Counterparty Check

io.github.chtwebllcPublished by GitHub account chtwebllcv1.0.1Updated Oct 24, 2026

Check a payee before your agent pays: sanctions, lookalike domains, payment details, invoice fraud.

The publisher's own server: check.tattoo: tattoo size and placement guide

VerifiedStreamable HTTPWeb executableFinanceSecurity & Monitoring

Overview

AI-generated overview

A remote MCP server that lets an assistant run pre-payment risk checks on payees: sanctions screening, lookalike domains, payment detail validation and invoice-

What you can do
Run a full pre-payment risk check on a payee, covering sanctions, domain age and email authentication, lookalike domains, routing/IBAN/SWIFT/wallet validation and business-email-compromise signals, returning a verdict and a receipt. Screen a payee name and optional crypto wallet against OFAC sanctions lists and embargoed jurisdictions. Check the remaining prepaid balance on the API key. Verify that a receipt from an earlier check is authentic and unaltered.
When to use it
Use it when an assistant is about to approve or send a payment and you want a risk verdict on the payee first. The lighter sanctions screen suits quick name or wallet checks; the full check is for invoice and vendor fraud review.
Requirements
A remote endpoint at counterpartycheck.com over streamable HTTP. A bearer API key (cc_live_...) sent in the Authorization header is required; keys are bought on the provider's pricing page. Paid calls draw from a prepaid balance.
Before you install
The API key is a secret sent in the Authorization header and tied to a prepaid balance. Screening costs money: the full check and the sanctions screen draw from the balance, while the first 3 screens each day are free without a key. Payee names, wallets and payment details are sent to a third-party service.

Installation

In SourceWeft

  1. Open Counterparty Check in the dashboard and add it to a workspace.
  2. Connect Authorization token credentials. They are stored privately and never shown on public pages.
  3. 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.github.chtwebllc%2Fcounterparty-check/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": {
    "counterparty-check": {
      "type": "http",
      "url": "https://counterpartycheck.com/mcp",
      "headers": {
        "Authorization": "Bearer <YOUR_TOKEN>"
      }
    }
  }
}

Tools

4

check_counterparty

Check a payee before paying

Run a full pre-payment risk check on a payee: OFAC sanctions (names and wallets), domain age and email authentication, lookalike domains (vendor impersonation, brand typo-squats, executive impersonation), routing/IBAN/SWIFT/wallet validation, and business-email-compromise signals. Returns verdict proceed/review/block, a 0-100 risk score, explained findings, and a signed receipt. Costs $0.25 from the API key balance. Fill in "context" with everything you know about how the payment request arrived; it materially improves fraud detection.

Parameterscontextpaymentcounterpartyrequired

screen_sanctions

Sanctions screen only

Screen a payee name (and optional crypto wallet) against OFAC sanctions lists and embargoed jurisdictions. Faster and cheaper than check_counterparty but does not detect fraud patterns. Costs $0.05 from the API key balance; without a key, the first 3 screens each day are free.

Parameterscontextpaymentcounterpartyrequired

check_balance

API key balance

Show the remaining prepaid balance on the API key used for this connection. Free.

Takes no parameters.

verify_receipt

Verify a check receipt

Confirm that a receipt returned by a previous check is authentic and unaltered. Free.

Parametersreceiptrequired

Version history

2
  1. v1.0.1LatestOct 16, 2026
  2. v1.0.0Oct 15, 2026

Score

83% 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

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.

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