Trestle MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.0.1Updated Nov 7, 2026

Validate phone numbers, line types and TCPA litigator risk in Trestle.

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableCommunication & Collaboration Business & Commerce

Server details

Identifier: io.usefulapi/trestle
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Nov 7, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified that this server's namespace belongs to usefulapi.io, which also runs its endpoint. That identifies the publisher; it does not make the server's tools safe.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

Add a badge to your README

Show readers this MCP server is listed on SourceWeft. The badge links to this page.

[![Listed on SourceWeft](https://sourceweft.com/badge/mcp/io.usefulapi%2Ftrestle.svg)](https://sourceweft.com/mcp/io.usefulapi%2Ftrestle?utm_source=readme&utm_medium=badge)

Overview

AI-generated overview

Hosted Trestle server that lets an assistant validate phone numbers and check US numbers for TCPA litigator risk.

What you can do: Validate a phone number and get validity, country, carrier, line type, prepaid status and a 0-100 activity score
Check a US number for TCPA litigator risk as a paid add-on
Report monthly usage against the free-tier meter
Request a missing feature, upgrade to Pro or Pro+, or cancel the Pro subscription
When to use it: Useful when qualifying leads or contact lists before calling: confirming a number is valid and likely connected, or screening US numbers for TCPA litigator risk before outreach.
Requirements: Remote MCP endpoint, no local install. Sign-in uses OAuth; on first connect you supply a Trestle API key from the Trestle portal, which the server stores per user. A Trestle account is needed. Free plan allows 50 tool calls per month.

Before you install

The TCPA litigator check is a paid add-on that only works when enabled on your Trestle account. Paid plans cost money and upgrade returns a Stripe Checkout link; cancellation runs to the end of the paid period with no refund for the current period. Phone numbers you submit are sent to Trestle for lookup. Do not put an API key or Authorization header in the client config.

Installation

In SourceWeft

Open Trestle MCP by usefulapi in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.usefulapi%2Ftrestle/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "trestle-by-usefulapi": {
      "type": "http",
      "url": "https://trestle.usefulapi.io/mcp"
    }
  }
}

README

Trestle MCP by usefulapi

Use your Trestle account from Claude, Cursor, or any MCP client. Validate phone numbers and check US numbers for TCPA litigator risk. Hosted, no local install: connect with your own credentials.

Live endpoint: https://trestle.usefulapi.io/mcp · Homepage: https://usefulapi.io

Connect

Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://trestle.usefulapi.io/mcp.
Claude Code: claude mcp add --transport http trestle https://trestle.usefulapi.io/mcp, then run /mcp to log in.
VS Code: Add to VS Code.
Cursor and other clients: add the URL as a remote MCP server:

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, and the login page asks for your Trestle credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/trestle/

On first connect you provide a Trestle API key (copy it from the Trestle portal at portal.trestleiq.com). The server validates it and stores it per user. No keys go in config files.

Tools

Tool	Type	What it does
`trestle_validate_phone`	read	Validate a phone number
`trestle_check_tcpa_litigator`	read	Check a US number for TCPA litigator risk
`trestle_usage_status`	meta	Usage status (free-tier meter)
`trestle_request_feature`	meta	Request a missing feature
`trestle_upgrade`	meta	Upgrade to Pro or Pro+
`trestle_cancel_subscription`	meta	Cancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with trestle_upgrade (it returns a Stripe Checkout link). Cancel any time with trestle_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running trestle_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT — see LICENSE. Documentation only; the server is hosted.

Source: servers/trestle/README.md at commit 2450437

Tools

trestle_validate_phone

Validate a phone number

Check a phone number with Trestle Phone Validation. Returns whether it is valid, its country and carrier, its line type (Mobile, Landline, FixedVOIP, NonFixedVOIP, TollFree and so on), whether it is prepaid, and a 0-100 activity score (70 or above: likely connected; 30 or below: likely disconnected or unanswered). Does not return the owner's name. Use only for identity or lead verification, or caller routing. Never use the result for credit, insurance, employment, housing or benefits decisions (FCRA), or for marketing. Trestle Phone Validation API: GET /3.0/phone_intel.

Parametersphonerequiredcountry_hint

trestle_check_tcpa_litigator

Check a US number for TCPA litigator risk

Validate a US phone number and run Trestle's TCPA litigator check. Returns add_ons.litigator_checks['phone.is_litigator_risk']: true when the subscriber is a known TCPA litigator, null when the check could not finish. US numbers only. The check is a paid add-on and works only when it is enabled on the API key; otherwise add_ons is missing from the reply. Use it to verify leads before you call or text them. Use only for identity or lead verification, or caller routing. Never use the result for credit, insurance, employment, housing or benefits decisions (FCRA), or for marketing. Trestle Phone Validation API: GET /3.0/phone_intel with add_ons=litigator_checks.

Parametersphonerequiredcountry_hint

Version history

v1.0.1LatestNov 7, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 daysRequired25 pts
Auth declaredRequired10 pts
Tools listedRequired15 pts
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
License10 pts

Business & Commerce5 toolsNov 7, 2026

Plan	Price	Limit
Free	$0	50 tool calls / month
Pro (per user)	$9/mo or $90/yr (2 months free)	Unlimited*