Skip to content
verify mcp Beta VerifyMCP is currently in beta. If you notice any issues, get in touch and we’ll put it right.

Voyager Starknet Explorer

NPM · VOYAGER-MCP · SCANNED SEP 21

Live Starknet explorer data: transactions, contracts, tokens, NFTs, staking

Available components

+7 this week 70 Trust /100
Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →

Supply Chain Security98
  • No malware found by supply-chain analysis.Pass
  • No known CVEs affecting this package version or its production dependencies.Pass
  • No install/post-install scripts declared.Pass
  • 31 of 96 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency19
Schema Quality & AI Usability76
  • AI-judged instruction clarity (good).Pass
  • Context-footprint check failed: tool/resource definitions use about 8500 tokens (~103/item across 82 items; 82 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management47
  • Stability observed for 14 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 100% of tool parameters carry a description.Pass
Tool Safety75
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "get_contract_transfer_tokens" implies "transfer" and declares no destructiveHint at all, which the MCP spec reads as destructive by default. See how to fix → Fail
  • An AI judge read all 83 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Install

How do I install the Voyager Starknet Explorer MCP server?

Voyager Starknet Explorer runs locally as an npm package, launched with npx -y voyager-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

npm · voyager-mcp

# add to Claude Code
claude mcp add online-voyager-mcp -- npx -y voyager-mcp
// .cursor/mcp.json
{
  "mcpServers": {
    "online-voyager-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "voyager-mcp"
      ]
    }
  }
}
// .vscode/mcp.json
{
  "servers": {
    "online-voyager-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "voyager-mcp"
      ]
    }
  }
}
# add to Codex CLI
codex mcp add online-voyager-mcp -- npx -y voyager-mcp
// opencode.json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "online-voyager-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "voyager-mcp"
      ],
      "enabled": true
    }
  }
}
# add to OpenClaw
openclaw mcp add online-voyager-mcp --command npx --arg -y --arg voyager-mcp
# ~/.hermes/config.yaml
mcp_servers:
  online-voyager-mcp:
    command: "npx"
    args: ["-y", "voyager-mcp"]
// ~/.netclaw/config/netclaw.json
{
  "McpServers": {
    "online-voyager-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "voyager-mcp"
      ]
    }
  }
}
# add to Vellum
assistant mcp add online-voyager-mcp -t stdio -c npx -a -y voyager-mcp
// mcp.json
{
  "mcpServers": {
    "online-voyager-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "voyager-mcp"
      ]
    }
  }
}
Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 21 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

  • 18 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

  • 16 Sept 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

  • 15 Sept 26 +4
    • Stability: unverified → 0.27 functional
  • 8 Sept 26 +15
    • Malware scan: unverified → pass security
  • 7 Sept 26 48

    First indexed and scored.

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 21 Sept 2026 · Analysed npm/voyager-mcp@0.2.1

Provenance No attestation

The registry publishes no build provenance for this version, so there is nothing to verify.

Result No attestation
Ecosystem npm

Background: How many MCP packages publish verified provenance →

Dependencies 96 packages
Packages resolved 96
Stale 31
Tree resolution Complete

Background: SBOMs and build attestations, explained →

MCP tools · 82 exposed · ~8,216 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
get_account_call ~51

Get details of a specific account call by its id.

NameTypeReqDescription
idstringyesAccount-call id.
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_api_status ~45

Check the Voyager API status / health. Useful as a connectivity sanity check.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_block ~66

Get a Starknet block by number, hash, or "pre_confirmed".

NameTypeReqDescription
blockstringyesBlock number, block hash (0x...), or "pre_confirmed".
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_cairo_v1_contracts_count ~47

Get the count of Cairo 1 contracts on Starknet.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_class ~66

Get a Starknet class by hash: type, declaration info, verification status, and ABI.

NameTypeReqDescription
classHashstringyesStarknet class hash (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_class_code ~74

Get the verified Cairo source code for a class. Use this to read the actual contract implementation when writing or auditing Starknet code.

NameTypeReqDescription
classHashstringyesStarknet class hash (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_class_contracts ~161

List the contracts deployed from a given class, newest first. Cursor pagination: pass `cursor` from a previous response's nextCursor/prevCursor; a null nextCursor means the end. Per-row activity counts are capped and render as "1000+" beyond the cap.

NameTypeReqDescription
classHashstringyesStarknet class hash (0x-prefixed hex).
cursorstringPagination cursor — pass the value from the previous response to fetch the next page.
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.

No output schema declared.

No examples provided.

get_class_decompiled ~67

Get the decompiled code of a class (useful when verified source is not available).

NameTypeReqDescription
classHashstringyesStarknet class hash (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_class_functions ~62

Get the callable functions (ABI entrypoints) declared by a class.

NameTypeReqDescription
classHashstringyesStarknet class hash (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_contract ~68

Get a Starknet contract by address: class hash, type, deployment info, ABI, and aliases.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_contract_bridge_transactions ~114

List L1↔L2 bridge transactions involving a contract.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.

No output schema declared.

No examples provided.

get_contract_class_history ~113

List the class history (implementation upgrades) of a contract.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.

No output schema declared.

No examples provided.

get_contract_code ~67

Get the code of a contract: verified Cairo source if available, otherwise bytecode/decompiled.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_contract_erc20_balance_history ~94

Get the ERC-20 balance history of a contract over a time range.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
timerangestringTime range.
tokenAddressstringFilter by token address (0x-prefixed).

No output schema declared.

No examples provided.

get_contract_erc20_tokens_held ~65

List the ERC-20 tokens a contract has ever held.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_contract_functions ~61

Get the callable functions (ABI entrypoints) of a contract.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_contract_holders ~126

List token holders for a token contract (paginated).

NameTypeReqDescription
contractAddressstringyesToken contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
typestringToken standard. Defaults to "erc20".

No output schema declared.

No examples provided.

get_contract_portfolio ~64

Get the current token portfolio (holdings) of a contract / account.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_contract_token_balances ~61

Get the token balances held by a specific contract address.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_contract_transfer_tokens ~72

List the distinct tokens involved in a contract's transfers (filter helper).

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
typestringToken standard.

No output schema declared.

No examples provided.

get_contract_transfers ~243

List token transfers involving a contract, with filters (token, counterparties, time range). Keyset pagination via `cursor`.

NameTypeReqDescription
contractAddressstringyesStarknet contract address (0x-prefixed hex).
cursorstringKeyset pagination cursor: the `id` of the last item from the previous response.
fromstringFilter by sender address (0x-prefixed).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
orderBystringSort order. Defaults to "desc".
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
timestampFromintegerStart of time range (Unix seconds).
timestampTointegerEnd of time range (Unix seconds).
tostringFilter by recipient address (0x-prefixed).
tokenAddressstringFilter by token contract address (0x-prefixed).
typestringToken standard. Defaults to "erc20".

No output schema declared.

No examples provided.

get_daily_stats ~91

Get historical daily network statistics (time series) for Starknet.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
timerangestringTime range of the series.

No output schema declared.

No examples provided.

get_delegators_over_time ~57

Get the delegator count over time (time series).

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
timerangestringTime range of the series.

No output schema declared.

No examples provided.

get_event ~48

Get details of a single event by its id.

NameTypeReqDescription
idstringyesEvent id.
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_indexer_lagging ~47

Check whether the Voyager indexer is lagging behind the chain tip.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_l1_bridge_transactions ~117

Get the bridge transactions associated with an L1 transaction (paginated).

NameTypeReqDescription
hashstringyesL1 (Ethereum) transaction hash (0x-prefixed).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.

No output schema declared.

No examples provided.

get_l1_state_updates ~119

Get the Starknet state updates included in an L1 transaction (paginated).

NameTypeReqDescription
hashstringyesL1 (Ethereum) transaction hash (0x-prefixed).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.

No output schema declared.

No examples provided.

get_l1_transaction ~64

Get an Ethereum L1 transaction related to Starknet by its hash.

NameTypeReqDescription
hashstringyesL1 (Ethereum) transaction hash (0x-prefixed).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_marketplace_stats ~132

Get NFT marketplace stats ranked by an attribute over a timeframe.

NameTypeReqDescription
attributestringAttribute to rank by.
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
sortstringSort order. Defaults to "desc".
timeframestringTime window for the stats.

No output schema declared.

No examples provided.

get_message ~67

Get a Starknet L1↔L2 message by its message hash.

NameTypeReqDescription
msgHashstringyesL1 ↔ L2 message hash (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_message_bridge_transactions ~123

Get the bridge transactions associated with an L1↔L2 message (paginated).

NameTypeReqDescription
msgHashstringyesL1 ↔ L2 message hash (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.

No output schema declared.

No examples provided.

get_network_status ~44

Get the Starknet network status (chain health / indexer state).

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_nft ~76

Get details of a single NFT (token) by contract address and token id.

NameTypeReqDescription
contractAddressstringyesNFT contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
tokenIdstringyesToken id within the collection.

No output schema declared.

No examples provided.

get_nft_contract ~60

Get details of an NFT contract (collection) by address.

NameTypeReqDescription
contractAddressstringyesNFT contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_nft_contract_balance ~112

List an owner's NFT balances across collections (optionally a specific collection).

NameTypeReqDescription
contractAddressstringFilter by NFT contract address.
cursorstringPagination cursor — pass the value from the previous response to fetch the next page.
limitintegerMax items to return (1–100).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
ownerAddressstringyesOwner address (0x-prefixed hex).

No output schema declared.

No examples provided.

get_nft_stats ~132

Get NFT collection stats ranked by an attribute over a timeframe.

NameTypeReqDescription
attributestringAttribute to rank by.
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
sortstringSort order. Defaults to "desc".
timeframestringTime window for the stats.

No output schema declared.

No examples provided.

get_stake_over_time ~54

Get total stake over time (time series).

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
timerangestringTime range of the series.

No output schema declared.

No examples provided.

get_staking_overview ~42

Get a high-level overview of Starknet staking.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_stats ~46

Get current Starknet network statistics: transaction counts, performance metrics, and financial data.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_today_stats ~57

Get today's Starknet network statistics over a recent window.

NameTypeReqDescription
hoursstringLookback window. Defaults to 24h.
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_token_functions ~60

Get the callable functions (ABI entrypoints) of a token contract.

NameTypeReqDescription
addressstringyesToken contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_token_holders ~131

Get the holders of a token (paginated): addresses, balances, and aliases.

NameTypeReqDescription
addressstringyesToken contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
typestringToken standard. Defaults to "erc20".

No output schema declared.

No examples provided.

get_token_security ~67

Get a token's security scan (e.g. Blockaid) — risk flags for the token contract.

NameTypeReqDescription
addressstringyesToken contract address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).

No output schema declared.

No examples provided.

get_token_transfers ~239

List transfers of a specific token (by its contract address) within a time window. Defaults to the last 7 days; adjust via timestampFrom/timestampTo (max ~90 days). For very high-volume tokens, narrow the window to avoid upstream timeouts. Keyset pagination via `cursor`.

NameTypeReqDescription
cursorstringKeyset pagination cursor: pass the `id` of the last item from the previous response.
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
orderBystringSort order. Defaults to "desc".
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
timestampFromintegerStart of time range (Unix seconds). Defaults to 7 days ago.
timestampTointegerEnd of time range (Unix seconds). Defaults to now.
tokenAddressstringyesToken contract address (0x-prefixed hex).
typestringToken standard. Defaults to "erc20".

No output schema declared.

No examples provided.

get_top_contracts_stats ~135

Get the most-used contracts ranked by activity over a timeframe.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
orderstringSort order.
orderBystringMetric to rank by.
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
qstringSearch query.
timeframestringTime window.

No output schema declared.

No examples provided.

get_transaction ~74

Get a Starknet transaction by hash: status, type, fee, block, and associated data. Use for debugging or inspecting a specific tx.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
txnHashstringyesTransaction hash (0x-prefixed felt).

No output schema declared.

No examples provided.

get_transaction_messages ~60

Get the L1↔L2 messages associated with a transaction.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
txnHashstringyesTransaction hash (0x-prefixed felt).

No output schema declared.

No examples provided.

get_transaction_storage_diffs ~62

Get the storage diffs (state changes) produced by a transaction.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
txnHashstringyesTransaction hash (0x-prefixed felt).

No output schema declared.

No examples provided.

get_transaction_trace ~69

Get the execution trace (nested call tree) of a transaction. Use to debug exactly what calls a tx made.

NameTypeReqDescription
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
txnHashstringyesTransaction hash (0x-prefixed felt).

No output schema declared.

No examples provided.

get_validator_activity ~115

Get the staking activity log for a validator.

NameTypeReqDescription
addressstringyesValidator address (0x-prefixed hex).
networkstringNetwork to query. Defaults to the server's configured network (mainnet).
pageintegerPage number (1-based). Defaults to 1.
pageSizenumberItems per page: 10, 25, 50, or 100. Defaults to 25. Keep small to save context.
sortstringSort order.

No output schema declared.

No examples provided.

Common questions

What is the Voyager Starknet Explorer MCP server?

Voyager Starknet Explorer is an MCP server listed in the public MCP registry as online.voyager/mcp. Live Starknet explorer data: transactions, contracts, tokens, NFTs, staking. This page covers its npm package (voyager-mcp).

Is the Voyager Starknet Explorer MCP server safe to use?

Voyager Starknet Explorer scores 70 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 21 September 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the Voyager Starknet Explorer MCP server expose?

Voyager Starknet Explorer exposes 82 tools: voyager_ping, list_transactions, get_transaction, get_transaction_trace, get_transaction_messages, and 77 more. Their descriptions and schemas cost roughly 8,216 tokens of context every time the server is loaded.

Is the Voyager Starknet Explorer MCP server still maintained?

Voyager Starknet Explorer is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

What licence is the Voyager Starknet Explorer MCP server under?

Voyager Starknet Explorer declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.