The Banking Layer of Physical Trade
Letters of credit, standby instruments, and the SWIFT messages that move them — what each one does, and what it cannot do.
Overview
Payment against documents, not trust
Cross-border commodity trade settles through instruments designed so that neither party performs on faith. The documentary letter of credit is the core of it: the buyer's bank commits to pay the seller against a defined set of shipping documents, examined under ICC UCP 600 — the uniform rules adopted by banks worldwide.
Around that core sit standby instruments, performance bonds, and a family of SWIFT message types that are routinely misrepresented in the less reputable corners of the commodity market. Knowing what each message actually is protects you from procedures built on what they are not.
Capabilities
The instruments
Documentary LC (DLC)
Issued via SWIFT MT700 under UCP 600. The issuing bank pays the seller when presented documents — bill of lading, inspection certificates, invoice, insurance — comply with the credit's terms. Irrevocable by default under UCP 600.
Standby LC (SBLC)
Issued via SWIFT MT760. A guarantee that pays only if the buyer defaults — the backstop for term supply programs with monthly liftings, commonly issued for a year plus one day to cover twelve tranches.
Performance Bond
The seller-side counterweight: typically 2% of contract value, issued by the seller's bank, payable to the buyer if the seller fails to ship. Activates alongside the buyer's LC.
MT103
The actual funds transfer — the SWIFT message that settles payment, released against the complying documentary presentation.
MT799 / MT199
Free-format authenticated bank messages used for pre-advice or bank comfort. They carry information, not money, and create no payment obligation. Any procedure describing an "MT799 payment" is describing something that does not exist.
Confirmation
A second bank — typically in the seller's country — can add its own payment undertaking to the LC, insulating the seller from issuing-bank and country risk. Standard practice on new counterparty relationships.
Process
A documentary credit, end to end
Contract Fixes the Instrument
The SPA specifies the LC type, issuing/confirming banks, document set, and presentation period — before any instrument is opened.
Issuance (MT700)
Buyer's bank issues the credit; seller's bank advises (and confirms, if agreed). The seller checks every field against the SPA — discrepancies are cheaper to fix now than at presentation.
Ship & Present
Cargo loads, inspection certificates issue, the bill of lading follows. The seller presents the document set within the credit's presentation period.
Examination & Payment
Banks examine documents against the credit under UCP 600 standards. Complying presentation triggers payment via MT103. Discrepant documents trigger negotiation — which is why document discipline is a profit center.
Outcomes
Practical rules the desk lives by
- The LC must mirror the SPA — every tolerance, every document name, every date
- Confirmation is cheap insurance on first trades with a new issuing bank
- Presentation periods are deadlines, not suggestions; late documents forfeit protection
- No legitimate structure requires paying fees to "activate", "lease", or "monetize" an instrument
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