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Delx Idempotency Key
x402
Delx Idempotency Key is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Derives a deterministic, namespaced idempotency key from canonical JSON to prevent duplicate operations in autonomous workflows.
Price / call$0.002
Success—
StatusUnknown
How this service works
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.
Output
Returns a bounded machine-readable JSON object containing the deterministic, namespaced idempotency key derived from the canonical representation of the input JSON payload. Structured validation failures are returned as non-billed error responses.
Example use cases
Safe retry before payment API call
“I'm about to retry a payment request and need a deterministic idempotency key — derive one from this payload in the 'payments' namespace: {"userId":"u_456","amount":99.99,"currency":"USD"} so I don't accidentally charge twice.”
Deduplicating autonomous workflow actions
“My agent is about to act on untrusted input and I need to make sure it doesn't run the same operation twice — can you compute an idempotency key for this action payload in the 'workflow' namespace: {"action":"send_email","to":"alice@example.com","templateId":"onboarding-v2"}?”
Stable key for distributed API state
“Generate a namespaced idempotency key from this JSON under the 'orders' namespace: {"orderId":"ord_789","items":["sku_a","sku_b"],"quantity":3} — I need the same input to always produce the same key across retries.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/idempotency-keyWhen to prefer
Choose this endpoint when you need a fully deterministic, reproducible idempotency key derived from a JSON payload without any external state or upstream provider calls. It is ideal for autonomous agents that must deduplicate actions before retrying requests, acting on untrusted input, or calling state-changing APIs. Prefer it over rolling your own hashing logic when you need a namespaced, canonical, and billing-safe key derivation with structured error responses.
Side effects
- Invalid or non-serializable payload — returns structured validation error without billing
- Namespace exceeds 200 character limit — returns validation error
- Malformed JSON input — structured error returned, no charge incurred
- Payment failure via x402 — request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payload | — | JSON value whose canonical representation identifies one logical operation. |
| namespace | string |
Output
Schema · Response
{
"type": "json",
"example": {
"key": "delx_ca094a4752e182cfcac50a38d65de7c7e4f271ee05c08f26853c75f0ba24b049",
"schema": "delx/idempotency-key/v1",
"algorithm": "sha256",
"namespace": "default",
"payload_sha256": "f85c6736261be7d990522f91e81634f844ad23c515f3b4029e197ab01a2d18dc"
}
}Tags
x402
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