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Canonical Digests — SHA-256, SHA-512/256 and BLAKE2b
x402
Canonical Digests — SHA-256, SHA-512/256 and BLAKE2b is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Computes SHA-256, SHA-512/256, and BLAKE2b-512 hashes of a text string or canonical JSON object using a deterministic canonicalization scheme.
Price / call$0.003
Success—
StatusUnknown
How this service works
Canonical digests — sha256, sha512-256 and blake2b of text or canonical JSON — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object containing boolean 'ok', 'type' field ('hash'), the 'sha256' hex digest (64 chars), 'sha512_256' hex digest (64 chars), 'blake2b512' hex digest (128 chars), 'input_kind' indicating whether input was treated as text or JSON, a 'deterministic' boolean, the 'canonicalization' scheme name used (e.g. genesis402-canonical-json-v1), a 'canonical_preview' of the normalized input, and a 'receipt' object with tx_hash, amount_usd, and receipt_id from the x402 payment.
Example use cases
Fingerprinting a smart contract payload
“I need a deterministic SHA-256 and BLAKE2b fingerprint of this JSON config before I submit it on-chain: {"contract":"0xabc","params":{"to":"0xdef","value":1000}} — please canonicalize it so key order doesn't matter.”
Content integrity check for stored document
“Can you compute the SHA-256 and SHA-512/256 hashes of this text so I can store them alongside the document as integrity checksums? The text is: 'All employees must read and sign the updated NDA by Friday.'”
Deterministic ID generation for deduplication
“I want a stable, canonical hash of this JSON record to use as a deduplication key in my database — run it through BLAKE2b and SHA-256 with canonical JSON normalization: {"user_id":42,"event":"signup","ts":"2024-01-01"}.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/hash?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, multi-algorithm hashes (SHA-256, SHA-512/256, and BLAKE2b together in one call) especially for JSON objects where key ordering must be normalized before hashing. Prefer it over generic hash libraries when you need canonical JSON normalization, a verifiable payment receipt, or all three digest algorithms in a single request without running local code.
Side effects
- Input text exceeds 65536 character limit — request rejected
- Invalid JSON passed to 'json' field — canonicalization fails
- Both 'text' and 'json' omitted — missing input error
- Malformed request body — schema validation error
- Payment failure or insufficient funds — x402 payment rejected, no hash returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "hash",
"sha256": "43258cff783fe7036d8a43033f830adfc60ec037382473548ac742b888292777",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.003,
"receipt_id": "g402-<16hex>"
},
"blake2b512": "<128hex>",
"input_kind": "json",
"sha512_256": "<64hex>",
"deterministic": true,
"canonicalization": "genesis402-canonical-json-v1",
"canonical_preview": "{\"a\":1,\"b\":2}"
}
}Tags
x402
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