Stablecoin supply by asset

Stablecoins ranked by circulating supply from DefiLlama's free stablecoin dataset: name, symbol, peg currency and type (USD, EUR, JPY, VAR...), peg mechanism (fiat-backed, crypto-backed, algorithmic), current price and USD peg deviation, circulating supply in peg units and USD, 1d/7d/30d supply change, and per-chain circulation (top chains + count). Send POST /api/stablecoins with no required fields (5 optional) and pay $0.003 per call over x402 or MPP (there is no free tier). It returns a JSON object with source, fetchedAt, cached, filters, totals and 3 more.

Filter by peg currency, mechanism, chain (then ranked by supply on that chain) or a name/symbol search; limit up to 100. Totals carry matched circulating USD. Keyless public data.

Category: Crypto & onchain data · Tags: crypto stablecoin supply circulating usdt usdc defillama peg · Also found as: stablecoin-supply-by-asset stablecoin-supply

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/stablecoins \
  -H "Content-Type: application/json" \
  -d '{"peg":"USD","limit":5}'

Without payment this returns HTTP 402 Payment Required with the exact price for stablecoins; any x402 v2 or MPP client pays it and retries.

Example response

{
  "source": "defillama-stablecoins",
  "fetchedAt": "2026-08-22T12:00:00.000Z",
  "cached": true,
  "filters": {
    "peg": "USD",
    "mechanism": null,
    "chain": null,
    "search": null
  },
  "totals": {
    "circulatingUsd": 307000000000,
    "assetCount": 300
  },
  "matched": 300,
  "count": 1,
  "stablecoins": [
    {
      "rank": 1,
      "id": "1",
      "name": "Tether",
      "symbol": "USDT",
      "geckoId": "tether",
      "pegType": "peggedUSD",
      "pegCurrency": "USD",
      "pegMechanism": "fiat-backed",
      "price": 0.9998,
      "pegDeviationPct": -0.02,
      "circulating": 183181226868,
      "circulatingUsd": 183181226868,
      "change1dPct": 0.08,
      "change7dPct": 0.01,
      "change30dPct": 0.01,
      "chainCount": 120,
      "chains": [
        {
          "chain": "Tron",
          "circulating": 90000000000
        }
      ]
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "stablecoins",
  "params": {
    "peg": "USD",
    "limit": 5
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for stablecoins; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• Every field is optional. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/stablecoins returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/stablecoins", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "peg": "USD",
    "limit": 5
  }),
});

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