# Sequence

**Canonical:** https://apis.io/providers/sequence/  
**Website:** https://sequence.xyz  
**APIs profiled:** 5

Sequence is a web3 developer platform (0xsequence, now part of Polygon Labs) for building blockchain applications: smart-contract wallets, a universal crypto payments and swap layer, a real-time multi-chain Indexer with balances, token prices, contract events and webhooks, plus Metadata, Marketplace, Transactions (Relayer) and Analytics APIs. Its backend APIs are webrpc-generated (POST /rpc/{Service}/{Method}) authenticated with a project access key and secret JWT, and it ships first-party SDKs for TypeScript, Go, Unity, Unreal, Kotlin and Swift plus a CLI. Backed by a16z and Polychain.

## Kin Score — 42.4 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 42.4).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 55.1 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 42.1 |
| Developer Ergonomics | 58.9 |
| Commercial Clarity | 10.5 |
| Access Clarity | 10.5 |

Regulatory layer — **Payments**: 26.6 (matched via tags).

## Agent readiness — 32.7 (agent-aware)

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

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (5)

- **Sequence Analytics API** — The Analytics API from Sequence — 177 operation(s) for analytics.
- **Sequence Marketplace API** — The Marketplace API from Sequence — 34 operation(s) for marketplace.
- **Sequence public API** — Endpoints accessible by passing your project-access-key in the header. This is injected whenever you login automatically.
- **Sequence Rpc API** — The Rpc API from Sequence — 32 operation(s) for rpc.
- **Sequence secret API** — Endpoints that require a Sequence service token intended to be secret. You can manually generate one on Sequence Builder and pass it as a Bearer Token.

## MCP servers (1)

- **Sequence MCP Server**

## Security (2)

- **Sequence Authentication** — apiKey/http · 2 schemes
- **Sequence Domain Security** — TLSv1.3 · DMARC

## Tags

Company, Web3, Blockchain, Wallets, Payments, Crypto, Indexer, NFT, Developer Platform, Gaming

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