Topl

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
  label: Open access
  confidence: low
  source:
  - authentication
  - rate-limits
  generated: '2026-09-02'
  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: '2026-08-30'
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'