Igentix

Overview

Igentix is a testnet demonstration platform that lets AI agents such as Claude and ChatGPT autonomously discover, buy, and pay for services on Radix. An agent connects to Igentix through a Model Context Protocol (MCP) endpoint and can then complete a full purchase — find a priced service, pay for it, and receive the result — with no gas token and no wallet pop-up. Everything runs on the Radix Stokenet testnet, so the tokens it moves carry no real value.

x402 and AP2

Igentix builds on two emerging open standards for the agent economy. x402 is an HTTP-native payment protocol initiated by Coinbase in 2025 that activates the long-reserved 402 Payment Required status code: a server answers a request with machine-readable payment terms (price, currency, receiving account, network), the client authorizes an exact-amount payment, a facilitator settles it on-ledger and can sponsor the network fee, and the server returns the resource. AP2 (Agent Payments Protocol), announced by Google in 2025, adds the authorization layer — a cryptographically signed mandate, structured as an SD-JWT verifiable credential, that captures what a human authorized: which items and payees are allowed, a per-payment cap and total budget, a recurrence schedule, and a validity window. x402 moves the payment; AP2 records the authority behind it. Igentix settles AP2-authorized payments over x402 in USDC.

Ledger-enforced spending policy

Both standards leave enforcement open: a mandate is authenticated policy, but whoever executes the payment must still choose to honour it. Igentix closes that gap by anchoring the limits on-chain. An AP2 spend mandate's allowed payee, per-day cap, total budget, number of days, and time window are pinned to the Radix ledger, which rejects any payment that breaches them even if the Igentix service itself is compromised. Every payment is also checked against a spending policy before it settles — a hard cap per transaction, an allowlist of callable methods and on-chain components, and a threshold above which a human must co-sign in their wallet. A leaked agent key cannot move funds beyond these bounds.

Demos and MCP tools

Once an agent is connected, it can run a set of demos exposed as MCP tools. Two entry-level demos pay on-chain services in XRD from a shared demo treasury and need no setup: buying a single access key, and bundling two services into one atomic, all-or-nothing purchase. Four further demos spend the user's own USDC — paying for off-chain work with a tamper-proof on-chain receipt, metering thousands of sub-cent requests that batch-settle in a single payment, routing a large payment to a 2-of-2 approval treasury that waits for a human co-sign, and renewing a daily subscription under a signed AP2 spend mandate. The endpoint also exposes read-only tools to list, search, and inspect the available services. A companion agent-payments toolkit in the ecosystem is AgentWallet for Radix.

Connecting an agent

An agent connects by adding https://demo.igentix.app/mcp as a custom MCP connector — in Claude via Customize → Connectors → Add custom connector, or in ChatGPT via developer-mode Connectors. The shared endpoint runs the two XRD demos from a common treasury. To run the USDC and AP2 demos, a user opens the Igentix setup flow, connects a Radix Wallet, funds a capped and revocable Agent Vault, and mints a personal endpoint of the form demo.igentix.app/mcp/u/<token>; the agent then pays from that vault under the user's own caps.

External Links

• Igentix — demo gallery
• x402 & AP2, explained (Igentix)
• x402.org — protocol site