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CanonicalHash
x402
CanonicalHash is a paid API for AI agents from canonicalhash-production.up.railway.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).
Produces a stable, deterministic SHA-256 or SHA-512 hash of any JSON payload using RFC 8785 canonicalization, suitable for idempotency keys, cache keys, and cross-runtime deduplication.
Price / call$0.002
Success—
StatusUnknown
How this service works
RFC 8785 JSON Canonicalization + SHA-256/SHA-512. Stable, deterministic hash of any JSON payload for idempotency keys, cache keys, and cross-runtime dedup.
Output
Returns a JSON object containing the canonical JSON string (with keys sorted per RFC 8785), the hex-encoded SHA-256 or SHA-512 hash of that canonical form, the hashing algorithm used, input byte count, canonical byte count, and a success flag.
Example use cases
Idempotency key for payment requests
“Take this payment request JSON — {"user_id": 99, "amount": 250.00, "currency": "USD"} — and give me a SHA-256 canonical hash I can use as an idempotency key so duplicate submissions don't get processed twice.”
Cache key generation for API responses
“I need a stable cache key for this config object: {"region": "us-east-1", "tier": "pro", "features": ["search", "analytics"]}. Can you run it through RFC 8785 canonicalization and return the SHA-256 hash?”
Cross-runtime JSON deduplication
“I'm getting the same event logged from two different services but the JSON key order differs — can you canonicalize both of these payloads with SHA-512 and tell me if they produce the same hash so I know they're actually duplicates?”
Technical details
Endpoint
POSThttps://canonicalhash-production.up.railway.app/v1/canonicalize?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a language- and runtime-agnostic, reproducible hash of a JSON value — especially when key ordering may vary between producers. It is ideal for idempotency keys, cache key generation, and deduplication across heterogeneous systems. Prefer it over ad-hoc JSON serialization + hash because RFC 8785 guarantees canonical ordering, number formatting, and Unicode normalization.
Side effects
- Missing 'payload' body parameter returns an error
- Non-JSON or malformed payload may fail canonicalization
- Unsupported algorithm value (not 'sha256' or 'sha512') returns validation error
- Payment not settled or insufficient funds triggers 402 response
- Network timeout on the Railway-hosted endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"hash": "60196f74f027a2b2a0c2eb1143dd6cc1a2319c87479a846ed0d140e4bc2403e7",
"spec": "RFC 8785",
"success": true,
"algorithm": "sha256",
"canonical": "{\"amount\":1.5,\"note\":\"example\",\"user_id\":42}"
}
}Tags
x402
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