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Quickstart

Your first call.

Plain HTTPS GET, JSON back. No key, no SDK.

1Read the market

2Follow a token

Take an address from step 1. Add ?chain= for 0x contracts.

Keys & limits

…
HeaderResult
nonePublic reads work. Limits are per endpoint, on the reference. Over the limit: 429 with Retry-After.
X-Api-Key: cfb_…Your own quota of — calls a minute, counted on your dashboard.
Error codes
401 invalid_api_keyUnknown or revoked key.
403 builders_disabledKeys are not accepted right now.
429 rate_limitedOver the key's quota. Wait Retry-After seconds.

Browsers can call the public reads directly (CORS open, no cookies).