# Stablecoin Monitor — Supply, Price & Peg Deviation

> Stablecoin Monitor — Supply, Price & Peg Deviation is a paid API for AI agents from stablecoins.x402utils.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).

Returns real-time supply, price, and peg deviation data for tracked stablecoins, plus a de-peg alert list, paid per call via x402.

## Facts

- Endpoint: GET https://stablecoins.x402utils.workers.dev/v1/top?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stablecoin-monitor-supply-price-peg-deviation-b4d3c14f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FG_3xX-J_iGRuz04gsWFE

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 stablecoin-monitor-supply-price-peg-deviation-b4d3c14f
```

Example prompt: Show me the top 50 stablecoins right now — I want to see their circulating supply, current price, peg deviation, and whether any are flagged as de-pegged.

## When to prefer this

Choose this endpoint when you need real-time stablecoin supply, price, and peg deviation data in a single call, especially when you want a de-peg alert list included. Prefer this over general crypto market APIs when stablecoin-specific monitoring and peg health are the primary concern, and when you are operating in a pay-per-call agent context using x402 micropayments on Base.

## Known failure modes

- Payment not provided or invalid x402 USDC payment on Base — returns 402 Payment Required
- Invalid 'top' parameter value (outside 1-100 range) — may return 400 Bad Request
- Upstream data source unavailable — may return 503 or stale data
- Rate limiting if payment is not properly processed

## How this service works

Stablecoin monitor for agents: supply, price and peg deviation for every tracked stablecoin, plus a de-peg alert list. Paid per call via x402 (USDC on Base).

## Output

A JSON object containing an array of stablecoin records (each with symbol, circulating supply, price, and peg deviation) along with a de-peg alert list and the total circulating USD value across all tracked stablecoins.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "top": {
       "type": "string",
       "description": "how many (1-100)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "stablecoins": [
   {
    "symbol": "USDT"
   }
  ],
  "total_circulating_usd": 300000000000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stablecoin-monitor-supply-price-peg-deviation-b4d3c14f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stablecoins.x402utils.workers.dev](https://www.zero.xyz/host/stablecoins.x402utils.workers.dev/llms.txt)