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Delx Idempotency Fingerprint
x402
Delx Idempotency Fingerprint is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Generates a deterministic SHA-256 idempotency fingerprint from a caller-supplied scope and JSON payload without storing any state.
Price / call$0.003
Success—
StatusUnknown
How this service works
Create a stable SHA-256 idempotency fingerprint from a scope and canonical payload without storing state — call when writing a ledger or workflow event that must not double-apply. Use before side effects when composing multi-step agent jobs—the same loyalty/workflow demand band agents already pay for on Bazaar, but fully local. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no…
Output
Returns a deterministic machine-readable JSON object containing the computed SHA-256 fingerprint string derived from the provided scope and canonical payload. No state is stored; the same inputs always produce the same fingerprint, making it safe to call multiple times for verification.
Example use cases
Prevent double-posting a ledger entry
“I'm about to commit a payment event to the ledger — generate an idempotency fingerprint with scope 'payments:txn-9981' and payload {"amount":49.99,"currency":"USDC","recipientId":"acct-77"} so I can verify it hasn't already been applied.”
Deduplicate a multi-step agent workflow
“Before my agent fires the next step in the onboarding workflow, create a SHA-256 fingerprint with scope 'onboarding:session-abc123' and payload {"userId":"u-555","step":"email-verify","ts":"2024-06-01T10:00:00Z"} to guard against replay.”
Guard a loyalty-reward event from replay
“Hash this reward event so I can check for duplicates before crediting the account — use scope 'rewards:campaign-spring24' and payload {"memberId":"m-002","rewardType":"bonus_points","value":500}.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/idempotency-fingerprintWhen to prefer
Choose this endpoint when you need a stateless, deterministic idempotency key derived from a canonical payload — especially before committing ledger entries, workflow events, or side-effecting operations in multi-step agent pipelines. It is ideal when you want no server-side state storage, no upstream dependency, and a guaranteed reproducible SHA-256 hash from the same inputs. Prefer it over rolling your own hashing logic when you need a paid, auditable, first-party fingerprinting step in an x402-based agent workflow.
Side effects
- Missing or empty scope field returns a validation error
- Payload is not a valid JSON object — returns a schema error
- Malformed request body returns a 400 bad request
- Payment failure or insufficient USDC balance returns a 402 error
- Network timeout on the x402 payment handshake
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| scope | string | Caller-owned namespace string mixed into the fingerprint. |
| payload | object | JSON payload to fingerprint; values are hashed, not retained. |
Output
Schema · Response
{
"type": "json",
"example": {
"scope": "loyalty",
"schema": "delx/util-idempotency-fingerprint/v1",
"algorithm": "sha256",
"fingerprint": "dc22b29600e074df71fc0f9b0260185e822b228cca615d37992a31dc14eb8f45",
"values_returned": false
}
}Tags
x402
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