Stablecoin supply history

Daily total stablecoin circulating supply (in USD) over time from DefiLlama's free stablecoin charts, for all chains or one chain (Ethereum, Tron, Solana, Base...): most recent `days` points (default 90, max 3650) for a peg currency (USD default; EUR, JPY, ... or all pegs summed), with a summary (latest, first, min, max, mean, change over the window). Send POST /api/stablecoin-supply-history with no required fields (3 optional) and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with source, fetchedAt, chain, peg, totalPoints and 3 more.

Unknown chains answer 422. Keyless public data.

Category: Crypto & onchain data · Tags: crypto stablecoin supply history defillama timeseries usd

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/stablecoin-supply-history \
  -H "Content-Type: application/json" \
  -d '{"chain":"all","days":7}'

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

Example response

{
  "source": "defillama-stablecoins",
  "fetchedAt": "2026-08-22T12:00:00.000Z",
  "chain": "all",
  "peg": "USD",
  "totalPoints": 3189,
  "count": 2,
  "summary": {
    "latest": 308487484274,
    "first": 307734935324,
    "min": 307734935324,
    "max": 308487484274,
    "mean": 308111209799,
    "changePct": 0.24
  },
  "points": [
    {
      "date": "2026-08-21",
      "circulatingUsd": 307734935324
    },
    {
      "date": "2026-08-22",
      "circulatingUsd": 308487484274
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "stablecoin-supply-history",
  "params": {
    "chain": "all",
    "days": 7
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for stablecoin-supply-history; 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/stablecoin-supply-history 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/stablecoin-supply-history", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "chain": "all",
    "days": 7
  }),
});

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