Cross-Border Payment Cost Check

Note (dated 2026-08-04): a chain composes independent computations performed in an analytical order. No step's output is carried into the next step by the execution model; each step computes from its own declared inputs. This is true of every chain on this site, including chains whose per-step copy below reads as a data handoff.

Three independent recomputes on your cross-border payment. Step 1 itemizes the invoice's cost stack: FX spread, method fee, VAT or reverse-charge, documentary-credit, and reconciliation cost, as a percentage of invoice value. Step 2 recomputes the corridor's declared cost gap against the hardcoded G20/FSB roadmap targets for the year you declare. Step 3 models the same corridor on a USDC stablecoin rail so you can see the cheaper alternative side by side. Every figure is caller-declared; the page makes no live FX or rate calls. No personal data is processed.

OpenChainGraph · 4 Steps analytics mandate Hash-Anchored §4 chain_depth:4 Client-Side · Zero PII

Chain Stages · 4 Steps

1 ROOT node

Cross-Border B2B Fee Calculator art-367-compute-cross-border-fees

Itemizes the caller-declared cross-border B2B invoice cost stack: FX spread cost, method/correspondent fee, VAT or reverse-charge cost, documentary-credit cost, and reconciliation cost, plus total cost as a percentage of invoice value

MCP Call · compute_cross_border_fees

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "compute_cross_border_fees",
    "arguments": {
      "origin_country": "US",
      "dest_country": "GB",
      "invoice_amount": 10000,
      "fx_spread_bps": 150,
      "method_fee": 25,
      "vat_rate": 0,
      "doc_cost": 0,
      "recon_cost": 0
    }
  },
  "id": 1
}

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2 STEP node

G20/FSB Corridor Cost-Gap Calculator art-549-g20-corridor-cost-gap

Recomputes the caller-declared corridor cost gap in basis points against the hardcoded G20/FSB target for the declared year, with a meets_target verdict

MCP Call · check_g20_corridor_cost_gap

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "check_g20_corridor_cost_gap",
    "arguments": {
      "as_of": "2026-10-01",
      "corridor_pair": {
        "send_country": "US",
        "receive_country": "MX"
      },
      "observed_cost_bps": 250,
      "send_amount_basis": "USD_200",
      "target_year": 2027
    }
  },
  "id": 2
}

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3 STEP node

Stablecoin Corridor Economics Model art-250-model-stablecoin-corridor-economics

Models the all-in cost of the same corridor on a USDC stablecoin rail (on-ramp, chain fee, off-ramp, FX spread, float savings) against the traditional correspondent benchmark, with break-even send amount

MCP Call · model_stablecoin_corridor_economics

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "model_stablecoin_corridor_economics",
    "arguments": {
      "send_amount_usd": 10000,
      "on_ramp_fee_pct": 1.0,
      "chain_fee_usd": 0.01,
      "off_ramp_fee_pct": 0.8,
      "fx_spread_pct": 0.5,
      "correspondent_cost_pct": 6.0
    }
  },
  "id": 3
}

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4 TERMINAL node

Agent Action Audit Trail Aggregator cry-05-agent-action-audit-trail-aggregator

Produces session_receipt_root, the Merkle root over the run's execution_hashes (final stage)

MCP Call · aggregate_execution_receipts

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "aggregate_execution_receipts",
    "arguments": {
      "artifacts": [
        ""
      ]
    }
  },
  "id": 4
}

Question: My supplier invoiced $10,000 from Germany with a 1.5% FX spread and $25 wire fee. What is the true all-in cost and does the corridor meet the G20 target? Run the AINumbers MCP tool `run_chain` with {"chain":"cross-border-payment-cost-check"} and read `art-367-compute-cross-border-fees.total_cost`. Re-run with `inputs` for `art-367-compute-cross-border-fees`, reusing the values that result echoed, with `fx_spread_bps` set to 300. Compare the same field. Verify: call `verify_execution_hash` (https://mcp.ainumbers.co/mcp) with `claimed_hash` set to `composite_execution_hash` and the full `composite_artifact`. Ledger, for a human re-check: https://ledger.ainumbers.co/ PII rule: send synthetic or anonymised inputs only. The MCP server runs these kernels and logs no payloads. Chain page: https://ainumbers.co/chaingraph/chains/cross-border-payment-cost-check.html

Cross-Border Payment Cost Check

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