Paperplane
Paperplane is an AI sales-productivity tool (Y Combinator W23, backed by Bloomberg Beta) that automatically takes notes on sales calls and keeps a rep's CRM up to date. It connects to a team's calendar and to conversational intelligence and call-recording tools such as Gong and Chorus, transcribes and analyzes each call, then writes the results back to Salesforce — updating opportunity fields, notes, and action items so sales teams spend less time on manual CRM data entry and stay on top of their deals. The product is organized around opportunities, calls, and notes, with integrations for Google Calendar, Gong, Chorus, and Salesforce. Paperplane appears to have wound down: Y Combinator lists the company as Inactive (and now describes it as a credit risk management platform for builders' merchants, so it pivoted at least once before stopping), its marketing site presents no TLS certificate, its application host returns a Vercel 402 DEPLOYMENT_DISABLED, and its API host is an Envoy ingress that 404s every path with an empty body. Two surfaces remain live: a GitBook documentation site — which is an unfilled starter template carrying GitBook's own placeholder copy, last updated three years ago — with an llms.txt index, and a Clerk-hosted OpenID Connect identity instance at clerk.paperplane.ai that still serves real OIDC and RFC 8414 discovery documents. There is no public developer API, OpenAPI definition, SDK, MCP server, or agent card.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Paperplane the way a machine reads it — 5 machine-readable artifacts, 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 — Paperplane scores 14.6/100 (emerging), with a separate agent-readiness read of 5/100 (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.
Why this profile is thin
Paperplane has wound down — Y Combinator lists the W23 company as Inactive, app.paperplane.ai returns Vercel 402 DEPLOYMENT_DISABLED, api.paperplane.ai is an Envoy ingress that 404s every path with an empty body, and www.paperplane.ai presents no TLS certificate at all; the only live surfaces are a never-completed GitBook template (still carrying GitBook's own placeholder copy) and a Clerk OIDC instance at clerk.paperplane.ai.
This is an honest zero, not a gap in our research. Paperplane does not appear to expose an API, so there is nothing here for us to index and nothing for them to fix.
What we probed
https://www.ycombinator.com/companies/paperplane→ HTTP 200https://app.paperplane.ai/→ HTTP 402https://api.paperplane.ai/openapi.json→ HTTP 404https://www.paperplane.ai/→ HTTP 0https://clerk.paperplane.ai/.well-known/openid-configuration→ HTTP 200
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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
Put this on your own site. The badge is drawn live from Paperplane's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/paperplane/"
title="Paperplane on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/paperplane.svg"
alt="Paperplane Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/paperplane/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/paperplane/"
title="Paperplane on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/paperplane/card.svg"
alt="Paperplane Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Paperplane
Each block below is one kind of artifact we hold for Paperplane. 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.
Pricing 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 things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
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.
Paperplane Rate Limits
RATE LIMITSSecurity 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.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Resources
Every other property we hold for Paperplane — 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.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Access & Security 3
Authentication, authorization, and security posture
Company 1
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/paperplane · machine-readable index on apis.io
This is an independent, third-party profile of Paperplane, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.