Agentic commerce safety
0.5%flat gateway fee
No custodymerchant wallet control
Testnetbefore mainnet review
Webhooksoperational records
Let autonomous AI agents prepare checkouts and verify invoices without unchecked spending.
XPayr Agent Guardrails enforce per-transaction limits, daily rolling budgets, auto-approval thresholds, and chain whitelists across all 21 MCP tools.
AI Agent Guardrails mean an autonomous agent using @xpayr/mcp-server or POST https://xpayr.com/api/mcp operates strictly inside merchant-defined spending policies. Intents exceeding the auto-approval threshold are routed to the human approval queue before any wallet signature occurs.
01
Merchant defines per-tx cap, daily rolling limit, auto-approval threshold, and allowed networks.
02
AI agent submits a payment or settlement intent via MCP or REST API v1 (/api/v1/agent-intents).
03
XPayr policy engine evaluates the intent against active guardrails in real time.
04
Approved intents proceed to non-custodial execution; over-threshold intents enter the human approval queue.
Who pays gas?
MCP tool calls and policy evaluations are off-chain JSON-RPC 2.0 requests and consume zero blockchain gas.
Operational limit
XPayr never holds agent private keys or executes unlimited autonomous mainnet transfers without merchant policy authorization.
FAQ
What problem does this XPayr flow solve?
AI Agent Guardrails mean an autonomous agent using @xpayr/mcp-server or POST https://xpayr.com/api/mcp operates strictly inside merchant-defined spending policies. Intents exceeding the auto-approval threshold are routed to the human approval queue before any wallet signature occurs.
Who pays gas or network fees?
MCP tool calls and policy evaluations are off-chain JSON-RPC 2.0 requests and consume zero blockchain gas.
What should merchants not assume?
XPayr never holds agent private keys or executes unlimited autonomous mainnet transfers without merchant policy authorization.
Verifiable Open-Source & AI Protocol Registry
Publicly auditable SDKs, cryptographic evidence envelopes, and MCP registries.
Official 21-Tool MCP Server
Registered as io.github.xpayrcom/xpayr-mcp-server on the Official Anthropic MCP Registry and published as @xpayr/mcp-server on NPM and ghcr.io/xpayrcom/xpayr-mcp-server:latest.
Merkle Payment Evidence & ES256 Tokens
Verify on-chain settlement envelopes with @xpayr/payment-evidence and offline-verifiable ES256 wallet licenses with @xpayr/extension-kit.
30 Open-Source Repositories & RFC 9116
Inspect all 20 REST API v1 schemas interactively at api-docs.xpayr.com, review our 30 repositories at github.com/xpayrcom, and check /.well-known/security.txt & /.well-known/jwks.json.
Need to prove the flow before production?
Use testnet checkout, API docs, webhook guides, and operational explainers before asking for mainnet activation.