openapi: 3.0.3
info:
  title: Let's Encrypt ACME Account Nonce API
  description: The ACME (Automatic Certificate Management Environment) protocol API used by Let's Encrypt to automate the issuance, renewal, and revocation of TLS certificates. Implements RFC 8555.
  version: '1.0'
  contact:
    name: Let's Encrypt
    url: https://letsencrypt.org/docs/
  license:
    name: Mozilla Public License 2.0
    url: https://www.mozilla.org/en-US/MPL/2.0/
servers:
- url: https://acme-v02.api.letsencrypt.org
  description: Production ACME endpoint
- url: https://acme-staging-v02.api.letsencrypt.org
  description: Staging ACME endpoint
tags:
- name: Nonce
  description: Anti-replay nonces for JWS-signed requests
paths:
  /acme/new-nonce:
    head:
      tags:
      - Nonce
      summary: Get a new nonce
      description: Returns a fresh nonce in the Replay-Nonce header for use in JWS requests.
      operationId: newNonce
      responses:
        '200':
          description: Nonce returned in Replay-Nonce header
          headers:
            Replay-Nonce:
              schema:
                type: string