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Agent402 UK JSON Diff
x402
Agent402 UK JSON Diff is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).
Computes a structural diff between two JSON objects, returning added, removed, and changed paths.
Price / call$0.001
Success—
StatusDown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
A structured JSON diff report listing the paths that were added in B but not A, paths removed from A that are absent in B, and paths where values changed between A and B, enabling precise identification of structural mutations between two JSON states.
Example use cases
Mid-task agent state verification
“I need to check what changed in my agent's state between two steps — the state before was {"task":"search","results":null,"done":false} and after it ran it's {"task":"search","results":["a","b"],"done":true}. Can you diff those and tell me what paths were added or changed?”
API response regression detection
“My API is returning a different shape than yesterday — can you compare yesterday's response {"user":{"id":1,"role":"admin"}} with today's {"user":{"id":1}} and show me what got removed?”
Configuration drift detection
“I have two versions of a config object and I want to know exactly which keys drifted — the original is {"timeout":30,"retries":3,"debug":false} and the new one is {"timeout":60,"retries":3,"verbose":true}. What was added, removed, or changed?”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/utils/json/diffWhen to prefer
Use this endpoint when you need a fast, precise structural diff between two JSON objects without writing custom comparison logic — ideal for mid-task state comparison in agentic workflows, configuration drift detection, or API response regression checks. Prefer it over manual comparison or general-purpose code execution when you need a clean list of added/removed/changed paths in a single lightweight call.
Side effects
- Non-object inputs (arrays or primitives instead of objects) may be rejected or produce unexpected results
- Deeply nested or very large JSON objects may hit payload size limits
- Malformed JSON syntax in either input will return a validation error
- Missing 'a' or 'b' fields in the request body will cause an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| a | object | Left value |
| b | object | Right value |
Output
Schema · Response
{
"type": "json",
"example": {
"added": [
"y"
],
"equal": false,
"changed": [
{
"to": 2,
"from": 1,
"path": "x"
}
],
"removed": []
}
}Tags
x402
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