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Delx Commerce — X402 Delivery Size Check
x402
Delx Commerce — X402 Delivery Size Check 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 result object's serialized byte size falls within a specified budget, returning byte count and pass/fail status without retaining the data.
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 a JSON object containing the serialized byte size of the submitted result, a boolean indicating whether it falls within the specified maximum_bytes budget, a pass/fail status string, and an evidence block with SHA-256 hash of the input, a flag confirming no data was retained, and the number of external calls made (always 0).
Example use cases
Pre-flight x402 delivery budget check
“Before I send this result payload over x402, can you check if it's within 1024 bytes and tell me the exact size?”
Agent response size validation
“Validate that this JSON object I'm about to deliver is under 256 bytes — I need a pass or fail with the actual byte count.”
Payload audit with SHA-256 evidence
“Measure the size of this result object against a 2048-byte maximum and give me a verifiable hash of the input so I can prove what was checked.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-delivery-size-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, verifiable, privacy-preserving byte-size check on a result object before committing to an x402 delivery — especially when you need cryptographic evidence (SHA-256) that the input was not retained. Prefer this over a local size calculation when auditability and proof-of-no-retention matter, or when operating in an x402 payment pipeline where delivery size constraints must be enforced.
Side effects
- Missing required 'result' field causes validation error
- 'maximum_bytes' not provided may default to unbounded check or return error
- Result object exceeding 128 properties (maxProperties limit) is rejected
- Payment not included or invalid USDC payment causes 402 response
- Malformed JSON body causes 400 parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| result | object | Result supplied to X402 Delivery Size Check; used only for this bounded calculation and processed in memory without retention. |
| maximum_bytes | integer | Maximum Bytes supplied to X402 Delivery Size Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"bytes": 39,
"within_budget": true
},
"schema": "delx/util-x402-delivery-size-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "076621b47df3f39c3106d66269581bbf20cc78094ab64cec4fdb10ac2b5f03d1",
"external_calls": 0
},
"operation": "delivery_contract:x402_delivery_size_check"
}
}Tags
x402
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