# FixLedger Pulse Check

> FixLedger Pulse Check is a paid API for AI agents from fixledger-iota.vercel.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-11-01).

Checks the real-time operational status of a target API, LLM, RPC, or x402 facilitator domain, returning a verified pulse verdict or free outage alert.

## Facts

- Endpoint: POST https://fixledger-iota.vercel.app/api/x402/pulse?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fixledger-pulse-check-025b1718
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pzLnM7mYMkzxxHdxwSyA6

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 fixledger-pulse-check-025b1718 -d '<json body>'
```

Example prompt: Before we proceed, do a pulse check on api.openai.com to see if it's currently operational or experiencing any outages.

## When to prefer this

Choose this endpoint when an AI agent needs a fast, machine-payable, verified real-time status check on a specific API hostname before making downstream calls — especially for LLM providers, Base RPC nodes, Stripe, or x402 facilitators. Prefer it over generic uptime checkers when you need a structured agent_directive output and x402-compatible payment flow, or when you want free emergency outage alerts without upfront cost.

## Known failure modes

- Unknown or unrecognized domain returns an error or no verdict
- Network timeout if the target domain is completely unreachable
- Payment required if the $0.002 USDC x402 flow is not completed (non-outage responses may be paywalled)
- Stale data if the last verification run is older than expected freshness window

## How this service works

Machine-payable MCP and x402 registry of Docker-verified bug fixes and post-cutoff SDK deltas. Free &lt;50ms Peek-Before-Pay check; $0.005 Pay-on-Proof unlock on Base USDC.

## Output

Returns a JSON object with a status field (VERIFIED_PULSE or OUTAGE_ALERT_FREE), the queried domain, the provider name, a human-readable verdict, an agent_directive with recommended next action, a checked_at timestamp, and optionally a count of recent 5-minute error reports. Confirmed outages are returned free of charge.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "domain": {
   "type": "string",
   "description": "Target domain (e.g. 'api.openai.com', 'mainnet.base.org', 'api.stripe.com')."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "domain": {
    "type": "string",
    "examples": [
     "api.openai.com",
     "api.anthropic.com",
     "api.stripe.com",
     "mainnet.base.org",
     "x402.org"
    ],
    "required": true,
    "description": "Target upstream API, LLM, RPC, or x402 facilitator hostname. Confirmed active outages return $0.00 free emergency alerts."
   }
  },
  "discoverable": true
 },
 "output": {
  "type": "object",
  "required": [
   "status",
   "domain",
   "provider",
   "verdict",
   "agent_directive",
   "checked_at"
  ],
  "properties": {
   "domain": {
    "type": "string"
   },
   "status": {
    "enum": [
     "VERIFIED_PULSE",
     "OUTAGE_ALERT_FREE"
    ],
    "type": "string"
   },
   "verdict": {
    "type": "string"
   },
   "provider": {
    "type": "string"
   },
   "checked_at": {
    "type": "string"
   },
   "agent_directive": {
    "type": "string"
   },
   "recent_5m_error_reports": {
    "type": "number"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fixledger-pulse-check-025b1718/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fixledger-iota.vercel.app](https://www.zero.xyz/host/fixledger-iota.vercel.app/llms.txt)