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JSON Required Fields Check
x402
JSON Required Fields Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Validates a JSON object for absent or null required top-level fields, returning counts and normalized findings as versioned deterministic JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Required Fields Check: JSON Required Fields Check finds absent or null required top-level fields from bounded caller-supplied values without an external provider. Call JSON Required Fields Check before an agent hands structured data or a batch plan to a downstream tool with a stricter contract. Returns the bounded transformation or validation finding with counts, normalized values, and a versioned result contract for JSON Required Fields Check as versioned deterministic JSON. Price: $0.001…
Output
Returns a versioned deterministic JSON object including: a list of missing fields, a list of null fields, counts of each, normalized values where applicable, and a versioned result contract identifier. No data is retained after processing.
Example use cases
Preflight check before downstream tool call
“I'm about to pass this structured result to a payment processor that requires 'amount', 'currency', 'recipient_id', and 'reference' — can you check the object for any missing or null required fields before I send it?”
Agent output completeness gate
“My agent just returned this JSON plan object. Verify that all the required fields — 'task_id', 'assigned_to', 'due_date', 'priority', and 'description' — are present and not null before I hand it off to the task management system.”
Schema contract enforcement in a pipeline
“We have a strict contract that every event object must contain 'event_type', 'user_id', 'timestamp', and 'session_id'. Run a required fields check on this batch object and give me the count of missing and null fields.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-required-fields-checkWhen to prefer
Use this endpoint when an AI agent needs a fast, deterministic, in-memory check that a JSON object satisfies a required-field contract before handing it to a stricter downstream tool or API. Prefer it over custom code when you need a versioned, auditable result with field counts rather than a simple boolean, and when you want to avoid retaining sensitive payload data.
Side effects
- Object exceeds 128 property limit — request rejected
- required_fields array exceeds 256 items — request rejected
- Malformed input (non-object passed as 'object') — validation error returned
- Individual field name string exceeds 8192 characters — item rejected
- Network or upstream availability error — HTTP 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| object | object | Object supplied to JSON Required Fields Check; used only for this bounded calculation and processed in memory without retention. |
| required_fields | array | Required Fields supplied to JSON Required Fields Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"complete": true,
"missing_fields": []
},
"schema": "delx/util-json-required-fields-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "3b8f29cd44e029a44371d04cd51467653d8699dd08fc8eb6f9c55cb1aa0707d8",
"external_calls": 0
},
"operation": "data_batch:json_required_fields_check"
}
}Tags
x402
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