What 'guaranteed rankings' actually means
Most ranking guarantees use exact-match phrases of low or zero search volume. 'Guaranteed top 10 for [your-business-name + city]' means nothing — you'll rank #1 for your own brand name organically anyway.
Some guarantees lock you into a long contract where the 'guarantee' just means a refund of one month's fee. That's not protection, it's marketing.
What real performance commitments look like
Traffic guarantees: agency commits to a specific lift in qualified organic sessions over a 6 or 12 month period, with a milestone review and partial refund/extension if missed.
Lead or revenue guarantees: agency commits to a specific number of conversions or attributed revenue, usually after a 90-day setup period.
Performance-based pricing: a portion of fee tied to outcomes. Less common but available from confident senior agencies on the right kind of engagement.