REST API Free Tier Multi-object detection

Object Detection API

Detect objects from images programmatically with a single API call. Built for developers who need accurate labels, confidence scores, and optional bounding boxes at scale.

Why Use This API

AI object detection

Advanced AI models trained on broad visual datasets. Accurately identifies common object categories from real-world scenes.

Confidence Scoring

Returns confidence values for each detection so you can filter low-certainty predictions in production pipelines.

Bounding Box Output

Optionally includes bounding box coordinates so you can draw overlays or crop detected objects.

Multi-object detection

Detect and identify multiple different objects within a single image. Perfect for analyzing complex designs.

Quick Start

Start identifying objects in under a minute. Here's how:

  1. Get your API keySign up free to receive your key
  2. Send a request — POST an image containing one or more objects to the endpoint
  3. Get the result — Receive identified objects as JSON with confidence scores
curl -X POST https://precisioncounter.com/api/v1/detect-objects \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "image=@sample.png"
import requests

response = requests.post(
    "https://precisioncounter.com/api/v1/detect-objects",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    files={"image": open("sample.png", "rb")}
)

data = response.json()
for object in data["objects"]:
    print(f"{object['name']} ({object['confidence']:.0%})")
const fs = require("fs");
const FormData = require("form-data");

const form = new FormData();
form.append("image", fs.createReadStream("sample.png"));

const response = await fetch(
  "https://precisioncounter.com/api/v1/detect-objects",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer YOUR_API_KEY",
      ...form.getHeaders()
    },
    body: form
  }
);

const data = await response.json();
data.objects.forEach(f => console.log(`${f.name} (${f.confidence})`));

API Reference

Base URL

https://precisioncounter.com/api/v1

Authentication

All requests require an API key passed in the Authorization header:

Authorization: Bearer YOUR_API_KEY

Detect Objects

POST /api/v1/detect-objects

Detects objects from an uploaded image and returns structured detection results as JSON.

Request Parameters

Parameter Type Description
image required file Image file to analyze for object detection. Accepted formats: PNG, JPG, JPEG, WebP. Max size: 10 MB.
max_objects optional integer Max number of object detections to return. Default: 5. Range: 1-20.
include_boxes optional boolean Include bounding box coordinates for each detection. Default: true.

Response

200 OK — Returns identified object data as JSON.

{
  "objects": [
    {
      "name": "person",
      "confidence": 0.94,
      "category": "human",
      "box": {
        "x": 124,
        "y": 52,
        "width": 300,
        "height": 540
      }
    }
  ],
  "image_width": 1280,
  "image_height": 720,
  "processing_time_ms": 450
}

Response Headers

Header Value
Content-Type application/json
X-Credits-Remaining Number of API credits remaining
X-Processing-Time Processing time in milliseconds

Code Examples

Full Examples (with error handling)

curl -X POST https://precisioncounter.com/api/v1/detect-objects \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "image=@sample.png" \
  -F "max_objects=5" \
  -F "include_boxes=true"
import requests
import sys

API_KEY = "YOUR_API_KEY"
API_URL = "https://precisioncounter.com/api/v1/detect-objects"

def detect_objects(input_path, max_objects=5):
    """Detect objects from an image file."""
    with open(input_path, "rb") as img:
        response = requests.post(
            API_URL,
            headers={"Authorization": f"Bearer {API_KEY}"},
            files={"image": img},
            data={"max_objects": max_objects, "include_boxes": "true"}
        )

    if response.status_code == 200:
        data = response.json()
        for object in data["objects"]:
            print(f"{object['name']} - {object['confidence']:.0%} confidence")
            print(f"  Category: {object['category']}")
            if object.get("box"):
              print(f"  Box: {object['box']}")
        print(f"Credits remaining: {response.headers.get('X-Credits-Remaining')}")
    else:
        print(f"Error {response.status_code}: {response.json()['error']}")

detect_objects("sample.png")
const fs = require("fs");
const FormData = require("form-data");
const fetch = require("node-fetch");

const API_KEY = "YOUR_API_KEY";
const API_URL = "https://precisioncounter.com/api/v1/detect-objects";

async function detectObjects(inputPath, maxResults = 5) {
  const form = new FormData();
  form.append("image", fs.createReadStream(inputPath));
  form.append("max_objects", String(maxResults));
  form.append("include_boxes", "true");

  const response = await fetch(API_URL, {
    method: "POST",
    headers: {
      "Authorization": `Bearer ${API_KEY}`,
      ...form.getHeaders()
    },
    body: form
  });

  if (response.ok) {
    const data = await response.json();
    data.objects.forEach(object => {
      console.log(`${object.name} - ${(object.confidence * 100).toFixed(0)}%`);
      console.log(`  Category: ${object.category}`);
      if (object.box) console.log(`  Box: ${JSON.stringify(object.box)}`);
    });
    console.log(`Credits: ${response.headers.get("x-credits-remaining")}`);
  } else {
    const error = await response.json();
    console.error(`Error ${response.status}: ${error.error}`);
  }
}

detectObjects("sample.png");
<?php
$api_key = "YOUR_API_KEY";
$url = "https://precisioncounter.com/api/v1/detect-objects";

$ch = curl_init();
curl_setopt_array($ch, [
    CURLOPT_URL => $url,
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        "Authorization: Bearer $api_key"
    ],
    CURLOPT_POSTFIELDS => [
        "image" => new CURLFile("sample.png"),
        "max_objects" => "5",
        "include_boxes" => "true"
    ]
]);

$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($httpCode === 200) {
    $data = json_decode($response, true);
    foreach ($data["objects"] as $object) {
        echo $object["name"] . " - " . ($object["confidence"] * 100) . "% confidence\n";
        echo "  Category: " . $object["category"] . "\n";
        if (isset($object["box"])) {
          echo "  Box: " . json_encode($object["box"]) . "\n";
        }
    }
} else {
    echo "Error $httpCode: $response\n";
}
?>
package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io"
    "mime/multipart"
    "net/http"
    "os"
)

type ObjectResult struct {
    Name       string   `json:"name"`
    Confidence float64  `json:"confidence"`
    Category   string   `json:"category"`
  Box        map[string]int `json:"box"`
}

type Response struct {
  Objects        []ObjectResult `json:"objects"`
  ImageWidth     int            `json:"image_width"`
  ImageHeight    int            `json:"image_height"`
  ProcessingTime int            `json:"processing_time_ms"`
}

func detectObjects(inputPath string) error {
    file, _ := os.Open(inputPath)
    defer file.Close()

    body := &bytes.Buffer{}
    writer := multipart.NewWriter(body)
    part, _ := writer.CreateFormFile("image", inputPath)
    io.Copy(part, file)
    writer.WriteField("max_objects", "5")
    writer.Close()

    req, _ := http.NewRequest("POST",
        "https://precisioncounter.com/api/v1/detect-objects", body)
    req.Header.Set("Authorization", "Bearer YOUR_API_KEY")
    req.Header.Set("Content-Type", writer.FormDataContentType())

    resp, err := http.DefaultClient.Do(req)
    if err != nil {
        return err
    }
    defer resp.Body.Close()

    if resp.StatusCode == 200 {
        var result Response
        json.NewDecoder(resp.Body).Decode(&result)
        for _, object := range result.Objects {
            fmt.Printf("%s - %.0f%% confidence\n", object.Name, object.Confidence*100)
        }
    }
    return nil
}

func main() {
    detectObjects("sample.png")
}
require "net/http"
require "uri"
require "json"

api_key = "YOUR_API_KEY"
uri = URI("https://precisioncounter.com/api/v1/detect-objects")

form_data = [
  ["image", File.open("sample.png", "rb")],
  ["max_objects", "5"],
  ["include_boxes", "true"]
]

req = Net::HTTP::Post.new(uri)
req["Authorization"] = "Bearer #{api_key}"
req.set_form(form_data, "multipart/form-data")

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(req)
end

if res.code == "200"
  data = JSON.parse(res.body)
  data["objects"].each do |object|
    puts "#{object['name']} - #{(object['confidence'] * 100).round}% confidence"
    puts "  Category: #{object['category']}"
    puts "  Box: #{object['box']}" if object['box']
  end
else
  puts "Error #{res.code}: #{res.body}"
end
using System.Text.Json;

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Bearer YOUR_API_KEY");

using var form = new MultipartFormDataContent();
var imageContent = new ByteArrayContent(File.ReadAllBytes("sample.png"));
imageContent.Headers.ContentType = new("image/png");
form.Add(imageContent, "image", "sample.png");
form.Add(new StringContent("5"), "max_objects");
form.Add(new StringContent("true"), "include_boxes");

var response = await client.PostAsync(
    "https://precisioncounter.com/api/v1/detect-objects", form);

if (response.IsSuccessStatusCode)
{
    var json = await response.Content.ReadAsStringAsync();
    var data = JsonSerializer.Deserialize<JsonElement>(json);
    foreach (var object in data.GetProperty("objects").EnumerateArray())
    {
        Console.WriteLine($"{object.GetProperty("name")} - {object.GetProperty("confidence")}");
    }
}

Error Handling

The API returns standard HTTP status codes with JSON error bodies:

Status Meaning Description
200 Success objects identified successfully. Response body contains JSON with object data.
400 Bad Request Missing image file, unsupported format, or file too large.
401 Unauthorized Missing or invalid API key.
429 Rate Limited Too many requests. Wait and retry with exponential backoff.
500 Server Error Internal processing error. Retry the request.

Error Response Format

{
  "error": "Invalid file format. Accepted: png, jpg, jpeg, webp",
  "code": "INVALID_FORMAT",
  "status": 400
}

Rate Limits

Plan Requests / Minute Max File Size Max Resolution
Free 10 10 MB 4096 x 4096 px
Pro 60 25 MB 8192 x 8192 px

Rate limit headers are included in every response:

X-RateLimit-Limit: 10
X-RateLimit-Remaining: 7
X-RateLimit-Reset: 1708646400

Use Cases

  • Design asset management
  • Brand consistency checking
  • Web scraping object detection
  • Accessibility compliance
  • Print production
  • image analysis research
  • Design tool plugins
  • detection workflow verification

Pricing

Free to Start

Get free API credits when you sign up. No credit card required.

Frequently Asked Questions

What image formats does the Object Detection API support?
The API accepts PNG, JPG, JPEG, and WebP images. Upload any image containing one or more objects, and the API will return structured detections.
Is the Object Detection API free?
Yes. You get free API calls to try the service when you sign up. No credit card is required to get started.
How accurate is the object identification?
The API uses modern vision models trained across many categories. Accuracy depends on image quality, lighting, and occlusion, and is strongest on clear images with distinct subjects.
Can the API detect multiple objects in one image?
Yes. The API can detect and identify multiple different objects within a single image. Use the max_objects parameter to control how many object detections are returned, up to 20 per request.
Does the API return bounding boxes?
Yes. By default, the API includes bounding box coordinates for each detected object. You can disable this with the include_boxes parameter set to false.
What information does the API return for each object?
For each detected object, the API returns a label, confidence score (0-1), category, and optional bounding box coordinates, plus processing metadata.
Does the API store my images?
No. Images are processed in memory and immediately discarded after the response is sent. We do not store, log, or share any uploaded images.