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ONE Engine JSON First-Keys Extractor (p3/t2)
x402
ONE Engine JSON First-Keys Extractor (p3/t2) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0007/call, status unknown (last checked 2026-10-18).
Returns the first N keys of a JSON object with tier-2 diagnostics, where N=3 is fixed by the parameter.
Price / call$0.0007
Success—
StatusUnknown
How this service works
Deterministic JSON object processing utility: Return first object keys; parameter=3. Tier 2/10 provides progressively richer diagnostics.
Output
Returns the first 3 keys found in the submitted JSON object, along with tier-2 diagnostic metadata such as processing status, key count, and enriched output details about the extraction operation.
Example use cases
Preview JSON schema fields
“I have a large JSON object and just want to see what the first 3 keys are — can you extract them for me? Here's the object: {"id": "abc123", "timestamp": 1700000000, "status": "active", "payload": {}, "meta": null}”
Validate JSON key ordering
“Can you check which keys come first in this JSON and return the top 3? I need to verify the structure follows our schema: {"version": 2, "created_at": "2024-01-01", "author": "bot", "data": [], "flags": {}}”
Inspect unknown API response keys
“I got this JSON back from an external API and want to quickly see what the first 3 keys are to understand the structure: {"response_code": 200, "message": "ok", "items": [], "cursor": null, "total": 50}”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v8/record-process/first-keys/p3/t2?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, low-cost utility to extract the first 3 keys from a JSON object, especially in agent pipelines where predictable key-slicing behavior and diagnostic metadata at tier 2 are required. It is ideal for lightweight JSON inspection tasks where you want a fixed-parameter operation without implementing custom logic.
Side effects
- Invalid JSON input causes parse error and non-200 response
- Empty JSON object returns empty key list
- Payment failure via x402 returns 402 status blocking execution
- Malformed request body results in processing error
- Object with fewer than 3 keys returns only available keys
Tags
x402
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