# HALOWERK marktwerk Stablecoin Peg Monitor

> HALOWERK marktwerk Stablecoin Peg Monitor is a paid API for AI agents from markt.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Quotes stablecoins against real USD on Kraken and Coinbase and against USDT on Binance/OKX/Bybit, computing median price and deviation in basis points to assess peg health and cross-venue agreement.

## Facts

- Endpoint: POST https://markt.halowerk.com/peg
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-marktwerk-stablecoin-peg-monitor-e9912764
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x-PwQLt42sPo5D-onbD0E

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 halowerk-marktwerk-stablecoin-peg-monitor-e9912764 -d '<json body>'
```

Example prompt: Check the dollar peg health for USDC, USDT, and DAI across Coinbase, Kraken, Binance, OKX, and Bybit — give me the median price and deviation in basis points for each, using a peg band of 50 bps, and tell me whether any deviation looks like a venue-specific glitch or a systemic depeg.

## When to prefer this

Choose this endpoint when you need authoritative dollar-anchored stablecoin peg health, not just a price quote. It is specifically designed to separate true USD quotes (Kraken, Coinbase) from USDT cross-quotes (Binance, OKX, Bybit), making the median and deviation metrics meaningful for depeg detection. Prefer this over generic ticker endpoints when you need cross-venue agreement analysis to distinguish venue-local anomalies from systemic depegs.

## Known failure modes

- Requested venue is unreachable or returns stale data — that venue's quote may be omitted or flagged
- Unknown stablecoin ticker provided — returns error or no data for that symbol
- All venues fail simultaneously — median_price and deviation_bps cannot be computed
- peg_band_bps out of allowed range (1–500) — returns validation error
- minItems/maxItems violations on venues or stablecoins arrays — schema validation error

## How this service works

Quotes each stablecoin against real US dollars on Kraken and Coinbase and, separately, against USDT on Binance, OKX and Bybit. Only the dollar quotes enter median_price and deviation_bps, because a USDT quote measures two stablecoins against each other and not the dollar; those are reported apart and labelled. Deviation is always in basis points against 1.00, never in percent. agreement is the point of the whole endpoint: a deviation at a single venue is a venue problem, a deviation everywhere i

## Output

Returns per-stablecoin data including median price computed from USD-quoted venues (Kraken, Coinbase), deviation from $1.00 in basis points, per-venue USD quotes, separately labelled USDT-quoted prices from Binance/OKX/Bybit, an agreement signal indicating whether deviations are venue-specific or systemic, and depth-at-peg metrics computed using the requested peg band.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "venues": {
   "type": "array",
   "items": {
    "enum": [
     "binance",
     "coinbase",
     "kraken",
     "okx",
     "bybit"
    ],
    "type": "string"
   },
   "maxItems": 5,
   "minItems": 1,
   "description": "Exchanges to use. Without it all connected ones are used.",
   "uniqueItems": true
  },
  "stablecoins": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^[A-Za-z0-9]{2,10}$"
   },
   "default": [
    "USDC",
    "USDT",
    "DAI"
   ],
   "maxItems": 6,
   "minItems": 1,
   "description": "Stablecoin tickers, for example USDC, USDT, DAI, PYUSD, USDG, RLUSD.",
   "uniqueItems": true
  },
  "peg_band_bps": {
   "type": "number",
   "default": 50,
   "maximum": 500,
   "minimum": 1,
   "description": "Half width of the peg band in basis points, used for depth_at_peg."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-marktwerk-stablecoin-peg-monitor-e9912764/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from markt.halowerk.com](https://www.zero.xyz/host/markt.halowerk.com/llms.txt)