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Delx Commerce — X402 Payment Payload Size Calculator
x402
Delx Commerce — X402 Payment Payload Size Calculator 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).
Computes the byte size of an X402 payment payload and checks whether it falls within a specified byte budget.
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 with the payload's byte count, a boolean indicating whether it's within the specified budget, the schema version, a SHA256 hash of the input for auditability, a flag confirming no data is retained, and the number of external calls made (always 0).
Example use cases
Pre-flight payload size check
“Before I send this x402 payment, can you measure how many bytes the payload is and tell me if it's within my 256-byte budget? Payload: {"network":"base","amount":"0.001","recipient":"0xDeAdBeEf","memo":"agent-pay"}.”
Debugging oversized x402 payload
“My x402 payment keeps getting rejected — can you compute exactly how large this payload object is in bytes so I can figure out what to trim? Maximum allowed is 128 bytes.”
Validating payload budget before agent workflow
“I'm building an automated agent that sends x402 micropayments and need to confirm my standard payload template is under 200 bytes — can you check this for me?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-payment-payload-size?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify that an x402 payment payload object fits within a byte budget before transmission, especially in agent workflows where payload size constraints are enforced by the receiving protocol or infrastructure. Prefer this over manual serialization checks when you need a verifiable, auditable result with an input hash for proof of integrity.
Side effects
- Payload exceeds maxProperties limit of 128 — request rejected
- maximum_bytes not provided — within_budget check may not be meaningful
- Malformed payload object — parsing error returned
- Network or server error — non-200 response with no result body
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payload | object | Payload supplied to X402 Payment Payload Size; used only for this bounded calculation and processed in memory without retention. |
| maximum_bytes | integer | Maximum Bytes supplied to X402 Payment Payload Size; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"bytes": 31,
"within_budget": true
},
"schema": "delx/util-x402-payment-payload-size/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "4590ed598201943e731e542786ac6275109501a7a8d678408f346290dd7f31d4",
"external_calls": 0
},
"operation": "delivery_contract:x402_payment_payload_size"
}
}Tags
x402
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