AI Inference · x402 · early usage

Tell me what changed on this page since my last check (deterministic, no LLM)

by api.agentsouk.dev · discovered, not yet claimed by its owner · updated 2026-09-16

30d calls1

30d payers1

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tell me what changed on this page since my last check (deterministic, no LLM)

Tags: monitoring · diff · watch · change-detection · web · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-09-16

Input example from Bazaar metadata

{
  "ignore": [
    "\"generated_at\": \"*\""
  ],
  "label": "competitor pricing",
  "selector": "Price:",
  "url": "https://example.com/pricing"
}

Output example

{
  "changed": true,
  "checked_at": "2026-09-16T10:00:00.000Z",
  "checks": 14,
  "clipped": false,
  "content_chars": 21,
  "content_empty": false,
  "content_kind": "html",
  "diff": {
    "added": [
      "Price: 49 USD / month"
    ],
    "removed": [
      "Price: 39 USD / month"
    ],
    "reordered": false,
    "truncated": false
  },
  "error": null,
  "fetch_ok": true,
  "final_url": "https://example.com/pricing",
  "first_check": false,
  "hash": "82b3b492701ab51d18916f30e3e9402b3ce39785961d4c38bb421f4d5f863ab1",
  "http_status": 200,
  "label": "competitor pricing",
  "last_change_at": "2026-09-16T10:00:00.000Z",
  "previous_checked_at": "2026-09-16T09:00:00.000Z",
  "previous_hash": "1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b",
  "selector_matched": 1,
  "snippet": "Price: 49 USD / month",
  "url": "https://example.com/pricing"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/38450.json for the price and payment options.
Pay. Call GET https://api.agentsouk.dev/v1/x402/lst_01M2NXY883W33X7KJCZMJ811A0. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 1 calls · 1 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0xA0a2494006B72109137630bC026434a809731c07	900s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xA0a2494006B72109137630bC026434a809731c07",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 900
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "changed": {
          "description": "false on the first check of a target and whenever the target could not be read",
          "type": "boolean"
        },
        "checked_at": {
          "format": "date-time",
          "type": "string"
        },
        "checks": {
          "description": "how often you have checked this target",
          "type": "integer"
        },
        "clipped": {
          "description": "the page was longer than the 8,000 characters the diff can show; the hash still covers all of it",
          "type": "boolean"
        },
        "content_chars": {
          "type": "integer"
        },
        "content_empty": {
          "description": "nothing was left to compare - a maintenance page, or a selector that missed. The baseline is kept rather than replaced by emptiness",
          "type": "boolean"
        },
        "content_kind": {
          "description": "how the body is normalised; frozen at the first check of a target",
          "enum": [
            "html",
            "json",
            "text",
            null
          ],
          "type": [
            "string",
            "null"
          ]
        },
        "diff": {
          "description": "null when nothing changed or nothing could be read",
          "properties": {
            "added": {
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "removed": {
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "reordered": {
              "description": "the same lines in a different order or multiplicity: changed, but nothing to list",
              "type": "boolean"
            },
            "truncated": {
              "type": "boolean"
            }
          },
          "type": [
            "object",
            "null"
          ]
        },
        "error": {
          "description": "why the target could not be read",
          "type": [
            "string",
            "null"
          ]
        },
        "fetch_ok": {
          "description": "false when the target could not be read; the stored snapshot is then left as it was",
          "type": "boolean"
        },
        "final_url": {
          "type": [
            "string",
            "null"
          ]
        },
        "first_check": {
          "type": "boolean"
        },
        "hash": {
          "description": "sha256 of the whole normalised content, including what the diff had to leave out",
          "type": [
            "string",
            "null"
          ]
        },
        "http_status": {
          "type": [
            "integer",
            "null"
          ]
        },
        "label": {
          "type": [
            "string",
            "null"
          ]
        },
        "last_change_at": {
          "description": "when this target last differed, as far as your own checks have seen",
          "format": "date-time",
          "type": [
            "string",
            "null"
          ]
        },
        "previous_checked_at": {
          "format": "date-time",
          "type": [
            "string",
            "null"
          ]
        },
        "previous_hash": {
          "type": [
            "string",
            "null"
          ]
        },
        "selector_matched": {
          "description": "lines your selector kept; 0 means the watch is comparing nothing",
          "type": [
            "integer",
            "null"
          ]
        },
        "snippet": {
          "type": "string"
        },
        "url": {
          "type": "string"
        }
      },
      "required": [
        "changed",
        "first_check",
        "fetch_ok"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "changed": true,
    "checked_at": "2026-01-01T00:00:00Z",
    "checks": 0,
    "clipped": true,
    "content_chars": 0,
    "content_empty": true,
    "content_kind": "html",
    "diff": {
      "added": [
        "string"
      ],
      "removed": [
        "string"
      ],
      "reordered": true,
      "truncated": true
    },
    "error": "string",
    "fetch_ok": true,
    "final_url": "string",
    "first_check": true,
    "hash": "string",
    "http_status": 0,
    "label": "string",
    "last_change_at": "2026-01-01T00:00:00Z",
    "previous_checked_at": "2026-01-01T00:00:00Z",
    "previous_hash": "string",
    "selector_matched": 0,
    "snippet": "string",
    "url": "string"
  },
  "type": "string"
}

Examples

curl

curl -X POST 'https://api.agentsouk.dev/v1/x402/lst_01M2NXY883W33X7KJCZMJ811A0' -H 'Content-Type: application/json' --data '{"ignore":["\"generated_at\": \"*\""],"label":"competitor pricing","selector":"Price:","url":"https://example.com/pricing"}'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

const res = await fetch("https://api.agentsouk.dev/v1/x402/lst_01M2NXY883W33X7KJCZMJ811A0", {
  "method": "POST",
  "headers": {
    "content-type": "application/json"
  },
  "body": "{\"ignore\":[\"\\\"generated_at\\\": \\\"*\\\"\"],\"label\":\"competitor pricing\",\"selector\":\"Price:\",\"url\":\"https://example.com/pricing\"}"
});
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
import json
res = httpx.request("POST", "https://api.agentsouk.dev/v1/x402/lst_01M2NXY883W33X7KJCZMJ811A0", json=json.loads("{\"ignore\":[\"\\\"generated_at\\\": \\\"*\\\"\"],\"label\":\"competitor pricing\",\"selector\":\"Price:\",\"url\":\"https://example.com/pricing\"}"))
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: api.agentsouk.dev
Endpoint: https://api.agentsouk.dev/v1/x402/lst_01M2NXY883W33X7KJCZMJ811A0
Machine-readable: /resources/38450.json