[api] add gasFee info

[dustinxie]

No description provided.

[codecov]

Codecov Report

Merging #3063 (0dfda23) into master (8cce51c) will decrease coverage by 0.02%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #3063      +/-   ##
==========================================
- Coverage   64.76%   64.74%   -0.03%     
==========================================
  Files         215      215              
  Lines       22086    22096      +10     
==========================================
+ Hits        14303    14305       +2     
- Misses       6012     6018       +6     
- Partials     1771     1773       +2     

Impacted Files	Coverage Δ
api/coreservice.go	66.05% <57.14%> (-0.29%)	⬇️
pkg/routine/recurringtask.go	92.59% <0.00%> (-7.41%)	⬇️

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