Vault Key Existence Check

x402

Vault Key Existence Check is a paid API for AI agents from agentic-endpoints-testnet.oliver-835.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Checks whether a specific key exists in an encrypted vault namespace without revealing or returning its ciphertext

Price / call$0.001

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Success—

StatusUnknown

How this service works

Check whether a key exists in the vault without returning its ciphertext (requires the namespace_token)

Output

A boolean or status response indicating whether the specified key exists within the given vault namespace, without exposing any ciphertext or plaintext value associated with the key.

Example use cases

Pre-write deduplication check

“Before storing a new secret, check if the key 'oauth_token_user_42' already exists in vault namespace 'user-secrets' so we don't overwrite anything accidentally.”

Audit vault key inventory

“I need to verify that the key 'backup_encryption_key' is present in our vault namespace 'disaster-recovery' — just confirm it exists, don't retrieve the value.”

Conditional agent workflow gating

“Check whether the key 'onboarding_complete' exists in namespace 'tenant-007' before proceeding with the next step in the workflow — I have the namespace token.”

Technical details

Endpoint

GEThttps://agentic-endpoints-testnet.oliver-835.workers.dev/vault/exists

When to prefer

Use this endpoint when you need to confirm key presence in an encrypted vault namespace without the overhead or risk of retrieving and decrypting the value. Prefer this over the full retrieval endpoint when you only need a boolean existence check, want to avoid unnecessary data exposure, or are implementing pre-write deduplication logic or conditional branching in an agent workflow.

Side effects

Invalid or expired namespace_token returns an authorization error
Key not found returns a false/absent status rather than an error
Missing required parameters (key, namespace, or namespace_token) returns a validation error
Namespace does not exist returns an error or not-found response
Rate limiting or payment failure returns a 402 Payment Required or similar error

Input

Schema · Request body

Field	Type	Description
key	string	Item key to test
namespace	string	Vault isolation scope
namespace_token	string	One-time token issued when the namespace was claimed

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