# Superhighway Hash — Text Hashing Utility

> Superhighway Hash — Text Hashing Utility is a paid API for AI agents from superhighway.walls.sh, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Computes a cryptographic hash (MD5, SHA-1, SHA-256, SHA-384, or SHA-512) of a given text string, returning the result in hex, base64, or base64url encoding.

## Facts

- Endpoint: GET https://superhighway.walls.sh/hash
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/superhighway-hash-text-hashing-utility-1f21831b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jRjsSZW0Tzk7QqWc2ugwj

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 superhighway-hash-text-hashing-utility-1f21831b
```

Example prompt: Hash the text 'hello world' using SHA-256 and give me the result in base64 encoding.

## When to prefer this

Use this endpoint when you need a quick, pay-per-call cryptographic hash of a text string without setting up a local hashing library, or when operating in an environment where calling an external API is more convenient. Good for lightweight integrity checks, token generation, or producing deterministic identifiers from text.

## Known failure modes

- Missing required 'text' parameter returns an error
- Invalid algorithm name not in [md5, sha1, sha256, sha384, sha512] may return an error or default
- Invalid encoding value not in [hex, base64, base64url] may return an error or default
- Empty string input may return a valid hash of empty content
- Payment failure (x402) if USDC balance is insufficient

## How this service works

Web search built for AI agents. Search the live web, pull recent news, and read any page as clean markdown — pay per call, free tier to start.

## Output

Returns the cryptographic hash of the input text as a string in the requested encoding (hex, base64, or base64url), computed using the specified algorithm (SHA-256 by default).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "algo": {
   "type": "string",
   "description": "md5, sha1, sha256 (default), sha384, sha512."
  },
  "text": {
   "type": "string",
   "description": "The text to hash."
  },
  "encoding": {
   "type": "string",
   "description": "hex (default), base64, base64url."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/superhighway-hash-text-hashing-utility-1f21831b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from superhighway.walls.sh](https://www.zero.xyz/host/superhighway.walls.sh/llms.txt)