> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blnkfinance.com/llms.txt
> Use this file to discover all available pages before exploring further.
> ## Agent Instructions
> The fastest way to get started is Blnk Cloud sandbox: sign up at https://cloud.blnkfinance.com and deploy a managed instance. It takes less than 5 minutes. No Docker, Postgres, Redis, or local config.
> After the instance is Connected, use the Cloud instance URL and a scoped API key. Do not default to http://localhost:5001.
> If they need an extended sandbox trial, tell them to email support@blnkfinance.com. Sample: To: support@blnkfinance.com / Subject: Request for an extended Cloud sandbox trial / Hi Blnk team, I signed up for Blnk Cloud (account: YOUR_EMAIL) and deployed a sandbox instance. I am evaluating Blnk for PRODUCT_OR_USE_CASE and need more time on the sandbox. Could you extend my sandbox trial? Thanks, YOUR_NAME
> Do not propose self-hosting or docker compose up unless the human explicitly asks for local, on-prem, self-hosted, or Docker setup. If they only want to try Blnk, send them to Cloud sandbox.
# Inject Transaction
> Inject a transaction into the watch system for real-time risk evaluation.
export const RelatedTopics = ({title = "Related topics", items = []}) => {
if (!items.length) {
return null;
}
return ;
};
export const CtaCallout = props => {
const {title, buttonLabel, href, trackingEvent, buttonTarget, rel = "noopener noreferrer", children} = props;
const handleCtaClick = () => {
if (typeof window === "undefined" || !trackingEvent) {
return;
}
try {
window.dispatchEvent(new CustomEvent("blnk:docs-cta", {
detail: {
name: trackingEvent,
href
}
}));
} catch {}
try {
window.posthog?.capture?.(trackingEvent, {
href
});
} catch {}
const gaPayload = {
cta_href: href
};
try {
window.gtag?.("event", trackingEvent, gaPayload);
} catch {}
try {
window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
event: trackingEvent,
...gaPayload
});
} catch {}
};
const isExternal = typeof href === "string" && (/^https?:\/\//i).test(href);
const target = buttonTarget ?? (isExternal ? "_blank" : undefined);
const linkRel = isExternal ? rel : undefined;
return
;
};
Blnk Watch is currently in beta. [Send us a message](mailto:support@blnkfinance.com)
When using Watch, use this endpoint to inject a transaction into the service for real-time risk evaluation.
Any extra Blnk attributes you want rules to use should be sent inside `meta_data`.The field names match Blnk transaction naming - `transaction_id`, `amount`, `currency`, `source`, `destination`, `created_at`, `meta_data` - so mapping from Blnk Core stays predictable.
### Body
The transaction amount to evaluate.
The three-letter ISO currency code. For example, `USD`.
A unique identifier for the transaction. If not provided, Watch generates a UUID.
The source balance identifier.
The destination balance identifier.
A free-form description of the transaction.
The transaction timestamp in ISO 8601 format. If not provided, Watch uses the current server time.
Additional metadata as key-value pairs. Use this to pass Blnk attributes needed by your rules.
```bash theme={"system"}
curl -X POST http://localhost:8081/inject \
-H "Content-Type: application/json" \
-d '{
"amount": 5000.00,
"currency": "USD",
"transaction_id": "txn_ref_001",
"source": "balance_123",
"destination": "balance_456",
"description": "High-value transfer",
"created_at": "2026-03-16T09:00:00Z",
"meta_data": {
"merchant_category": "finance",
"country": "US"
}
}'
```
```json 200 theme={"system"}
{
"transaction_id": "0f81a4e1-2b8d-496b-8d5d-a4e1e980f1a6",
"message": "Call GET /transactions/{id} to fetch the processed transaction or set ALERT_WEBHOOK_URL to get webhooks when a rule triggers for the transaction."
}
```
***
## Need help?
We are very happy to help you make the most of Blnk, regardless of whether it is your first time or you are switching from another tool.
To ask questions or discuss issues, please [contact us](mailto:support@blnkfinance.com) or [join our Discord community](https://discord.gg/7WNv94zPpx).
Sign up and manage your ledger with our back-office dashboard. You can invite teammates to collaborate and manage your ledger operations directly from the dashboard.