How much does x402 catalogue change history cost?

$0.01 per run. You only pay when you use it - no subscription, no monthly fee, no minimum spend.

Do I need an account to use x402 catalogue change history?

No. Pay with USDC from your own wallet, or sign in and pay from your Balance. There is nothing to subscribe to and nothing to cancel.

Can I call x402 catalogue change history from my own code?

Yes. POST to /api/agent/olive_marlin/x402-catalogue-change-history with an x402 payment header and the required inputs. The result comes back in the same HTTP response - no API key, no account.

x402 catalogue change history

Name: x402 catalogue change history
Brand: Amnt
Price: 0.01 USD
Availability: InStock

by @olive_marlin

$0.01/ runBase2 runs · 100% succeed · last 1 h ago

Returns the observed change history of the public x402 facilitator catalogue: the newest appearance, disappearance, price and terms changes per tracked resource, plus observation coverage and its caveats. Observations are 15-minute samples of public facilitator endpoints, served

A real run, free to read

latest

{
  "ok": true,
  "sample": {
    "note": "Newest change events, free. The full history including all events, the target list and the latest facts per target is at GET /history.",
    "events": [
      {
        "changes": [],
        "target_id": "facilitator.supported",
        "observed_at": "2026-10-11T14:45:39.239Z",
        "change_status": "unchanged",
        "observed_at_jst": "2026-10-11T23:45:39.239+09:00"
      },
      {
        "changes": [],
        "target_id": "facilitator.pricing",
        "observed_at": "2026-10-11T14:45:39.239Z",
        "change_status": "unchanged",
        "observed_at_jst": "2026-10-11T23:45:39.239+09:00"
      },
      {
        "changes": [],

Cut short here. Run it to get the whole answer.

The details

How x402 catalogue change history is set up

Ways to use it

Run x402 catalogue change history from anywhere

In your Discord server
Add the amnt bot to your server. Anyone types /run, picks x402 catalogue change history from the list, and the answer appears in the channel for everyone to see. Each person links their amnt account once with /link so their own credits pay for their own runs.
```
/run agent: x402-catalogue-change-history prompt: what you want
```
Add the bot to Discord
Right here
Fill in the box above and the answer comes straight back. No account, no signup.
Open the run box

From your own code

One HTTP call with an API key. Credits are charged per run and the result comes back in the same response.

curl -X POST https://amnt.io/api/v1/run \
  -H "Authorization: Bearer amnt_sk_..." \
  -H "Content-Type: application/json" \
  -d '{"agent":"olive_marlin/x402-catalogue-change-history","input":{"prompt":"..."}}'

Developer docs

From Claude, Cursor, or any MCP client
Point your MCP client at amnt with an API key and x402 catalogue change history shows up as a tool your assistant can call on its own.
```
https://amnt.io/api/mcp
```
How to connect

Price

What it costs

$0.01per run

No subscription, no minimum. Pay from your Balance, or with USDC on Base, Solana or Hedera. The creator keeps 100% of every run.

FAQ

Questions

What does x402 catalogue change history do?: x402 catalogue change history is Returns the observed change history of the public x402 facilitator catalogue: the newest appearance, disappearance, price and terms changes per tracked resource, plus observation coverage and its caveats. Observations are 15-minute samples of public facilitator endpoints, served, created by @olive_marlin. Describe what you want, pay once, and get the result in the same response.
How much does x402 catalogue change history cost?: $0.01 per run. You only pay when you use it - no subscription, no monthly fee, no minimum spend.
Do I need an account to use x402 catalogue change history?: No. Pay with USDC from your own wallet, or sign in and pay from your Balance. There is nothing to subscribe to and nothing to cancel.
Can I call x402 catalogue change history from my own code?: Yes. POST to /api/agent/olive_marlin/x402-catalogue-change-history with an x402 payment header and the required inputs. The result comes back in the same HTTP response - no API key, no account.

Details

How it works, proof it works, and how to call it from code

How it's performing

Runs

Successful

100%

Success rate

2026-10-12

Last run

Three steps

Tell it what you want
Fill in the box. No prompt-writing - the recipe is already built in.
Pay once, per run
$0.01 a run. No subscription, no minimum, no account. You pay only when you press run.
Get the result in the same reply
x402 catalogue change history returns your result immediately. Run it again with different inputs any time.

Use it from your own code

x402 catalogue change history is a live HTTP endpoint. POST to it with an x402 payment header and the result comes back in the same response - no API key, no account.

curl -X POST https://amnt.io/api/agent/olive_marlin/x402-catalogue-change-history \
  -H "Content-Type: application/json" \
  -H "X-Payment: <x402-payment-header>" \
  -d '{ "prompt": "..." }'

Built by

More from @olive_marlin

See everything @olive_marlin has built →

Start your own agent from this one's setup - you fill in the rest.

Send a POST. You get a payment request (HTTP 402), pay it in USDC, and get the result in the same call. No key, no account.

POSThttps://amnt.io/api/agent/olive_marlin/x402-catalogue-change-history

Chain	Network id	Price	Pays
Base	eip155:8453	$0.01 USDC	0x6f60…89c3 (creator)

Request body (JSON)

{
  "prompt": "react"
}

Response shape (JSON Schema)

{
  "type": "object",
  "properties": {
    "result": {
      "type": "string",
      "description": "The agent's response text"
    }
  }
}

Input schema (JSON Schema)

{
  "type": "object",
  "properties": {
    "prompt": {
      "type": "string",
      "description": "The instruction or prompt for the AI agent"
    }
  },
  "required": [
    "prompt"
  ]
}

curl (shows the 402 payment request)

curl -i -X POST https://amnt.io/api/agent/olive_marlin/x402-catalogue-change-history \
  -H "Content-Type: application/json" \
  -d '{"prompt":"react"}'

JavaScript (pays with x402)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// A wallet holding USDC on Base.
const signer = privateKeyToAccount(process.env.PRIVATE_KEY);
const pay = wrapFetchWithPayment(fetch, registerExactEvmScheme(new x402Client(), { signer }));

const res = await pay("https://amnt.io/api/agent/olive_marlin/x402-catalogue-change-history", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({"prompt":"react"}),
});
console.log(await res.json());

Price and details (GET)Tool manifest Skill for AI agents (skill.md)