Record an investment into a round

POST /v1/captable/rounds/{id}/investments

Records what a stakeholder put into a round and adds it to the round's raised total.

On a PRICED round this ISSUES SHARES as well as recording the money: the amount is divided by the round's price per share, rounded DOWN to whole shares, and a new certificate for them is issued to the investor in the round's share class — so an amount too small to buy one whole share is refused rather than recorded as a zero-share investment. On a non-priced round the money is recorded and no shares are issued.

The round must exist in this company and still be OPEN — a closed round refuses further investment — and the investor must already be a stakeholder here. The date defaults to today when omitted.

Writes the caller's OWN cap table: the org resolved from the validated principal selects the tenant's store and scopes every row, so there is no field by which a caller can write into another company's table; a request with no validated org is refused. The whole write runs in one transaction, so a refusal leaves nothing behind. Validation is the cap-table bundle's and so is its refusal: a bad body comes back as {success:false, message, errors:[…]} with the failing fields listed, and numeric fields accept a number OR a numeric string. Bodies are capped at 1 MiB.

Request

1 field.

Response

The document declares no response body for this operation. It answers 200 on success and the platform error shape on failure — see Errors.

Examples

hanzo captable rounds investments <id>

import { Configuration, CaptableApi } from 'hanzoai';

const api = new CaptableApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postCaptableRoundsByIdInvestments({ id: 'id' });

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

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = CaptableApi(client).post_captable_rounds_by_id_investments(id='id')

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

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

use hanzo_cloud::apis::{configuration::Configuration, captable_api};

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

let result = captable_api::post_captable_rounds_by_id_investments(&cfg, Default::default()).await?;

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

ApiClient client = new ApiClient();
client.setRequestInterceptor(b -> b.header("Authorization", "Bearer " + System.getenv("HANZO_API_KEY")));

var result = new CaptableApi(client).postCaptableRoundsByIdInvestments();

curl -X POST https://api.hanzo.ai/v1/captable/rounds/<id>/investments \
  -H "Authorization: Bearer $HANZO_API_KEY"

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_captable_classes"
         }
       }
     }'

Captable API · All Hanzo APIs · Interactive reference