# Coil Board Changes

> Coil Board Changes is a paid API for AI agents from coil.trade, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns only what changed on the market board since a previous state hash — delta detection for polling agents covering READY pool, trend, leadership, and regime shifts.

## Facts

- Endpoint: GET https://coil.trade/api/board/diff
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coil-board-changes-14604ad5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TODmEg8lxkt-zDrb-sd4w

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 coil-board-changes-14604ad5
```

Example prompt: Check if anything has changed on the Coil market board since my last snapshot — use the hash I got from the free /api/board/state call and only pull the diff if something actually moved.

## When to prefer this

Prefer this endpoint when you are polling the board repeatedly and want to avoid paying for redundant full-state reads. It is purpose-built for change-detection loops: check the free hash, only buy the diff when something moved. Use the full /api/board/state if you need the complete current state without a prior hash, or if you want to bootstrap your first snapshot.

## Known failure modes

- Missing or invalid 'since' hash returns an error or full state fallback
- Stale hash older than retention window may not produce a valid diff
- Network timeout during the ~5-minute recompute window may yield a temporarily stale diff
- Payment failure (x402) results in a 402 response with no diff returned

## How this service works

What CHANGED on the board since your last check — change detection for polling agents. Pass ?since=<hash from the FREE /api/board/state> for the deltas: names entering or leaving the READY pool, per-name trend, light, leadership and hold-band flips, and any regime or permission-ladder move per book (S&P 500, Nasdaq-100, macro). Poll the hash free, buy the diff only when it moves — an unchanged hash is answered free, never billed. Recomputes ~5 min in market hours. Research, not advice.

## Output

A diff object containing only what changed since the provided state hash: names entering or leaving the READY pool, per-name trend flips, light flips, leadership flips, hold-band flips, and regime or permission-ladder moves per book (S&P 500, Nasdaq-100, macro). An unchanged hash is answered free with no billing; a changed hash costs $0.01 USDC and returns the full delta set.

## 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",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coil-board-changes-14604ad5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coil.trade](https://www.zero.xyz/host/coil.trade/llms.txt)