Send structured data to a person for review.

Your software or AI agent supplies the current values and marks what can be edited. Fangst hosts the review page. The person corrects or confirms the result.

Contact See the API example

From API call to structured result.

Send the proposed dataSoftware or an AI agent creates a review with values already filled in.
Let a person check itThe reviewer confirms correct fields and changes anything that is wrong.
Read the corrected resultFangst returns the reviewed structure through the API or a webhook.

Turn almost-correct output into reviewed data.

Pre-fill extracted fields and highlight low-confidence values so the reviewer focuses on the information that needs attention.

Create

POST https://api.fang.st/v1/reviews
Authorization: Bearer <FANGST_API_TOKEN>
Content-Type: application/json

{
  "title": "Review extracted invoice",
  "initial_values": {
    "invoice_total": 1245,
    "currency": "NOK"
  },
  "editable_fields": [
    "invoice_total",
    "currency"
  ],
  "confidence": {
    "invoice_total": 0.62
  }
}

Completed result

{
  "status": "completed",
  "corrected": {
    "invoice_total": 12450,
    "currency": "NOK"
  }
}

Use REST, MCP, polling, or webhooks.

Software uses the HTTP resources directly. Authorized AI agents can use the same API or intention-oriented Fangst MCP tools.

POST/v1/reviewsCreate a hosted review with initial values.

GET/v1/reviews/:idRead corrected values and review status.

MCPrequest_human_reviewAsk a person to check generated or extracted data.

MCPget_human_reviewRead the confirmed or corrected result.

Fangst runs the hosted interaction.

Hosted page

Responsive pages, clear sender context, validation, private or shared links, expiry, and submission limits.

Structured result

Typed values, authenticated file downloads, correlation metadata, timestamps, and stable response ids.

Reliable delivery

Polling, signed webhooks, retries with backoff, delivery history, idempotency, and replay.

Pay for completed interactions. No subscription.

Start with $1 free. Add funds from $10. Links, polling, webhooks, and abandoned requests do not use the main billable unit.

See pricing

Give your software a way to ask people.

Create the hosted interaction through Fangst and receive the structured result back.

Contact