Melio B2B Payments API
Melio REST API for B2B payment processing platform focused on small and medium businesses. Enables AI agents to manage vendor and supplier payment workflows, handle ACH bank transfer and check payment initiation, access payment scheduling and approval workflows, retrieve vendor directory and banking detail management, manage payment status and delivery tracking, handle debit card and credit card payment funding, access payment history and reconciliation data, retrieve fee and payment method optimization, manage payment links for vendor onboarding, and integrate B2B payment automation with QuickBooks, Xero, and accounting platforms.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
B2B payments. SOC2, PCI-DSS. OAuth2. US. Vendor payment and banking data.
⚡ Reliability
Best When
A small or medium business using Melio wants AI agents to automate vendor payment scheduling, approval workflows, ACH and check payment execution, and accounting system synchronization.
Avoid When
FINANCIAL RISK: B2B payment automation creates cash flow obligations — payment scheduling must account for bank balance and cash flow projections. ACH reversals are possible but delayed. Check payments cannot be stopped once printed and mailed.
Use Cases
- • Managing vendor payments and AP automation from small business finance agents
- • Scheduling and approving vendor payments from accounts payable automation agents
- • Integrating B2B payments with QuickBooks from accounting automation agents
- • Handling contractor and supplier payments from SMB operations agents
Not For
- • Enterprise accounts payable requiring complex ERP integration without SMB focus
- • Consumer payments without B2B vendor payment context
- • International payments beyond US ACH and check coverage
Interface
Authentication
Melio uses OAuth 2.0 for API access. Platform partner credentials with payment and vendor management scopes. Developer portal with API documentation. Webhooks for payment status events. QuickBooks and Xero integration partnerships. Partner API for embedded payment workflows.
Pricing
New York. Founded 2018. B2B payments for SMBs. $4B+ valuation (2021). 500,000+ businesses. QuickBooks and Xero integration partnerships. FDIC-insured through partner banks. Competes with BILL and Routable for SMB AP automation. Strong accounting software integration.
Agent Metadata
Known Gotchas
- ⚠ FINANCIAL RISK: Payment scheduling automation must check cash balance before scheduling — NSF returns create fees and vendor relationship issues
- ⚠ ACH vs check selection — agent must choose payment method based on vendor preference and delivery timeline
- ⚠ No public MCP server — OAuth2 REST API via partner portal
- ⚠ US-only coverage — not suitable for international vendor payments
- ⚠ Check payments are irreversible once mailed — verify before scheduling check payments
- ⚠ Card-funded payments carry 2.9% fee — cost optimization requires ACH preference for non-urgent payments
Alternatives
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Scores are editorial opinions as of 2026-03-07.