Sequence website screenshot

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 API contracts indexed 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.

The Sequence catalog on APIs.io includes 1 Spectral governance ruleset.

Sequence’s developer surface includes authentication, documentation, engineering blog, and 9 more developer resources.

🌐 Visit website📡 Profile data on GitHub
15.3/100 emerging ▬ flat Agent 42/100 agent ready Front door AI 3/6 light Heartbeat 2/100 dormant saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →
AccessPaid
1 published contract 1 MCP Servers
BillingUsage-Based BillingRevenue RecognitionMeteringInvoicingPricingRevenue OrchestrationFinOps

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Subscription Billing & Revenue Management
BC-4250
Billing SchedulesInvoicesUsage
POST /invoices POST /invoices/{id}/finalize POST /api/usage-events POST /usage-metrics
Customer Relationship Management
BC-420
Customers
POST /customers PUT /customers/{id}

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0
Composite quality — 15.3/100 · emerging
Contract Quality 0.0 / 19
Developer Ergonomics 4.8 / 15
Access Clarity 1.0 / 15
Operational Transparency 0.9 / 10
Contract Governance 1.2 / 9
Discoverability 5.1 / 8
Regulatory Posture 0.9 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 42/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 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
Delegated User Identity 6 / 6
Protected Resource Metadata 5 / 5
Registration Without a Human 6 / 6
Agentic Commerce Well-Known Document 0 / 5
Pagination 0 / 5
Distinct Operations 3 / 3
MCP Tool Quality 6 / 6
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/.
Show this score on your site. Kin Score badge preview for Sequence It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/sequence-hq/"><img src="https://apis.io/badge/sequence-hq/card.svg" alt="Sequence on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
6 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.
Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →
Ask about:
Sequence Hq · a person reads this and replies by email.
or email info@apis.io
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/sequence-hq/apis.yml: open an issue on github.com/api-evangelist/sequence-hq 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

MarketPositionDepthRegistered MCP serverDeclares compatibility
Billing, Subscriptions and Monetization standard 17.2 (thin) - -

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 4

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.

Model Context Protocol (MCP)
measured — observed by APIs.io (verified)
OAuth 2.0 Protected Resource Metadata
measured — observed by APIs.io (verified)
Dynamic Client Registration
measured — observed by APIs.io (published)
OpenAPI
measured — observed by APIs.io (published)

APIs 6

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

Sequence Billing Schedules API

Recurring contract terms that generate invoices.

Sequence Customers API

Billable customer entities, contacts, and aliases.

Sequence Invoices API

Invoice and credit note lifecycle.

Sequence Products API

Product and price catalog.

Sequence Quotes API

Quotes and quote analytics.

Sequence Usage API

Usage event ingestion, usage metrics, and seats.

Open Collections 7

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Sequence Billing Schedules API

OPEN COLLECTION

Sequence Billing Schedules Customers API

OPEN COLLECTION

Sequence Billing Schedules Invoices API

OPEN COLLECTION

Sequence Billing Schedules Products API

OPEN COLLECTION

Sequence Billing Schedules Quotes API

OPEN COLLECTION

Sequence Billing Schedules Usage API

OPEN COLLECTION

Sequence API

OPEN COLLECTION

Scroll for all 7

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Sequence MCP Server

Remote MCP server at eu.sequencehq.com over HTTP.

MCP SERVER

Sequence API pricing

Not yet checked against Sequence's own pricing page. Compiled by API Evangelist on 2026-07-12 from www.sequencehq.com/pricing; confirm before you rely on a figure.

PlanPrice
Growth flat —
Core flat —
Scale enterprise —

Plan details, limits and sources →

Rate limits

Compiled by API Evangelist, not yet checked against Sequence's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Sequence Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sequence Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Sequence Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Sequence API Rules

67 rules · 59 error-severity 2 warn-severity 6 info-severity

SPECTRAL

Security Posture 2

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

Sequence Authentication

http · 1 scheme

SECURITY

Sequence Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Sequence Agentic Access

20 operations · 9 acting

20 operations · 9 acting

AGENTIC

Resources

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
LinkedIn
 Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap

Source (apis.yml)

apis.yml Raw ↑ 
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.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sequence-hq.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
x-docs-hosting: vercel
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: CapabilityMap
  url: capabilities/sequence-hq-capability-edges.yml
  name: Sequence Business Capability Map
- 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

Sequence API — frequently asked questions

Does Sequence have an API?

Yes. APIs.io lists 6 APIs from Sequence, including Sequence Billing Schedules API, Sequence Customers API and Sequence Invoices API, and 3 more.

Is there an OpenAPI specification for the Sequence API?

Yes. APIs.io indexes 6 OpenAPI specifications for Sequence, each linked for download from this page.

How do I authenticate with the Sequence API?

Sequence documents its authentication (http · 1 scheme). The details are profiled on APIs.io as Sequence Authentication.

How much does the Sequence API cost?

APIs.io lists 3 pricing plans for Sequence, with each plan's price, limits and inclusions under Pricing on this page.

Does Sequence have an MCP server?

Yes. APIs.io lists 1 MCP server for Sequence: Remote MCP server at eu.sequencehq.com over HTTP.

Is the Sequence API ready for AI agents?

Sequence has a Kin Score of 15.3 out of 100 (emerging) and an Agent Readiness score of 42.4 (agent-ready), scored by API Evangelist on 2026-11-13.

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  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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