# Nexari Hello World Smoke Test

> Nexari Hello World Smoke Test is a paid API for AI agents from x402.nexari.cloud, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Returns a greeting, current timestamp, and paid amount as a minimal paid x402 smoke-test endpoint operated in Germany.

## Facts

- Endpoint: GET https://x402.nexari.cloud/hello?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexari-hello-world-smoke-test-2440c459
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sF8mysL7q_cHlpVKrlFYK

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 nexari-hello-world-smoke-test-2440c459
```

Example prompt: Make a quick paid test call to the Nexari hello-world endpoint on behalf of my company 'Acme GmbH' — I've already accepted the terms and have the SHA-256 hash ready — just confirm the payment went through and get the greeting back.

## When to prefer this

Choose this endpoint when you need the cheapest and simplest way to verify that an x402 micropayment client is correctly configured — it is the minimal viable paid call in the Nexari ecosystem. Prefer it over other Nexari endpoints when the goal is integration testing, not actual business data retrieval. Ideal for developers or agent builders confirming end-to-end x402 payment flow before deploying more expensive capabilities.

## Known failure modes

- Missing or invalid accept_terms_hash returns an error — must be SHA-256 of /legal/terms.json
- Missing business_name query parameter causes rejection since it is required for B2B calls
- Payment failure or insufficient USDC balance results in 402 Payment Required with no data
- Invalid HTTP method (POST, PUT, etc.) returns method-not-allowed since only GET/HEAD/DELETE are accepted
- Expired or mismatched terms hash may be rejected if terms have been updated

## How this service works

Hallo Welt der Nexari GmbH: kleinster bezahlter Test-Endpunkt, gibt Gruß, Zeit und gezahlten Betrag zurück. Hello world from Germany: smallest paid x402 smoke test, returns greeting, timestamp and paid amount. Voraussetzung/required: accept_terms_hash, business_name (B2B) – /legal/terms.json

## Output

Returns a JSON object containing a greeting string, the current server timestamp, and the amount paid for the call. Confirms the x402 payment was processed successfully.

## 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",
     "required": [
      "accept_terms_hash",
      "business_name"
     ],
     "properties": {
      "name": {
       "type": "string"
      },
      "business_name": {
       "type": "string",
       "description": "Unternehmen, für das gehandelt wird (nur B2B)"
      },
      "accept_terms_hash": {
       "type": "string",
       "description": "SHA-256 der AGB aus /legal/terms.json"
      }
     }
    }
   },
   "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/nexari-hello-world-smoke-test-2440c459/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.nexari.cloud](https://www.zero.xyz/host/x402.nexari.cloud/llms.txt)