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

24.2/100 emerging ▬ flat Agent 17/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Crypto DeFi Derivatives Perpetuals DEX Trading Blockchain SEI Web3

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 24.2/100 · emerging

Contract Quality 8.9 / 21

Developer Ergonomics 7.2 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 6.5 / 9

Regulatory Posture 3.0 / 15

Agent readiness — 17/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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 github.com/api-evangelist/filament: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

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...

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

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

Security Posture 2

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

Filament Authentication

signature · 1 scheme

SECURITY

Filament Domain Security

TLSv1.3 · HSTS

SECURITY

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

X-MCPServerCandidate

X-MCPServerCandidate

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

BrandKit

BrandKit

Source (apis.yml)

aid: filament
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/filament.png
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: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Crypto
- DeFi
- Derivatives
- Perpetuals
- DEX
- Trading
- Blockchain
- SEI
- Web3
tags_raw:
- 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
  - Order Book
  - Derivatives
  tags_raw:
  - Perpetuals
  - Trading
  - Orderbook
  - Derivatives
  properties:
  - type: Authentication
    url: authentication/filament-authentication.yml
  - type: Conventions
    url: conventions/filament-conventions.yml
  - type: X-MCPServerCandidate
    url: mcp/filament-mcp.yml
    note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list
      derived from the published API contracts, not an existing server. The scorer already read the manifest and reported
      mcp_server correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
  - 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: X-MCPServerCandidate
  url: mcp/filament-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- 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

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