usefulapi

Anvil MCP server. Hosted MCP server for Anvil — fill & generate PDFs and run Etch e-signature packets for AI agents.

Claude

Open Settings → Connectors → Add custom connector
Paste this URL:
https://anvil.usefulapi.io/mcp
Authenticate with Anvil when prompted

Cursor · VS Code · Windsurf · Cline

Add to your MCP config, then reload & authorize:

{
  "mcpServers": {
    "anvil": {
      "url": "https://anvil.usefulapi.io/mcp"
    }
  }
}

live12 toolsFree 100 tool calls / monthPro $9/mo · $90/yr

Tools 12

Tool	Type	What it does
`anvil_current_user`	read	Current user Get the authenticated Anvil user behind the API key plus every organization they belong to (eid, name, slug) — the best first call to discover the org identifiers other tools need.
`anvil_get_organization`	read	Get organization Fetch an organization by slug or eid together with its PDF templates (casts) and workflows (welds), so you can browse what is available to fill or submit.
`anvil_get_cast`	read	Get cast Fetch a cast — an Anvil PDF template — by eid, returning its title, version number, and template flag; its eid is what you pass to anvil_fill_pdf.
`anvil_get_etch_packet`	read	Get etch packet Fetch an Etch e-signature packet by eid, including its status, details URL, document group, and every signer's name, email, routing order, and signing status — the way to check signature progress.
`anvil_get_weld`	read	Get weld Fetch a weld — an Anvil workflow — by eid along with its forges, the individual form steps (eid, name, slug).
`anvil_get_weld_data`	read	Get weld data Fetch a single weldData submission to a weld by eid, reporting its completion state, test flag, and creation time.
`anvil_fill_pdf`	write	Fill pdf Fill an Anvil PDF template (cast) with a map of field aliases to values and return the finished PDF as base64, ready to download or forward.
`anvil_generate_pdf`	write	Generate pdf Generate a brand-new PDF from raw HTML or Markdown and return it as base64, with optional CSS styling and embedded title metadata.
`anvil_create_etch_packet`	write	Create etch packet Create an Etch e-signature packet from documents and signers; it defaults to a safe draft that sends nothing, and only emails signers when you set isDraft=false.
`anvil_generate_etch_sign_url`	write	Generate etch sign url Generate a one-time embedded signing URL for a specific signer in an Etch packet, for iframe or redirect signing flows.
`anvil_usage_status`	meta	Usage status (free-tier meter) Report the caller's current free-tier usage this month: calls used, monthly limit, remaining, and whether the cap is reached. Read-only; does not count against the meter.
`anvil_upgrade`	meta	Upgrade to Pro (unlimited) Subscribe to the Pro plan for UNLIMITED Anvil tool calls (the free tier caps monthly usage). Choose monthly ($9/month) or yearly ($90/year — 2 months free) billing. Returns a Stripe Checkout link to open in your browser; after payment your account upgrades automatically. Read-only; does not count against the meter.

Pricing

Plan	Price	Limit
Free	$0	100 tool calls / month
Pro	$9/mo · $90/yr	Unlimited

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.