SouthPow API

buy_yields_protocol_usual-usd0

Paid. Live DeFi yields for usual-usd0: its pools across chains with APY, TVL, 7d APY change (DefiLlama data). $0.005 USDC on Base or Solana. No account, no API key. Failed calls not charged. URL https://southpow.media/v1/yields/protocol/usual-usd0.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "buy_yields_protocol_usual-usd0"
  }
}

Input Schema

Name	Required	Description
`sort`	No	tvl (default) or apy
`limit`	No	Rows, 1-100 (default 20)
`min_tvl_usd`	No	Minimum pool TVL in USD (default 100000)

Schema Changelog

Changes observed during successful MCP inspections.

AddedNov 4, 2026

TDQS

A3.7/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden and does well: it discloses price ($0.005 USDC), payment chains (Base or Solana), no account or API key required, that failed calls are not charged, and the DefiLlama data source. Missing only response-shape detail, which is partly covered by the listed APY/TVL/7d-change fields.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with 'Paid.' and then the purpose, followed by short payment and provenance sentences. Efficient overall, with only minor redundancy between the cost sentence and the appended URL.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema exists, so the description usefully names the returned fields (APY, TVL, 7d APY change). Combined with payment terms and data source, an agent has enough to decide and call correctly; only cross-sibling routing guidance is thin.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and documents sort, limit and min_tvl_usd with defaults. The description adds no semantic detail about these parameters, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource: live DeFi yields for the protocol usual-usd0, with pools across chains carrying APY, TVL and 7d APY change. That distinguishes it from buy_yields_chain_* and buy_yields_token_* siblings by scope, though the description never explicitly contrasts those scopes.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The protocol-level framing implies when to pick this over chain- or token-level siblings, but there is no explicit when-to-use or when-not-to-use statement. An agent must infer the routing from the name and the 'its pools' phrasing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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