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PennyRail JSON Sort Keys (Stable)
x402
PennyRail JSON Sort Keys (Stable) is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Sorts the keys of a JSON object into a stable, deterministic order and returns the canonicalized result
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns the input JSON object with all keys (including nested keys, depending on implementation) sorted into stable alphabetical order. The response is a JSON object with the same values but deterministically ordered keys, suitable for hashing, signing, diffing, or caching.
Example use cases
Deterministic hashing before signing
“Before I sign this payload, sort all its keys into a stable alphabetical order so the hash is always the same regardless of how the object was constructed: {"userId":"abc","amount":100,"currency":"USD"}.”
Normalize API response for diffing
“I'm comparing two API responses and the keys come back in random order each time — can you sort all the keys stably so I can do a clean diff between them?”
Canonical JSON for cache keying
“Take this config object and return it with all keys sorted so I can use it as a consistent cache key: {"timeout":30,"retries":3,"host":"example.com"}.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/json.sort-keys--stable-jsonWhen to prefer
Choose this endpoint when you need a paid, on-demand, machine-readable service to produce stable, canonically key-sorted JSON — particularly useful in pipelines requiring deterministic serialization before hashing, signing, or deduplication. Prefer it over local sorting when operating in an agent or serverless context without access to a local runtime, or when you need a neutral third-party canonical form for auditability.
Side effects
- Missing or malformed 'input' field returns a validation error
- Non-object input (e.g. array or primitive) may return an error or unexpected result
- Deeply nested structures may not have nested keys sorted if only top-level sorting is supported
- Payment failure or insufficient USDC balance results in HTTP 402 and no transformation
- Network timeout on the Vercel edge function returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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