Calculate cross-border FX savings

Machine-to-Machine Conformance API · calculate-fx-savings

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Arithmetic comparison of a USDC settlement against comparator percentages YOU supply (bank_fee_pct, custodial_fee_pct) across 14 global fiat currencies. The comparators are assumptions, not measurements of any bank or provider; no protocol fee is deducted on this rail.

Honest Scope Guarantee

Arithmetic comparison of this rail's published fee schedule against comparator rates supplied as inputs (e.g. SWIFT 3.5%, Deel 2.0%). The comparator figures are assumptions you can override, not measurements of your bank.

Run in Playground (Free) Buy Card Credits Agent Quickstart

Quickstart & Execution

cURL (20 Free Calls/Day • Zero Authentication Required)

curl -X POST https://api.code402.dev/v1/tools/calculate-fx-savings/call \
  -H "content-type: application/json" \
  -d '{"amount_usdc":50000,"currency":"BRL"}'

No API key needed for the free daily tier. When daily quota exhausts, the endpoint replies with HTTP 402 Payment Required specifying the exact USDC amount. Machines sign an EIP-3009 transfer on Base L2; human engineers buy card credits. Every paid execution returns a cryptographically signed XDR-1 receipt for zero-knowledge audit trails.

Input Parameters

Field	Type	Meaning & Constraints
`amount_usdc`	`number`	Gross invoice settlement volume in USD/USDC.
`amount_usd`	`number`	Gross invoice settlement volume in USD/USDC (alias).
`amount`	`number`	Gross invoice settlement volume in USD/USDC (alias).
`currency`	`string`	Target currency for local comparison (e.g. EUR, GBP, BRL, INR, ARS, PHP, NGN, SGD).

Response Format

Deterministic JSON payload fields: tool, amount_usdc, currency, legacy_swift_fee_usd, deel_fee_usd, code402_protocol_fee_usd, retained_savings_usd, pct_retained, local_currency, scope. Paid responses also carry an offline-verifiable receipt object (XDR-1, secp256k1 signature recoverable to the authorized signer).

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