Your agent can run the numbers, too.

Connect with MCP

Add this Streamable HTTP endpoint to your MCP client:

https://llmmargin.com/mcp

Call estimate_ai_service. For private quotes, connect to https://llmmargin.com/agent/mcp and complete OAuth sign-in and consent. Private tools: list_quotes, get_quote, and save_quote.

Or use the REST API

curl https://llmmargin.com/api/estimate \
  -H 'Content-Type: application/json' \
  -d '{"monthlyRequests":10000,"marginPercent":60}'

Omitted inputs use documented example defaults. Replace them with your own costs. OpenAPI specification includes bounds, paths, and authorization scopes.

A2A and browser tools

The synchronous A2A 0.3.0 endpoint /a2a accepts message/send with one data part containing quote inputs. It returns a structured estimate. It does not support streaming or persisted tasks. Agent card.

On the quote calculator, browsers supporting WebMCP expose the read-only estimator through document.modelContext (with compatibility for earlier navigator-based implementations). Other browsers can use REST or MCP.

Private stays private

OAuth 2.1 uses PKCE S256 and explicit consent. Read access and draft-writing are separate scopes. Agents can access only the approving user’s quotes. You can revoke connections in your account.

Exports require a confirmed purchase or active Pro access. A payment-required response is not permission to purchase. The user must review the quote and pay on Stripe. Agents cannot initiate checkout or send a proposal to a client.

Discovery & limits

Public pages support Accept: text/markdown and /index.md. Discover the API catalog, integrity-checked skill, and reading guide. Public agent requests: 120 per IP per minute. Private agent requests: 60 per user per minute. Maximum JSON body: 16 KiB.

Content policy: search and AI inference allowed; model training not permitted. Private quotes are never included in sitemaps or public discovery. We do not operate an outbound browsing agent, so Web Bot Auth is not advertised.