MPC ring and answers its EIP-712 hash together with the owner approval the ring's threshold signature produced. Only a wallet whose custody is "safe" can do this — any other custody is a 400, because the backend itself is asked whether it can propose rather than the kind being switched on. The ring computes the Safe-tx hash bound to the Safe contract and the chain id, so the hash a caller gets back is the one the Safe will verify. This PROPOSES: it does not execute the transaction.

Request

6 fields, body application/json (required).

Field	In	Type	Required	Description
`id`	path	string	yes
`chainId`	body	integer (int64)	—	ChainID is the EVM chain the Safe transaction is bound to.
`data`	body	string	—	Data is the call data, hex-encoded.
`nonce`	body	integer (int64)	—	Nonce is the Safe's transaction nonce.
`to`	body	string	—	To is the transaction's target address.
`value`	body	string	—	Value is the native-token amount to send, as a decimal string in wei.

Response

Status	Body	Meaning
`200`	wallet.safeProposal	ok
`default`	problem-details	refused

200 body — 5 fields.

Field	In	Type	Always	Description
`r`	body	string	—	R is the r component of the MPC threshold signature over the Safe-tx hash.
`s`	body	string	—	S is the s component of that signature.
`safeAddress`	body	string	—	SafeAddress is the Safe contract this transaction is for.
`safeTxHash`	body	string	—	SafeTxHash is the EIP-712 Safe transaction hash, bound to the Safe contract and the chain id — the value the owner approval signs.
`walletId`	body	string	—	WalletID is the wallet whose Safe this is.

Failure carries the platform error shape — see Errors.

Examples

CLI

SDK

HTTP

MCP

hanzo wallet transactions <id>

.ts

.py

.go

.rs

.java

import { Configuration, WalletApi } from 'hanzoai';

const api = new WalletApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postWalletByIdTransactions({ id: 'id', chainId: 0, data: "<data>" });

from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import WalletApi

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = WalletApi(client).post_wallet_by_id_transactions(id='id', chain_id=0, data="<data>")

cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.WalletAPI.PostWalletByIdTransactions(context.Background()).Execute()
if err != nil {
	return err
}

use hanzo_client::apis::{configuration::Configuration, wallet_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = wallet_api::post_wallet_by_id_transactions(&cfg, Default::default()).await?;

import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.WalletApi;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new WalletApi(client).postWalletByIdTransactions();

curl -X POST https://api.hanzo.ai/v1/wallet/<id>/transactions \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "chainId": 0,
       "data": "<data>"
     }'

MCP reaches wallet through the wallet tool, which names its 7 operations with its own verbs — this one among them, under a name only MCP declares. describe explains any of them:

curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "describe",
         "arguments": {
           "op": "list_wallets"
         }
       }
     }'

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