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Delx Hex Prefix
x402
Delx Hex Prefix is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).
Normalizes a hex string by optionally adding or removing the 0x prefix and checking that its length is even
Price / call$0.001
Success—
StatusUnknown
How this service works
Normalize a hexadecimal string with optional prefix and even-length validation. Call when you need this bounded result before handing data to a downstream tool. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Honest limit: execution uses only caller-supplied data in memory; it does not call a paid upstream, retain input, search the web, read a live RPC, or invoke a media generator. Results are advisory; the caller owns authorization, budgets, and production control…
Output
Returns deterministic JSON containing the normalized hex string, whether the 0x prefix was added or removed based on the prefer_0x flag, and whether the hex had a valid even-length. The response is machine-readable and stateless.
Example use cases
Preflight hex before EVM transaction
“Before I submit this transaction, normalize the hex value 'a3f9c' — make sure it has the 0x prefix and is properly even-length.”
Strip 0x prefix for raw encoding
“I have the hex string '0x4b2d' and I need it without the 0x prefix for a raw byte encoding step — can you strip it and confirm it's even-length?”
Validate hex format in agent pipeline
“My pipeline just produced the hex '9f3' — can you check if it's even-length and return a clean normalized version with the 0x prefix?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/hex-prefix?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cheap, fast, stateless micro-utility to normalize hex strings for agent preflight checks, EVM-compatible encoding, or any workflow that requires consistent 0x-prefixed or unprefixed, even-length hex before passing data to downstream systems. Prefer it over custom code when you want deterministic, auditable hex normalization without maintaining in-house utility logic.
Side effects
- Input hex contains non-hexadecimal characters — returns error indicating invalid hex
- Empty hex string provided — may return error or empty normalized result
- Odd-length hex that cannot be auto-padded — returns validation failure indicator
- Malformed JSON request body — returns 400-level error
- Payment not received or x402 flow incomplete — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hex | string | Input field: hex. |
| prefer_0x | boolean | Input field: prefer 0x. |
Output
Schema · Response
{
"type": "json",
"example": {
"hex": "0x0abc",
"valid": false,
"schema": "delx/util-hex-prefix/v1",
"prefer_0x": true,
"even_length": 4
}
}Tags
x402
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