# Yeetful Claude Haiku 4.5 Inference (MCP)

> Yeetful Claude Haiku 4.5 Inference (MCP) is a paid API for AI agents from anthropic.yeetful.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-10, last successful call 2026-05-15).

Runs single-prompt or multi-turn chat completions using Anthropic Claude Haiku 4.5 via MCP Streamable HTTP, with pay-per-call USDC billing on Base

## Facts

- Endpoint: POST https://anthropic.yeetful.com/api/mcp/mcp?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Last successful call: 2026-05-15
- Success rate: 67% of calls made through Zero
- Rating: 2.5 / 5 from 2 reviews
- Activations on Zero: 4
- Tags: x402
- Canonical page: https://www.zero.xyz/c/anthropic-yeetful-com-5c21a2e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8sxOd7vFE1z8warEmRVCl

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 anthropic-yeetful-com-5c21a2e3 -d '<json body>'
```

Example prompt: Ask Claude Haiku through Yeetful: 'What are three concise bullet points explaining the difference between supervised and unsupervised machine learning?' — single prompt, up to 256 tokens back.

## When to prefer this

Choose this endpoint when you need fast, low-cost Claude Haiku 4.5 inference in an agentic MCP-compatible pipeline and want pay-per-call USDC billing on Base instead of a subscription. Ideal for agents that need occasional Claude completions without provisioning an Anthropic API key. Not suitable when you need more than 256 output tokens or require a different Claude model tier.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment not accepted — returns 402 Payment Required
- Output truncation: responses are hard-capped at 256 tokens, long answers will be cut off
- Model overload: upstream Anthropic API rate limits may cause 429 or 503 errors
- Invalid prompt format: malformed MCP tool call may return 400 Bad Request
- Network timeout: streamable HTTP connection dropped mid-response

## How this service works

Yeetful — Anthropic Claude Haiku 4.5 inference over MCP Streamable HTTP, hosted at anthropic.yeetful.com. Exposes ask_claude (single-prompt completion) and claude_chat (multi-turn) tools, capped at 256 output tokens per call. Pay-per-call in USDC on Base. Operated by yeetful.com. Keywords: yeetful, anthropic, claude, haiku, mcp, x402, inference, llm.

## Output

Returns a text completion or chat response from Claude Haiku 4.5, capped at 256 output tokens. The ask_claude tool returns a single-turn completion; claude_chat returns a multi-turn conversational response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "toolName",
    "inputSchema"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "mcp"
    },
    "example": {
     "type": "object"
    },
    "toolName": {
     "type": "string"
    },
    "transport": {
     "enum": [
      "streamable-http"
     ],
     "type": "string"
    },
    "description": {
     "type": "string"
    },
    "inputSchema": {
     "type": "object"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/anthropic-yeetful-com-5c21a2e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anthropic.yeetful.com](https://www.zero.xyz/host/anthropic.yeetful.com/llms.txt)