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
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: '2026-08-30'
tags:
- Company
- Blockchain
- Distributed Ledger
- gRPC
- Protobuf
- Web3
- Proof of Stake
- Sustainability
- Impact
- Tokenization
- Wound Down
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: 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'