Webhook Relay website screenshot

Webhook Relay

Webhook Relay provides a webhook gateway and forwarding service that enables developers to receive, transform, and reliably deliver webhooks to any destination, including private on‑prem servers, without exposing them to the internet. It offers persistent public URLs, durable retries, scheduling, email‑to‑webhook, custom domains, and a rich CLI, Docker image, and Kubernetes operator. Free tier with no credit card required and paid plans starting at $9.99/month, SOC 2 Type II compliance, and enterprise self‑hosted options.

Webhook Relay publishes 9 API contracts indexed on the APIs.io network, including Buckets API, Domains API, Functions API, and 6 more. Tagged areas include Company, Webhook, API Gateway, Integration, and Developer Tools.

The Webhook Relay catalog on APIs.io includes 1 Spectral governance ruleset.

Webhook Relay’s developer surface includes CLI, authentication, pricing, changelog, engineering blog, getting-started guide, documentation, and 21 more developer resources.

47.9/100 developing ▼ -9.8 Agent 41/100 agent ready Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
AccessFreemiumOpen⚡ Free to try
1 published contract
CompanyWebhookAPI GatewayIntegrationDeveloper Tools

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
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Agent readiness — checks not met, largest first (exact, from this profile):
  • MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
  • Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
  • Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
  • Pagination +5 pts — share of collection GETs (an array, or one wrapped in data/items/results ...) that declare a page/limit/offset/cursor parameter, a Link header or a next/cursor field; na with no collection GETs
5 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/webhook-relay/apis.yml: open an issue on github.com/api-evangelist/webhook-relay to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

measured — observed by APIs.io (verified)
measured — observed by APIs.io (published)
measured — observed by APIs.io (published)

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Webhook Relay API

API for managing tunnels, webhooks, tokens, and functions.

Webhook Relay Buckets API

Input and output grouping. Bucket allows to have multiple endpoints for the same destination or multiple destinations for fan-out style webhook forwarding.

Webhook Relay Domains API

The Domains API from Webhook Relay — 2 operation(s) for domains.

Webhook Relay Functions API

Webhook Relay Functions provide an easy way to extract values from webhooks and transform HTTP requests before passing them to their final destination. Function can be reused by...

Webhook Relay Inputs API

Inputs are your public endpoints. Each input serves as an inbox that you can supply to your webhooks producer (ie: Github, Docker, IFTTT)

Webhook Relay Logs API

Webhook logs hold the status of received and forwarded webhooks. You can use this API group to resend webhooks to one or more destinations

Webhook Relay Outputs API

Outputs are destinations, where your webhooks will be forwarded. Public destinations do not require agents to be running. Internal outputs will not work without an agent.

Webhook Relay Tokens API

Token key & secret pairs are used to authenticate your API calls or for agents to subscribe to webhook forwarding or open tunnels.

Webhook Relay Tunnels API

Tunnels allow remote access to internal web services such as local Wordpress, Jekyll or Hexo. Recommended `crypto` options are `flexible` or `tls-pass-through`.

Scroll for all 9

Webhook Relay API pricing

Prices published by Webhook Relay, read 2026-10-13 from webhookrelay.com/pricing/.

PlanPrice
Free Starter $0.00/month
Basic $8.99/month
Business $71.99/month
Pro $224.99/month
Enterprise Contact Us

Plan details, limits and sources →

Rate limits

Rate-limit details →

Billed by: seat · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

Webhook Relay Rate Limits

1 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

FinOps 1

Cost, billing, and metering signals for API financial operations.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Webhook Relay API Rules

9 rules · 7 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Webhook Relay Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Documentation 2

Reference material describing how the API behaves

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Build 2

SDKs, sample code, and the tooling you integrate with

Access & Security 4

Authentication, authorization, and security posture

Operate 3

Status, limits, changes, and where to get help

Commercial 4

Pricing, plans, and the legal terms of use

Company 2

The organization behind the API

Other 2

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: webhook-relay
name: Webhook Relay
accessModel:
  pricing: freemium
  onboarding: open
  trial: false
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Open access
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://webhookrelay.com/images/og-card.jpg
description: Webhook Relay provides a webhook gateway and forwarding service that enables developers to receive, transform,
  and reliably deliver webhooks to any destination, including private on‑prem servers, without exposing them to the internet.
  It offers persistent public URLs, durable retries, scheduling, email‑to‑webhook, custom domains, and a rich CLI, Docker
  image, and Kubernetes operator. Free tier with no credit card required and paid plans starting at $9.99/month, SOC 2 Type II
  compliance, and enterprise self‑hosted options.
url: https://raw.githubusercontent.com/api-evangelist/webhook-relay/refs/heads/main/apis.yml
x-type: company
x-source: harvest:tag-qc
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-13 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- Company
- Webhook
- API Gateway
- Integration
- Developer Tools
tags_raw:
- Company
- Webhooks
- API Gateway
- Integration
- Developer Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/webhook-relay-rules.yml
- type: Vocabulary
  url: vocabulary/webhook-relay-vocabulary.yml
- type: RateLimits
  url: rate-limits/webhook-relay-rate-limits.yml
- type: Plans
  url: plans/webhook-relay-plans-pricing.yml
- type: DataModel
  url: data-model/webhook-relay-data-model.yml
- type: CLI
  url: cli/webhook-relay-cli.yml
- type: Authentication
  url: authentication/webhook-relay-authentication.yml
- type: ErrorCatalog
  url: errors/webhook-relay-problem-types.yml
- type: Conformance
  url: conformance/webhook-relay-conformance.yml
- type: LLMsTxt
  url: llms/webhook-relay-llms.txt
- type: SecurityTxt
  url: well-known/webhook-relay-my-security.txt
- type: SecurityTxt
  url: well-known/webhook-relay-api-security.txt
- type: WellKnown
  url: well-known/webhook-relay-well-known.yml
- type: Hosts
  url: hosts/webhook-relay-hosts.yml
- type: Vendors
  url: vendors/webhook-relay-vendors.yml
- type: Webhooks
  url: https://webhookrelay.com/webhooks/
- type: TermsOfService
  url: https://webhookrelay.com/tos/
- type: StatusPage
  url: https://status.webhookrelay.com/status
- type: PrivacyPolicy
  url: https://webhookrelay.com/privacy/
- type: Pricing
  url: https://webhookrelay.com/pricing/
- type: GitHubOrganization
  url: https://github.com/webhookrelay
- type: ChangeLog
  url: https://webhookrelay.com/changelog/
- type: Blog
  url: https://webhookrelay.com/blog/
- type: GettingStarted
  url: https://webhookrelay.com/docs/
- type: Documentation
  url: https://docs.webhookrelay.com/
- type: APIReference
  url: https://webhookrelay.com/llms.txt
- type: DomainSecurity
  url: security/webhook-relay-domain-security.yml
- type: Website
  url: https://webhookrelay.com
apis:
- name: Webhook Relay API
  description: API for managing tunnels, webhooks, tokens, and functions.
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  aid: webhook-relay:webhook-relay-api
- aid: webhook-relay:webhook-relay-buckets-api
  name: Webhook Relay Buckets API
  description: Input and output grouping. Bucket allows to have multiple endpoints for the same destination or multiple destinations
    for fan-out style webhook forwarding.
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Buckets
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-buckets-api-openapi.yml
- aid: webhook-relay:webhook-relay-domains-api
  name: Webhook Relay Domains API
  description: The Domains API from Webhook Relay — 2 operation(s) for domains.
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Domains
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-domains-api-openapi.yml
- aid: webhook-relay:webhook-relay-functions-api
  name: Webhook Relay Functions API
  description: "Webhook Relay Functions provide an easy way to extract values from webhooks and transform HTTP \nrequests\
    \ before passing them to their final destination. Function can be reused by any number \nof Inputs and/or Outputs. Since\
    \ user doesn’t have to run a server, this type of function service \nis also known as FaaS (Function as a Service) or\
    \ Serverless. \n\nRead more about functions here: https://webhookrelay.com/docs/webhooks/functions/manipulating-json.\n\
    \nBasic function examples can be found here: https://webhookrelay.com/docs/webhooks/functions/modify-request."
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Functions
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-functions-api-openapi.yml
- aid: webhook-relay:webhook-relay-inputs-api
  name: Webhook Relay Inputs API
  description: 'Inputs are your public endpoints. Each input serves as an inbox that you can supply to your webhooks producer
    (ie: Github, Docker, IFTTT)'
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Inputs
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-inputs-api-openapi.yml
- aid: webhook-relay:webhook-relay-logs-api
  name: Webhook Relay Logs API
  description: Webhook logs hold the status of received and forwarded webhooks. You can use this API group to resend webhooks
    to one or more destinations
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Logs
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-logs-api-openapi.yml
- aid: webhook-relay:webhook-relay-outputs-api
  name: Webhook Relay Outputs API
  description: Outputs are destinations, where your webhooks will be forwarded. Public destinations do not require agents
    to be running. Internal outputs will not work without an agent.
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Outputs
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-outputs-api-openapi.yml
- aid: webhook-relay:webhook-relay-tokens-api
  name: Webhook Relay Tokens API
  description: Token key & secret pairs are used to authenticate your API calls or for agents to subscribe to webhook forwarding
    or open tunnels.
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Tokens
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-tokens-api-openapi.yml
- aid: webhook-relay:webhook-relay-tunnels-api
  name: Webhook Relay Tunnels API
  description: Tunnels allow remote access to internal web services such as local Wordpress, Jekyll or Hexo. Recommended `crypto`
    options are `flexible` or `tls-pass-through`.
  humanURL: https://webhookrelay.com/api-reference/
  baseURL: https://my.webhookrelay.com
  tags:
  - Tunnels
  properties:
  - type: OpenAPI
    url: openapi/webhook-relay-tunnels-api-openapi.yml
x-enrichment:
  date: '2026-10-13'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Webhook Relay API — frequently asked questions

Does Webhook Relay have an API?

Yes. APIs.io lists 9 APIs from Webhook Relay, including Webhook Relay API, Webhook Relay Buckets API and Webhook Relay Domains API, and 6 more.

Is there an OpenAPI specification for the Webhook Relay API?

Yes. APIs.io indexes 8 OpenAPI specifications for Webhook Relay, each linked for download from this page.

How do I authenticate with the Webhook Relay API?

Webhook Relay documents its authentication (1 scheme). The details are profiled on APIs.io as Webhook Relay Authentication.

How much does the Webhook Relay API cost?

Webhook Relay publishes its prices; its Free Starter plan is $0.00/month as of 2026-10-13. APIs.io lists 5 pricing plans for Webhook Relay, with each plan's price, limits and inclusions under Pricing on this page.

Is the Webhook Relay API ready for AI agents?

Webhook Relay has a Kin Score of 47.9 out of 100 (developing) and an Agent Readiness score of 41.1 (agent-ready), scored by API Evangelist on 2026-11-06.

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