AgentHub JSON Validation & Canonical Normalization

x402

AgentHub JSON Validation & Canonical Normalization is a paid API for AI agents from 3dprintedcat.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Validates, hashes, and canonicalizes a JSON payload, returning byte size, SHA-256 digest, validity flag, and normalized canonical form.

Price / call$0.002

Seller volume →—

Success—

StatusUnknown

How this service works

AgentHub provides low-cost x402 utilities for AI agents: security scanning, validation, temporary storage, page hosting, and public endpoint inspection.

Output

Returns a JSON object with: bytes (integer byte count of the input), valid (boolean), sha256 (hex digest string), and canonicalJson (the deterministically normalized JSON string with sorted keys and no extra whitespace).

Example use cases

Example prompt

“Can you validate this JSON and give me its SHA-256 hash and canonical form: {"task":"summarize","items":[1,2]}?”

Technical details

Endpoint

POSThttps://3dprintedcat.com/agenthub-json.php

When to prefer

Use this endpoint when you need a cheap, fast, deterministic way to validate JSON, compute its SHA-256 digest, or produce a canonical normalized form — especially useful before signing, comparing, or storing JSON payloads in an AI agent workflow where consistency matters.

Side effects

Invalid or malformed JSON input returns valid: false with no canonical form
Empty body may return an error or zero-byte result
Oversized payloads may be rejected or time out
x402 payment failure returns 402 Payment Required before processing

Input

{
  "json": "{\"task\":\"summarize\",\"items\":[1,2,3]}"
}

Output

{
  "bytes": 36,
  "valid": true,
  "sha256": "7056cfb799cccf8560e04a676b5fc0a3eab57d3f677d55aa0561a7566e45d309",
  "maxBytes": 100000,
  "canonicalJson": "{\"items\":[1,2,3],\"task\":\"summarize\"}"
}

Schema · Response

{
  "type": "json",
  "example": {
    "bytes": 34,
    "valid": true,
    "sha256": "<digest>",
    "canonicalJson": "{\"items\":[1,2],\"task\":\"summarize\"}"
  }
}

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How this service works

AgentHub provides low-cost x402 utilities for AI agents: security scanning, validation, temporary storage, page hosting, and public endpoint inspection.

Output

Technical details

Endpoint

POSThttps://3dprintedcat.com/agenthub-json.php

When to prefer

Side effects

Invalid or malformed JSON input returns valid: false with no canonical form
Empty body may return an error or zero-byte result
Oversized payloads may be rejected or time out
x402 payment failure returns 402 Payment Required before processing

Input

{
  "json": "{\"task\":\"summarize\",\"items\":[1,2,3]}"
}

Output

{
  "bytes": 36,
  "valid": true,
  "sha256": "7056cfb799cccf8560e04a676b5fc0a3eab57d3f677d55aa0561a7566e45d309",
  "maxBytes": 100000,
  "canonicalJson": "{\"items\":[1,2,3],\"task\":\"summarize\"}"
}

Schema · Response

{
  "type": "json",
  "example": {
    "bytes": 34,
    "valid": true,
    "sha256": "<digest>",
    "canonicalJson": "{\"items\":[1,2],\"task\":\"summarize\"}"
  }
}