Read waivers, signed participants and check-ins in Otter Waiver. For tour, rental and event operators that collect signed waivers with Otter Waiver. Hosted by usefulapi — connect from Claude, ChatGPT, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"otter-waiver": {
"url": "https://otter-waiver.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"otter-waiver": {
"type": "http",
"url": "https://otter-waiver.usefulapi.io/mcp"
}
}
}No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run these commands. The second one opens the login page:
Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see Before you connect.
List the waivers of the account and filter by event name or title. See which waivers are in draft, active or inactive.
otterwaiver_list_waivers
Open one waiver to read its full text, settings and extra fields. Check the wording before an event.
otterwaiver_get_waiver
List the 50 latest participants who signed a waiver, with the sign times. Open one participant to read the details.
otterwaiver_list_latest_participants otterwaiver_get_participant
List the 50 latest check-ins to see who arrived at today's activity.
otterwaiver_list_latest_checkins
The login page asks for your Client ID and Client Secret.
Find both in app.ottersign.com → Settings → Account and Preferences → API keys (use Show). They are used only to call the API on your behalf and to derive a private account id; they are never shown to anyone.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Client ID and Client Secret. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
Turn on the Otter Waiver connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
otterwaiver_list_waivers | read | List waivers List the waivers of the account (title, event, status draft/active/inactive, activities, response counts). Page numbers are required by the API; the defaults are page 1 with 20 records. Filter by event name (waiver folder title) or waiver title. API: GET /waivers. |
otterwaiver_get_waiver | read | Get waiver Get one waiver with its full text, settings, additional fields and signed participants. Get the id from otterwaiver_list_waivers. API: GET /waivers/{id}. |
otterwaiver_list_latest_participants | read | List latest participants List the 50 most recent participants who signed a waiver: signer contact data, emergency contact, answers to extra questions, timestamps and document links. The data is personal data of the signers. API: GET /participants/latest. |
otterwaiver_list_latest_checkins | read | List latest check-ins List the 50 most recent participant check-ins, with the same fields as otterwaiver_list_latest_participants (the checkedIn timestamp is set). API: GET /participants/latest/checkins. |
otterwaiver_get_participant | read | Get participant Get one participant (adult or minor) by id: signer data, waiver id, timestamps, document and certificate links. Get the id from the participant lists or from a waiver. API: GET /participants/{id}. |
otterwaiver_usage_status | Usage status (free-tier meter) Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter. | |
otterwaiver_request_feature | Request a missing feature Tell usefulapi that the user needs something the Otter Waiver tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter. | |
otterwaiver_upgrade | Upgrade to Pro (unlimited*) Get Pro: unlimited tool calls (fair use limit: 10,000 a month) on Otter Waiver (the free tier caps monthly usage). Plans: "monthly" — $9/month; "yearly" — $90/year (2 months free). Cancel any time: Pro then runs to the end of the paid period, so it also suits a one-time job. *A fair use limit applies. For heavy use (near Pro's limit): "plus" or "plus_yearly" — Pro+, $39/month or $390/year, unlimited tool calls (fair use limit: 100,000 a month); an existing Pro subscription changes to Pro+ in place (needs confirm: true; the price difference for the rest of the period is charged at once). Otherwise returns a short link to open in your browser (it opens Stripe Checkout); after payment the account upgrades automatically. Does not count against the meter. | |
otterwaiver_cancel_subscription | Cancel the Pro subscription Cancel the caller's Otter Waiver Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run otterwaiver_upgrade later to undo the cancel before the period ends. Does not count against the meter. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper user | $9/mo · $90/yr | Unlimited* |
*Pro fair use limit: 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this Otter Waiver server only. Subscribe with otterwaiver_upgrade (it returns a Stripe Checkout link). Cancel any time with otterwaiver_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running otterwaiver_upgrade before then undoes the cancel. Or write to [email protected].
List the waivers and their status. Read the full text of a waiver. See who signed in the last days. Review the latest check-ins. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Otter Waiver. The server calls the Otter Waiver API with your own Otter Waiver access, so it sees only the data that your account can see.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
The login page asks for your Client ID and Client Secret. See Before you connect for where to find them.
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Client ID and Client Secret. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Otter Waiver API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Otter Waiver.
All 5 Otter Waiver tools are marked read-only.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls (fair use limit: 10,000 tool calls a month), for this Otter Waiver server only. Cancel any time: Pro then runs to the end of the paid period. Run otterwaiver_usage_status to see how many calls you used.
Ask the AI to run otterwaiver_upgrade: it returns a Stripe Checkout link. To cancel, run otterwaiver_cancel_subscription. Pro continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with otterwaiver_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.