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CanonicalHash Batch Canonicalize
x402
CanonicalHash Batch Canonicalize is a paid API for AI agents from canonicalhash-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Deterministically canonicalizes and SHA-256/512 hashes up to 1000 JSON payloads in a single call, returning an EIP-712 signed attestation for the entire batch
Price / call$0.01
Success—
StatusUnknown
How this service works
Deterministic JSON hashing and structured extraction for AI agents. Three paid routes: /v1/canonicalize (RFC 8785 canonicalization + SHA-256/512 + EIP-712 attestation, $0.002), /v1/canonicalize/batch (up to 1000 payloads, $0.01), /v1/structure/paid (structured JSON extraction from messy text, $0.005). Every successful response includes an EIP-712 signed attestation verifiable against /.well-known/pubkey.json. Verify any attestation for free at POST /v1/verify.
Output
Returns a JSON object containing: a batch ID, the count of processed payloads, the hash algorithm used, the RFC 8785 canonical form and hash for each input payload, a combined batch hash, an EIP-712 signature from a known signer address, chain ID (Base/8453), and an issued_at timestamp. The attestation is verifiable against the service's published public key.
Example use cases
Audit trail for transaction records
“I have a batch of 50 transaction JSON objects that need to be hashed and cryptographically attested before we archive them — can you canonicalize all of them with SHA-256 and give me the signed EIP-712 attestation I can store alongside the archive?”
Deduplicate JSON event logs
“I need to detect duplicate events in this list of 200 JSON log entries — can you canonicalize and hash all of them in one go so I can compare the hashes to find duplicates?”
Blockchain-ready data fingerprinting
“Before we post these 10 JSON configuration snapshots on-chain, please generate RFC 8785 canonical hashes for all of them with SHA-512 so we have a verifiable fingerprint for each one.”
Technical details
Endpoint
POSThttps://canonicalhash-production.up.railway.app/v1/canonicalize/batch?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to hash or canonicalize multiple JSON payloads in a single atomic operation and want a single EIP-712 signed attestation covering the entire batch. It is more cost-efficient than calling the single-payload endpoint repeatedly (batch costs $0.01 vs $0.002 × N for large N > 5). Prefer it when you need a unified batch_hash anchoring all items together, e.g. for audit logs, blockchain anchoring, or deduplication at scale.
Side effects
- Payload array exceeds 1000 items — request rejected with validation error
- Malformed or non-JSON items in the payloads array — individual items may fail or entire batch rejected
- Invalid algorithm value (not sha256 or sha512) — 400 error
- Payment not fulfilled (x402 flow incomplete) — 402 Payment Required
- Service unavailable on Railway infrastructure — 503 or network timeout
- Empty payloads array — 400 validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payloads | array | Up to 1000 JSON values to canonicalize. |
| algorithm | string | Hash algorithm. Default: sha256. |
Output
Schema · Response
{
"type": "json",
"example": {
"spec": "RFC 8785",
"count": 2,
"signer": "0x0326f9783c9C9b9De8b9dC63cCCefDC75A95C7cD",
"results": [
{
"hash": "60196f74f027a2b2a0c2eb1143dd6cc1a2319c87479a846ed0d140e4bc2403e7",
"canonical": "{\"amount\":1.5,\"note\":\"example\",\"user_id\":42}"
},
{
"hash": "a3f0b9c8...truncated",
"canonical": "{\"amount\":2,\"note\":\"second\",\"user_id\":43}"
}
],
"success": true,
"batch_id": "b_01HXX0EXAMPLE000000000000000",
"chain_id": 8453,
"algorithm": "sha256",
"issued_at": "2026-10-16T00:00:00.000Z",
"signature": "0x9f2a...truncated",
"batch_hash": "0xdeadbeef...truncated",
"attestation_type": "EIP-712"
}
}Tags
x402
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