# 2s.io Stablecoin Supply Leaderboard

> 2s.io Stablecoin Supply Leaderboard is a paid API for AI agents from 2s.io, paid per call via x402, $0.0036/call, status unknown (last checked 2026-09-14).

Returns a ranked list of the largest stablecoins by circulating USD supply, including peg type, peg mechanism, and current price, sourced via DefiLlama.

## Facts

- Endpoint: GET https://2s.io/api/crypto/stablecoins
- Price: $0.0036/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/2s-io-stablecoin-supply-leaderboard-d25b42c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JaLTMxNJlJC_PTuv7d0lK

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 2s-io-stablecoin-supply-leaderboard-d25b42c7
```

Example prompt: Pull the top 50 stablecoins ranked by circulating supply and tell me their peg types and mechanisms — I want to see which ones are fiat-backed vs algorithmic and check if any are currently off their peg.

## When to prefer this

Use this endpoint when you need a ranked leaderboard of stablecoins by circulating supply with peg type and mechanism metadata, especially for DeFi market analysis, de-peg risk monitoring, or comparing fiat-backed vs algorithmic stablecoins. Prefer this over generic crypto price APIs when stablecoin-specific metadata (peg mechanism, peg currency) is required.

## Known failure modes

- Payment required (402) if x402 micropayment header is missing or insufficient
- limit parameter out of range (must be 1–200) returns validation error
- Upstream DefiLlama data unavailable may cause 503 or stale data
- No results returned if stablecoin data feed is temporarily empty

## How this service works

Stablecoin supply leaderboard (via DefiLlama, free/keyless): the largest stablecoins by circulating USD, with peg type (USD/EUR/…), peg mechanism (fiat-backed, crypto-backed, algorithmic), and current price. For tracking stablecoin market share and de-peg risk.

## Output

A ranked list of stablecoins (up to the requested limit, max 200) ordered by circulating USD supply, each with its name, circulating supply in USD, peg currency (e.g. USD, EUR), peg mechanism (fiat-backed, crypto-backed, algorithmic), and current price. Useful for market share analysis and de-peg risk monitoring.

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 200,
       "minimum": 1
      }
     },
     "additionalProperties": false
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/2s-io-stablecoin-supply-leaderboard-d25b42c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 2s.io](https://www.zero.xyz/host/2s.io/llms.txt)