# Stablecoin Market Overview API

> Stablecoin Market Overview API is a paid API for AI agents from crypto.openverbs.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the total circulating stablecoin market cap in USD plus a ranked list of the largest stablecoins with their peg type, peg mechanism, and dominance share.

## Facts

- Endpoint: POST https://crypto.openverbs.com/v1/stablecoins
- 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/stablecoin-market-overview-api-4a44c585
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5WxG_cmrIiEQuA8qhTHlq

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-market-overview-api-4a44c585 -d '<json body>'
```

Example prompt: Give me an overview of the stablecoin market — show me the top 15 stablecoins by market cap, along with the total circulating market cap and each coin's peg type and mechanism.

## When to prefer this

Choose this endpoint when you need a comprehensive stablecoin market snapshot — total market cap plus ranked leaders with peg classification — in a single call. Prefer it over general crypto price endpoints when the specific focus is stablecoin composition, dominance, and peg mechanism analysis rather than individual token prices.

## Known failure modes

- Invalid limit value (outside 1–100 range) returns a validation error
- Payment failure or insufficient USDC balance returns a 402 Payment Required error
- Upstream data source unavailability may return a 503 or empty dataset
- Malformed request body returns a 400 Bad Request

## How this service works

Stablecoin market: total circulating market cap (USD) and the largest stablecoins by mcap with their peg type, peg mechanism (e.g. fiat-backed, crypto-backed) and dominance.

## Output

Returns the total circulating stablecoin market cap in USD, plus a ranked list of stablecoins (up to the requested limit, default 10) each with: name, peg type (e.g. fiat, crypto, algorithmic), peg mechanism (e.g. fiat-backed, crypto-backed), market cap in USD, and dominance as a percentage of total stablecoin market cap.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 100,
       "minimum": 1,
       "description": "How many stablecoins to return, ranked by market cap (default 10)."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 421,
  "stale": false,
  "source": "defillama",
  "stablecoins": [
   {
    "name": "Tether",
    "symbol": "USDT",
    "mcapUsd": 183359001413.3,
    "pegType": "peggedUSD",
    "dominancePct": 58.5,
    "pegMechanism": "fiat-backed"
   }
  ],
  "totalMcapUsd": 313413823122.79
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stablecoin-market-overview-api-4a44c585/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from crypto.openverbs.com](https://www.zero.xyz/host/crypto.openverbs.com/llms.txt)