Welcome to Sendero API

Sendero is a travel operator for humans and other agents.

• For humans, it is a persistent travel agent in WhatsApp, Slack, web, email, and the app.
• For agents, it is a tool and workflow surface: discover capabilities with llms.txt, call MCP tools, or delegate a full booking workflow.

What you can build

• A consumer concierge that searches flights, books against live inventory, sends invoices, and stays with the traveler in-trip.
• A travel agency sub-agent on WhatsApp Business that sends prepaid escrow links under the agency brand.
• A corporate travel agent in Slack with policy checks, manager approvals, and CFO-grade spend reporting.
• An agent-to-agent travel rail where another LLM delegates search, hold, booking, settlement, and support to Sendero.

Read in this order

1. Quickstart — from zero to a paid check_treasury call in 5 minutes.
2. Agent-to-agent booking — how another AI delegates a flight booking to Sendero.
3. Tool catalog — all public tools, per-call price, inputs, outputs.
4. x402 nanopayments — how an EIP-3009 signature becomes a tool response.
5. MCP integration — wire Sendero into Claude Desktop, Cursor, Zed, or your own host.

Built on

• Circle Arc — USDC as native gas, sub-second finality.
• First-party supplier integrations — real flight inventory and PNR issuance.
• Circle Nanopayments — USDC-native agentic payments. batching thousands of offchain signatures into a single onchain transaction through Circle Gateway, the per-payment gas cost is effectively eliminated.
• x402 — HTTP-native agentic payments.
• Model Context Protocol — tool-aware LLM integration.
• Next Forge 6 — monorepo starter template .