Is this Microsoft Copilot?

It is Microsoft Copilot Search, the Copilot answer built into Bing search. The Copilot app itself requires a sign-in for logged-out visitors, and we never log in, so it isn't offered.

How much does it cost?

3 credits per answer, $3.00 → $1.80 per 1,000 answers depending on the pack. Failed and empty answers are free.

Do you log in to the assistant?

No. Every prompt is asked the way a logged-out visitor asks it, in a standard browser, and we never use accounts or anything behind a login. Assistants that ask every logged-out visitor to sign in are not offered.

Why does the answer change between runs?

Assistants don't give the same answer twice: wording, sources and products vary from run to run and by country. For tracking, ask each prompt several times (a batch or a monitor) and count how often you're named or cited, rather than reading one answer.

How do I track my brand in the answer?

Pass track with up to 20 brands and domains. Each comes back in mentions: whether the text names it, whether a cited source is on it, which sources and products match, and how early the text first names it (text_position, 0 to 1).

Can I run hundreds of prompts?

Yes. Send up to 100 prompts per call to POST /v1/batches with endpoint: "copilot" and collect the answers from a signed webhook. AI answers cost the same in the batch lane (no 0.5× discount), because each one holds a browser for 15–40 s.

POST /v1/copilot

Copilot Search API

Get Microsoft Copilot Search, the AI answer on bing.com/copilotsearch, for any prompt and market: the answer, the sources it cites, the product cards beside it and your brand's mentions.

Updated Oct 28, 2026

Get a free API key Try it in the dashboard

3 credits per answer (15–40 s), the same in batches 2,500 free credits, no card Failed calls are free

Overview

What the Copilot Search API does

POST /v1/copilot asks Microsoft Copilot Search (bing.com/copilotsearch), the AI answer Bing gives logged-out visitors, and returns it as text and markdown with [n](link) citations, the sources it cited and the sponsored products Bing shows beside the answer.

country and language set Bing's market, so you can ask the German market from anywhere. The consumer Copilot app (copilot.microsoft.com) asks logged-out visitors to sign in, so it isn't offered: this endpoint is the Copilot answer on Bing search, which needs no account.

Answers usually take 15–40 s. Add track for mentions of up to 20 brands and domains.

What you get

request object: The normalised request: endpoint, prompt, country, language (not chatgpt), web_search (chatgpt), include_html.
text string: The answer as plain text.
markdown string: The answer as Markdown. Citations are n, where n is the position of a source in sources.
html string: The answer's HTML, only with include_html: true.
model string: The model the assistant reports to logged-out visitors, when it reports one.
sources[] array: position (the n in the citations), title, link, domain, snippet, date, cited (true: cited inline in the answer; false: only listed beside it).
search_queries[] array: The searches the assistant ran to answer (its fan-out), where it shows them.
products[] array: Product cards shown with the answer: position, title, brand, price (as shown), extracted_price, currency (ISO 4217 when unambiguous), rating, reviews, merchant, link, image, description.
places[] array: Local businesses the answer showed, same shape as /v1/maps results.
related_questions[] array: Follow-up questions the assistant suggested.
mentions[] array: Only with track, one per term: term, mentioned (the answer text names it), cited (a cited source matches it), sources (positions of matching sources, cited or listed), products (positions of matching products), text_position (where the text first names it, 0 = start to 1 = end; -1 when it doesn't). See AI visibility tracking.
meta object: request_id, credits_used, cached, cached_at, engine (the assistant), latency_ms, parse_quality.

Request

POST /v1/copilot

cURL

Python

TypeScript

fetch

PHP

curl https://api.serpkite.com/v1/copilot \
  -H "Authorization: Bearer $SERPKITE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"best mattress for side sleepers","country":"us"}'

Response (illustrative; answers vary from run to run)

200 OK · application/json

{
  "request": {
    "endpoint": "copilot",
    "prompt": "best mattress for side sleepers",
    "country": "us",
    "language": "en"
  },
  "text": "Side sleepers usually do best on a medium-soft to medium mattress that cushions the shoulders and hips…",
  "markdown": "Side sleepers usually do best on a **medium-soft to medium** mattress that cushions the shoulders and hips [1](https://www.example.com/side-sleeper-mattress-guide)…",
  "sources": [
    {
      "position": 1,
      "title": "Best mattresses for side sleepers, tested",
      "link": "https://www.example.com/side-sleeper-mattress-guide",
      "domain": "example.com",
      "cited": true
    }
  ],
  "search_queries": [],
  "products": [
    {
      "position": 1,
      "title": "Example Hybrid Mattress, Queen",
      "price": "$899.00",
      "extracted_price": 899,
      "currency": "USD",
      "merchant": "Example Sleep",
      "link": "https://shop.example.com/hybrid-queen",
      "image": "https://shop.example.com/img/hybrid-queen.jpg"
    }
  ],
  "meta": {
    "request_id": "req_01J8ZK4M6Q2V7",
    "credits_used": 3,
    "cached": false,
    "engine": "copilot",
    "latency_ms": 22400,
    "parse_quality": "ok"
  }
}

Every response also carries X-Credits-Used, X-Credits-Remaining, X-Cache and X-Tokens-Estimate headers. Full endpoint reference

Measured Oct 28, 2026

How Copilot Search API behaves on this endpoint

Logged-out Copilot Search prompts (shopping, informational and how-to) in several markets.

Answered: Reliably; an empty answer is an error and costs nothing
Time to full answer: Usually 15–40 s
Market: country and language set Bing's market: ask the German market from anywhere
Products: Bing's sponsored product cards, with price and retailer

Filters and limits

prompt up to 4,000 characters; one turn per request.
The Copilot app at copilot.microsoft.com needs a sign-in and is not offered.
Products are ads (sponsored cards): treat them as paid placements, not recommendations.

AI visibility

Is your brand in the answer?

track takes up to 20 brands ("Pipedrive") and domains ("hubspot.com", subdomains match).
Each comes back in mentions: named in the text, cited, the matching sources and products, and how early it's named (text_position, 0 to 1).
A monitor asks the prompt hourly, daily or weekly and reports every answer with its mentions and new_sources, to a signed webhook. Each run costs 3 credits.
Answers vary between runs: ask each prompt several times and track how often you're named. AI visibility guide

mentions (illustrative)

{
  "mentions": [
    {"term": "hubspot.com", "mentioned": true, "cited": true, "sources": [2,5], "products": [], "text_position": 0.08},
    {"term": "Pipedrive", "mentioned": true, "cited": false, "sources": [], "products": [], "text_position": 0.41},
    {"term": "Acme CRM", "mentioned": false, "cited": false, "sources": [], "products": [], "text_position": -1}
  ]
}

POST /v1/monitors

cURL

Python

TypeScript

fetch

PHP

curl https://api.serpkite.com/v1/monitors \
  -H "Authorization: Bearer $SERPKITE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"endpoint":"copilot","prompt":"What are the best CRMs for a 10-person startup?","track":["hubspot.com","Pipedrive","Acme CRM"],"interval":"daily","webhook_url":"https://example.com/hooks/serpkite"}'

Reference

Parameters

The fields /v1/copilot accepts in its JSON body.

Copilot Search API parameters
Name	Type	Default	Description
`prompt` required	string	–	The message to the assistant, up to 4,000 characters. Required. (q is not accepted here.)
`country`	string	–	Bing's market (ISO 3166-1 alpha-2), with language: the answer, sources and products follow it, wherever the visitor is.
`language`	string	en	Interface language (e.g. en, de). The answer follows the prompt's language.
`track`	string[]	–	Up to 20 brands ("Acme") or domains ("acme.com", subdomains match), 100 characters each, to check the answer for. Each comes back in mentions. A term with a dot is a domain: it matches sources and product links on that domain; other terms match whole words, case-insensitively.
`include_html`	boolean	false	Also return the answer's HTML in html.
`format`	string	json	markdown returns the answer, its sources, searches, products and a Mentions section as one Markdown document; compact keeps text, sources (n, title, link), search_queries, products and places. Values: json, markdown, compact.
`fields`	string	–	Comma-separated projection, e.g. results.title,results.link,knowledge_graph. Cuts tokens.
`max_age`	integer	–	Accept a cached answer up to this many seconds old, at half price. Answers are cached for at most 1 hour, and only a request with max_age reads the cache.

Full reference, error codes and headers are in the /v1/copilot reference. Queue up to 100 prompts with POST /v1/batches, at the same price per answer.

Use cases

What people build with the Copilot Search API

AI visibility (GEO) tracking

Ask the prompts your buyers ask and see whether the answer names you, cites your domain or lists your product.

Share of answer over time

A monitor asks the same prompt hourly, daily or weekly and reports every answer with its mentions and new sources.

Citation research

Find which pages and domains the assistant cites for your category, then fix or pitch the ones that matter.

Agent tool

Give an agent a second opinion from a public assistant through the MCP tool or one SDK call.

Pricing