Filament

Filament (Filament Finance) is a hybrid on-chain perpetual / derivatives DEX built on the Sei Network. It pairs an off-chain orderbook with a Compartment-Based (COMB) liquidity pool to deliver deep liquidity even in thin markets, offering up to 30x leverage on crypto perpetuals using USDC collateral and oracle-based mark prices. Filament Pro is the flagship trading platform, and the project exposes a signature-authenticated REST + WebSocket order-book API at orderbook.filament.finance for market makers and programmatic traders. The team draws on experience from Goldman Sachs, BlackRock, Persistence, and Nethermind; the protocol's smart contracts were audited by PeckShield. Added to the API Evangelist network as a portfolio-lead stub and enriched from the provider's public documentation.

Filament publishes 1 API on the APIs.io network. Tagged areas include Company, Crypto, DeFi, Derivatives, and Perpetuals.

The Filament catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Filament’s developer surface includes documentation, API reference, getting-started guide, engineering blog, sandbox, authentication, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub
29.6/100 emerging ▬ flat Agent 32/100 agent aware Full breakdown ↓
scored 2026-07-21 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyCryptoDeFiDerivativesPerpetualsDEXTradingBlockchainSeiWeb3

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-21 · rubric v0.4
Composite quality — 29.6/100 · emerging
Contract Quality 7.0 / 25
Developer Ergonomics 13.9 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 8.8 / 10
Agent readiness — 32/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
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/filament: 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

Filament API

Signature-authenticated REST + WebSocket order-book API for the Filament perpetual DEX on Sei. Place limit/market orders, cancel orders, manage isolated collateral, set TP/SL, r...

MCP Servers

filament-mcp.yml

MCP SERVER

Event Specifications

Filament Orderbook Streaming API

Real-time WebSocket streams for the Filament perpetual DEX on Sei: order-book state, live asset price feed, and per-account order updates.

ASYNCAPI

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 Sandbox
Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 AsyncAPI
AsyncAPI

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Lifecycle
Lifecycle
 DataModel
DataModel

Access & Security 3

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity
 SecurityAudit
SecurityAudit

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

X
X
 BrandKit
BrandKit

Source (apis.yml)

apis.yml Raw ↑ 
aid: filament
name: Filament
description: Filament (Filament Finance) is a hybrid on-chain perpetual / derivatives DEX built on the Sei Network. It pairs
  an off-chain orderbook with a Compartment-Based (COMB) liquidity pool to deliver deep liquidity even in thin markets, offering
  up to 30x leverage on crypto perpetuals using USDC collateral and oracle-based mark prices. Filament Pro is the flagship
  trading platform, and the project exposes a signature-authenticated REST + WebSocket order-book API at orderbook.filament.finance
  for market makers and programmatic traders. The team draws on experience from Goldman Sachs, BlackRock, Persistence, and
  Nethermind; the protocol's smart contracts were audited by PeckShield. Added to the API Evangelist network as a portfolio-lead
  stub and enriched from the provider's public documentation.
url: https://raw.githubusercontent.com/api-evangelist/filament/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- pantera-capital
x-tier: stub
x-tier-reason: portfolio-lead
x-chain: sei
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Crypto
- DeFi
- Derivatives
- Perpetuals
- DEX
- Trading
- Blockchain
- Sei
- Web3
apis:
- name: Filament API
  description: Signature-authenticated REST + WebSocket order-book API for the Filament perpetual DEX on Sei. Place limit/market
    orders, cancel orders, manage isolated collateral, set TP/SL, read tradable assets with mark/spot/funding, and stream
    order-book state and order updates over WebSocket. Orders are authenticated by signing the order id with an ethers.js
    wallet (no API keys).
  humanURL: https://docs.filament.finance/market-makers/filament-api
  baseURL: https://orderbook.filament.finance/sei
  tags:
  - Perpetuals
  - Trading
  - Orderbook
  - Derivatives
  properties:
  - type: Authentication
    url: authentication/filament-authentication.yml
  - type: Conventions
    url: conventions/filament-conventions.yml
  - type: MCPServer
    url: mcp/filament-mcp.yml
  - type: AsyncAPI
    url: asyncapi/filament-orderbook-asyncapi.yml
  - type: Lifecycle
    url: lifecycle/filament-lifecycle.yml
  - type: DataModel
    url: data-model/filament-data-model.yml
  - type: AgentSkill
    url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://filament.finance/
- type: DeveloperPortal
  url: https://docs.filament.finance/
- type: Documentation
  url: https://docs.filament.finance/
- type: APIReference
  url: https://docs.filament.finance/market-makers/filament-api
- type: GettingStarted
  url: https://docs.filament.finance/guides/trading
- type: Blog
  url: https://medium.com/@filament.finance
- type: X
  url: https://twitter.com/FilamentFinance
- type: Sandbox
  url: sandbox/filament-sandbox.yml
- type: Authentication
  url: authentication/filament-authentication.yml
- type: Conventions
  url: conventions/filament-conventions.yml
- type: MCPServer
  url: mcp/filament-mcp.yml
- type: AsyncAPI
  url: asyncapi/filament-orderbook-asyncapi.yml
- type: Lifecycle
  url: lifecycle/filament-lifecycle.yml
- type: DataModel
  url: data-model/filament-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/filament-llms.txt
- type: DomainSecurity
  url: security/filament-domain-security.yml
- type: SecurityAudit
  url: https://docs.filament.finance/resources/security-audits
- type: BrandKit
  url: https://docs.filament.finance/resources/brand-kit
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence