# SHA-256/384/512, Hex, Base64, Base64URL & CRC32 Hash Tool

> SHA-256/384/512, Hex, Base64, Base64URL & CRC32 Hash Tool is a paid API for AI agents from sigtap-outreach-api.sigtap.workers.dev, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-15).

Computes SHA-256, SHA-384, SHA-512 hashes, hex encoding, base64, base64url, and CRC32 checksum of a UTF-8 input string in a single call

## Facts

- Endpoint: GET https://sigtap-outreach-api.sigtap.workers.dev/tools/hash
- Price: $0.0005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-256-384-512-hex-base64-base64url-crc32-hash-tool-9a67b606
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oSQ5-w4lKfo66yGfDlMrS

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 sha-256-384-512-hex-base64-base64url-crc32-hash-tool-9a67b606
```

Example prompt: Can you compute the SHA-256, base64, and CRC32 of the string 'hello world' all at once?

## When to prefer this

Choose this endpoint when you need multiple hash or encoding formats for the same string in a single round-trip (SHA-256/384/512 + hex + base64 + CRC32 simultaneously). Prefer it over separate hashing libraries when operating in an agent context without local compute, or when you want a quick trustworthy external hash without importing crypto dependencies. Particularly useful when you need both a cryptographic hash and a CRC32 checksum together for dual-purpose integrity checking.

## Known failure modes

- Missing required 'input' query parameter returns an error
- Non-UTF-8 or binary input may produce unexpected results since the endpoint operates on UTF-8 strings
- Very long strings may hit Cloudflare Worker request size limits
- Payment failure (x402) returns a 402 status before computation occurs

## How this service works

Paid micro-utilities for cold-email outreach agents: domain deliverability audits, cold-email grading, template generation, plus a tools toolbox (hashing, JWT decode, IDs, slugs, JSON, regex, crypto prices, domain age, weather). Paid via x402 (USDC on Base). One signature per call. No keys. FREE CHECK: GET /preview/<paid-path> (same URL with /preview/ prefix) returns a 200 demo sample - verify output shape before paying. PAID CALL: GET the url -> 402 challenge -> sign + retry with X-PAYMENT -> settled on-chain (USDC, Base). Ready-to-paste client: GET /llms.txt section "Pay in one call". Catalog+MCP twin: /llms.txt.

## Output

Returns a JSON object containing: hex encoding, CRC32 checksum (hex), base64, base64url, SHA-256, SHA-384, SHA-512 digests (all hex-encoded), plus character length and byte length of the input string.

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

## Response schema (JSON Schema)

```json
{
 "example": {
  "hex": "68656c6c6f",
  "crc32": "3610a686",
  "base64": "aGVsbG8=",
  "length": 5,
  "sha256": "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
  "sha384": "59e1748777448c69de6b800d7a33bbfb9ff1b463e44354c3553bcdb9c666fa901a1a751c9fb642405954b1ed74a74210",
  "sha512": "9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2dff72519673ca72323c3d99ba5c11d7c7acc6e14b8c5da0c4663475c2e5c3adef46f73bcdec043",
  "base64url": "aGVsbG8",
  "byte_length": 5
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sha-256-384-512-hex-base64-base64url-crc32-hash-tool-9a67b606/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sigtap-outreach-api.sigtap.workers.dev](https://www.zero.xyz/host/sigtap-outreach-api.sigtap.workers.dev/llms.txt)