Notional Finance
Notional Finance is a fixed-rate, fixed-term DeFi lending and borrowing protocol built on Ethereum and Arbitrum. The protocol enables users to lend and borrow crypto assets at predetermined interest rates using fCash, a zero-coupon bond instrument that represents a fixed cash flow at maturity. Notional V3 introduced leveraged vaults and expanded yield strategies, making it DeFi's leading fixed-rate lending platform with tenors ranging from three months to twenty years.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles Notional Finance the way a machine reads it — 6 machine-readable artifacts across 4 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Notional Finance scores 12.9/100 (minimal), with a separate agent-readiness read of 0/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Notional Finance
Each block below is one kind of artifact we hold for Notional Finance. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 4
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Notional V2 Subgraph API (Mainnet)
GraphQL subgraph API for querying Notional V2 on-chain data on Ethereum Mainnet via The Graph protocol. Provides access to accounts, trades, markets, nTokens, cash groups, curre...
Notional V3 Subgraph API (Mainnet)
GraphQL subgraph API for querying Notional V3 on-chain data on Ethereum Mainnet via The Graph Studio. Supports queries for accounts, leveraged vault positions, fCash markets, in...
Notional V3 Subgraph API (Arbitrum)
GraphQL subgraph API for querying Notional V3 on-chain data on Arbitrum One via The Graph Studio. Notional V3 launched primarily on Arbitrum and this endpoint provides the most ...
Notional Typescript SDK
Client-side Typescript SDK for interacting with Notional Finance smart contracts. Provides helper methods for computing fixed-rate trade values including getCashAmountGivenfCash...
GraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
Notional Finance GraphQL API
Notional Finance exposes protocol data via GraphQL subgraphs hosted on The Graph protocol. The V2 subgraph covers Ethereum Mainnet fixed-rate lending/borrowing markets, accounts...
GRAPHQLSecurity Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Notional Finance — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 4
Reference material describing how the API behaves
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/notional · machine-readable index on apis.io