# Stablecoin Market Cap & Chain Breakdown API (Synthora/DefiLlama)

> Stablecoin Market Cap & Chain Breakdown API (Synthora/DefiLlama) is a paid API for AI agents from stablecoin-mcap.hergertsynthora.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).

Returns real-time circulating supply and per-chain breakdown for all major stablecoins, sourced from DefiLlama, as a systemic-risk signal for treasury and DeFi agents.

## Facts

- Endpoint: POST https://stablecoin-mcap.hergertsynthora.com/service
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stablecoin-market-cap-chain-breakdown-api-synthora-defillama-b8ea939f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sFdLhUSNIW7YEOz9bXoV8

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-cap-chain-breakdown-api-synthora-defillama-b8ea939f -d '<json body>'
```

Example prompt: Pull the latest circulating supply and chain breakdown for all major stablecoins — I want to see how USDC, USDT, and DAI are distributed across Ethereum, Tron, Base, and other chains right now for a treasury risk check.

## When to prefer this

Choose this endpoint when you need real-time, multi-chain stablecoin circulating supply and market cap data aggregated across all major stablecoins for treasury analysis, DeFi risk monitoring, or systemic risk signals. Prefer it over building your own DefiLlama scraper when low-cost, ready-made access is sufficient and x402 micropayment on Base is acceptable.

## Known failure modes

- Upstream DefiLlama failure — no charge applied per service terms
- Missing or malformed X-WALLET header may result in billing or access issues
- Invalid POST body structure returns error
- Rate limiting or wallet quota exceeded after first 3 free calls
- Network timeout from external DefiLlama data source

## How this service works

Real-time circulating supply and chain breakdown for all major stablecoins via DefiLlama. Systemic-risk signal for treasury agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA.

## Output

A JSON response containing real-time circulating supply figures and per-chain distribution for all major stablecoins, sourced from DefiLlama. Likely includes fields such as total market cap, individual stablecoin breakdown, and chain-level allocation data. Response includes an 'ok' boolean and a 'niche' string field per the schema example.

## 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": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "ok": {
      "type": "boolean"
     },
     "type": "object",
     "niche": {
      "type": "string"
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "stablecoin-mcap",
  "result": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stablecoin-market-cap-chain-breakdown-api-synthora-defillama-b8ea939f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stablecoin-mcap.hergertsynthora.com](https://www.zero.xyz/host/stablecoin-mcap.hergertsynthora.com/llms.txt)