Braintrust
Braintrust (braintrust.dev) is an end-to-end platform for building, evaluating, and observing AI applications. Its REST API at api.braintrust.dev exposes projects, experiments, datasets, logs/spans, prompts, functions and scorers, evals, and full organization/ACL management, plus an OpenAI-compatible AI proxy, all authenticated with a Bearer API key.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Braintrust the way a machine reads it — 21 machine-readable artifacts across 12 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 — Braintrust scores 46.4/100 (developing), with a separate agent-readiness read of 54/100 (agent ready). 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 Braintrust
Each block below is one kind of artifact we hold for Braintrust. 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 12
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.
Braintrust ACL API
The ACL API from Braintrust — 4 operation(s) for acl.
Braintrust AI Proxy API
The AI Proxy API from Braintrust — 3 operation(s) for ai proxy.
Braintrust Credentials API
The Credentials API from Braintrust — 3 operation(s) for credentials.
Braintrust Datasets API
The Datasets API from Braintrust — 6 operation(s) for datasets.
Braintrust Evals API
The Evals API from Braintrust — 1 operation(s) for evals.
Braintrust Experiments API
The Experiments API from Braintrust — 6 operation(s) for experiments.
Braintrust Functions API
The Functions API from Braintrust — 3 operation(s) for functions.
Braintrust Logs API
The Logs API from Braintrust — 3 operation(s) for logs.
Braintrust Organization API
The Organization API from Braintrust — 3 operation(s) for organization.
Braintrust Project Configuration API
The Project Configuration API from Braintrust — 4 operation(s) for project configuration.
Braintrust Projects API
The Projects API from Braintrust — 2 operation(s) for projects.
Braintrust Prompts API
The Prompts API from Braintrust — 2 operation(s) for prompts.
Scroll within the panel for all 12 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Braintrust REST API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Braintrust Data Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Braintrust Data Finops
FINOPSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Braintrust Streaming (SSE) API
AsyncAPI description of Braintrust's documented HTTP Server-Sent Events (SSE) streams. Braintrust does NOT expose a WebSocket API. Streaming is delivered as one-way HTTP SSE ove...
ASYNCAPISpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Braintrust API Rules
SPECTRALSecurity Posture 2
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.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Braintrust — 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 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/braintrust-data · machine-readable index on apis.io