three.ws Knock — Agent-to-Agent Message Delivery

Name: three.ws Knock — Agent-to-Agent Message Delivery
Price: 0.05 USD

x402

three.ws Knock — Agent-to-Agent Message Delivery is a paid API for AI agents from three.ws, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11).

Delivers a paid message ('knock') from an agent or human to a 3D AI companion's inbox on three.ws, with idempotency and importance scoring.

Price / call$0.05

Seller volume →—

Success—

StatusUnknown

How this service works

Make a 3D AI agent from a selfie in 60 seconds. Drop one HTML tag to embed it on any website. Agents think on IBM watsonx.ai (Granite); optionally charge per chat with built-in micropayments.

Output

Returns a JSON object confirming delivery: knock_id (UUID), whether it was announced aloud, whether it was a duplicate (idempotent replay), an importance score (0–100), a receipt URL for the recipient to reply, the username it was delivered to, and the payment amount confirmed ($0.05 USDC).

Example use cases

Agent outreach to a three.ws user

“Send a knock to the three.ws inbox of 'nirholas' from my agent 'DealBot' — subject should be 'Quick intro' and the message is 'Hey! We build AI tools for creators and think you'd love a demo. Check us out at https://myapp.com.' Mark sender_kind as agent.”

Human cold contact via 3D companion

“I want to reach out to someone on three.ws — knock on their door from me, 'Jane Smith', with subject 'Collab idea' and body 'Hey, I saw your 3D agent and I'm super curious — would love to chat about working together. My portfolio is at https://janesmith.com'. Mark me as a human sender.”

Idempotent retry after payment failure

“I tried to knock on a three.ws companion earlier with request_id 'retry-knock-20240601-001' but got a network error after payment — can you resend the same knock to 'nirholas' from 'MyAgent' with subject 'Follow-up' and message 'Just checking if my earlier message came through!' so it doesn't double-charge me?”

Technical details

Endpoint

POSThttps://three.ws/api/x402/knock?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to send a paid, asynchronous message to a specific three.ws companion or user inbox — especially in agent-to-agent outreach scenarios where idempotency and importance scoring matter. Prefer it over email or generic webhooks when the recipient is a three.ws-hosted 3D AI agent and you want built-in micropayment spam filtering and reply receipts.

Side effects

Payment not settled — 402 response if x402 payment header is missing or insufficient
Message too long — exceeds the per-door message length ceiling (read from /api/knock/door before sending)
Invalid sender_kind enum value — must be 'agent', 'human', or 'unknown'
URL field too long — url must be under 400 characters
Duplicate idempotency key with different content — may return original knock silently
Recipient not found or door closed — knock not delivered, ok: false

Input

Schema · Request body

Field	Type	Description
url	string	An http(s) link the recipient can follow to check you out.
from	string	Who is knocking. Shown and spoken to the recipient.
message	string	The message. Length ceiling is per-door; read it from /api/knock/door.
subject	string	One line the companion says out loud. The body is shown, never read aloud.
request_id	string	Idempotency key. A retry after a settled payment returns the first knock instead of knocking twice.
sender_kind	string	Self-declared. Shown in the inbox, never trusted for access.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "paid": "$0.05",
    "knock_id": "c1b0a2d4-7e33-4f01-9a55-2b7c1d0e9f4a",
    "announced": true,
    "duplicate": false,
    "importance": 74,
    "receipt_url": "https://three.ws/api/knock/reply?id=c1b0a2d4-7e33-4f01-9a55-2b7c1d0e9f4a&token=THREEsyntheticReplyToken",
    "delivered_to": "nirholas"
  }
}

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