InputPOST /api/v1/x402/is-hex-shape
{
"hex": "0xffaa"
}Local chain primitives · chain-primitives-local
Delx Is Hex Shape
Validate even-length hex (optional 0x). Call when you preflight calldata/hash hex before chain tools. Returns valid boolean for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.
One-command purchase
Run it from an agent.
No account or API key. AgentCash reads the 402 challenge, pays no more than the declared cap, retries the request and returns the result.
npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/is-hex-shape -m POST -H 'x-delx-source: product-page' --max-amount 0.001 -b '{"hex":"0xffaa"}'Delivered resultapplication/json
{
"schema": "delx/util-is-hex-shape/v1",
"valid": true,
"hex": "0xffaa"
}Machine-readable evidence