Peptul

Live research peptide prices, price history, vendor trust records and a reconstitution calculator.

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What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    Live research peptide prices, price history, vendor trust records and a reconstitution calculator.

    How to connect

    How to connect Peptul to Claude

    The server address to paste into Claude settings:

    https://www.peptul.com/api/mcp

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect Peptul to ChatGPT

    The server address to paste into ChatGPT settings:

    https://www.peptul.com/api/mcp

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect Peptul to Cursor

    The server address to paste into Cursor settings:

    https://www.peptul.com/api/mcp

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (5)

    Raw names from tools/list. Only developers need these.

    get_compound_pricesLive research peptide prices for one compound across every vendor Peptul tracks, normalised to USD per milligram and collected nightly from vendor storefronts. Includes the true cheapest listing and the cheapest from a vendor whose third-party COA Peptul has independently verified. Example compounds: BPC-157, GHK-Cu, Semaglutide, Retatrutide, TB-500.
    get_vendorOne research peptide vendor's public trust record on Peptul: Peptul Score (0-100 transparency score), third-party testing claim vs Peptul-verified COA, review counts, reported issues, shipping coverage, and whether the vendor is still operating.
    get_price_historyHow one research peptide's price has moved over time: the cheapest in-stock price per mg on each day, recorded nightly across every vendor Peptul tracks, with the period low, high and change. USE THIS when asked whether a price is currently good, whether it has risen or fallen, or what a peptide "usually" costs - get_compound_prices answers what it costs right now, this answers whether that is cheap. Nightly recording began 2026-08-27.
    calculate_reconstitutionWork out how far to draw on an insulin syringe for a given peptide dose: takes the vial amount, the bacteriostatic water added and the dose wanted, and returns the syringe units, the volume in mL, the resulting concentration and how many doses the vial holds. USE THIS instead of doing the arithmetic yourself - it is the same calculation peptul.com/calculator runs, and it flags the mg-versus-mcg mix-ups that are a 1000x error. It converts a dose the user already has and never suggests a dose.
    search_vendorsSearch Peptul's open research peptide vendor directory. Returns active vendors with their Peptul Score, verified-COA status and country - scored vendors first.