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TaskMint Field Diff
x402
TaskMint Field Diff is a paid API for AI agents from taskmint-sign-proof-node22-production.up.railway.app, paid per call via x402, $0.0005/call, status unknown (last checked 2026-10-10).
Compares two object snapshots across specified fields and returns a structured diff showing which fields changed, their before/after values, and a resolved status.
Price / call$0.0005
Success—
StatusUnknown
How this service works
Exact native USDC on Base; externally owned wallets only. Generate a private 32-byte random request_token for each new job, persist the entire body, and reuse it for challenge/retry and recovery. The token grants result access. Do not log or share it. HTTP 202 or an uncertain transport failure requires recovery with the identical body without a signature, never a new purchase. Results expire after 24 hours. Ten bounded deterministic services. Local execution is free; hosted jobs require customer-authorized payment only when billable.
Output
A JSON object with a 'result' containing: a boolean 'changed' flag, a 'status' field (e.g. 'resolved'), a 'changes' array listing each changed field with its before and after values, a 'flags' array for anomalies, 'checked_fields' listing all fields evaluated, 'evidence' with the full before/after snapshots, 'freshness' note, and a 'version' string. Payment state is also returned.
Example use cases
Detect price drop in product listing
“I have two snapshots of a product record — before it had a price of $49.95 and stock of 20, now it shows $44.95 and stock of 16. Can you diff just the price and stock fields and tell me exactly what changed?”
Monitor config changes between deployments
“Here are the before and after states of our app config object. Check the fields timeout, max_retries, and feature_flag_enabled and tell me which ones changed between the two versions.”
Audit record edits in CRM data
“A customer record was updated — here are the old and new versions. I need to know which of these fields changed: email, phone, tier, and account_status. Give me a clear diff with the before and after values.”
Technical details
Endpoint
POSThttps://taskmint-sign-proof-node22-production.up.railway.app/api/agent/field_diff?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, structured field-level diff between two object snapshots you already have locally — especially when you want to track specific named fields (price, stock, status, etc.) rather than a full recursive diff. It is ideal for agentic workflows that poll or compare API responses over time and need a reliable, paid-per-call micro-service with retry-safe semantics. Prefer it over general-purpose JSON diff tools when you need structured output with evidence and a clear change flag per field, and when you are already working within the x402/USDC payment infrastructure on Base.
Side effects
- Missing required fields (before, after, fields array) returns a 400 validation error
- fields array exceeding 30 items is rejected
- Invalid or missing request_token format (not 64-char hex) causes rejection
- HTTP 402 returned when payment is required but not authorized
- HTTP 202 with uncertain transport requires retry with identical body and same request_token — do not resubmit with a new token
- Results expire after 24 hours; retrieval after expiry fails
- Using a contract wallet instead of an externally owned wallet causes payment failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payload | object | |
| request_token | string | Generate 32 cryptographically random bytes as lowercase hex for each new job. Keep this private result credential and reuse the identical body for retries. Replace the synthetic example token. |
Output
Schema · Response
{
"type": "json",
"example": {
"state": "paid",
"result": {
"flags": [],
"status": "resolved",
"changed": true,
"changes": [
{
"after": 44.95,
"field": "price",
"before": 49.95
},
{
"after": 16,
"field": "stock",
"before": 20
}
],
"version": "0.5.0",
"evidence": {
"after": {
"price": 44.95,
"stock": 16,
"status": "available"
},
"before": {
"price": 49.95,
"stock": 20,
"status": "available"
}
},
"freshness": "Client-supplied snapshots only. No live source check.",
"checked_fields": [
"price",
"status",
"stock"
]
},
"service": "field_diff"
}
}Tags
x402
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