# DAO Proposal State Change Checker

> DAO Proposal State Change Checker is a paid API for AI agents from api402x.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Cheaply polls whether a DAO governance proposal's on-chain state has changed since the last check, and tells you when it's safe to stop polling.

## Facts

- Endpoint: GET https://api402x.com/proposal-state-check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dao-proposal-state-change-checker-2f174bac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uhrJwks0iiaekV01TYfzV

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 dao-proposal-state-change-checker-2f174bac
```

Example prompt: Check if the Compound DAO proposal 123 has changed state since it was last in 'Active' — just a quick poll, not the full details.

## When to prefer this

Use this endpoint when you need to efficiently monitor a DAO proposal over time without paying for full proposal detail reads on every poll cycle. It costs a single contract read ($0.002 USDC) versus the heavier GET /proposal-status, making it ideal for high-frequency polling loops. Once this endpoint reports terminal=true, it explicitly tells you to stop polling, preventing unnecessary spend. Switch to GET /proposal-status only when this endpoint reports a change and you need the full state details, execution_eta, and contextual interpretation.

## Known failure modes

- Unknown or unsupported DAO name returns an error
- Invalid or non-existent proposal_id returns an error
- Network/RPC issues reading the Governor contract may cause transient failures
- Passing a malformed state string may cause unexpected comparison results
- Payment failure (x402) blocks the request before any chain read occurs

## How this service works

Cheap poll: has this proposal's state changed since you last looked? You pass the state this route or GET /proposal-status gave you last time; it reads the Governor's current state and compares. Call it with no state to get a baseline. One contract read, which is why it is cheap; when it reports changed, buy GET /proposal-status for the new state, its execution_eta and what that means on this contract family. Terminal states (executed, defeated, canceled, expired) never change again -- the response says so explicitly and tells you to stop polling, because charging for a poll that can only ever answer 'unchanged' would be selling nothing. Required: dao and proposal_id. Optional: state.

## Output

Returns a JSON object with: dao name, proposal_id, a status field (baseline, unchanged, or changed), the current on-chain state string, a terminal boolean indicating whether this state can ever change again (and if true, advice to stop polling), a checked_at ISO timestamp, an optional next field with recommended action, and an optional detail message with human-readable context.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "dao",
      "proposal_id"
     ],
     "properties": {
      "dao": {
       "type": "string",
       "description": "REQUIRED. DAO name from the supported list."
      },
      "state": {
       "type": "string",
       "description": "OPTIONAL. The state this route returned last time. Omit to get a baseline."
      },
      "proposal_id": {
       "type": "string",
       "description": "REQUIRED. Decimal proposal id from that DAO's Governor."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "dao",
      "proposal_id",
      "status",
      "state",
      "terminal",
      "checked_at"
     ],
     "properties": {
      "dao": {
       "type": "string"
      },
      "next": {
       "type": [
        "string",
        "null"
       ]
      },
      "state": {
       "type": "string"
      },
      "detail": {
       "type": [
        "string",
        "null"
       ]
      },
      "status": {
       "enum": [
        "baseline",
        "unchanged",
        "changed"
       ],
       "type": "string"
      },
      "terminal": {
       "type": "boolean"
      },
      "presented": {
       "type": [
        "string",
        "null"
       ]
      },
      "checked_at": {
       "type": "string",
       "format": "date-time"
      },
      "proposal_id": {
       "type": "string"
      }
     },
     "additionalProperties": false
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dao-proposal-state-change-checker-2f174bac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api402x.com](https://www.zero.xyz/host/api402x.com/llms.txt)