# Agent Tollgate Engine – Stablecoin Market Data

> Agent Tollgate Engine – Stablecoin Market Data is a paid API for AI agents from skinwinking.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Returns current price, circulating supply, and peg deviation data for major stablecoins

## Facts

- Endpoint: GET https://skinwinking.com/api/v1/data/stablecoins?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-tollgate-engine-stablecoin-market-data-8c4c05c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YGO45zI65c0vutxoka5-P

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 agent-tollgate-engine-stablecoin-market-data-8c4c05c7
```

Example prompt: Pull the latest stablecoin data — prices, circulating supply, and peg deviation in basis points — for the top 10 stablecoins right now.

## When to prefer this

Use this endpoint when you need real-time stablecoin price and peg health data across multiple stablecoins in a single call. Prefer it over general crypto price APIs when peg deviation (in basis points) is specifically needed. It is pay-per-call at $0.002 USDC via x402, making it cost-effective for infrequent or agent-driven lookups without a subscription commitment.

## Known failure modes

- Invalid limit value (outside 1–50 range) returns a validation error
- Payment not settled via x402 results in 402 Payment Required response
- Upstream data source unavailable may return 503 or empty dataset
- Exceeding the maximum limit of 50 returns a schema validation error

## How this service works

50 pay-per-call tools for agents over x402 (USDC on Base, Polygon, Solana): crypto market data, token audits, indicators, swap routing, web extraction, DNS/WHOIS/email checks, FX, weather and AI text/image tools.

## Output

A JSON array of stablecoin objects each containing: symbol (e.g. USDT), current price in USD, circulating supply in USD, and peg deviation in basis points (negative = below peg, positive = above peg).

## 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": {
      "limit": {
       "type": "integer",
       "default": 15,
       "maximum": 50,
       "minimum": 1
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "stablecoins": [
   {
    "price": 0.9989,
    "symbol": "USDT",
    "circulatingUsd": 182000000000,
    "pegDeviationBps": -11
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-tollgate-engine-stablecoin-market-data-8c4c05c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from skinwinking.com](https://www.zero.xyz/host/skinwinking.com/llms.txt)