# Sequence

**Canonical:** https://apis.io/providers/sequence-hq/  
**Website:** https://www.sequencehq.com  
**APIs profiled:** 6

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.

## Kin Score — 37.5 / 100 (thin)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 37.5).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 57.3 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 23.7 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

## Agent readiness — 29.1 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Paid · Self-serve signup — onboarding: self-serve, pricing: paid, trial: no (confidence: high).

## APIs (6)

- **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.

## Agentic access (1)

- **Sequence Hq Agentic Access** — 20 operations · 9 acting

## Security (2)

- **Sequence Hq Authentication** — http · 1 scheme
- **Sequence Hq Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **Sequence Hq Plans Pricing**

## Tags

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

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/sequence-hq/). Scores are computed from the provider's own public artifacts under a published rubric.