Aja Ekapada was mentioned in Puranas and Rig Veda.
a) Purana
Aja Ekapada ("unborn one-footed") is a Vedic deity representing a rare, one-legged form of Lord Shiva , often depicted as a cosmic pillar or Axis Mundi. Emerging from Vedic hymns, he is identified as one of the 11 Rudras, symbolizing supreme stability, ultimate reality, and the stillness of the yogic state.
b) Rig Veda
In general, Aja Ekapada was mentioned along with Ahirbudhnya.
उत वः शंसमुशिजामिव श्मस्यहिर्बुध्न्योऽज एकपादुत । त्रित ऋभुक्षाः सविता चनो दधेऽपां नपादाशुहेमा धिया शमि ॥
uta vaḥ śaṃsam uśijām iva śmasy ahir budhnyo 'ja ekapād uta | trita ṛbhukṣāḥ savitā cano dadhe 'pāṃ napād āśuhemā dhiyā śami ||
English translation:
“We desire, gods, to repeat the praise of you, who are propitiated by praise; may Ahirbudhnya, Aja Ekapāda, Trita, Ṛbhukṣin, Savitā, bestow upon us food, and may the swift-moving grandson of the waters, (Agni, be gratified by) our praises and our worship.”
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While Ahirbudhnya was related to AGNI and governing the foundation level, Aja Ekapāda governs Heaven.
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Rig Veda 1.67.5 - AGNI
अजो न क्षां दाधार पृथिवीं तस्तम्भ द्यां मन्त्रेभिः सत्यैः ॥
ajo na kṣāṃ dādhāra pṛthivīṃ tastambha dyām mantrebhiḥ satyaiḥ ||
English translation:
Like Aja (Ekapad) he supports the broad earth; he props up heaven with mantras that come true.
पावीरवी तन्यतुरेकपादजो दिवो धर्ता सिन्धुरापः समुद्रियः । विश्वे देवासः शृणवन्वचांसि मे सरस्वती सह धीभिः पुरंध्या ॥
pāvīravī tanyatur ekapād ajo divo dhartā sindhur āpaḥ samudriyaḥ
| viśve devāsaḥ śṛṇavan vacāṃsi me sarasvatī saha dhībhiḥ puraṃdhyā ||
English translation:
The daughter of Pavīru, Thunder, and Aja Ekapad, the supporter of heaven, the river, and the waters of the sea— all the gods will hear my words: (they and also) Sarasvatī, along with insights and with plenty.
Aja Ekapada - the unborn with one leg.
According to my understanding, Aja Ekapada is none other than Surya, whose chariot was mentioned many a time as having ONE Wheel.
In Rig Veda, AGNI governs the base level, Indra governs the mid-space or Antariksha and Surya govens the HEAVEN.
यदयातं शुभस्पती वरेयं सूर्यामुप । क्वैकं चक्रं वामासीत्क्व देष्ट्राय तस्थथुः ॥
yad ayātaṃ śubhas patī vareyaṃ sūryām upa | kvaikaṃ cakraṃ vām
āsīt kva deṣṭrāya tasthathuḥ ||
English translation:
When you drove, you two lords of beauty, to Sūryā to woo her, where was your single wheel; where did you stand for the pointing out?
