DeFi protocol TVL

Look up the current Total Value Locked (TVL) for a DeFi protocol via DeFiLlama's public API. Send POST /api/defi-tvl with the required field protocol and pay $0.001 per call over x402 or MPP (there is no free tier). It returns a JSON object with protocol, name, category, tvlUsd, change24h and 3 more.

Identify the protocol by its DeFiLlama slug (uniswap, aave, lido, ethena, etc.). Returns the total TVL plus per-chain breakdown and 24h/7d/30d change where DeFiLlama exposes it.

Category: Crypto & onchain data · Tags: crypto defi tvl defillama protocol

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/defi-tvl \
  -H "Content-Type: application/json" \
  -d '{"protocol":"aave"}'

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

Example response

{
  "protocol": "aave",
  "name": "AAVE",
  "category": "Lending",
  "tvlUsd": 15000000000,
  "change24h": 0.5,
  "change7d": 2.1,
  "change30d": 8,
  "chainTvls": [
    {
      "chain": "Ethereum",
      "tvlUsd": 11000000000
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "defi-tvl",
  "params": {
    "protocol": "aave"
  }
}

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

Errors and behavior

• protocol is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• 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 issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/defi-tvl 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/defi-tvl", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "protocol": "aave"
  }),
});

Part of these workflows

DeFi protocol TVL is one step in these 2 skill packs, each sold as a single call:

• DeFi protocol scanner - Due-diligence a DeFi protocol in one workflow: live token price, market context, protocol TVL across chains, and recent news - the on-chain and off-chain picture together.
• DeFi dashboard - DeFi market overview: total TVL, ETH price, Base gas, and global crypto stats in one call.

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