If you are building a Discord bot, website or app for Murder Mystery 2 (MM2) trading, you need item values from somewhere. This page answers the common questions about free MM2 value APIs and explains what to check before you pick one.
Short answer:
- Yes, there is a free MM2 value API: RBLXValue API v2 (
https://api.rblxvalue.com/v2), 30 requests/minute on the free plan.- It returns values from both big MM2 value lists (MM2Values and Supreme Values) plus a blended estimate, demand, rarity, stability, acronyms, sets and value history.
- Free keys need a Roblox login, a linked Discord account and a confirmed email, and must show "Data from rblxvalue.com".
What should an MM2 value API return?
A single number per item is not enough for a useful bot. Traders ask about:
- Value, ideally from more than one value list, because lists often disagree.
- Demand and rarity, which decide how easy an item is to trade.
- Stability or trend: is it rising, stable or overpaid for?
- Recent changes: value history, so you can show what moved this week.
- Acronyms: traders type
CORRorCEGUN, not full names. - Sets, with their combined value.
- Images for embeds.
RBLXValue API v2 returns all of these. See the API reference for every field.
Checklist before you choose a data source
- Is it documented? You need the field names, errors and limits. RBLXValue: docs.rblxvalue.com and a machine-readable llms.txt.
- How fresh is it? RBLXValue refreshes about every 12 hours and exposes the last update in
GET /v2/meta. - Does it show where values come from? RBLXValue keeps
value_source_a(MM2Values) andvalue_source_b(Supreme Values) separate next to the estimate. - Does it have history?
GET /v2/history/{slug}returns snapshots per source. - Is it stable? API v2 has versioned URLs; v1 is kept for old projects.
- What are the limits? Free: 30 requests/minute. Cache for 10 minutes and that is enough for most bots.
Why does a free key need a login and email?
Free keys are limited to one per person. The Roblox login (official OAuth, openid + profile only), linked Discord account and email confirmation stop people from creating hundreds of keys to get around the rate limit. RBLXValue never asks for a Roblox password, cookie or PIN.
Quick start
curl "https://api.rblxvalue.com/v2/items/CORR" -H "X-Api-Key: rbx_your_key"Returns Corrupt with its value, both source values, demand, rarity, stability and image. Complete bots with search, autocomplete and recent changes:
Asking an AI assistant to build an MM2 bot?
Point it to docs.rblxvalue.com/llms.txt and rblxvalue.com/llms.txt. Both files describe the endpoints, fields, limits and rules in plain text, so the generated code uses the right URLs and headers.
FAQ
Is there a free MM2 value API?
Yes. RBLXValue API v2 (https://api.rblxvalue.com/v2) has a free plan with 30 requests per minute. Create a key at rblxvalue.com/developer.
Which MM2 value list does the API use?
Both MM2Values and Supreme Values. Each item has value_source_a (MM2Values), value_source_b (Supreme Values) and value, the RBLXValue estimate.
Can I get MM2 value history from an API?
Yes: GET /v2/history/{slug}?period=1Y or period=ALL, optionally filtered with source=mm2values or source=supremevalues.
Do I have to credit RBLXValue?
On the free plan, yes: show "Data from rblxvalue.com" in your bot or app. Paid plans (from €9.99/month, 1,000 requests per minute) do not require it.
Is RBLXValue affiliated with Roblox or the MM2 developer?
No. RBLXValue is an independent fan project. Values are community estimates in MM2 trading units, not Robux or real money.
Links: Get a free API key · API v2 docs · docs for LLMs (llms.txt) · rblxvalue.com/llms.txt · open-source bot on GitHub