ap2-iso20022: Agent-payment mandates → wire-valid ISO 20022

Bridge AP2 (Google's Agent Payments Protocol) and x402(Coinbase's HTTP-402) mandates into ISO 20022 pain.001 / pacs.008 records —with spending-cap, expiry and authorisation guardrails, and an MCPserver. These agentic-payment protocols authorise a payment; this libraryturns that authorisation into the bank-rail message that actually settles it— the rail the card networks and stablecoins don't cover.

Latest release: v0.0.1 — 5 MCP tools over stdio, pure-Python (only mcp),100% branch coverage, for Python 3.10+. Output feeds straight intopain001 / pacs008 to generate wire-valid XML.Part of the ISO 20022 MCP suite.

Why

An agent with a signed AP2 mandate (or an x402 payment authorisation) can proveit's allowed to pay — but nothing in those protocols emits the pain.001 abank needs to move the money. ap2-iso20022 is that missing hop. And becausemoving money is consequential, it only transforms and validates — producingthe ISO record is deliberately separate from generating and sending it, so theactual payment stays an explicit, guarded step.

Install

pip install ap2-iso20022
# or run the MCP server without installing:
uvx ap2-iso20022

MCP client config (e.g. Claude Desktop):

{
  "mcpServers": {
    "ap2-iso20022": {
      "command": "ap2-iso20022-mcp"
    }
  }
}

Flow: normalise → guardrail → convert

from ap2_iso20022 import bridge

# 1. Normalise the protocol payload into a canonical mandate.
mandate = bridge.from_ap2({
    "intent_id": "AP2-CoffeeRun-7",
    "payer": "Alice's Shopping Agent",
    "payer_account": "DE89370400440532013000",
    "merchant_name": "Blue Bottle Coffee",
    "payee_account": "GB29NWBK60161331926819",
    "amount": "12.50", "currency": "EUR", "memo": "oat latte",
    "spending_limit": "50.00",
    "signature": "eyJ...", "signature_type": "jws",
})

# 2. Guardrail before it becomes a payment.
check = bridge.check_mandate(mandate, as_of="2026-03-02T09:00:00")
assert check["ok"]          # required fields ok, within cap, not expired, signed

# 3. Convert to a pain.001 record that feeds pain001 -> wire-valid XML.
record = bridge.to_pain001(mandate)   # exact pain001 field names + JSON number amounts

Tools

Tool	What it does
`normalize_ap2`	AP2 mandate payload → canonical mandate.
`normalize_x402`	x402 payment payload → canonical mandate.
`check_mandate`	Guardrail: required fields, spending cap, expiry (with `as_of`), authorisation proof.
`to_pain001`	Canonical mandate → `pain.001` record (customer credit transfer).
`to_pacs008`	Canonical mandate → `pacs.008` record (FI-to-FI).

The output field names and types match what pain001 / pacs008 expect(validated against their JSON schemas), so to_pain001(mandate) → pain001generate_message → XSD-valid pain.001 with no glue.

Guardrails

check_mandate returns {ok, violations, warnings}:

required fields — payer/payee name + account, amount, currency
spending cap — amount <= max_amount when a cap is present
expiry — refuses an expired mandate when you pass as_of
authorisation proof — warns when no proof_type/proof_value is present

It never moves money; it tells you whether the mandate is safe to act on.

The suite

Part of a family of vendor-neutral, Python-native ISO 20022 MCP servers:

iso20022-mcp — unified gateway across the families.
pain001-mcp · pacs008-mcp — generate the XML this bridge feeds.
reconcile-mcp — statement/payment reconciliation.
camt-exceptions — E&I messages (cancellation, investigation).

Development

git clone https://github.com/sebastienrousseau/ap2-iso20022
cd ap2-iso20022
python -m venv .venv && . .venv/bin/activate
pip install -e . && pip install pytest pytest-cov ruff black mypy
pytest                      # 100% branch coverage gate
ruff check ap2_iso20022 tests && black --check ap2_iso20022 tests && mypy ap2_iso20022

Licence

Licensed under the Apache License, Version 2.0.

mcp-name: io.github.sebastienrousseau/ap2-iso20022

ap2-iso20022: Agent-payment mandates → wire-valid ISO 20022