Fastino Labs

Fastino Labs is an applied research lab building production-ready small language models (SLMs) for agentic AI — structured data extraction, classification, PII detection, and safety moderation. Its Pioneer platform is an agentic fine-tuning and inference API that lets teams generate synthetic training data, fine-tune GLiNER encoder models and open-source decoder LLMs (Qwen, Llama, DeepSeek, Gemma), evaluate them against labeled datasets, and serve inference through native, OpenAI-compatible, and Anthropic-compatible endpoints. Fastino also maintains the open-source GLiNER2 schema-based information-extraction model and the GLiGuard safety-moderation model.

Fastino Labs publishes 1 API on the APIs.io network: Pioneer Inference API. Tagged areas include Company, Artificial Intelligence, Machine Learning, Small Language Models, and Fine-Tuning.

Fastino Labs’ developer surface includes documentation, API reference, getting-started guide, pricing, signup flow, support, engineering blog, and 25 more developer resources.

🌐 Visit website 📡 Source on GitHub
47.8/100 developing Agent 79/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyArtificial IntelligenceMachine LearningSmall Language ModelsFine-TuningInferenceNamed Entity RecognitionInformation ExtractionLLMAgentsPII DetectionModel Training

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 47.8/100 · developing
Contract Quality 9.4 / 25
Developer Ergonomics 16.1 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 4.1 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 79/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 3 / 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/fastino-labs: 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

Pioneer Inference API

Pioneer's REST API for running inference against fine-tuned and base small language models. Native schema-based inference (NER, classification, structured extraction, generation...

MCP Servers

fastino-labs-mcp.yml

MCP SERVER

Rate Limits

Fastino Labs Rate Limits

0 limits

RATE LIMITS

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 AgenticAccess
AgenticAccess
 AgentSkill
AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 Lifecycle
Lifecycle
 Conformance
Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 6

Authentication, authorization, and security posture

Authentication
Authentication
 OAuthScopes
OAuthScopes
 SecurityTxt
SecurityTxt
 DomainSecurity
DomainSecurity
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 RateLimits
RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: fastino-labs
name: Fastino Labs
description: Fastino Labs is an applied research lab building production-ready small language models (SLMs) for agentic AI
  — structured data extraction, classification, PII detection, and safety moderation. Its Pioneer platform is an agentic fine-tuning
  and inference API that lets teams generate synthetic training data, fine-tune GLiNER encoder models and open-source decoder
  LLMs (Qwen, Llama, DeepSeek, Gemma), evaluate them against labeled datasets, and serve inference through native, OpenAI-compatible,
  and Anthropic-compatible endpoints. Fastino also maintains the open-source GLiNER2 schema-based information-extraction model
  and the GLiGuard safety-moderation model.
image: https://raw.githubusercontent.com/fastino-ai/mintlify-docs/main/images/pioneer-wordmark-dark.svg
url: https://raw.githubusercontent.com/api-evangelist/fastino-labs/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- insight-partners
x-tier: enriched
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Artificial Intelligence
- Machine Learning
- Small Language Models
- Fine-Tuning
- Inference
- Named Entity Recognition
- Information Extraction
- LLM
- Agents
- PII Detection
- Model Training
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Pioneer Inference API
  description: Pioneer's REST API for running inference against fine-tuned and base small language models. Native schema-based
    inference (NER, classification, structured extraction, generation) plus drop-in OpenAI-compatible (/v1/chat/completions,
    /v1/completions, /v1/models) and Anthropic-compatible (/v1/messages) endpoints, and inference history + feedback.
  humanURL: https://docs.pioneer.ai/api-reference
  baseURL: https://api.pioneer.ai
  tags:
  - Inference
  - Small Language Models
  - OpenAI-Compatible
  - Anthropic-Compatible
  properties:
  - type: OpenAPI
    url: openapi/pioneer-openapi-original.json
  - type: Overlay
    url: overlays/fastino-labs-pioneer-overlay.yaml
  - type: Authentication
    url: authentication/fastino-labs-authentication.yml
  - type: OAuthScopes
    url: scopes/fastino-labs-scopes.yml
  - type: ErrorCatalog
    url: errors/fastino-labs-error-codes.yml
  - type: Conventions
    url: conventions/fastino-labs-conventions.yml
  - type: DataModel
    url: data-model/fastino-labs-data-model.yml
  - type: RateLimits
    url: rate-limits/fastino-labs-rate-limits.yml
  - type: AgenticAccess
    url: agentic-access/fastino-labs-agentic-access.yml
common:
- type: Website
  url: https://www.fastino.ai/
- type: DeveloperPortal
  url: https://docs.pioneer.ai
- type: Documentation
  url: https://docs.pioneer.ai
- type: APIReference
  url: https://docs.pioneer.ai/api-reference
- type: GettingStarted
  url: https://docs.pioneer.ai/quickstart
- type: Pricing
  url: https://docs.pioneer.ai/pricing
- type: SignUp
  url: https://agent.pioneer.ai
- type: Support
  url: https://discord.gg/e99x4szUYS
- type: Blog
  url: https://www.fastino.ai/blog
- type: GitHubOrganization
  url: https://github.com/fastino-ai
- type: StatusPage
  url: https://pioneerai.statuspage.io
- type: TermsOfService
  url: https://agent.pioneer.ai/terms
- type: PrivacyPolicy
  url: https://agent.pioneer.ai/privacy
- type: Authentication
  url: authentication/fastino-labs-authentication.yml
- type: OAuthScopes
  url: scopes/fastino-labs-scopes.yml
- type: Packages
  url: packages/fastino-labs-packages.yml
- type: SDKs
  url: packages/fastino-labs-packages.yml
- type: CLI
  url: cli/fastino-labs-cli.yml
- type: MCPServer
  url: mcp/fastino-labs-mcp.yml
- type: LLMsTxt
  url: llms/fastino-labs-llms.txt
- type: WellKnown
  url: well-known/fastino-labs-well-known.yml
- type: SecurityTxt
  url: well-known/fastino-labs-security.txt
- type: RateLimits
  url: rate-limits/fastino-labs-rate-limits.yml
- type: ErrorCatalog
  url: errors/fastino-labs-error-codes.yml
- type: Conventions
  url: conventions/fastino-labs-conventions.yml
- type: Lifecycle
  url: lifecycle/fastino-labs-lifecycle.yml
- type: Conformance
  url: conformance/fastino-labs-conformance.yml
- type: DomainSecurity
  url: security/fastino-labs-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/fastino-labs-vulnerability-disclosure.yml
- type: Security
  url: https://fastino.ai/.well-known/security.txt
- type: AgenticAccess
  url: agentic-access/fastino-labs-agentic-access.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence