Billing chains

Spoof settles onchain, and you can fund on whichever chain you prefer. Billing follows the chain that holds your balance, so in most cases you never think about it.

Supported chains

Fund any of these from the dashboard. If you hold a balance on more than one, you can pick a default in the app. The token contract address for each is included below.

Target a chain per request

To bill a specific call on a specific chain, send the x-spoof-billing-chain header:

curl https://api.spoofzone.com/v1/messages \
-H "x-api-key: $SPOOF_API_KEY" \
-H "x-spoof-billing-chain: arbitrum" \
-H "content-type: application/json" \
-d '{ "model": "claude-sonnet-4-6", "max_tokens": 256, "messages": [{ "role": "user", "content": "Hi" }] }'

The response echoes the chain it settled on in the x-spoof-billing-chain header.