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Delx Commerce — JSON Size Budget
x402
Delx Commerce — JSON Size Budget is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Checks whether a JSON object's serialized byte size falls within a specified maximum budget and returns the exact byte count.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns the exact serialized byte size of the JSON object, a boolean indicating whether it is within the specified maximum_bytes budget, the operation schema identifier, a pass/fail status, and a verifiability envelope including the SHA-256 hash of the input and confirmation that no data was retained or sent to external services.
Example use cases
API payload size gate
“Before I send this JSON config object to the downstream service, check if it's under 512 bytes so I know it won't get rejected: {"env":"prod","retries":3,"timeout":30}”
Agent memory footprint check
“I'm about to store this JSON blob in my agent's working memory — can you tell me how many bytes it is and whether it stays under 256 bytes? Here it is: {"user_id":"u_9821","session":"abc123","flags":["beta"]}”
Webhook event size validation
“My webhook receiver rejects payloads over 2048 bytes — can you verify this event object fits and tell me the exact size? {"event":"order.created","order_id":"ORD-4422","items":[{"sku":"A1","qty":2}],"total":49.99}”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/json-size-budget?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call, trustless utility to measure and validate the byte size of a JSON payload with no signup or API key required. It is ideal for agents that need cryptographically verifiable, auditable proof that input was not retained — particularly useful in privacy-sensitive pipelines, or when you want deterministic, exact byte counts rather than estimates.
Side effects
- Missing or invalid 'value' field returns a validation error
- Missing 'maximum_bytes' field may cause the budget check to fail or return an error
- JSON object exceeds the 128-property maxProperties limit and is rejected
- Malformed JSON input results in a parse error
- Payment not completed causes a 402 response before processing begins
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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