Momentohq Momento Cache HTTP API
72
AI ReadinessAI-Aware (A-)72/100
Agent-ready OpenAPI document · curated by JenticStorageDatabasebearer3 EndpointsREST
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For Agents
Get, set, and delete cache items from a Momento serverless cache via a minimal HTTP API designed for serverless and edge runtimes.
Use for: Set a value in a Momento cache by key, Get a cached value from Momento by key, Delete a stale entry from a Momento cache, Cache an API response inside a Lambda function
Not supported: Does not handle persistent database storage, full-text search, or pub-sub messaging - use for ephemeral key-value caching only.
Jentic publishes the only available OpenAPI specification for Momento Cache HTTP API, keeping it validated and agent-ready. Momento is a serverless cache that exposes a minimal HTTP surface for get, set, and delete operations against named caches, removing the need for a long-lived TCP connection or a Redis-style client library. The HTTP API is purpose-built for serverless and edge runtimes where opening connections is expensive, and it integrates cleanly with Lambda, Cloudflare Workers, and other ephemeral execution environments. It targets engineering teams that want managed caching without the operational cost of running Redis themselves.
Install Jentic One Beta
Connect the Momento Cache HTTP API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Momento Cache HTTP API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fmomentohq.com%2Fmomento-cache-http-api" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fmomentohq.com%2Fmomento-cache-http-api" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Momento Cache HTTP API.
Set cache items in a named Momento cache via HTTP PUT
Get cache items by key from a named Momento cache
Delete cache items by key when the underlying source data changes
Cache responses inside Lambda or Cloudflare Workers without a persistent client connection
Use Momento as a session or rate-limit store for serverless APIs
Use Cases
Patterns agents use Momento Cache HTTP API for, with concrete tasks.
★ Lambda-Friendly API Response Caching
Cache slow API responses inside AWS Lambda or other serverless functions without paying the cost of opening a Redis connection on every cold start. Momento's HTTP API returns cached values via a single GET call and writes via PUT, so a Lambda handler checks the cache, falls through to the upstream call on miss, and writes the response back - all in plain HTTP. Suitable for serverless backends where connection-pool exhaustion or cold-start latency rules out connection-based cache clients.
Inside a Lambda handler, call GET /cache/{cacheName} with the request hash key; on 404, call the upstream, then PUT /cache/{cacheName} with the response body.
Edge-Runtime Session Storage
Store short-lived session tokens or per-user data in Momento from Cloudflare Workers or Vercel Edge Functions where opening a TCP connection is impossible. The HTTP-only surface means the cache works exactly the same way at the edge as in regular cloud functions. Useful for teams adopting edge runtimes for low-latency reads but still needing a shared key-value store.
Call PUT /cache/sessions with the session token under the user's session key; on the next request, GET /cache/sessions retrieves it.
Cache Invalidation on Database Updates
Drop stale cache entries with DELETE whenever the underlying database row changes, so reads served from Momento stay consistent with the source of truth. The minimal HTTP surface means the invalidation logic is one line in any language with an HTTP client. Practical for teams running write-through caching against Postgres or DynamoDB.
On a database update event, call DELETE /cache/{cacheName} with the affected row's key to invalidate the stale cache entry.
Agent-Driven Cache Operations
AI agents that need ephemeral storage between tool calls use Momento through Jentic to set and get intermediate values without holding the bearer token in their context. Jentic's spec is the only structured definition for this HTTP API, so schema-aware agents rely on it for tool selection and parameter shape.
Search Jentic for 'cache a value in a serverless store', load PUT /cache/{cacheName}, and execute with the cache name and key-value pair.
Key Endpoints
3 endpoints — jentic publishes the only available openapi specification for momento cache http api, keeping it validated and agent-ready.
METHOD
PATH
DESCRIPTION
GET
/cache/{cacheName}
Get a cached item by key from a named cache
PUT
/cache/{cacheName}
Set a cached item under a key in a named cache
DELETE
/cache/{cacheName}
Delete a cached item by key from a named cache
GET
/cache/{cacheName}
Get a cached item by key from a named cache
PUT
/cache/{cacheName}
Set a cached item under a key in a named cache
DELETE
/cache/{cacheName}
Delete a cached item by key from a named cache
Jentic AI Readiness Score
This API is usable in Jentic One now. Its AI-readiness score against Jentic's framework shows where it stands today and where improvements would make it even easier for agents to use.
M
Momento Cache HTTP API
- AI-Aware (A-)72/100
100
Foundational Compliance63
Developer Experience & Jentic Compatibility56
AI-Readiness & Agent Experience94
Agent Usability60
Security100
AI DiscoverabilityPowered by JenticScoring Framework 1.0.0 | Scoring Engine 0.4.0
Show dimension breakdown
100
Foundational Compliance
Base layer of spec validity and structural soundness.
Grade: A+Signals: 4
99%
Lint Results
Aggregated quality score from linter diagnostics, weighted by severity.
100%
Resolution Completeness
Percentage of `$ref` references that resolve successfully.
100%
Specification Validity
Checks whether the API description parses successfully and conforms to its declared specification (e.g., OpenAPI).
100%
Structural Integrity
Structural correctness score based on schema issues using logarithmic dampening.
63
Developer Experience & Jentic Compatibility
Clarity, completeness, and ingestion readiness for developers and tooling.
Grade: B-Signals: 4
0%
Example Density
How richly the API is illustrated with examples.
100%
Example Validity
Percentage of examples that conform to their schemas.
50%
Response Coverage
Percentage of operations with complete response definitions (success, client error, server error).
100%
Tooling Readiness
Health of API ingestion, bundling, and resolution within Jentic pipelines.
56
AI-Readiness & Agent Experience
Semantic breadth, depth, and agent comprehension for AI systems.
Grade: CSignals: 4
47%
Description Coverage
Coverage of descriptions across API elements.
0%
Error Standardization
Coverage of RFC 9457 Problem Details for error responses.
100%
OperationId Quality
Coverage, uniqueness, and casing consistency of operationIds for AI inference.
75%
Summary Coverage
Coverage of summaries across operations/tags/info.
94
Agent Usability
Functional utility, complexity comfort, and AI orchestration readiness.
Grade: A+Signals: 1
94%
Complexity Comfort
Agent comfort level based on API operational and structural complexity.
60
Security
Trust, risk posture, and security compliance.
Grade: B-Signals: 1
60%
Authentication Strength
Average quality of security schemes based on authentication method strength (weakest link for OAuth2).
100
AI Discoverability
Findability, semantic richness, and reasoning readiness.
Grade: A+Signals: 1
100%
Descriptive Richness
Clarity and depth of descriptions across API elements.
Score it yourself
Every API in the directory is allowlisted, so you can re-score it with no key required.
npx @jentic/api-scorecard-cli score <openapi-url>Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring the Momento Cache HTTP API by hand means managing its bearer token, targeting the correct regional cell host such as cell-1-us-west-2, and coding the get, set, and delete calls yourself. Through Jentic you install once, import the Momento Cache HTTP API from the API Directory, store the token once, and your agent calls it.
Permission scoping
Momento puts the cache name in the URL path (/cache/{cacheName}), so a rule can pin your agent to one cache. You choose the operations it may call, so a destructive one like deleting a key is not included unless you add it.
Credential isolation
Your Momento token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'cache a value in a serverless store', and Jentic returns the matching Momento GET or PUT operation with its cache-name and key-value schema so the agent calls the right endpoint without browsing the reference docs.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Momento Cache HTTP API through Jentic.
Why is there no official OpenAPI spec for Momento Cache HTTP API?
Momento publishes documentation for the HTTP API but not a structured OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call Momento Cache HTTP API via structured tooling. It is validated against the live API and kept up to date. Get started with Jentic One, the self-hosted execution layer.
What authentication does the Momento Cache HTTP API use?
Momento uses HTTP Bearer authentication. Generate a Momento API token from the console, then send it as Authorization: Bearer <token>. Through Jentic, the token is held encrypted in the credential vault and injected at request time so the secret never enters agent context.
Can I use Momento as a Redis replacement in Lambda?
Yes - and it is purpose-built for that. Because the API is HTTP, there is no connection to manage and no cold-start penalty to pay opening a TCP socket. Call GET /cache/{cacheName} for reads, PUT /cache/{cacheName} for writes, and DELETE /cache/{cacheName} for invalidation, all over standard HTTPS.
What are the rate limits for the Momento Cache HTTP API?
Momento applies per-account throughput and item-size limits documented at https://docs.momentohq.com. The Free Tier covers low-traffic workloads with no card; production usage is metered by data transferred and operations per second.
How do I cache an API response through Jentic?
Run pip install jentic, search for 'cache a value in a serverless store', load PUT /cache/{cacheName}, and execute with the cache name, key, and value. On the next call, use GET /cache/{cacheName} to retrieve it through the same Jentic search-and-load flow.
Does Momento support TTLs on cached items?
Yes. The PUT endpoint accepts a TTL via query parameter or header so cached items expire automatically without separate invalidation calls. Combine TTL-based expiration with explicit DELETE calls for write-through invalidation when source data changes mid-TTL.
Can I limit what my agent is allowed to do with the Momento Cache HTTP API?
Yes. Because you run Jentic One yourself, your own rules decide which Momento operations the agent can call, so you can grant read-only GET /cache/{cacheName} access while withholding the destructive DELETE /cache/{cacheName}. Since the cache name sits in the URL path, you can also pin the agent to a single named cache rather than every cache on the account. The Momento token stays under your control and is injected only for the operations you have allowed.
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