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Delx Commerce — X402 Payment Header Shape Validator
x402
Delx Commerce — X402 Payment Header Shape Validator 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).
Validates the structural shape and encoding of an X402 payment header, returning a pass/fail result with verifiable evidence of in-memory-only processing.
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 indicating whether the x402 payment header shape is valid (shape_valid boolean), the encoding type detected (e.g. base64_json), a pass/fail status, and a verifiable evidence block containing the SHA-256 hash of the input, confirmation that no data was retained, and the count of external calls made (always 0). Also includes the schema version and operation identifier.
Example use cases
Pre-submission x402 header check
“Before I submit this payment, can you validate that my x402 payment header is correctly structured? The header is: 'eyJ0eXBlIjoieDQwMiIsInBheW1lbnQiOnsidG9rZW4iOiJVU0RDIn19'”
Debugging malformed payment header
“My x402 payment is being rejected and I think the header is malformed. Can you run this header through a shape validator so I can see if it passes? Here it is: 'eyJlcnJvciI6ImJhZGhlYWRlciJ9'”
Agent payment pipeline integrity check
“In my automated payment pipeline, I need to verify each x402 payment header shape before processing. Can you validate this header and confirm it's properly base64_json encoded with no external calls made: 'eyJ0eXBlIjoieDQwMiJ9'”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-payment-header-shape?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, privacy-preserving, verifiable check of an x402 payment header's structural validity before submitting a payment. It is ideal for agent payment pipelines that need cryptographic evidence (SHA-256 of input, zero external calls, no data retention) that validation was performed correctly. Prefer this over manual parsing when auditability and verifiable delivery matter.
Side effects
- Header string exceeds 8192 character limit — request rejected
- Malformed or non-base64 header returns shape_valid: false rather than an error
- Missing or empty header field causes validation failure
- Invalid JSON structure in request body returns HTTP 400
- Network timeout on the Delx Commerce endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to X402 Payment Header Shape; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"encoding": "base64_json",
"shape_valid": true
},
"schema": "delx/util-x402-payment-header-shape/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "d2df40bf50f271956773fe4254a5de1a334515afca29fda6e60cd96f1ec08c63",
"external_calls": 0
},
"operation": "delivery_contract:x402_payment_header_shape"
}
}Tags
x402
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