Topl

Topl was an impact-technology company founded in 2017 out of Rice University and based in Houston, Texas, building a proof-of-stake blockchain that let organizations prove ethical and sustainable practices on-ledger. It raised a $3M seed in 2020 and a $15M Series A in 2022, and shipped a real developer platform: the Bifrost node, the Genus indexer, the Brambl SDK family for Scala, TypeScript, JavaScript and Dart, and the brambl-cli client. In late 2023 the company rebranded to Apparatus and repositioned around Thunder, a Bitcoin Layer 2. It appears to have wound down after that — the last first-party artifact of any kind shipped on 2024-09-26, all ten remaining public repositories are archived, every documentation and API host now fails to resolve, and the topl.co domain lapsed and was re-registered by an unrelated owner on 2024-12-30. What survives, and what this profile is built from, is the contract itself: a 38-file proto3 module defining 6 gRPC services, 30 RPCs and 138 messages, still downloadable from the Buf Schema Registry, plus the published SDKs and container images.

Topl is listed with 1 API on the APIs.io network. Tagged areas include Company, Blockchain, Distributed Ledger, gRPC, and Protobuf.

Topl’s developer surface includes documentation, CLI, authentication, changelog, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

0.0/100 minimal ▬ flat Agent 0/100 human only Heartbeat 0/100 dormant Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessOpen

1 API

Company Blockchain Distributed Ledger gRPC Protobuf Web3 Proof of Stake Sustainability Impact TokenizationWound DownDefunct

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 0.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 0.0 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/topl/"><img src="https://apis.io/badge/topl/card.svg" alt="Topl on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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

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
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

10 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
Access Clarity scores 0.0 — up to +20.0 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/topl/apis.yml: open an issue on github.com/api-evangelist/topl 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Stablecoins and Tokenization (stablecoin issuers, tokenized assets)	undeclared	-	-	-
LF Decentralized Trust (Hyperledger) Members and Projects (enterprise blockchain, digital identity, CBDC)	undeclared	-	-	-
Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

gRPC

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

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Apparatus (Topl) Node and Genus gRPC API

The gRPC interface to the Apparatus (Topl) blockchain: NodeRpc on the Bifrost full node for submitting transactions, reading blocks and following the chain tip, and the Genus in...

Pricing Plans 1

Published pricing tiers and plan structures.

Topl Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Topl Rate Limits

0 limits

RATE LIMITS

Security Posture 1

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

Topl Authentication

0 schemes

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

DataModel

Conformance

Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 1

Authentication, authorization, and security posture

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 1

Pricing, plans, and the legal terms of use

Plans

Plans

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Protobuf

Protobuf

Source (apis.yml)

aid: topl
name: Topl
description: 'Topl was an impact-technology company founded in 2017 out of Rice University and based in Houston, Texas, building
  a proof-of-stake blockchain that let organizations prove ethical and sustainable practices on-ledger. It raised a $3M seed
  in 2020 and a $15M Series A in 2022, and shipped a real developer platform: the Bifrost node, the Genus indexer, the Brambl
  SDK family for Scala, TypeScript, JavaScript and Dart, and the brambl-cli client. In late 2023 the company rebranded to
  Apparatus and repositioned around Thunder, a Bitcoin Layer 2. It appears to have wound down after that — the last first-party
  artifact of any kind shipped on 2024-09-26, all ten remaining public repositories are archived, every documentation and
  API host now fails to resolve, and the topl.co domain lapsed and was re-registered by an unrelated owner on 2024-12-30.
  What survives, and what this profile is built from, is the contract itself: a 38-file proto3 module defining 6 gRPC services,
  30 RPCs and 138 messages, still downloadable from the Buf Schema Registry, plus the published SDKs and container images.'
url: https://raw.githubusercontent.com/api-evangelist/topl/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  probe_state: covered
  source:
  - authentication
  - rate-limits
  generated: '2026-11-02'
  method: derived
image: https://raw.githubusercontent.com/Topl/Knowledge-Base/main/static/img/apparatus-logo.svg
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment
x-also-known-as: Apparatus
x-secondary-market-listing: https://www.nasdaqprivatemarket.com/
x-secondary-market-listing-note: 'The harvest source. Deliberately NOT wired as a Website pointer — a trading-venue listing
  page is not a company web presence (roadmap#56). Topl has no live web presence: apparatus.live does not answer and topl.co
  is no longer theirs.'
specificationVersion: '0.20'
x-status: defunct
x-status-detail: Wound down; no first-party site resolves. Tracked as a secondary-market entity only. No Website registered
  on purpose.
created: '2026-08-30'
modified: '2026-09-16'
tags:
- Company
- Blockchain
- Distributed Ledger
- gRPC
- Protobuf
- Web3
- Proof of Stake
- Sustainability
- Impact
- Tokenization
- Wound Down
- Defunct
apis:
- aid: topl:apparatus-node
  name: Apparatus (Topl) Node and Genus gRPC API
  description: 'The gRPC interface to the Apparatus (Topl) blockchain: NodeRpc on the Bifrost full node for submitting transactions,
    reading blocks and following the chain tip, and the Genus indexer''s BlockService, TransactionService, NetworkMetricsService
    and TokenService for querying blocks, transactions, transaction outputs, network statistics and token policies. The node
    also implements the standard gRPC Health Checking Protocol. The contract is published and still downloadable; the service
    is not running.'
  humanURL: https://github.com/Topl/Knowledge-Base
  baseURL: https://testnet.topl.tech
  x-baseurl-status: NXDOMAIN when probed 2026-08-30. This is the base the archived quickstart documents ("The host is testnet.topl.tech
    and the port is 443", with --secure for TLS); it is recorded because it is what the provider published, not because it
    answers. A node can still be run locally from docker.io/toplprotocol/bifrost-node on ports 9084/9085.
  tags:
  - Blockchain
  - gRPC
  - Protobuf
  - Transaction
  - Blocks
  - Tokens
  tags_raw:
  - Blockchain
  - gRPC
  - Protobuf
  - Transactions
  - Blocks
  - Tokens
  properties:
  - type: Protobuf
    url: grpc/node/services/bifrost_rpc.proto
  - type: Protobuf
    url: grpc/genus/genus_rpc.proto
  - type: Protobuf
    url: grpc/topl-protobuf.yml
  - type: Authentication
    url: authentication/topl-authentication.yml
  - type: Conventions
    url: conventions/topl-conventions.yml
  - type: DataModel
    url: data-model/topl-data-model.yml
  - type: Conformance
    url: conformance/topl-conformance.yml
  - type: RateLimits
    url: rate-limits/topl-rate-limits.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://topl.tech
- type: GitHubOrganization
  url: https://github.com/Topl
- type: Documentation
  url: https://github.com/Topl/Knowledge-Base
- type: Protobuf
  url: grpc/topl-protobuf.yml
- type: Packages
  url: packages/topl-packages.yml
- type: SDKs
  url: packages/topl-packages.yml
- type: CLI
  url: cli/topl-cli.yml
- type: Authentication
  url: authentication/topl-authentication.yml
- type: Conventions
  url: conventions/topl-conventions.yml
- type: DataModel
  url: data-model/topl-data-model.yml
- type: Conformance
  url: conformance/topl-conformance.yml
- type: Lifecycle
  url: lifecycle/topl-lifecycle.yml
- type: ChangeLog
  url: changelog/topl-changelog.yml
- type: Plans
  url: plans/topl-plans-pricing.yml
- type: RateLimits
  url: rate-limits/topl-rate-limits.yml
- type: LLMsTxt
  url: llms/topl-llms.txt
x-pointer-liveness:
  checked: '2026-08-30'
  note: 'Every external pointer above was fetched with a browser User-Agent on 2026-08-30 and returned 200. The Website pointer
    that this repo previously carried (https://www.nasdaqprivatemarket.com/) was REMOVED: it is the secondary-market venue
    this company was harvested from, not Topl''s own site, and crediting it as a web presence is false credit (roadmap#56).'
  probes:
  - url: https://github.com/Topl
    status: 200
  - url: https://github.com/Topl/Knowledge-Base
    status: 200
  - url: https://buf.build/seanattopl/topl-protobuf-specs
    status: 200
  - url: https://central.sonatype.com/namespace/co.topl
    status: 200
  - url: https://hub.docker.com/u/toplprotocol
    status: 200
x-not-published:
  note: Deliberately absent. Each of these was probed and missed; nothing is stubbed to fill a slot.
  well_known: Every /.well-known path returned 404 on topl.co (not their domain) and no response on apparatus.live. Probe
    recorded in well-known/topl-well-known.yml; NO WellKnown pointer emitted.
  agent_card: No /.well-known/agent-card.json or /.well-known/agent.json on any host. a2a/ is empty by design.
  mcp_server: 'No MCP server exists. mcp/topl-mcp.yml records a derived candidate with deployment.mode: none and is NOT wired
    as an MCPServer pointer.'
  openapi: No OpenAPI or Swagger document was found on any host. The contract this provider published is protobuf, and it
    is saved in grpc/.
  asyncapi: No event or streaming contract beyond the gRPC server-streaming RPCs already in grpc/.
  graphql: No GraphQL surface.
  wsdl: No SOAP surface.
  skills: No OpenAPI to ground agent skills in, and no provider-published skills or AGENTS.md.
  errors: gRPC status codes only; no error reference survives on any reachable host, so no error catalog is asserted.
  scopes: No OAuth scheme, so no scopes to derive.
  security_programs: 'No security.txt, bug bounty page or trust center reachable. Domain security was NOT probed: topl.co
    has been owned by a third party since 2024-12-30, and measuring its TLS/DNS posture would attribute a stranger to Topl.'
  status_page: None found.
  sandbox: The testnet and its faucet are gone; toplprotocol/faucet remains on Docker Hub but there is no network for it to
    fund.
x-enrichment:
  date: '2026-08-30'
  status: enriched
  artifacts_added: 52
  pass: local-v1
x-coverage:
  state: covered
  reason: contract-recovered
  detail: The company is wound down — apparatus.live does not answer, docs.topl.co / docs.apparatus.live / topl.services /
    testnet.topl.tech all return NXDOMAIN, all ten remaining GitHub repos are archived, and topl.co was re-registered by an
    unrelated owner on 2024-12-30 — but the full 38-file protobuf contract is still published on the Buf Schema Registry and
    was recovered verbatim, so this profile is built on a real first-party contract rather than on an absence.
  evidence:
  - url: https://buf.build/seanattopl/topl-protobuf-specs
    status: 200
  - url: https://github.com/Topl/Knowledge-Base
    status: 200
  - url: https://docs.topl.co/
    status: 0
  - url: https://apparatus.live/
    status: 0
  - url: https://topl.co/
    status: 200
  checked: '2026-08-30'
x-lifecycle:
  state: shuttered
  reason: domain-does-not-resolve
  observed: '2026-09-27'
  detail: The company's own domain returned no A or AAAA record when probed. This is an observation about the domain, not
    a request from the company.
  indexed: false

Topl API — frequently asked questions

Does Topl have an API?

Yes. APIs.io lists 1 API from Topl, including Apparatus (Topl) Node and Genus gRPC API.

How do I authenticate with the Topl API?

Topl uses bearer-token authentication (0 schemes). The details are profiled on APIs.io as Topl Authentication.

Is the Topl API ready for AI agents?

Topl has a Kin Score of 0.0 out of 100 (minimal) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-02.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/topl"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/topl/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/topl/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.