◆Gaming

Steam Marketplace Signal Monitor Setup Guide

Time: 10 minutes | Difficulty: Moderate | Market: Gaming Mode: Signal-only | API: Steam Web API (read-only market data) | Docs: steamcommunity.com/dev

This guide configures a Steam Marketplace signal monitor using the botwir3 runtime. Connect to the Steam Web API for inventory and market data, generate pricing signals locally, and review them before acting manually.

Signal-only mode

Steam's Community Market API provides read-only access to inventory and pricing data. Automated purchasing on the Steam Marketplace is restricted by the Steam Subscriber Agreement. This guide configures the botwir3 runtime in signal-only mode: the bot monitors market data and generates signals. The user reviews the signals and executes manually on Steam.

botwir3 does not place orders, bids, or transactions on the Steam Marketplace. The user is responsible for all execution decisions.

ℹ Third-party markets. For automated trading of CS2 skins on third-party markets (Skinport, DMarket), see the CS2 Third-Party Markets Setup Guide. Those platforms have their own APIs and terms.

Before you start

Verify that data access is permitted under Steam's current terms of service before deploying. botwir3 provides tools for building structured automation. The user is responsible for compliance with the platform's terms and all applicable regulations.

Steam Subscriber Agreement | Last verified: May 2026

What you need

  • A Steam account
  • A Steam Web API key (free, from the developer portal)
  • The botwir3 runtime downloaded and unzipped
  • A strategy config file from the builder (signal-only mode)

Step 1: Configure the data source

  1. Navigate to steamcommunity.com/dev/apikey
  2. Register for a Steam Web API key (free, requires a Steam account with at least one purchase)
  3. Copy the API key

Create adapter.json in the bot directory:

{
  "adapter": "steam",
  "mode": "signal_only",
  "data_source": {
    "type": "api",
    "api_key": "paste-steam-web-api-key-here",
    "app_id": "730",
    "market_hash_name": "AK-47 | Redline (Field-Tested)"
  },
  "rate_limit_ms": 30000
}

app_id: "730" for CS2. Other games have different app IDs.

market_hash_name: The exact item name as it appears on the Steam Community Market. Case-sensitive.

API keys are stored in a local config file on the machine running the bot. They are not transmitted to botwir3 or any third party. botwir3 never sees, stores, or has access to platform credentials.

Step 2: Configure signal output

{
  "signal_output": {
    "type": "file",
    "path": "./signals/steam.json"
  }
}

Step 3: Start the monitor

botwir3 start --config my-strategy.json --signal-only

Expected output:

[botwir3] Adapter: steam
[botwir3] Mode: signal-only
[botwir3] Data source: Steam Web API (CS2, AK-47 | Redline)
[botwir3] Polling interval: 30s
[botwir3] Monitoring...

The runtime evaluates signals against the strategy and logs opportunities. It does not connect to the Steam Marketplace for order execution. The gate function compares proposed signals against the configured spec. All signals are recorded in the local ledger.

Reading the signals

[botwir3] Signal: BELOW_THRESHOLD | AK-47 | Redline (FT) | Listed: $12.40 | Threshold: $14.00
[botwir3] Signal logged to ./signals/steam.json

The user reviews each signal and decides whether to purchase manually on the Steam Community Market.

Why signal-only?

The Steam Web API provides inventory data, market prices, and item metadata — all read-only. Automated purchasing on the Steam Community Market is restricted by the Steam Subscriber Agreement. Steam uses trade holds, two-factor authentication, and rate limiting to further restrict automated transactions. Third-party CS2 markets (Skinport, DMarket) have separate APIs that support automated trading — see the CS2 Markets guide.

Related guides

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