Syntropy

Syntropy is an autonomous, agentic coding application built for complex, long-horizon software engineering tasks. A developer describes a feature in natural language and Syntropy plans, writes, and tests the implementation, returning a production-ready pull request without the developer having to manage a terminal or an IDE agent session by hand. The product emphasizes large-context handling for heavy, real-world codebases ("no context ceiling, no truncation"), supports custom Model Context Protocol (MCP) integrations so it can pull in a team's own tools, and joins Slack to post updates as tasks complete. Syntropy is a Y Combinator (Winter 2026) company based in San Francisco, founded by Saahil Sundaresan and Andrew Kuik. As of this profile it ships as a hosted end-user coding product and does not publish a public developer API, SDK, or API documentation.

Syntropy is profiled on the APIs.io network. Tagged areas include Company, Artificial Intelligence, AI Agents, Agentic Coding, and Developer Tools.

Syntropy’s developer surface includes pricing, signup flow, and 4 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

10.7/100 minimal ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

0 APIs

Company Artificial Intelligence AI Agents Agentic Coding Developer Tools Code Generation Software Development Automation MCP

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 10.7/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 6.3 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.8 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/syntropy/apis.yml: open an issue on github.com/api-evangelist/syntropy to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Syntropy API pricing

Prices published by Syntropy, read 2026-10-07 from syntropy.io/plans.

Plan	Price
Starter	$50/mo Includes: Try it out!
Scale	$1,000/mo Includes: For builders shipping fast
Bring Your Own Key	$20/mo Includes: Use your own Anthropic API key
Custom / Enterprise	Custom/mo Includes: Dedicated support & volume pricing

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Syntropy Plans Pricing

4 plans

PLANS

Security Posture 1

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

Syntropy Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: syntropy
name: Syntropy
description: Syntropy is an autonomous, agentic coding application built for complex, long-horizon software engineering tasks.
  A developer describes a feature in natural language and Syntropy plans, writes, and tests the implementation, returning
  a production-ready pull request without the developer having to manage a terminal or an IDE agent session by hand. The product
  emphasizes large-context handling for heavy, real-world codebases ("no context ceiling, no truncation"), supports custom
  Model Context Protocol (MCP) integrations so it can pull in a team's own tools, and joins Slack to post updates as tasks
  complete. Syntropy is a Y Combinator (Winter 2026) company based in San Francisco, founded by Saahil Sundaresan and Andrew
  Kuik. As of this profile it ships as a hosted end-user coding product and does not publish a public developer API, SDK,
  or API documentation.
url: https://raw.githubusercontent.com/api-evangelist/syntropy/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
image: https://syntropy.io/og-image.png
tags:
- Company
- Artificial Intelligence
- AI Agents
- Agentic Coding
- Developer Tools
- Code Generation
- Software Development
- Automation
- MCP
tags_raw:
- Company
- Artificial Intelligence
- AI Agents
- Agentic Coding
- Developer Tools
- Code Generation
- Software Development
- Automation
- Model Context Protocol
apis: []
common:
- type: Pricing
  url: https://syntropy.io/plans
- type: Plans
  url: plans/syntropy-plans-pricing.yml
- type: DomainSecurity
  url: security/syntropy-domain-security.yml
- type: Website
  url: https://syntropy.io/
- type: SignUp
  url: https://syntropy.io/signup
- type: X
  url: https://x.com/Syntropy
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: minimal
  artifacts_added: 1
  pass: local-v1

Syntropy API — frequently asked questions

How much does the Syntropy API cost?

Syntropy publishes its prices; its Starter plan is $50/mo as of 2026-10-07. APIs.io lists 4 pricing plans for Syntropy, with each plan's price, limits and inclusions under Pricing on this page.

Is the Syntropy API ready for AI agents?

Syntropy has a Kin Score of 10.7 out of 100 (minimal) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-06.

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