Example inputPOST /api/v1/x402/idempotency-key
{
"payload": {
"job_id": "42",
"action": "resume"
}
}Portable intent card · agent-reliability-security
Idempotency Key API for agents
Derive a deterministic namespaced idempotency key from canonical JSON. Use it before an autonomous workflow acts on untrusted input, changes an API, retries a request, or evaluates production reliability. Returns bounded machine-readable JSON for $0.002 USDC via x402 on Base. Execution is deterministic, first-party, local-only, stateless, and does not call an upstream provider; structured validation failures are not billed.
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/idempotency-key -m POST -H 'x-delx-source: intent-card-idempotency-key-api' --max-amount 0.002 -b '{"payload":{"job_id":"42","action":"resume"}}'Agent discoverydelx/intent-card/v1
{
"intent": "Idempotency Key for an agent workflow",
"tool_name": "util_idempotency_key",
"price_usdc": "0.002",
"machine_url": "https://commerce.delx.ai/intents/idempotency-key-api.json"
}Portable and inspectable