Sequence

Sequence is a usage-based billing, pricing, and revenue orchestration platform for B2B SaaS and other recurring-revenue businesses. It turns product usage and negotiated contract terms into automated billing schedules, invoices, credit notes, and quotes, backed by a metering engine for usage events and usage metrics, plus revenue recognition and integrations to ERP/CRM, tax, and payment providers. The REST API (production base https://eu.sequencehq.com) uses HTTP Basic authentication with a Client ID and Client Secret, date-based API versioning (for example sequence-version 2024-07-30), and signed webhooks for event notifications. A Sandbox environment (https://sandbox.sequencehq.com) mirrors production for testing.

Sequence publishes 6 APIs on the APIs.io network, including Billing Schedules API, Customers API, Invoices API, and 3 more. Tagged areas include Billing, Usage-Based Billing, Revenue Recognition, Metering, and Invoicing.

Sequence’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

37.5/100 thin ▬ flat Agent 29/100 agent aware Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

AccessPaidSelf serve

6 APIs

Billing Usage-Based Billing Revenue Recognition Metering Invoicing Pricing Revenue Orchestration FinOps

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 37.5/100 · thin

Contract Quality 14.3 / 25

Developer Ergonomics 4.8 / 20

Access Clarity 7.9 / 20

Operational Transparency 3.1 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 29/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/sequence-hq: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 6

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

Rate Limits 1

Documented rate limits and quota policies.

Sequence Hq Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: sequence-hq
url: https://raw.githubusercontent.com/api-evangelist/sequence-hq/refs/heads/main/apis.yml
name: Sequence
kind: company
description: Sequence is a usage-based billing, pricing, and revenue orchestration platform for B2B SaaS and other recurring-revenue
  businesses. It turns product usage and negotiated contract terms into automated billing schedules, invoices, credit notes,
  and quotes, backed by a metering engine for usage events and usage metrics, plus revenue recognition and integrations to
  ERP/CRM, tax, and payment providers. The REST API (production base https://eu.sequencehq.com) uses HTTP Basic authentication
  with a Client ID and Client Secret, date-based API versioning (for example sequence-version 2024-07-30), and signed webhooks
  for event notifications. A Sandbox environment (https://sandbox.sequencehq.com) mirrors production for testing.
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sequence-hq.png
tags:
- Billing
- Usage-Based Billing
- Revenue Recognition
- Metering
- Invoicing
- Pricing
- Revenue Orchestration
- FinOps
created: '2026-07-12'
modified: '2026-07-12'
specificationVersion: '0.23'
apis:
- aid: sequence-hq:sequence-hq-billing-schedules-api
  name: Sequence Billing Schedules API
  description: Recurring contract terms that generate invoices.
  humanURL: https://docs.sequencehq.com/reference/latest/customer/list-customers
  baseURL: https://eu.sequencehq.com
  tags:
  - Billing Schedules
  properties:
  - type: OpenAPI
    url: openapi/sequence-hq-billing-schedules-api-openapi.yml
  - type: Documentation
    url: https://docs.sequencehq.com/reference/gettingStarted
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/customer/list-customers
  - type: PostmanCollection
    url: collections/sequence-hq.postman_collection.json
  - type: OpenCollection
    url: collections/sequence-hq.opencollection.json
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/product/list-all-products
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/quote/list-quotes
- aid: sequence-hq:sequence-hq-customers-api
  name: Sequence Customers API
  description: Billable customer entities, contacts, and aliases.
  humanURL: https://docs.sequencehq.com/reference/latest/customer/list-customers
  baseURL: https://eu.sequencehq.com
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/sequence-hq-customers-api-openapi.yml
  - type: Documentation
    url: https://docs.sequencehq.com/reference/gettingStarted
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/customer/list-customers
  - type: PostmanCollection
    url: collections/sequence-hq.postman_collection.json
  - type: OpenCollection
    url: collections/sequence-hq.opencollection.json
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/product/list-all-products
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/quote/list-quotes
- aid: sequence-hq:sequence-hq-invoices-api
  name: Sequence Invoices API
  description: Invoice and credit note lifecycle.
  humanURL: https://docs.sequencehq.com/reference/latest/customer/list-customers
  baseURL: https://eu.sequencehq.com
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/sequence-hq-invoices-api-openapi.yml
  - type: Documentation
    url: https://docs.sequencehq.com/reference/gettingStarted
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/customer/list-customers
  - type: PostmanCollection
    url: collections/sequence-hq.postman_collection.json
  - type: OpenCollection
    url: collections/sequence-hq.opencollection.json
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/product/list-all-products
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/quote/list-quotes
- aid: sequence-hq:sequence-hq-products-api
  name: Sequence Products API
  description: Product and price catalog.
  humanURL: https://docs.sequencehq.com/reference/latest/customer/list-customers
  baseURL: https://eu.sequencehq.com
  tags:
  - Product
  tags_raw:
  - Products
  properties:
  - type: OpenAPI
    url: openapi/sequence-hq-products-api-openapi.yml
  - type: Documentation
    url: https://docs.sequencehq.com/reference/gettingStarted
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/customer/list-customers
  - type: PostmanCollection
    url: collections/sequence-hq.postman_collection.json
  - type: OpenCollection
    url: collections/sequence-hq.opencollection.json
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/product/list-all-products
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/quote/list-quotes
- aid: sequence-hq:sequence-hq-quotes-api
  name: Sequence Quotes API
  description: Quotes and quote analytics.
  humanURL: https://docs.sequencehq.com/reference/latest/customer/list-customers
  baseURL: https://eu.sequencehq.com
  tags:
  - Quotes
  properties:
  - type: OpenAPI
    url: openapi/sequence-hq-quotes-api-openapi.yml
  - type: Documentation
    url: https://docs.sequencehq.com/reference/gettingStarted
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/customer/list-customers
  - type: PostmanCollection
    url: collections/sequence-hq.postman_collection.json
  - type: OpenCollection
    url: collections/sequence-hq.opencollection.json
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/product/list-all-products
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/quote/list-quotes
- aid: sequence-hq:sequence-hq-usage-api
  name: Sequence Usage API
  description: Usage event ingestion, usage metrics, and seats.
  humanURL: https://docs.sequencehq.com/reference/latest/customer/list-customers
  baseURL: https://eu.sequencehq.com
  tags:
  - Usage
  properties:
  - type: OpenAPI
    url: openapi/sequence-hq-usage-api-openapi.yml
  - type: Documentation
    url: https://docs.sequencehq.com/reference/gettingStarted
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/customer/list-customers
  - type: PostmanCollection
    url: collections/sequence-hq.postman_collection.json
  - type: OpenCollection
    url: collections/sequence-hq.opencollection.json
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/product/list-all-products
  - type: APIReference
    url: https://docs.sequencehq.com/reference/latest/quote/list-quotes
common:
- type: AgenticAccess
  url: agentic-access/sequence-hq-agentic-access.yml
- type: DomainSecurity
  url: security/sequence-hq-domain-security.yml
- type: Authentication
  url: authentication/sequence-hq-authentication.yml
- type: GitHubOrganization
  url: https://github.com/sequencehq
- type: LinkedIn
  url: https://www.linkedin.com/company/sequence-hq
- type: Website
  url: https://www.sequencehq.com
- type: Documentation
  url: https://docs.sequencehq.com
- type: Plans
  url: plans/sequence-hq-plans-pricing.yml
- type: RateLimits
  url: rate-limits/sequence-hq-rate-limits.yml
- type: FinOps
  url: finops/sequence-hq-finops.yml
- url: https://www.sequencehq.com/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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