Developers

ChargeGuard for AI agents & developers

Every piece of ChargeGuard reference intelligence is available outside the app: an MCP server for ChatGPT, Claude and every MCP client, a public REST API, and a free npm CLI. No account needed, read-only, free.

MCP server

Streamable HTTP, stateless JSON-RPC 2.0, POST only. Works as a ChatGPT custom connector (Developer mode), in Claude, Cursor, or any MCP client.

Endpoint: https://www.trychargeguard.com/mcp
Auth: none (read-only)
Transport: MCP streamable HTTP (JSON responses)

Connect in ChatGPT

Settings → Connectors → Create (Developer mode required)
Paste https://www.trychargeguard.com/mcp
The 4 tools appear in your toolset. Ask "what does Visa reason code 13.2 require?"

Tools

list_reason_codes
Lists the 9 covered card-network reason codes (Visa, Mastercard, Amex) with one-line summaries.
lookup_reason_code
One code: what it means, the evidence that wins the representment, the response window, full guide URL.
get_response_deadlines
Response windows per gateway (Stripe, PayPal, Braintree, Adyen, Shopify Payments) and per network.
request_chargeback_audit
Submits the free store audit through the same pipeline as the website form (rate-limited, spam-checked).

Public REST API

Same data as plain JSON. Read-only, no auth, cached 24h.

Method	Path	Returns
GET	/api/public/reason-codes	All 9 reason codes. Optional ?network=visa\|mastercard\|amex
GET	/api/public/reason-codes/{slug}	One code: meaning, winning evidence, window, gateway notes
GET	/api/public/deadlines	Response windows per gateway and network
POST	/api/audit-request	Free store audit. Body: store_url, email, company, platform, notes

npm CLI

npm install -g chargeguard

chargeguard codes            # the 9 reason codes
chargeguard code 13.2        # meaning, winning evidence, window
chargeguard deadlines        # windows per gateway and network
chargeguard audit --url https://mystore.com \
  --email [email protected] --company "My Store"

Package: npmjs.com/package/chargeguard · zero dependencies, Node 18+, MIT.

Go further

Want the full pipeline (dispute sync, AI-drafted evidence letters, deadline tracking, multi-gateway)? That is the ChargeGuard app, from $149/mo flat. Need humans on it? Done-for-you defense. Questions about the API or MCP: contact us.