# TripGuard Fare Intelligence Echo

> TripGuard Fare Intelligence Echo is a paid API for AI agents from tripguard-fare-intel.onrender.com, paid per call via x402, $0.12/call, status unknown (last checked 2026-10-11).

Echoes back a submitted text message with a SHA-256 hash and timestamp — the actual transport/test endpoint underlying the TripGuard fare intelligence service.

## Facts

- Endpoint: POST https://tripguard-fare-intel.onrender.com/echo?utm_source=zero.xyz
- Price: $0.12/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tripguard-fare-intelligence-echo-5760c003
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZZgs2vphREndOL8TAZsJi

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 tripguard-fare-intelligence-echo-5760c003 -d '<json body>'
```

Example prompt: Send the message 'hello world' to the TripGuard echo endpoint and show me the SHA-256 hash and timestamp you get back.

## When to prefer this

Use this endpoint when you need to verify connectivity and response format of the TripGuard service, validate that a text string hashes to an expected SHA-256 value, or obtain a server-side timestamp receipt for a submitted message. Do not use this endpoint if you actually need flight price predictions, fare fraud detection, or booking links — this is an echo/test endpoint, not the intelligence layer.

## Known failure modes

- Empty or missing 'message' field returns a validation error — message must be between 1 and 4096 characters
- Message exceeding 4096 characters is rejected
- Payment not received or insufficient USDC causes a 402 Payment Required response
- Service unavailable on Render cold start may cause timeout or 503 error

## How this service works

Real-time airfare intelligence for AI travel-booking agents: flight price-drop prediction, fare-fraud and deal-legitimacy verification, and verified booking links for any route and date. Pay-per-call in USDC on Base. No API key.

## Output

A JSON object containing three fields: 'echo' (the original input message reflected back), 'sha256' (a SHA-256 hash of the echoed message), and 'timestamp' (an ISO 8601 UTC datetime of when the call was processed).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "message": {
   "type": "string",
   "maxLength": 4096,
   "minLength": 1,
   "description": "Text to echo back."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "echo": "hello world",
  "sha256": "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9",
  "timestamp": "2026-08-18T12:00:00.000Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tripguard-fare-intelligence-echo-5760c003/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tripguard-fare-intel.onrender.com](https://www.zero.xyz/host/tripguard-fare-intel.onrender.com/llms.txt)