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. image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg tags: - Billing - Usage-Based Billing - Revenue Recognition - Metering - Invoicing - Pricing - Revenue Orchestration - FinOps created: '2026-07-12' modified: '2026-07-12' specificationVersion: '0.19' apis: - aid: sequence-hq:sequence-hq-customers-api name: Sequence Customers API tags: - Customers - Contacts - Billing image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg humanURL: https://docs.sequencehq.com/reference/latest/customer/list-customers baseURL: https://eu.sequencehq.com properties: - url: https://docs.sequencehq.com/reference/gettingStarted type: Documentation - url: https://docs.sequencehq.com/reference/latest/customer/list-customers type: APIReference - url: openapi/sequence-hq-openapi.yml type: OpenAPI - url: collections/sequence-hq.postman_collection.json type: PostmanCollection - url: collections/sequence-hq.opencollection.json type: OpenCollection description: Create, retrieve, update, archive, and list customers, along with their contacts, customer aliases (external IDs used to attribute usage), and customer organizations. Customers are the billable entities that billing schedules, invoices, and usage events attach to. - aid: sequence-hq:sequence-hq-usage-metering-api name: Sequence Usage & Metering API tags: - Usage-Based Billing - Metering - Events image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg humanURL: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event baseURL: https://eu.sequencehq.com properties: - url: https://docs.sequencehq.com/reference/latest/usage/create-a-new-usage-event type: APIReference - url: openapi/sequence-hq-openapi.yml type: OpenAPI - url: collections/sequence-hq.postman_collection.json type: PostmanCollection - url: collections/sequence-hq.opencollection.json type: OpenCollection description: Ingest usage events (POST /api/usage-events, rate-limited separately at a higher ceiling) keyed by customerAlias and eventType, define and manage usage metrics that aggregate those events, calculate a metric for a customer over a timeframe, and manage seat metrics and seat events for seat-based billing. This is the metering foundation for usage-based pricing. - aid: sequence-hq:sequence-hq-billing-schedules-api name: Sequence Billing Schedules API tags: - Billing - Subscriptions - Contracts image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg humanURL: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules baseURL: https://eu.sequencehq.com properties: - url: https://docs.sequencehq.com/reference/latest/billing/list-all-billing-schedules type: APIReference - url: openapi/sequence-hq-openapi.yml type: OpenAPI - url: collections/sequence-hq.postman_collection.json type: PostmanCollection - url: collections/sequence-hq.opencollection.json type: OpenCollection description: Create, activate, archive, duplicate, retrieve, update, and list billing schedules - the recurring contract terms that translate a customer's negotiated pricing into automatically generated invoices over time. Includes tax validation on a billing schedule. - aid: sequence-hq:sequence-hq-invoices-credit-notes-api name: Sequence Invoices & Credit Notes API tags: - Invoicing - Credit Notes - Accounts Receivable image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg humanURL: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices baseURL: https://eu.sequencehq.com properties: - url: https://docs.sequencehq.com/reference/latest/invoices/list-all-invoices type: APIReference - url: openapi/sequence-hq-openapi.yml type: OpenAPI - url: collections/sequence-hq.postman_collection.json type: PostmanCollection - url: collections/sequence-hq.opencollection.json type: OpenCollection description: Manage the accounts-receivable lifecycle - create, retrieve, update, patch, finalize, send, void, and delete invoices, manage line items and line item groups, download invoice PDFs, and issue credit notes against invoices. Covers draft-to-sent transitions, payment reminders, and payment status updates. - aid: sequence-hq:sequence-hq-products-prices-api name: Sequence Products & Prices API tags: - Pricing - Products - Catalog image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg humanURL: https://docs.sequencehq.com/reference/latest/product/list-all-products baseURL: https://eu.sequencehq.com properties: - url: https://docs.sequencehq.com/reference/latest/product/list-all-products type: APIReference - url: openapi/sequence-hq-openapi.yml type: OpenAPI - url: collections/sequence-hq.postman_collection.json type: PostmanCollection - url: collections/sequence-hq.opencollection.json type: OpenCollection description: Manage the product and pricing catalog - create, retrieve, update, and archive products; create, retrieve, update, and delete prices; and manage reusable list prices. Pricing models support flat, per-unit, tiered, and usage-based structures that feed billing schedules and quotes. - aid: sequence-hq:sequence-hq-quotes-api name: Sequence Quotes API tags: - Quotes - CPQ - Revenue Orchestration image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg humanURL: https://docs.sequencehq.com/reference/latest/quote/list-quotes baseURL: https://eu.sequencehq.com properties: - url: https://docs.sequencehq.com/reference/latest/quote/list-quotes type: APIReference - url: openapi/sequence-hq-openapi.yml type: OpenAPI - url: collections/sequence-hq.postman_collection.json type: PostmanCollection - url: collections/sequence-hq.opencollection.json type: OpenCollection description: List quotes, retrieve quote analytics, and download quote PDFs. Quotes capture negotiated deal terms (products, prices, discounts) that, once signed and accepted, convert into billing schedules - the quote-to-revenue path for sales-led usage-based businesses. 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