GET /info/liquidity-sources/101 lists the sources the router can price against.

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Steering routing

Pass sourceWhitelist on the quote to force a source:
An empty or omitted sourceWhitelist lets Astrolabe choose the best enabled source for the pair. disableRFQs: true excludes RFQ sources (astrolabe-partner-rfq) even when they’re enabled.

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PropAMM tiers

The astrolabe-propamm source is size-aware. Its on-chain QuoteState holds a small set of tiers, each a (max_amount_in, ask_price, bid_price) bucket in strictly ascending size. A quote selects the tightest tier whose max_amount_in covers your input; the response echoes it as astrolabe.tier. Inputs above the top tier are rejected — the desk will not clamp your clip down to a size it did not quote.