btw

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Agentic group buying. Agents pool demand into chains that clear at a group price. Waitlist is open.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "btw": {
      "url": "https://btw.space/mcp?utm_source=mcp-registry",
      "transport": "streamable-http"
    }
  }
}

Measured tools (19)

• my_agent read-only

  What your human's btw agent is watching, with a status on each thing: watching (counting the other agents), group forming (enough want it that btw is talking to the brand), or live (there's a price and a deadline, hold a spot). Takes their email. The list opens once they've clicked the confirm link btw emailed them the first time you called.

  Parameters:

  • email (required) — string — your human's email

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• waitlist

  Old style: put your human on the list to hear when the next product goes live. Prefer want with a link, or hold on what's live. Needs their email. Optionally say what they want to buy and which agent platform you are.

  Parameters:

  • want — string — what your human wants to buy, plainly
  • email — string — your human's email
  • platform — string — your agent platform, like claude, grok, chatgpt, other
  • referral — string — a friend's referral code or link, if you came through one

  Hints: read-only no · destructive no · idempotent yes · open-world no

• list_chains read-only

  Every product btw has run or queued: the live one, what's up next by wants, and what filled or closed. Use status for the live one.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• hold

  Hold your human a spot on the live product. Needs their email. Returns the price this spot locks and a link where they save a card; the spot is held once they do. The first spots lock at the early price; every spot after locks at the group price. The result says which one this spot got. Nothing is charged now. If the product fills, the deposit is charged and applied to their purchase; they pay the balance to the brand. If it doesn't fill, nobody pays. Stripe test mode. Test cards only, no real money moves.

  Parameters:

  • email (required) — string — your human's email
  • ref — string — a referral code from another buyer's link, the r= part
  • name — string — first name and last initial, shown on the product page
  • chain — string — a product slug; leave it out for what's live
  • invite_code — string — not needed any more
  • max_price_usd — number — optional cap on the deposit in dollars

  Hints: read-only no · destructive no · idempotent not declared · open-world no

• join

  The old name for hold. Hold your human a spot on the live product. Needs their email. Returns the price this spot locks and a link where they save a card; the spot is held once they do. The first spots lock at the early price; every spot after locks at the group price. The result says which one this spot got. Nothing is charged now. If the product fills, the deposit is charged and applied to their purchase; they pay the balance to the brand. If it doesn't fill, nobody pays. Stripe test mode. Test cards only, no real money moves.

  Parameters:

  • email (required) — string — your human's email
  • ref — string — a referral code from another buyer's link, the r= part
  • name — string — first name and last initial, shown on the product page
  • chain — string — a product slug; leave it out for what's live
  • invite_code — string — not needed any more
  • max_price_usd — number — optional cap on the deposit in dollars

  Hints: read-only no · destructive no · idempotent not declared · open-world no

• status read-only

  What's live: the product, its list and group price, how many buyers unlock the price, how many are committed, how many want it, spots left, and the deadline if one is set. Give a slug to ask about another product, and an email to also see that person's spot.

  Parameters:

  • chain — string — a product slug; leave it out for what's live
  • email — string — check this person's spot

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• release destructive

  Release a held spot. Needs the product slug, the email that holds it, and the commitment id from hold or status. Nothing is charged for a released spot.

  Parameters:

  • chain (required) — string — product slug
  • email (required) — string
  • commitment_id (required) — string

  Hints: read-only no · destructive yes · idempotent not declared · open-world no

• leave destructive

  The old name for release. Release a held spot. Needs the product slug, the email that holds it, and the commitment id from hold or status. Nothing is charged for a released spot.

  Parameters:

  • chain (required) — string — product slug
  • email (required) — string
  • commitment_id (required) — string

  Hints: read-only no · destructive yes · idempotent not declared · open-world no

• park

  Old style: park what your human wants in plain words with the most they'd pay. Prefer want with a link.

  Parameters:

  • description (required) — string — what your human wants, plainly
  • max_price_usd (required) — number — the most they'd pay, in dollars
  • email — string — optional, so we can say when a chain opens

  Hints: read-only no · destructive no · idempotent not declared · open-world no

• want

  Add something to your human's btw agent. Takes a link or an ASIN plus their email; a new email gets an agent. A hotel link becomes a stay (give month, and nights if known), a subscription link becomes software (give plan), anything else is gear. Or set type and the fields outright: stay needs hotel and month, home needs job and zip, software needs product and plan. Their agent starts watching it and the reply says how many other agents already want it. If you already read a page yourself, pass asins instead of a link. btw doesn't buy from Amazon. The link is how we know what you want; the group price comes from the brand.

  Parameters:

  • email (required) — string — your human's email, same as the waitlist
  • job — string — home: solar, home-battery, ev-charger, heat-pump, roof, windows, sauna-install, other
  • url — string — a product, hotel, or subscription link
  • zip — string — home: five digit US zip
  • asin — string — an Amazon ASIN, 10 letters and digits
  • name — string — gym: the gym or studio name
  • note — string — home or stay: a short note
  • plan — string — software: individual, family, team, other
  • type — string — skip auto-detection and say the type
  • asins — array — ASINs you read off a page yourself, up to 100
  • hotel — string — stay: hotel name or link
  • month — string — stay: month as YYYY-MM
  • nights — integer — stay: nights, if known
  • product — string — software: product name or link

  Hints: read-only no · destructive no · idempotent yes · open-world yes

• sync_wishlist

  Read a public wishlist and add every item to your human's btw agent. Amazon wishlists and Steam wishlists. Takes the list link plus their email; a new email gets an agent. Returns the items found and how many other agents want each one. If the server can't read the list, the reply says so; then open the list yourself and pass the ASINs, or call want once per product link. btw doesn't buy from Amazon. The link is how we know what you want; the group price comes from the brand.

  Parameters:

  • email (required) — string — your human's email, same as the waitlist
  • url — string — the list link. Amazon: open the list, tap Share, copy the link. Steam: the profile's wishlist page
  • asins — array — ASINs you read off the list yourself, up to 100

  Hints: read-only no · destructive no · idempotent yes · open-world yes

• want_stay

  Your human wants a hotel in a given month. Takes the hotel (name or link), the month as YYYY-MM, nights if known, and their email. People wanting the same hotel in the same month count together; when enough do, btw asks the hotel for a group rate. Returns how many others want it.

  Parameters:

  • hotel (required) — string — hotel name or a link to it
  • month (required) — string — month as YYYY-MM
  • email (required) — string — your human's email, same as the waitlist
  • note — string
  • nights — integer — nights, if known

  Hints: read-only no · destructive no · idempotent yes · open-world yes

• want_home

  Your human wants a home job done: solar, home-battery, ev-charger, heat-pump, roof, windows, sauna-install, other. Takes the job, their five digit zip, an optional note, and their email. Homes near each other wanting the same job count together; when enough do, btw gets a group quote from local installers. Returns how many others nearby want it.

  Parameters:

  • job (required) — string — the job
  • zip (required) — string — five digit US zip
  • email (required) — string — your human's email, same as the waitlist
  • note — string — anything the installer should know

  Hints: read-only no · destructive no · idempotent yes · open-world no

• want_software

  Your human wants a software subscription at group pricing. Takes the product (name or link), the plan (individual, family, team, other), and their email. Annual plans; vendors already have volume tiers and btw brings the volume. Returns how many others want the same product on the same plan.

  Parameters:

  • product (required) — string — product name or a link to it
  • plan (required) — string — the plan
  • email (required) — string — your human's email, same as the waitlist

  Hints: read-only no · destructive no · idempotent yes · open-world no

• want_gym

  Your human wants a membership at a gym or studio near them. Takes the name, their five digit zip, the plan (monthly, annual, class-pack, other), and their email. People near the same gym on the same plan count together; when enough do, btw asks for a group rate.

  Parameters:

  • name (required) — string — gym or studio name
  • zip (required) — string — five digit US zip
  • plan (required) — string — the plan
  • email (required) — string — your human's email, same as the waitlist

  Hints: read-only no · destructive no · idempotent yes · open-world no

• book_stats read-only

  Counts at a glance: live, queued, filled. Use status for the live product.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• get_chain read-only

  One product by slug. Prefer status.

  Parameters:

  • id (required) — string — chain slug

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• join_chain read-only

  The old v1 join. Use hold instead.

  Parameters:

  • id — string
  • team_name — string
  • monthly_commit_usd — number

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• park_intent read-only

  The old v1 park. Use want with a link instead.

  Parameters:

  • note — string
  • category — string
  • provider — string
  • monthly_cap_usd — number
  • min_discount_pct — number

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

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