# State Machine Liveness MCP

> State Machine Liveness MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-10-24).

Checks or processes liveness conditions for a state machine, determining whether a given state machine configuration can make progress or reach a target state.

## Facts

- Endpoint: POST https://api.m2mcent.com/state-machine-liveness-mcp/api/process?utm_source=zero.xyz
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/state-machine-liveness-mcp-7c7b10b2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Tv9_K-0NR9ovr4GjWkDr_

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 state-machine-liveness-mcp-7c7b10b2 -d '<json body>'
```

Example prompt: Check if this state machine definition can make progress and won't deadlock — here's the state data: '{"states":["idle","running","done"],"transitions":[{"from":"idle","to":"running"},{"from":"running","to":"done"}],"initial":"idle"}'

## When to prefer this

Use this endpoint when you need to formally verify that a state machine definition satisfies the liveness property — i.e., that it can always make progress and reach a goal state without deadlocking. Prefer this over manual inspection when the state machine is complex, when correctness is critical, or when you need an automated, programmatic liveness check as part of a CI/CD or deployment pipeline.

## Known failure modes

- Invalid or malformed state machine JSON causes processing error
- Missing required 'data' field returns a bad request error
- State machine with no transitions cannot be analyzed
- Payment failure (402) if USDC balance is insufficient
- Timeout if state machine definition is extremely large or complex

## How this service works

The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.

## Output

Returns an analysis of the state machine's liveness properties, indicating whether the machine can make progress, reach terminal states, and avoid deadlock. May include reachability results, identified problematic states, and an overall liveness verdict.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/state-machine-liveness-mcp-7c7b10b2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2mcent.com](https://www.zero.xyz/host/api.m2mcent.com/llms.txt)