# BuildStack.ai

> BuildStack.ai is a B2B directory of webhook architectures and AI agent harnesses, published by AI FUTURE ASIA PTE LTD (Singapore). Launch category: Inbound webhook reliability and payload routing — tools for receiving, queuing, retrying, verifying, transforming, routing and observing inbound webhooks, including for AI agents. 19 listings, facts verified 2026-10-19.

Capabilities are marked yes only when documented by the vendor; 'unknown' means not verified. Prices are as published on the verified date.

## Category pages
- [Inbound webhook reliability and payload routing](https://getbuildstack.ai/): comparison table, listings, reference architecture and FAQ

## Data
- [Dataset JSON](https://getbuildstack.ai/data/webhook-reliability.json): structured listings
- [Dataset CSV](https://getbuildstack.ai/data/webhook-reliability.csv)

## Listings
- [Hookdeck Event Gateway](https://hookdeck.com): Managed event gateway for receiving, verifying, queueing, filtering, transforming and routing inbound webhooks, with full request/event/attempt logs. Type: SaaS. Free tier: Yes: Developer plan $0/month, 10,000 events, 3-day retention, 1 user. Paid: Team from $39/month (pay-as-you-go events); Growth from $499/month; Enterprise custom. Documented capabilities: retries, signature verification, fan-out / routing, transformation, replay, observability, agent / llm integration. GitHub: https://github.com/hookdeck/hookdeck-cli (365 stars as of 2026-10-19).
- [Svix (Ingest + Dispatch)](https://www.svix.com): Webhooks platform: Svix Ingest for receiving webhooks at scale, Dispatch for sending, plus Play for testing; core server is open source. Type: Both. Free tier: Yes: $0/month, up to 50k messages/month, 7-day retention, Ingest included. Paid: Basic from $20/month; Professional from $490/month; Enterprise custom. Documented capabilities: retries, signature verification, fan-out / routing, transformation, replay, observability. GitHub: https://github.com/svix/svix-webhooks (3,453 stars as of 2026-10-19).
- [Convoy](https://getconvoy.io): Cloud-native webhook gateway for sending outgoing and receiving incoming webhooks, self-hosted open source or Convoy Cloud. Type: Both. Free tier: Yes: Community edition, self-hosted, $0 forever; 14-day Premium trial (Cloud trial: 100 events/day). Paid: Premium $999/month (self-hosted); Enterprise contact sales. Documented capabilities: retries, transformation, observability. GitHub: https://github.com/frain-dev/convoy (2,880 stars as of 2026-10-19).
- [WebhookX](https://webhookx.io): Open-source webhook gateway (Go) for receiving, validating, transforming and delivering events at scale, with plugins. Type: Open source. Free tier: Yes: open source; free production licenses for eligible non-commercial use. Paid: unknown (commercial license pricing not published). Documented capabilities: retries, signature verification, fan-out / routing, transformation. GitHub: https://github.com/webhookx-io/webhookx (300 stars as of 2026-10-19).
- [Upstash QStash](https://upstash.com/docs/qstash): Serverless HTTP message queue and scheduler that durably delivers messages to your endpoints with retries, DLQ and URL-group fan-out. Type: SaaS. Free tier: Yes: $0/month, 1,000 messages/day. Paid: Pay-as-you-go $1 per 100K messages; Fixed 1M $180/month; Fixed 10M $420/month; Enterprise custom. Documented capabilities: retries, fan-out / routing, observability. GitHub: https://github.com/upstash/qstash-js (270 stars as of 2026-10-19).
- [Amazon EventBridge](https://aws.amazon.com/eventbridge/): AWS serverless event bus with partner event buses for SaaS events, API destinations for HTTP delivery, Pipes for filter/transform/enrich, and archive & replay. Type: SaaS. Free tier: Partial: AWS management events ingested free; Scheduler free tier 14M invocations/month; Schema Discovery 5M events/month free. Paid: No minimum; e.g. classic custom events $1.00 per million; API destinations $0.20 per million; Pipes $0.40 per million requests (as stated in examples). Documented capabilities: retries, fan-out / routing, transformation, replay.
- [Inngest](https://www.inngest.com): Durable workflow/agent orchestration platform that can receive provider webhooks directly, transform them into events and start durable functions. Type: Both. Free tier: Yes: $0/month, 50k executions, 500k events ingested. Paid: Pro from $99/month; Business from $499/month; Enterprise custom. Documented capabilities: retries, transformation, observability, agent / llm integration. GitHub: https://github.com/inngest/inngest (5,959 stars as of 2026-10-19).
- [Trigger.dev](https://trigger.dev): Open-source platform for durable background tasks and AI agents; Webhooks (private beta) receive provider webhooks on hosted, verified endpoints and route them to tasks, agents and waiting runs. Type: Both. Free tier: Yes: $0/month with $5/month free credits, 20 concurrent runs. Paid: Hobby $10/month; Pro $50/month; Enterprise custom. Documented capabilities: retries, signature verification, observability, agent / llm integration. GitHub: https://github.com/triggerdotdev/trigger.dev (16,570 stars as of 2026-10-19).
- [Hatchet](https://hatchet.run): Open-source orchestration engine for background tasks, AI agents and durable workflows, with webhook endpoints that trigger runs. Type: Both. Free tier: Yes: 1M runs and 1M events free every month. Paid: Pay-as-you-go: $30 per million runs, $5 per million events after free tier; custom plans for 100M+ runs. Documented capabilities: retries, signature verification, observability, agent / llm integration. GitHub: https://github.com/hatchet-dev/hatchet (8,139 stars as of 2026-10-19).
- [ngrok](https://ngrok.com): Ingress/API gateway that gives local or private services public HTTPS endpoints, with traffic inspection, webhook replay and a verify-webhook traffic policy action. Type: SaaS. Free tier: Yes: $0 with $5 one-time usage credit, 3 endpoints, 20k HTTP/S requests. Paid: Hobbyist $10/month; Pay-as-you-go $20/month + usage; Enterprise custom. Documented capabilities: signature verification, replay, observability, agent / llm integration. GitHub: https://github.com/ngrok/ngrok-go (880 stars as of 2026-10-19).
- [Webhook.site](https://webhook.site): Instant unique URLs and email addresses to inspect, test, transform and forward webhooks; Custom Actions add workflows on every hit. Type: Both. Free tier: Yes: free URLs expire after 7 days and accept a limited number of requests. Paid: Basic $9/month; Pro $19/month; Enterprise $69/month (USD, excl. VAT). Documented capabilities: transformation, replay, observability. GitHub: https://github.com/webhooksite/webhook.site (6,775 stars as of 2026-10-19).
- [smee.io](https://smee.io): Free webhook payload delivery service from the Probot team that proxies payloads to your locally running app over Server-Sent Events. Type: Both. Free tier: Yes: free hosted service. Paid: Free. Documented capabilities: n/a. GitHub: https://github.com/probot/smee-client (561 stars as of 2026-10-19).
- [n8n](https://n8n.io): Fair-code workflow automation with Webhook and Respond to Webhook nodes plus native AI agent, MCP and LLM nodes. Type: Both. Free tier: Self-hosted community edition; cloud plans offer free trial. Paid: Starter €20/month billed annually (2.5K executions); Pro €50/month billed annually; Business €667/month billed annually. Documented capabilities: fan-out / routing, transformation, observability, agent / llm integration. GitHub: https://github.com/n8n-io/n8n (207,961 stars as of 2026-10-19).
- [Webhooks by Zapier](https://zapier.com/apps/webhook/integrations): Catch Hook / Catch Raw Hook triggers that give each Zap a unique URL to receive webhooks and route the payload into 9,000+ apps. Type: SaaS. Free tier: Plan-dependent: help center lists webhook triggers on Free, Professional, Team and Enterprise; pricing page lists 'Webhooks' as a Professional feature — confirm. Paid: Professional from $19.99/month; Team from $69/month. Documented capabilities: transformation, replay, agent / llm integration.
- [Pipedream](https://pipedream.com): Integration platform with 3,000+ connectors, prebuilt triggers and MCP servers for adding integrations and event triggers to apps and AI agents. Type: Both. Free tier: Yes: $0, every feature in development (no production). Paid: Startup $99/month billed annually ($150 monthly); Business custom. Documented capabilities: agent / llm integration. GitHub: https://github.com/PipedreamHQ/pipedream (11,752 stars as of 2026-10-19).
- [Windmill](https://www.windmill.dev): Open-source developer platform that auto-generates webhook endpoints for every script and flow, turning scripts into webhooks, workflows and UIs. Type: Both. Free tier: Yes: open source, self-host, unlimited executions. Paid: Enterprise listed 'from $120/mo' (seat-based). Documented capabilities: signature verification, transformation, observability. GitHub: https://github.com/windmill-labs/windmill (18,219 stars as of 2026-10-19).
- [Hook0](https://www.hook0.com): Open-source (SSPL-1.0) webhook server and EU-hosted cloud for providing webhooks to your users, with retries, HMAC signing and delivery logs. Type: Both. Free tier: Yes: Developer plan free forever, up to 100 events/day, 7-day retention. Paid: Startup €59/month; Pro €190/month; dedicated on-prem Pro €1,000 setup + €500/month. Documented capabilities: retries, signature verification, fan-out / routing, observability. GitHub: https://github.com/hook0/hook0 (1,499 stars as of 2026-10-19).
- [Hookdeck Outpost](https://hookdeck.com/outpost): Open-source outbound webhooks and event-destinations infrastructure from Hookdeck, self-hosted or managed. Type: Both. Free tier: Yes: self-hosted always free; managed first 50k events free. Paid: Starter $10 per million events; Growth from $499/month + $10 per million events; Enterprise custom. Documented capabilities: fan-out / routing, observability. GitHub: https://github.com/hookdeck/outpost (1,067 stars as of 2026-10-19).
- [Standard Webhooks](https://www.standardwebhooks.com): Open specification and libraries for sending and verifying webhooks securely and consistently (signatures, timestamps, replay protection). Type: Open source. Free tier: Free (specification + libraries). Paid: Free. Documented capabilities: signature verification. GitHub: https://github.com/standard-webhooks/standard-webhooks (1,776 stars as of 2026-10-19).

## FAQ
- **How do I make inbound webhooks reliable?** Treat every webhook as untrusted, at-least-once input. (1) Verify the signature and timestamp on the raw body before parsing. (2) Acknowledge fast with a 2xx and push the payload to a durable queue or gateway rather than doing work in the request. (3) Process idempotently using the provider's event ID so duplicates are harmless. (4) Retry failures with exponential backoff and send exhausted events to a dead-letter queue. (5) Keep the raw payloads so you can replay after a bug fix. (6) Alert on error rate, latency and backlog. Managed gateways such as Hookdeck, Svix Ingest or Convoy package most of these steps; queues such as Upstash QStash or Amazon EventBridge cover buffering and retries.
- **What is a webhook gateway and do I need one?** A webhook gateway is a service that sits between webhook senders and your application. It receives the HTTP request, verifies it, stores it durably, and delivers it to one or more destinations with retries, rate limits, filtering and logs. You likely need one when you consume webhooks from several providers, cannot afford to lose events during deploys or outages, or need to replay events after a bug.
- **How should I verify webhook signatures?** Compute an HMAC (usually SHA-256) over the exact raw request body (and timestamp, where the provider signs one) with your shared secret, compare it with the signature header in constant time, and reject requests whose timestamp is outside a small tolerance to block replay attacks. The Standard Webhooks specification documents a common scheme. Some gateways (Hookdeck Source Types, ngrok's verify-webhook action, Hatchet HMAC webhooks, WebhookX auth plugins) verify at the edge; note that Inngest's docs state it does not verify provider signatures, so your function must.
- **How do I trigger an AI agent from a webhook without hitting LLM rate limits or timeouts?** Put a queue or gateway in front of the agent. Filter out events the agent does not need, trim payloads before they reach the prompt, cap concurrent deliveries to stay within your model provider's limits, and give the destination a long enough timeout (Hookdeck allows up to 15 minutes). For multi-step or human-in-the-loop work, have the webhook start a durable run in an orchestrator such as Inngest, Trigger.dev or Hatchet, which retry each step independently.
- **Should I build my own webhook infrastructure or buy it?** Build if you receive low volumes from one or two providers: a verified endpoint that writes to a queue you already run (SQS, Redis, Postgres) is enough. Buy or self-host a gateway when you need multi-provider verification, replay, per-tenant rate limits, dashboards and alerting, or compliance artefacts (SOC 2, HIPAA). Open-source options (Svix, Convoy, Hook0, WebhookX, Hookdeck Outpost) let you self-host when data residency matters.
- **What is the difference between inbound and outbound webhook tools?** Inbound (receiving) tools accept webhooks from third parties and deliver them to your systems — e.g. Hookdeck Event Gateway, Svix Ingest, Convoy incoming, ngrok. Outbound (sending) tools help a SaaS vendor deliver webhooks to its own customers with signing, retries and a consumer portal — e.g. Svix Dispatch, Hook0, Hookdeck Outpost, Convoy outgoing. Several vendors offer both.
- **How do I test webhooks locally?** Expose your local server with a tunnel or forwarding CLI: ngrok (with traffic inspection and replay), the Hookdeck CLI, Webhook.site's CLI, or smee.io for GitHub-style development. Replay captured requests instead of re-triggering events at the provider.
- **How much does a managed webhook gateway cost?** Most have free tiers. As published on 2026-10-19: Hookdeck Team from $39/month and Growth from $499/month; Svix Basic from $20/month and Professional from $490/month; Convoy Premium $999/month self-hosted; Hook0 Startup €59/month; Upstash QStash pay-as-you-go $1 per 100K messages. Usage-based charges apply on most plans — check each vendor's pricing page.

## Optional
- [Get featured (USD 500/month)](https://getbuildstack.ai/#get-featured)