generated: '2026-08-23'
method: searched
source:
- https://docs.immutable.com/docs/guides/advanced-setup/api-keys
- https://docs.immutable.com/docs/products/immutable-chain/faucet
- https://docs.immutable.com/docs/products/asset-contracts/minting-api
model: separate environment, not a test mode on one host
note: >-
  Immutable's sandbox is a genuinely separate environment — a different API host,
  a different chain, a different RPC and a different set of API keys — rather
  than a test-mode flag. Test value in this domain is TEST CURRENCY, not test
  card numbers: the faucet dispenses tIMX and every transaction settles on a real
  public testnet. Nothing here is a fabricated credential; the only published
  fixture-like values are the key prefixes and the faucet quota.
environments:
- name: Sandbox
  api_base: https://api.sandbox.immutable.com
  chain_name: imtbl-zkevm-testnet
  chain_id: 13473
  rpc: https://rpc.testnet.immutable.com
  explorer: https://explorer.testnet.immutable.com
  currency: tIMX
  publishable_key_prefix: pk_imapik-sandbox-
- name: Production
  api_base: https://api.immutable.com
  chain_name: imtbl-zkevm-mainnet
  chain_id: 13371
  rpc: https://rpc.immutable.com
  explorer: https://explorer.immutable.com
  currency: IMX
  publishable_key_prefix: pk_imapik-
key_modes:
  test_vs_live: >-
    Keys are environment-scoped and issued per project in Hub. A sandbox
    publishable key carries the `pk_imapik-sandbox-` prefix; production carries
    `pk_imapik-`. Secret keys have no published prefix. Sending the wrong key
    class returns 401 (the Audience API documents exactly this: a publishable key
    sent to DELETE /v1/audience/data is rejected).
  issued_at: https://hub.immutable.com
  rotation: Hub -> Settings -> API Keys -> Rotate Key; the old key invalidates immediately.
test_funds:
  faucet:
    url: https://hub.immutable.com/faucet
    docs: https://docs.immutable.com/docs/products/immutable-chain/faucet
    dispenses: 10 test-IMX (tIMX)
    cooldown: 24 hours
    auth_required: true
    auth_note: Requires a Hub account; the faucet is not anonymous.
test_cards: null
test_cards_note: >-
  Not applicable. Immutable is not a card acquirer. Fiat onramp is handled by a
  third party (Transak) inside the Checkout widget, so any test card values
  belong to Transak's documentation, not Immutable's, and none are reproduced
  here.
time_simulation:
  supported: false
  note: No test clocks or time-travel fixtures. Block time on testnet is real.
triggers_and_fixtures:
  supported: false
  note: >-
    No published fixture/trigger tooling for forcing webhook events or error
    states. To exercise a mint webhook you must actually mint on testnet.
gaps:
- No anonymous/keyless sandbox — every sandbox flow requires a Hub project first.
- No hosted API console or "try it" runner was found on the API reference pages.
- No seeded test data set (no pre-populated demo collection or wallet).
x-evidence:
- url: https://docs.immutable.com/docs/products/immutable-chain/faucet
  http_status: 200
- url: https://docs.immutable.com/docs/guides/advanced-setup/api-keys
  http_status: 200