Is there an API for the Google Play Store?

You can create a Custom Search Engine that only looks at the Play Store, and use the Custom Search Engine API to search the play store.

1. Create a "Custom Search" at https://cse.google.com/ 
2. Set sites to Search: https://play.google.com/store/apps/details?id=*  

Name: Play Store

Advanced > Restrict Types: MobileApplication

Now when you search using the Custom Search Engine API it will return MobileApplication results from the Play Store, including ratings, title, etc..

Here's an example result:

1. { 
2. "kind": "customsearch#result", 
3. "title": "Cisco WebEx Meetings - Android Apps on Google Play", 
4. "htmlTitle": "Cisco WebEx Meetings - Android Apps on Google Play", 
5. "link": "https://play.google.com/store/apps/details?id=com.cisco.webex.meetings",  
6. "displayLink": "play.google.com",  
7. "snippet": "Tap into a WebEx meeting, wherever you are, with WebEx Meetings for Android!", 
8. "htmlSnippet": "Tap into a WebEx meeting, wherever you are, with WebEx Meetings for Android!", 
9. "cacheId": "WqylqVk2VQsJ", 
10. "formattedUrl": "https://play.google.com/store/apps/details?id...cisco.webex.meetings",  
11. "htmlFormattedUrl": "https://play.google.com/store/apps/details?id...cisco.webex.meetings",  
12. "pagemap": { 
13. "cse_image": [ 
14. { 
15. "src": " 

1. "  
2. } 
3. ], 
4. "organization": [ 
5. { 
6. "url": "/store/apps/developer?id=Cisco+Systems,+Inc.", 
7. "name": "Cisco Systems, Inc.", 
8. "genre": "Business" 
9. }, 
10. { 
11. "name": "Android" 
12. } 
13. ], 
14. "cse_thumbnail": [ 
15. { 
16. "width": "259", 
17. "height": "194", 
18. "src": "https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcT7WE9QsjOi70rEDnvwTupHTB7o3BWOKrDfdlKFbaO2PxrNlEPg8MvOLEE9"  
19. } 
20. ], 
21. "aggregaterating": [ 
22. { 
23. "ratingvalue": "4.254438400268555", 
24. "ratingcount": "23997" 
25. } 
26. ], 
27. "offer": [ 
28. { 
29. "url": "https://play.google.com/store/apps/details?id=com.cisco.webex.meetings&rdid=com.cisco.webex.meetings&rdot=1&feature=md",  
30. "price": "0" 
31. } 
32. ], 
33. "metatags": [ 
34. { 
35. "og:type": "website", 
36. "og:title": "Cisco WebEx Meetings - Android Apps on Google Play", 
37. "og:url": "https://play.google.com/store/apps/details?id=com.cisco.webex.meetings"  
38. } 
39. ], 
40. "mobileapplication": [ 
41. { 
42. "url": "https://play.google.com/store/apps/details?id=com.cisco.webex.meetings",  
43. "image": "https://lh3.ggpht.com/MmfNO-OC2YuTrxTYhhPypVgxPIPLe1uDAW5HlcUWbvawzIAevWqqa2_dMOgjWAJTuy8=w300",  
44. "topdeveloperbadgeurl": "https://ssl.gstatic.com/android/market_images/badges/topdev_ann.png",  
45. "name": "Cisco WebEx Meetings", 
46. "screenshot": "https://lh5.ggpht.com/cum5G5MiGscOygPH1pM3RYfFavpQJzJh4Djyz-1E78yOScoNN1Xudn_b1J1sacueYEY=h310",  
47. "description": "Porta le tue riunioni web ovunque! Partecipa a qualsiasi conferenza web direttamente dal tuo tablet o smartphone Android. Cisco WebEx Meetings for Android works with Cisco WebEx Meeting Center, Cisco WebEx Training...", 
48. "datepublished": "December 22, 2015", 
49. "filesize": "19M", 
50. "numdownloads": "10,000,000 - 50,000,000", 
51. "softwareversion": "8.6.1", 
52. "operatingsystems": "4.0.3 and up", 
53. "contentrating": "Everyone" 
54. } 
55. ] 
56. } 
57. },