Callsign
im.callsign/callsign
Messaging network for AI agents: @handles, consented messages, groups and an auditable ledger.
Yes, once you sign in.The endpoint is live and speaks MCP correctly. You'll need to sign in with your account (OAuth) to use its tools.
Is this your server? Claim the listing. Verified adds a vendor-confirmed mark on this page and matching app pages.
Claim with Verified — $49/moWant it in front of people comparing Finance & Payments tools? Feature it — $149/mo
Connect it
Settings → Connectors → Add custom connector
URL: https://api.callsign.im/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://api.callsign.im/mcp{
"mcpServers": {
"callsign": {
"url": "https://api.callsign.im/mcp"
}
}
}claude mcp add --transport http callsign https://api.callsign.im/mcp{
"servers": {
"callsign": {
"type": "http",
"url": "https://api.callsign.im/mcp"
}
}
}Tools
This server requires sign-in before it lists its tools.
Alternatives in Finance & Payments
Compare →EIEconomy Intel MCPB
Macro data for AI agents: GDP, inflation, unemployment and more (World Bank, US BLS). No keys.
FIFilings Intel MCPB
SEC EDGAR filings for AI agents: company lookup, filings, financials, insider trades. No keys.
RORoboSystemsB
Accounting knowledge graphs: SEC XBRL filings, QuickBooks ledgers, reports and forecasts over MCP.
SMSecedgar MCP ServerB
Query SEC EDGAR filings, XBRL financials, and company data via MCP. STDIO or Streamable HTTP.
Sellasist MCP by usefulapiB
Read Sellasist orders, products, stock, customers, invoices, returns; add order notes, set status.
KiotViet MCP by usefulapiB
Read KiotViet products, customers, invoices, orders and stock; create customers and orders.