Api Endpoint

Orthogonal

Reply to a specific message

Open interactive test console

Offering

Provider: Orthogonal
Method: POST
Offering type: Api Endpoint
Transport type: http
Category: Infrastructure
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://np.orthogonal.com/agentmail/v0/inboxes/%7Binbox_id%7D/messages/%7Bmessage_id%7D/reply
MIME type: application/json
First seen: 2026-10-16T01:50:03.832Z
Last seen: 2026-11-04T17:19:50.301Z
Tags: X402, paid-api, orthogonal-proxy, agentmail, data-apis, Email, AI-agents, inbox, Messaging

Website Documentation OpenAPI

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2: 10000 atomic units
Atomic price: 10000 · Network: eip155:5042 · Asset: 0x3600000000000000000000000000000000000000 · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0xaA4a75114b5BdA671844ae10256d2B048dF8fdc3"
  },
  {
    "scheme": "exact",
    "network": "eip155:5042",
    "asset": "0x3600000000000000000000000000000000000000",
    "amount": "10000",
    "payTo": "0xaA4a75114b5BdA671844ae10256d2B048dF8fdc3"
  }
]

Observed health

Status: Healthy
Latest latency: 52 ms
Average latency: 648 ms
HTTP status: 204
Last checked: 2026-11-02T09:41:24.445Z
Reachability: 100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "body": {
    "type": "object",
    "title": "ReplyToMessageRequest",
    "properties": {
      "cc": {
        "oneOf": [
          {
            "type": "string"
          },
          {
            "type": "array",
            "items": {
              "type": "string"
            }
          }
        ],
        "title": "Addresses"
      },
      "to": {
        "$ref": "#/components/schemas/type_messages:Addresses",
        "title": "SendMessageTo",
        "description": "Recipient address or addresses."
      },
      "bcc": {
        "$ref": "#/components/schemas/type_messages:Addresses",
        "title": "SendMessageBcc",
        "description": "BCC recipient address or addresses."
      },
      "html": {
        "type": "string",
        "title": "MessageHtml",
        "description": "HTML body of message."
      },
      "text": {
        "type": "string",
        "title": "MessageText",
        "description": "Plain text body of message."
      },
      "labels": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "title": "MessageLabels",
        "description": "Labels of message."
      },
      "headers": {
        "type": "object",
        "title": "SendMessageHeaders",
        "description": "Headers to include in message.",
        "additionalProperties": {
          "type": "string"
        }
      },
      "reply_to": {
        "$ref": "#/components/schemas/type_messages:Addresses",
        "title": "SendMessageReplyTo",
        "description": "Reply-to address or addresses."
      },
      "reply_all": {
        "type": "boolean",
        "title": "ReplyAll",
        "description": "Reply to all recipients of the original message."
      },
      "attachments": {
        "type": "array",
        "items": {
          "type": "object",
          "title": "SendAttachment",
          "properties": {
            "url": {
              "type": "string",
              "description": "URL to the attachment."
            },
            "content": {
              "type": "string",
              "description": "Base64 encoded content of attachment."
            },
            "filename": {
              "type": "string",
              "title": "AttachmentFilename",
              "description": "Filename of attachment."
            },
            "content_id": {
              "type": "string",
              "title": "AttachmentContentId",
              "description": "Content ID of attachment."
            },
            "content_type": {
              "type": "string",
              "title": "AttachmentContentType",
              "description": "Content type of attachment."
            },
            "content_disposition": {
              "enum": [
                "inline",
                "attachment"
              ],
              "type": "string",
              "title": "AttachmentContentDisposition",
              "description": "Content disposition of attachment."
            }
          }
        },
        "title": "SendMessageAttachments",
        "description": "Attachments to include in message."
      }
    }
  },
  "type": "http",
  "method": "POST",
  "bodyType": "json",
  "pathParams": {
    "type": "object",
    "required": [
      "inbox_id",
      "message_id"
    ],
    "properties": {
      "inbox_id": {
        "$ref": "#/components/schemas/type_inboxes:InboxId",
        "description": "path parameter"
      },
      "message_id": {
        "$ref": "#/components/schemas/type_messages:MessageId",
        "description": "path parameter"
      }
    }
  }
}

Output schema

{
  "type": "object",
  "title": "SendMessageResponse",
  "required": [
    "message_id",
    "thread_id"
  ],
  "properties": {
    "thread_id": {
      "type": "string",
      "title": "ThreadId",
      "description": "ID of thread."
    },
    "message_id": {
      "type": "string",
      "title": "MessageId",
      "description": "ID of message."
    }
  }
}