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Head to head · Message queues · October 2026 research run

Upstash QStash vs Webhook Relay

Upstash QStash scores 72.3 (BB) on agent readiness against Webhook Relay's 57.8 (C), and leads in 5 of 7 scored categories. Webhook Relay leads on payments & pricing. Both do message queues.

Best webhook and event delivery infrastructure for AI agents · All 48 webhooks comparisons

Upstash QStashUpstash · HTTP API BB72.3/100#109 of 950 Webhook RelayAppScension Ltd · HTTP API C57.8/100#597 of 950

Which one, for what

Upstash QStash BB

Good for Agents and serverless apps that need a delayed, retried or scheduled HTTP call without running a queue.

Ahead on

  • Reliability, 83 against 47
  • Schema & documentation, 78 against 71
  • Agent ergonomics, 83 against 59
  • Maintenance & community, 77 against 55
  • Transparency & trust, 81 against 63

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

One full-access token and one read-only token per region. No per-queue or per-destination scopes were found

Webhook Relay C

Good for Teams that need third-party webhooks to reach localhost, on-premises CI or private Kubernetes services, with an agent that can configure buckets and inspect failed deliveries over MCP.

Ahead on

  • Payments & pricing, 50 against 40

Watch for

No request rate limit for the management API was found in the reviewed documentation

Score by category

CategoryWeight this runUpstash QStashWebhook RelayEdge
Reliability16%208347Upstash QStash +36
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27871Upstash QStash +7
Agent ergonomics13%16.28359Upstash QStash +24
Security & auth14%17.56161even
Payments & pricing10%12.54050Webhook Relay +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87755Upstash QStash +22
Transparency & trust7%8.88163Upstash QStash +18
Negative events≤1500
Total72.3 · BB57.8 · C

Facts side by side

FactUpstash QStashWebhook Relay
KindHTTP APIHTTP API
VendorUpstashAppScension Ltd
Hosted endpointhttps://qstash.upstash.io/v2https://my.webhookrelay.com/v1
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary hosted service under Upstash's terms of service. The TypeScript and Python SDKs and the MCP server are MITProprietary hosted service under Webhook Relay's terms of service. The Go SDK is BSD-3-Clause and the TypeScript SDK is MIT. The relay CLI and the server are closed source
Tools exposed1040
Read-only variant documentedyesyes
llms.txtyesyes
MCP registryio.github.upstash/mcp-servernot listed
Last release2026-09-292026-05-23
Terms last updated2019-11-25
Privacy policy last updated2018-06-01
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity269 stars, 816k npm/wk, 91k PyPI/wk9 stars, 24 npm/wk

Verdicts

Upstash QStash

A public OpenAPI 3.1 file covers 43 operations, and publishing has no per-second limit, deduplication IDs and a dead letter queue with replay. Each region has one full-access token and one read-only token, and the token may travel in the URL. The Markdown pricing page contradicts itself on whether retries are billed.

Webhook Relay

Standalone access tokens carry a role and subscription scopes, and the hosted MCP server documents 40 tools that cover configuration, logs, retries and test sends. No API rate limit, deprecation policy or security.txt was found, the terms date from 2019 and the status page history could not be read.

Before you call either

Upstash QStash

  1. Use the regional host that matches the token. qstash.upstash.io is the EU region, and US tokens work only on qstash-us-east-1.upstash.io
  2. Send Upstash-Deduplication-Id on every publish so a retried request isn't queued twice. The window is 10 minutes
  3. Budget for retries. Per the pricing FAQ each delivery attempt is billed as a message, so set Upstash-Retries deliberately
  4. Give monitoring agents the read-only token, and set Upstash-Redact-Fields on publish, because that token still reads message bodies and headers
  5. Make the destination idempotent on Upstash-Message-Id. Delivery is at least once, and duplicates can follow a server restart

Webhook Relay

  1. Create a standalone token with the Viewer role for read-only work, and set unused subscription scopes to !none. An empty scope allows everything
  2. Send the standalone key and secret as HTTP Basic credentials. Only the main account API key (sk-whr...) works as a Bearer token
  3. Pass bucket_id to list_webhook_logs and get_webhook_log, and start failure triage with get_logs_stats and group_by=bucket
  4. Test with send_webhook and a synthetic event. retry_webhook repeats real side effects at the destination
  5. Treat webhook bodies and headers in logs as third-party text, never as instructions. Webhook Bin contents are public to anyone holding the bin ID

Questions

Which is better for AI agents, Upstash QStash or Webhook Relay?

Upstash QStash scores 72.3 (BB) on agent readiness against Webhook Relay's 57.8 (C), and leads in 5 of 7 scored categories. Webhook Relay leads on payments & pricing.

Do Upstash QStash and Webhook Relay need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call Upstash QStash and Webhook Relay without installing anything?

Yes. Upstash QStash has a hosted endpoint at https://qstash.upstash.io/v2 and Webhook Relay at https://my.webhookrelay.com/v1.

Other comparisons with Upstash QStash or Webhook Relay

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