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FastX402 Lab – JSON Patch Apply
x402
FastX402 Lab – JSON Patch Apply is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-27).
Applies an RFC 6902 JSON Patch (add, remove, replace, move, copy, test operations) to a JSON document and returns the patched result atomically.
Price / call$0.001
Success—
StatusUnknown
How this service works
200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns the fully patched JSON document as the 'result' field. If any patch operation fails (e.g. a 'test' op mismatch, a missing path, or an invalid operation), an error is returned and no partial changes are applied — the operation is atomic.
Example use cases
Update nested config field
“I have a JSON config object {"server":{"port":8080,"debug":false}} and I want to apply the patch [{"op":"replace","path":"/server/debug","value":true}] — can you run that patch and return the updated config?”
Atomic multi-op document edit
“Apply these three patch operations atomically to my JSON: add a new field, remove an old one, and test that the version is 2 — if the test fails I don't want any changes applied. The document is {"version":2,"legacy":true} and the patch is [{"op":"test","path":"/version","value":2},{"op":"remove","path":"/legacy"},{"op":"add","path":"/active","value":true}].”
Move and copy JSON fields
“Take my JSON object {"a":1,"b":2} and apply the patch [{"op":"move","from":"/a","path":"/c"},{"op":"copy","from":"/b","path":"/d"}] so that field a becomes c and b is also copied to d.”
Technical details
Endpoint
GEThttps://fastx402.tools/json-patch-apply?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to apply RFC 6902-compliant JSON Patch operations atomically — especially when using 'test' operations to guard changes, or when mixing multiple ops (add, remove, replace, move, copy) and requiring all-or-nothing semantics. Prefer it over manual string manipulation or custom merge logic when working with structured JSON documents in an agent workflow at very low cost ($0.001/call).
Side effects
- Invalid path reference returns an error with the offending path
- Failing 'test' operation returns an error and no changes are applied
- Malformed JSON in either the document or patch array returns a parse error
- Invalid op value (not in add/remove/replace/move/copy/test) returns a validation error
- Missing required query parameters (json or patch) returns a bad request error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"name": "fastx402",
"tools": 104,
"chains": [
"base",
"solana"
]
}
}
}Tags
x402
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