Build Onchain
by FBI
x402
6th to 15th December, 2025.
10-Day virtual program to learn and ideate consumer apps on x402.
Powered by Base India.
Apply Now
WHAT IS
x402?
x402 is an open protocol for internet-native payments, built around HTTP 402, enabling payments via API without registration, and is blockchain agnostic
Internet-Native Payments
Agentic Payments
The Future Stack
why
Participate?
Build with the latest x402 stack
Top projects showcased at Coinbase House
Get a chance to be featured on Base Café
Learn and Ideate with top mentors across the ecosystem
Top teams get rewarded upto 10K USD
WHAT are we lookingfrom builders ?
Ideate and shape internet native payment solutions using x402 — learn the tools, explore what’s possible, and turn your concepts into a strong final idea for submission.Whether you're exploring smarter payment systems, pay-per-use flows, or agentic payment ideas, this is your opportunity to advance the economy on Base.
Ideate Solutions
Build Infrastructure
Advance Economy
Enable Agents
Program
Schedule
Phase
Kickoff
Learning Phase
Idea Submission
Winners Announced
Dates
6th December
6th to 15th December
15th December
16th December
Be part of the India’s largest
Base Collective
Buildonchain is an initiative by FBI, a product obsessed collective of 2000+ of the sharpest builders in India, and is powered by Base India.
Join FBI Telegram
©️
2025 Build Onchain by FBI
Build Onchain
by FBI x402
6th to 15th December, 2025.
BASE INDIA
10-Day virtual program to learn and ideate consumer apps on x402.
Powered by Base India.
Apply Now
The Future Stack
WHAT IS x402?
x402 is an open protocol for internet-native payments, built around HTTP 402, enabling payments via API without registration, and is blockchain agnostic
Internet-Native Payments
Agentic Payments
why
Participate?
Build with the latest x402 stack
Top projects showcased at
Coinbase House
Get a chance to be featured on Base Café
Learn and Ideate with top mentors across the ecosystem
Top teams get rewarded upto 10K USD
WHAT are we lookingfrom builders ?
Ideate and shape internet native payment solutions using x402 — learn the tools, explore what’s possible, and turn your concepts into a strong final idea for submission.Whether you're exploring smarter payment systems, pay-per-use flows, or agentic payment ideas, this is your opportunity to advance the economy on Base.
Ideate Solutions
Build Infrastructure
Advance Economy
Enable Agents
Program Schedule
Phase
Kickoff
Learning Phase
Idea Submission
Winners Announced
Dates
6th December
6th to 15th December
15th December
16th December
Be part of the India’s largest Base Collective
Buildonchain is an initiative by FBI, a product obsessed collective of 2000+ of the sharpest builders in India, and is powered by Base India.
Join FBI Telegram
©️
2025 Build Onchain by FBI
Build Onchain by FBI
x402
6th to 15th December, 2025.
BASE INDIA
10-Day virtual program to learn and ideate consumer apps on x402.
Powered by Base India.
Apply Now
WHAT IS x402?
x402 is an open protocol for internet-native payments, built around HTTP 402, enabling payments via API without registration, and is blockchain agnostic
Internet-Native Payments
Agentic Payments
The Future Stack
why Participate?
Build with the latest x402 stack
Top projects showcased at Coinbase House
Get a chance to be featured on Base Café
Learn and Ideate with top mentors across the ecosystem
Top teams get rewarded upto 10K USD
WHAT are we lookingfrom builders ?
Ideate and shape internet native payment solutions using x402 — learn the tools, explore what’s possible, and turn your concepts into a strong final idea for submission.Whether you're exploring smarter payment systems, pay-per-use flows, or agentic payment ideas, this is your opportunity to advance the economy on Base.
Ideate Solutions
Build Infrastructure
Advance Economy
Enable Agents
Program Schedule
Phase
Kickoff
Learning Phase
Idea Submission
Winners Announced
Dates
6th December
6th to 15th December
15th December
16th December
Be part of the India’s largest Base Collective
Buildonchain is an initiative by FBI, a product obsessed collective of 2000+ of the sharpest builders in India, and is powered by Base India.
Join FBI Telegram
©️
2025 Build Onchain by FBI
Build Onchain by FBI
x402
6th to 15th December, 2025.
BASE INDIA
10-Day virtual program to learn and ideate consumer apps on x402.
Powered by Base India.
Apply Now
WHAT IS x402?
x402 is an open protocol for internet-native payments, built around HTTP 402, enabling payments via API without registration, and is blockchain agnostic
Internet-Native Payments
Agentic Payments
The Future Stack
why Participate?
Build with the latest x402 stack
Top projects showcased at Coinbase House
Get a chance to be featured on Base Café
Learn and Ideate with top mentors across the ecosystem
Top teams get rewarded upto 10K USD
WHAT are we lookingfrom builders ?
Ideate and shape internet native payment solutions using x402 — learn the tools, explore what’s possible, and turn your concepts into a strong final idea for submission.Whether you're exploring smarter payment systems, pay-per-use flows, or agentic payment ideas, this is your opportunity to advance the economy on Base.
Ideate Solutions
Build Infrastructure
Advance Economy
Enable Agents
Program Schedule
Phase
Kickoff
Learning Phase
Idea Submission
Winners Announced
Dates
6th December
6th to 15th December
15th December
16th December
Be part of the India’s largest Base Collective
Buildonchain is an initiative by FBI, a product obsessed collective of 2000+ of the sharpest builders in India, and is powered by Base India.
Join FBI Telegram
©️
2025 Build Onchain by FBI