# 400860 Data API – MCP Tool Call

> 400860 Data API – MCP Tool Call is a paid API for AI agents from api.400860.xyz, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Executes a named tool via MCP call to retrieve DeFi yields, protocol TVL, AI model pricing, or scraped web data, paid per-call via x402 micropayments.

## Facts

- Endpoint: POST https://api.400860.xyz/v1/mcp/call
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/400860-data-api-mcp-tool-call-4d9727bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BdJwo3RJWUbzrvO9vsA5Z

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability 400860-data-api-mcp-tool-call-4d9727bf -d '<json body>'
```

Example prompt: Call the 400860 Data API with the 'defi_yields' tool and no extra params to fetch current DeFi stablecoin yield opportunities — I want to see what's available across protocols right now.

## When to prefer this

Choose this endpoint when you need micropayment-gated, agent-friendly access to DeFi yield data, protocol TVL, AI model pricing, or web scraping in a single MCP-style call. It is ideal for AI agents operating in Web3 contexts that already support x402 payment flows, and where per-call USDC pricing is preferable to subscription-based data APIs. Prefer alternatives if you need free data, traditional REST APIs without payment headers, or deeply historical on-chain data.

## Known failure modes

- Invalid or unknown tool name returns an error object
- Missing required params for a specific tool causes a tool-level error
- Payment failure (x402) if USDC balance is insufficient — call is not executed
- Tool timeout if upstream data source is unavailable
- Malformed params object causes a validation error

## How this service works

x402-native paid API tools for DeFi yields, protocol TVL, AI pricing, paid MCP calls, and web scraping.

## Output

Returns a JSON object with the tool's output — e.g. a list of DeFi yield opportunities with APY and protocol details, TVL figures for one or more protocols, AI model cost-per-token comparisons, or scraped webpage content. Response structure varies by tool called.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "tool"
 ],
 "properties": {
  "tool": {
   "enum": [
    "get_defi_yields",
    "get_defi_tvl",
    "get_ai_pricing"
   ],
   "type": "string"
  },
  "params": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/400860-data-api-mcp-tool-call-4d9727bf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.400860.xyz](https://www.zero.xyz/host/api.400860.xyz/llms.txt)