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JSON Size Budget
x402
JSON Size Budget 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).
Measures the compact UTF-8 byte size of a JSON object against a caller-supplied byte budget and returns a pass/fail validation result with counts and normalized values
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Size Budget: JSON Size Budget measures compact UTF-8 JSON size against a byte budget from bounded caller-supplied values without an external provider. Call JSON Size Budget 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 Size Budget as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-pa…
Output
Returns a versioned deterministic JSON object containing the compact UTF-8 byte count of the serialized input, a pass/fail result against the specified maximum_bytes budget, normalized size values, and a versioned result contract identifier.
Example use cases
Pre-flight payload size check
“Before I send this structured output to the downstream tool, check whether it fits within 2048 bytes — here's the JSON: {"report":{"id":"r42","lines":["Line one","Line two","Line three"],"summary":"All clear"}}”
Agent batch plan size guard
“I'm about to hand this batch plan to a tool with a strict 1024-byte contract — can you measure it and tell me if it passes? The plan is {"steps":[{"id":1,"action":"fetch"},{"id":2,"action":"transform"},{"id":3,"action":"store"}]}”
LLM output size constraint validation
“My downstream API only accepts responses under 256 bytes — check if this structured result passes: {"status":"ok","confidence":0.91,"label":"positive"}”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-size-budgetWhen to prefer
Use this endpoint when an AI agent needs to verify that a structured JSON payload or batch plan fits within a downstream tool's strict byte-size contract before handoff, without relying on any external provider or runtime environment. Prefer it over manual size estimation when you need a deterministic, versioned, auditable result with normalized counts.
Side effects
- Input object exceeds maxProperties limit of 128 keys — validation error returned
- maximum_bytes not provided — missing required parameter error
- Value field not a valid JSON object — type validation failure
- Extremely deeply nested objects may be rejected by property limits
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | object | Value supplied to JSON Size Budget; used only for this bounded calculation and processed in memory without retention. |
| maximum_bytes | integer | Maximum Bytes supplied to JSON Size Budget; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"bytes": 19,
"within_budget": true
},
"schema": "delx/util-json-size-budget/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "293a834474416653f334e4892f6eb0f0f2c98b11baddda224806b004dd8fbfba",
"external_calls": 0
},
"operation": "data_batch:json_size_budget"
}
}Tags
x402
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