# MimirAPI Ping (x402 Liveness Probe)

> MimirAPI Ping (x402 Liveness Probe) is a paid API for AI agents from mimirapi.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns a pong confirmation, SKU id, and server timestamp as a paid x402 liveness check for $0.001 USDC per call.

## Facts

- Endpoint: GET https://mimirapi.com/v1/ping
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mimirapi-ping-x402-liveness-probe-2e7f3bec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TLL4kpRCC4Hipe5ayG2gt

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 mimirapi-ping-x402-liveness-probe-2e7f3bec
```

Example prompt: Run the MimirAPI ping liveness probe to confirm my x402 client wiring works — I want to see the pong response, the SKU id, and the server timestamp back.

## When to prefer this

Use this endpoint when you need the cheapest possible end-to-end validation that your x402 payment client is correctly wired — challenge, sign, settle, and serve — before committing real money to more expensive MimirAPI SKUs or other x402-enabled services. It is purpose-built as a developer smoke test for the x402 payment protocol.

## Known failure modes

- Payment not provided or malformed x402 headers — server returns 402 Payment Required
- Insufficient USDC balance in wallet — payment settlement fails
- Incorrect x402 client configuration — challenge/sign step rejected
- Network timeout before settlement completes
- Invalid or expired payment challenge — 402 with re-challenge required

## How this service works

Paid liveness probe for the MimirAPI counter. Returns pong, the SKU id, and a server timestamp. One tenth of a cent buys a complete challenge, sign, settle, serve round trip — the cheapest possible proof that your x402 client wiring works before you spend real money on real SKUs.

## Output

A JSON object with three fields: `pong` (boolean true), `sku` (string identifier for the endpoint SKU), and `ts` (ISO-8601 server timestamp) — confirming a full x402 challenge, sign, settle, and serve round trip completed successfully for $0.001 USDC.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "pong",
      "sku",
      "ts"
     ],
     "properties": {
      "ts": {
       "type": "string",
       "description": "ISO-8601 server time"
      },
      "sku": {
       "type": "string"
      },
      "pong": {
       "type": "boolean"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mimirapi-ping-x402-liveness-probe-2e7f3bec/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mimirapi.com](https://www.zero.xyz/host/mimirapi.com/llms.txt)