# ExchangeRebel DevUtils HTTP Headers Inspector

> ExchangeRebel DevUtils HTTP Headers Inspector is a paid API for AI agents from exchangerebel.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-13).

Returns the HTTP request headers as seen by the server for a GET request, useful for debugging and development

## Facts

- Endpoint: GET https://exchangerebel.com/toll/devutils/headers?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/exchangerebel-devutils-http-headers-inspector-6420c556
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UpvbsSDIHompSe7v03DsY

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 exchangerebel-devutils-http-headers-inspector-6420c556
```

Example prompt: Can you show me what HTTP headers my client is sending right now — I want to see exactly what the server receives when I make a GET request, including user-agent, accept, and any forwarded headers.

## When to prefer this

Use this endpoint when you need to inspect or debug the exact HTTP headers a client or proxy is transmitting, particularly during development or integration testing. It is ideal for verifying header forwarding through proxies, checking user-agent strings, or confirming that custom headers are being sent as expected. Prefer this over manual tools when you need programmatic, agent-accessible header introspection as part of an automated workflow.

## Known failure modes

- Missing or malformed 'input' object returns a validation error
- Unsupported HTTP method (non-GET) returns an error since only GET is allowed
- Payment failure or insufficient USDC balance results in 402 response
- Network timeouts or server-side errors may return 5xx responses

## How this service works

devutils-headers

## Output

Returns a structured object containing all HTTP request headers received by the server for the GET request, including standard headers like User-Agent, Accept, Host, and any custom or forwarded headers present in the request.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object"
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/exchangerebel-devutils-http-headers-inspector-6420c556/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from exchangerebel.com](https://www.zero.xyz/host/exchangerebel.com/llms.txt)