FullSeam builds AI agents for corporate accounting teams that automate manual tasks such as accounts payable, accounts receivable, and reconciliation. The agents integrate with existing accounting software to handle vendor communication, payment recording, and updating financial records. The founding team previously built TaxProper, which was acquired by Opendoor in 2022. FullSeam is part of Y Combinator's Winter 2026 batch.
FullSeam
ActiveAI agents for corporate accounting teams
Total raised
$500K
1 round
Stage
Seed
Jan 2026
Team
1-10
since 2026
Pricing
—
Founded
2026
Agent-ready
—
AI agents for corporate accounting teams
Automates accounts payable (AP) workflows
Automates accounts receivable (AR) workflows
Automated account reconciliation
Integrates with existing accounting software
Handles vendor communication automatically
Records payments and updates financial records
Built by a team that previously created TaxProper (acquired by Opendoor)
12/100
Early
MCP server
Public API
Webhooks
OAuth 2.0
SDKs
No public agent surfaces detected yet.
Jan 2026 Seed $500K ● Y Combinator
Capital network
$500K raised ·1 backer·10 network links
- Backers1
- Shared portfoliocompanies these backers also fund
- Extended networkfunds that co-invest alongside them
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- What does FullSeam automate?
- It builds AI agents that automate manual accounting tasks including accounts payable, accounts receivable, and reconciliation, plus vendor communication and record updates.
- Does FullSeam replace my accounting software?
- No. The agents integrate with existing accounting software to handle tasks like payment recording and updating financial records within your current stack.
- Who built FullSeam?
- The founding team previously built TaxProper, which was acquired by Opendoor in 2022.
- Who is FullSeam for?
- Corporate accounting teams that want to offload repetitive AP, AR, and reconciliation work to AI agents while keeping their existing systems.
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