DeFi Yield Finder API

Best DeFi yields ranked by APY -- lending, staking, LP across 100+ protocols. Powered by DeFiLlama. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "defi-yields": {
      "url": "https://defi-yields.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://defi-yields.api.klymax402.com/api/yields?token=..."
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
defi_find_best_yields	GET	/api/yields	$0.005	Find best DeFi yield opportunities for a token
defi_find_best_yields	POST	/api/yields	$0.005	Find best DeFi yield opportunities for a token (POST variant)

defi_find_best_yields

Use this when you need to find the best DeFi yields for a token across all chains and protocols. Returns ranked opportunities in JSON.

Parameters

Name	Type	Required	Description
token	string	yes	Token symbol to find yields for (e.g. USDC, ETH, WBTC)
chain	string	no	Filter by chain (e.g. base, ethereum, arbitrum, polygon). Optional — returns all chains if omitted.
minTvl	number	no	Minimum TVL in USD to filter pools (default: 100000)
limit	number	no	Number of results to return (default: 10, max: 50)

Returns

• pool -- pool/vault name and pair
• protocol -- protocol name (Aave, Compound, Lido, Aerodrome, etc.)
• chain -- which blockchain network
• apy -- current annual percentage yield
• tvl -- total value locked in USD
• riskLevel -- risk assessment (low/medium/high)
• type -- yield type (lending, staking, LP, vault)

Example response:

{"pools":[{"pool":"USDC Lending","protocol":"Aave V3","chain":"base","apy":4.82,"tvl":125000000,"riskLevel":"low","type":"lending"}],"token":"USDC","totalPools":15}

When to use: deploying idle capital to find the highest safe yield. Essential for yield optimization and DeFi strategy comparison.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio), liquidation risk (use defi_get_liquidation_levels).

defi_find_best_yields

Use this when you need to find the best DeFi yields for a token across all chains and protocols. Returns ranked opportunities in JSON. POST variant of defi_find_best_yields -- same params passed as JSON body instead of query string.

Parameters

Name	Type	Required	Description
token	string	yes	Token symbol to find yields for (e.g. USDC, ETH, WBTC)
chain	string	no	Filter by chain (e.g. base, ethereum, arbitrum, polygon). Optional — returns all chains if omitted.
minTvl	number	no	Minimum TVL in USD to filter pools (default: 100000)
limit	number	no	Number of results to return (default: 10, max: 50)

Returns

• pool -- pool/vault name and pair
• protocol -- protocol name (Aave, Compound, Lido, Aerodrome, etc.)
• chain -- which blockchain network
• apy -- current annual percentage yield
• tvl -- total value locked in USD
• riskLevel -- risk assessment (low/medium/high)
• type -- yield type (lending, staking, LP, vault)

Example response:

{"pools":[{"pool":"USDC Lending","protocol":"Aave V3","chain":"base","apy":4.82,"tvl":125000000,"riskLevel":"low","type":"lending"}],"token":"USDC","totalPools":15}

When to use: deploying idle capital to find the highest safe yield. Essential for yield optimization and DeFi strategy comparison.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio), liquidation risk (use defi_get_liquidation_levels).

Example agent prompts

• "Find the best DeFi yields for a token across all chains and protocols"
• "Find the best DeFi yields for a token across all chains and protocols"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)
• Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT