क्रय्यस्तदर्थे

Operational rule vidhi

The words क्रय्य is considered to be derived, in the meaning of 'the one that can be purchased'.

Word by word (padaccheda)

Substitute / term क्रय्यः prathamā · ekavacanaRight context तदर्थे saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

क्रय्यः तदर्थे

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

In the क्रय्य there is substitution of अय् for ए when the sense is that of 'exposed or put out for sale, saleable'.
The word क्रय्य is derive from क्री 'to buy', with the affix यत्; the guna ए being changed to य ॥ The word तदर्थ means 'for the purpose of that' i.e., for the purpose of being bought. As क्रय्या गौः, क्रय्यः कम्बलः ॥ Why do we say 'when the sense is that of saleable'? Observe क्रेयं नो धान्यं न चास्ति क्रय्यम् "we want to purchase corn, but it is not put out for sale".

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.