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A public sandbox is available for testing API connectivity and web trading.
Sandbox is subsetThe sandbox hosts a subset of the production order books and supports all exchange functionality except Transfers. You can add unlimited fake funds for testing.
Login sessions and API keys are separate from production. Log into the sandbox web interface to create an API key, deposit/withdraw funds, etc.

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Sandbox URLs

Use the following URLs to test your API connectivity. See the Runbook for Production URLs.
APIURL
REST APIhttps://api-public.sandbox.exchange.coinbase.com
Websocket Feedwss://ws-feed-public.sandbox.exchange.coinbase.com
Websocket Direct Feedwss://ws-direct.sandbox.exchange.coinbase.com
FIX 5.0 API - Order Entrytcp+ssl://fix-ord.sandbox.exchange.coinbase.com:6121
FIX 5.0 API - Market Data Snapshot Enabledtcp+ssl://fix-md.sandbox.exchange.coinbase.com:6121
FIX 5.0 API - Market Data Snapshot Disabledtcp+ssl://fix-md.sandbox.exchange.coinbase.com:6122
FIX 5.0 API - Dedicated Drop Copytcp+ssl://fix-dc.sandbox.exchange.coinbase.com:6122

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MiCA Sandbox URLs

MiCA clients must use the following URLs to test your API connectivity. See the Runbook for Production URLs.
APIURL
REST APIhttps://api-us.dma.sandbox.prime.coinbase.com
Websocket Feedwss://ws-us.dma.sandbox.prime.coinbase.com
Websocket Direct Feedwss://ws-us-direct.dma.sandbox.prime.coinbase.com
FIX 5.0 API - Order Entrytcp+ssl://fix-us.dma.sandbox.prime.coinbase.com:7110
FIX 5.0 API - Market Data Snapshot Enabledtcp+ssl://fix-us.dma.sandbox.prime.coinbase.com:7120
FIX 5.0 API - Market Data Snapshot Disabledtcp+ssl://fix-us.dma.sandbox.prime.coinbase.com:7121
FIX 5.0 API - Dedicated Drop Copytcp+ssl://fix-dc.dma.sandbox.prime.coinbase.com:7122

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Sandbox SSL Certificate

Your FIX SSL client must validate the following sandbox FIX server SSL certificate: 
-----BEGIN CERTIFICATE-----
MIIEdDCCA1ygAwIBAgIQD03L1cHVypYSDFuvcnpAHzANBgkqhkiG9w0BAQsFADBG
MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRUwEwYDVQQLEwxTZXJ2ZXIg
Q0EgMUIxDzANBgNVBAMTBkFtYXpvbjAeFw0yMjAzMjcwMDAwMDBaFw0yMzA0MjUy
MzU5NTlaMCoxKDAmBgNVBAMMHyouc2FuZGJveC5leGNoYW5nZS5jb2luYmFzZS5j
b20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC8LYRdqMoVNa/0M4MF
+Wkr8SiybZ95JycTE+0ZVmf92DKo4I8m/8fBtOrH0jgrhvamVSJ0lI6VFiAzlTd1
doUbliQ9Xm1aE/YHQO9J64AIP97peysgHBd+g3/Vhz33aaaU2vyHH5kPHiekU8n/
ObXPPoFd/Awul8uxxlXsVFx8oBWL2MeMjLNLLWNiGWq+lQloGKsQYVR/fQZizvpP
vyZO6pCLRId6+Wq3Tcb7NHQZc6+tePVi+5fovE+lm/yQrhjGqDzI7P4rWjJqCPrA
sYJeYFcVJhdSuFY2Ngm8eKeDP14TVEs9pkIWvyMGmB17QBPbRJipdoKu1N6fsx54
N9JDAgMBAAGjggF4MIIBdDAfBgNVHSMEGDAWgBRZpGYGUqB7lZI8o5QHJ5Z0W/k9
0DAdBgNVHQ4EFgQUa5RZ0yvv71YteSuqO1VRvmGGKv0wKgYDVR0RBCMwIYIfKi5z
YW5kYm94LmV4Y2hhbmdlLmNvaW5iYXNlLmNvbTAOBgNVHQ8BAf8EBAMCBaAwHQYD
VR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMD0GA1UdHwQ2MDQwMqAwoC6GLGh0
dHA6Ly9jcmwuc2NhMWIuYW1hem9udHJ1c3QuY29tL3NjYTFiLTEuY3JsMBMGA1Ud
IAQMMAowCAYGZ4EMAQIBMHUGCCsGAQUFBwEBBGkwZzAtBggrBgEFBQcwAYYhaHR0
cDovL29jc3Auc2NhMWIuYW1hem9udHJ1c3QuY29tMDYGCCsGAQUFBzAChipodHRw
Oi8vY3J0LnNjYTFiLmFtYXpvbnRydXN0LmNvbS9zY2ExYi5jcnQwDAYDVR0TAQH/
BAIwADANBgkqhkiG9w0BAQsFAAOCAQEATpjyCMwAOSFKFTA67UaVkDCjz/ULBY6P
L4JwTJ+7kmT+HMvGimx15CsVjne64bT5twWlzqA/l4h25HGj0hD0TU2ktqmFhfAm
DpjGVp4KgIcZpvv7oRIU4e5I422Y++2UVuATwLWdELgpnm4AVq1aqI10XrQlJeHL
gRVfV5qkr9Vsc+fk7HY7YwbNQk2jXbRaj22f6GxiJ/6VmUcCD7zZ1GZtUipv0JEy
PtWD/BbSKNx1GJnLZ6L+QytPs+MW+FEetlU/oqPuyYRhmJUBUiwKkm6yKWRj9tQf
sq0a4uLI3SUgsBv/CQ/Qa9LnRdNjvlWSKLzeIX2LU9rE/3F3oQh7HQ==
-----END CERTIFICATE-----

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Unsupported Features

The Transfer endpoints are not available for testing in the Sandbox:

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Creating API Keys

To create an API key in the sandbox web interface:
  1. Go to the sandbox web interface
  2. Create an account or sign in.
  3. Go to API in your profile dropdown menu.
  4. Click New API Key.

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Managing Funds

To add or remove funds in the sandbox web interface:
  1. Go to the Portfolios tab.
  2. Click the Deposit and Withdraw buttons as you would on the production web interface.