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These guides walk you through implementing Agentcard, step by step. There are two ways to put a card in your users’ agents’ hands:

Card attachment

The user attaches a card they already have. No wallet to fund — the agent spends on the user’s own card, within the limits they set.

Card creation

Issue brand-new virtual cards funded from a wallet, with per-card limits and single- or multi-use behavior.
The fastest way to production is card attachment: the user connects, brings their own card, and your agent can spend — no wallet funding, no deposits to wait on. Implement it in three steps:
1

User authentication

Connect the user to Agentcard from inside your own app. You build the screens; we send the one-time code and hand back the user’s token.Follow the user authentication guide.
2

Card attachment

The user attaches their own Visa card for their agent to spend with — no KYC, no wallet funding.Follow the card attachment guide.
3

MCP integration

Plug the Agentcard MCP server into your agent so it can see and use the card.See MCP server.

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API basics

Every guide calls the same API: one base URL (https://api.agentcard.sh), a platform access token in the Authorization header, and a single error envelope everywhere. The API reference covers all of it, endpoint by endpoint, with a live playground.