# Changelog State API – Structured Recent Releases for a Tracked Vendor

> Changelog State API – Structured Recent Releases for a Tracked Vendor is a paid API for AI agents from changelog-state-api.replit.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Returns paginated, structured recent release entries for a single monitored vendor (identified by slug), including version, date, and changelog details.

## Facts

- Endpoint: GET https://changelog-state-api.replit.app/api/monitors/x402?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/changelog-state-api-structured-recent-releases-for-a-tracked-vendor-841adfc9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oWkBpumpU_33id16gNhbm

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability changelog-state-api-structured-recent-releases-for-a-tracked-vendor-841adfc9
```

Example prompt: Pull the 10 most recent structured release entries for the OpenAI vendor from the Changelog State API so I can see what they've shipped lately.

## When to prefer this

Use this endpoint when you need structured, paginated release data for a specific vendor that is already tracked by the Changelog State API monitor list. It is ideal for agents that need to programmatically inspect recent software releases, compare versions, or feed changelog data into downstream workflows. Prefer this over generic web scraping when the vendor is in the tracked set and you need clean, structured output rather than raw HTML.

## Known failure modes

- Passing the literal string '{slug}' or an unresolved path parameter returns 404
- A malformed or cross-vendor cursor returns 400 and is not charged
- An unrecognized vendor slug returns 404
- Requesting limit outside 1–50 returns a validation error
- Service unavailability on the Replit host returns 5xx

## How this service works

Structured recent releases for one tracked vendor.

## Output

A JSON object containing a list of structured release entries for the requested vendor (each with version, publish date, and changelog details), plus an opaque nextCursor token for pagination to older entries.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "slug"
     ],
     "properties": {
      "slug": {
       "type": "string",
       "example": "openai",
       "pattern": "^[a-z0-9][a-z0-9-]*$",
       "maxLength": 64,
       "minLength": 1,
       "description": "Vendor slug, lowercase alphanumeric with dashes. Take one from GET /api/monitors and substitute it into the path: `{slug}` is a placeholder, and requesting those literal characters returns 404. Worked example: GET /api/monitors/openai."
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "default": 5,
       "maximum": 50,
       "minimum": 1,
       "description": "Maximum number of release entries to return on this page. The page size, not a total: use `cursor` to walk past it."
      },
      "cursor": {
       "type": "string",
       "default": "",
       "maxLength": 512,
       "description": "Opaque next-page token, copied verbatim from `nextCursor` on the previous response for this same vendor. Omit it — or send the empty string — to start at the newest entry. It names a position in the newest-first order rather than an offset, so a page you have already read never shifts under you: an entry that arrives mid-walk takes the place its own publish date gives it — above the cursor, on ground you have already covered, or below it, still ahead of you — instead of renumbering every page behind it. It does not expire; a walk can be paused and resumed. Do not construct or edit one: a token that is malformed, or was issued for a different vendor, is refused with 400 and is never charged."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "enum": [
      "json"
     ],
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   },
   "description": "Full structured recent releases (paid)"
  }
 },
 "description": "Call shape for GET /api/monitors/{slug}."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/changelog-state-api-structured-recent-releases-for-a-tracked-vendor-841adfc9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from changelog-state-api.replit.app](https://www.zero.xyz/host/changelog-state-api.replit.app/llms.txt)