---
title: "Publish an agent profile to Ontario's paid discovery directory"
method: POST
path: "/api/x402/list-agent"
tags: ["agent-listing", "agent-discovery", "directory"]
---

# Publish an agent profile to Ontario's paid discovery directory

`POST /api/x402/list-agent`

Validate and submit an agent card for discoverability by agent builders and marketplace operators. The 0.10 USDC fee is an anti-spam listing fee and does not purchase certification or guarantee traffic.

## Request body

- object
  - `agent_card_url` string, uri, required
  - `description` string
  - `name` string, required
  - `owner_contact` string
  - `owner_url` string, uri
  - `tags` string[]

## Response `200`

Listing accepted

- object
  - `listing` object
  - `status` string

## Other responses

- `402` — Payment required

---

[API](https://skmtc.net/ontarioprotocol/apis/ontario-protocol-x402-api.md) · [All operations](https://skmtc.net/ontarioprotocol/apis/ontario-protocol-x402-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/ontarioprotocol/ontario-protocol-x402-api/versions/54384a1c4bf3/schema)