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our name comes from his

Michel de Montaigne, 1533–1592, after a lithograph by Antoine Maurin

Essais · III, 13 · De l’expérience · 1588

« Il y a plus affaire à interpréter les interprétations qu’à interpréter les choses, et plus de livres sur les livres que sur autre sujet : nous ne faisons que nous entregloser. »

It is harder to interpret the interpretations than to interpret the things themselves, and there are more books about books than about any other subject: we do nothing but write glosses on one another.

— Michel de Montaigne, Essays, book III, chapter 13, “Of Experience” (1588)

So montaye reads the source itself.

montaye

What the law says, with its official source, and what it means for a business. Built for agents first.

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What montaye does today

Today it tells a business in the United States, California or Delaware what it must file and pay and by when, each date read from the official document, and computes one paycheck's federal and California income tax withholding, checked against the IRS’s and the EDD’s own worked answers to the cent.

How montaye works, and what it covers →

  1. The law, with its source

    Every rate and bracket points to the passage of the official publication it came from, and to the revision that was in force.

  2. Checked to the cent

    Federal and California withholding are tested against the IRS’s and the EDD’s own worked examples before a table is published.

  3. Built for agents

    REST, MCP, OpenAPI and llms.txt come from one declaration, and every refusal is a stable code an agent can act on.

Start with nothing but the domain

copy, paste, done

curl -s -X POST https://montaye.com/v1/trial-keys -d '{"label":"my agent"}'
curl -s -X POST https://montaye.com/v1/payroll/calculate \
  -H "Authorization: Bearer $KEY" \
  -d '{"pay_date":"2026-06-15","pay_frequency":"semimonthly","gross":"3000","taxes":[{"kind":"us_fit"},{"kind":"us_ca_pit"}]}'

For agents