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capi2 JSON Canonicalize & SHA-256 Hash
x402
capi2 JSON Canonicalize & SHA-256 Hash is a paid API for AI agents from capi2-demand-tools.onrender.com, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-15).
Accepts any JSON value, returns a canonical (deterministically ordered) JSON string and its SHA-256 hash via the x402 pay-per-call protocol.
Price / call$0.0005
Success—
StatusUnknown
How this service works
Paid x402 utilities and live intelligence for autonomous agents: hashing/encoding plus public web lookup, domain intelligence, API discovery audit, evidence extraction and x402 health.
Output
Returns a JSON object containing two fields: 'canonical' — the input JSON serialized with deterministically sorted keys (RFC 8785 / JSON Canonicalization Scheme style) — and 'sha256' — the hex-encoded SHA-256 hash of that canonical string, usable as a stable fingerprint.
Example use cases
Fingerprint API response for caching
“Take this API response JSON and give me its canonical form and SHA-256 fingerprint so I can use it as a cache key: {"status":"ok","results":[1,2,3],"meta":{"page":1}}.”
Verify two payloads match
“I have two JSON blobs that should be the same data but with different key orderings — can you canonicalize both and return their hashes so I can confirm they're identical?”
Pre-sign JSON document normalization
“Before I sign this JSON contract with my private key I need it in canonical form with deterministic key order — please canonicalize {"signedBy":"alice","amount":500,"currency":"USD"} and give me the SHA-256 hash I should sign.”
Technical details
Endpoint
POSThttps://capi2-demand-tools.onrender.com/v1/json/canonicalizeWhen to prefer
Choose this endpoint when you need a deterministic, order-independent fingerprint of a JSON value — for cache keys, content-addressable storage, pre-signature normalization, or deduplication. It is preferable over rolling your own canonicalization when you need a hosted, pay-per-use micro-service compatible with the x402 autonomous agent payment protocol.
Side effects
- Invalid or unparseable JSON input returns an error
- Missing 'value' field in request body may return a 400 or empty canonical
- Payment not included or insufficient USDC results in 402 Payment Required
- Network timeout on Render cold-start free tier causing delayed first response
- Deeply nested or extremely large JSON may hit size limits
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | — | Any JSON value to canonicalize. |
Output
Schema · Response
{
"type": "json",
"example": {
"sha256": "43258cff...",
"canonical": "{\"a\":1,\"b\":2}"
}
}Tags
x402
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