Create hosted forms from your software or AI agent.

Define a form through the Fangst API and receive a link. Share it with one person or many respondents. Every completed response returns as structured data.

Start free See the API example

From API call to structured result.

Create the requestSoftware or an AI agent defines the fields and receives a hosted URL.
Share the URLA person opens the Fangst page and provides the requested input or files.
Read the resultFangst returns structured data through the API or a signed webhook.

Create one form for many responses.

Use a reusable request for surveys, onboarding, applications, or any structured input your software needs.

Create

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

{
  "title": "Project information",
  "response_limit": 500,
  "fields": [
    {
      "key": "name",
      "type": "text",
      "required": true
    },
    {
      "key": "project_type",
      "type": "select",
      "options": [
        "New",
        "Existing"
      ]
    }
  ]
}

Completed result

{
  "status": "completed",
  "response": {
    "company_name": "Northstar AS"
  }
}

Use one forms API for reusable and one-off requests.

Fangst separates the form definition from each completed response. Your software can create a reusable form for many respondents or generate a request for one customer, case, or agent run.

Reusable forms

Set a response limit and share the same hosted URL for surveys, applications, or recurring intake.

Case-specific requests

Create a new form with private metadata when every response must map to a customer, order, or agent thread.

Structured delivery

Read typed responses through the API or continue automatically from a signed completion webhook.

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/requestsCreate a hosted request and receive its URL.

GET/v1/requests/:idRead request status and configuration.

GET/v1/requests/:id/submissionsRead completed responses.

MCPrequest_human_inputLet an authorized agent create the request.

MCPget_human_inputLet the agent read the completed response.

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.

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