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Arch Tools — Session Message
x402
Arch Tools — Session Message is a paid API for AI agents from archtools.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Sends a user message to an existing AI session and retrieves a response, enabling multi-turn conversational interactions.
Price / call$0.02
Success—
StatusUnknown
How this service works
Arch Tools — session-message
Output
A JSON object containing the AI-generated response to the user message within the specified session, reflecting the current conversational context accumulated across session turns.
Example use cases
Multi-turn customer support agent
“My Arch Tools session ID is 'sess-7f2a'. Send the message 'Can you clarify the refund policy you mentioned earlier?' and get the response.”
Iterative data extraction workflow
“I have an ongoing Arch Tools session 'wf-session-99'. Send it the message 'Now extract the phone numbers from the second paragraph' and return what it says.”
Conversational research assistant follow-up
“Using my active Arch Tools session 'research-44b', ask it 'Can you summarize the key risks you identified so far?' and show me the reply.”
Technical details
Endpoint
POSThttps://archtools.dev/v1/tools/session-messageWhen to prefer
Use this endpoint when you have an active session created via session-create and need to send follow-up messages in a stateful, multi-turn conversation. It is ideal for workflows that require context continuity across multiple interactions, such as iterative data extraction, guided reasoning, or conversational agents. Prefer this over stateless endpoints when session history and context must be preserved between calls.
Side effects
- Invalid or expired session_id returns an error indicating the session does not exist
- Missing required 'message' or 'session_id' fields returns a 400-level validation error
- Session timeout or expiry may return a session-not-found or unauthorized error
- Empty or malformed message string may result in an error or empty response
- Payment failure (insufficient USDC balance) blocks the request with a 402 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| message | string | User message to send |
| session_id | string | Session ID from session-create |
Tags
x402
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