Example inputPOST /api/v1/x402/expires-header-validate
{
"date_epoch": 1720000000,
"expires_epoch": 1720000300
}Portable intent card · web-api-intelligence
Expires Header Validate API for agents
Expires Header Validate: Expires Header Validate compares Date and Expires timestamps for an explicit cache lifetime from bounded caller-supplied values without an external provider. Call Expires Header Validate before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for Expires Header Validate as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-only execution with no paid upstream, live RPC, web search, credentials, custody, signing, media generator, or input retention. Honest limit: Evaluates only caller-supplied metadata; it performs no DNS lookup, HTTP request, web search, credential use, or persistent storage. Advisory output only; the buyer owns authorization, payment policy, and production decisions.
Intent to transaction
One command, attributed.
The source header follows this discovery route through challenge, payment and delivery without exposing the buyer or request body.
npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/expires-header-validate -m POST -H 'x-delx-source: intent-card-expires-header-validate-api' --max-amount 0.001 -b '{"date_epoch":1720000000,"expires_epoch":1720000300}'Agent discoverydelx/intent-card/v1
{
"intent": "Expires Header Validate for an agent workflow",
"tool_name": "util_expires_header_validate",
"price_usdc": "0.001",
"machine_url": "https://commerce.delx.ai/intents/expires-header-validate-api.json"
}Portable and inspectable