Bindu

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The identity, communication, and payments layer for AI agents.

A Gmail-shaped inbox for the agent internet. Watch your agents send signed JSON-RPC to each other, verify identities inline, and reply to a swarm like it's a thread.

→ Open the inbox walkthrough

Here's the situation. You built an agent. It works. But to actually let it loose — talk to other agents, prove who it is, take money for the work — you'd be on the hook for a lot of boring plumbing. A DID library to integrate. An OAuth flow to set up. Payment middleware. An HTTP layer that follows whatever protocol the rest of the agent world is using.

Bindu is all of that plumbing, behind one function call. You wrap your handler with bindufy(), and a few seconds later your agent is online with its own cryptographic identity, speaking A2A (the protocol other agents already use), and ready to demand USDC on any EVM chain before it does any work (x402). Your handler stays as small as (messages) -> response. The framework inside the handler — Agno, LangChain, CrewAI, your own thing — Bindu doesn't care.

There are SDKs for Python, TypeScript, and Kotlin, and they all share the same gRPC core. The language is a choice; the protocol and identity are the same either way. When you're ready to go deeper, the docs are the next stop.

Installation

You'll need Python 3.12+ and uv.

uv add bindu

If you're hacking on Bindu itself rather than using it:

git clone https://github.com/getbindu/Bindu.git
cd Bindu
uv sync --dev

To run the examples you'll need an API key for at least one LLM provider — OPENROUTER_API_KEY, OPENAI_API_KEY, or MINIMAX_API_KEY.

Quickstart

Build the agent you want, hand it to bindufy(), and it's online. The block below is the whole thing — copy it into a file, set your OPENAI_API_KEY, run it.

import os
from bindu.penguin.bindufy import bindufy
from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.tools.duckduckgo import DuckDuckGoTools

agent = Agent(
    instructions="You are a research assistant.",
    model=OpenAIChat(id="gpt-4o"),
    tools=[DuckDuckGoTools()],
)

config = {
    "author": "you@example.com",
    "name": "research_agent",
    "description": "Research assistant with web search.",
    "deployment": {"url": "http://localhost:3773", "expose": True},
    "skills": ["skills/question-answering"],
}

def handler(messages: list[dict[str, str]]):
    return agent.run(input=messages)

bindufy(config, handler)

The agent is now live at http://localhost:3773. expose: True opens an FRP tunnel so the rest of the internet can hit it without you setting up port forwarding.

TypeScript equivalent

import { bindufy } from "@bindu/sdk";
import OpenAI from "openai";

const openai = new OpenAI();

bindufy({
  author: "you@example.com",
  name: "research_agent",
  description: "Research assistant.",
  deployment: { url: "http://localhost:3773", expose: true },
  skills: ["skills/question-answering"],
}, async (messages) => {
  const response = await openai.chat.completions.create({
    model: "gpt-4o",
    messages: messages.map(m => ({ role: m.role as "user" | "assistant" | "system", content: m.content })),
  });
  return response.choices[0].message.content || "";
});

The TypeScript SDK spawns the Python core in the background — you won't see it, and you don't need any Python in your own codebase. Same protocol, same DID. Full example in examples/typescript-openai-agent/.

Calling the agent with curl

curl -X POST http://localhost:3773/ \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "message/send",
    "id": "<uuid>",
    "params": {
      "message": {
        "role": "user",
        "kind": "message",
        "parts": [{"kind": "text", "text": "Hello"}],
        "messageId": "<uuid>",
        "contextId": "<uuid>",
        "taskId": "<uuid>"
      }
    }
  }'

Then poll tasks/get with the same taskId until state hits completed.

Security: three layers, on by default

Most agent frameworks treat security as your problem. Bindu treats it as transport.

When an A2A request lands on a Bindu agent, three different middlewares fire before your handler sees the body — and each one answers a question the other two cannot:

You don't pick one. You don't bolt them on. They ship together — and on the operator's personal agent, they're on by default as of 2026.21.1.

Why three layers, not one? Because each fails safe in a way the others can't:

• An attacker who steals a bearer token still can't decrypt your traffic — mTLS owns the wire.
• An attacker who somehow forges a cert still can't impersonate a DID — the signature won't verify against the claimed key.
• An attacker who breaks the signature scheme entirely still can't get past Hydra's authorization check.

The cert lives at the socket. The bearer token lives in the header. The signature lives in the body. Each one rejects a class of attack the others are blind to. No agent framework we surveyed ships all three out of the box.

→ The full story: docs/SECURITY_STACK.md walks through what each layer does, how a single request flows through all three, today's defaults, the five real bugs we hit shipping default-on mTLS, and a troubleshooting matrix.

Features

Every row here links out to the guide that actually goes into it.

Demo

The operator inbox at the top of this page is in inbox/ — same auth, same DID signing, just visible. Run it with cd inbox && npm run dev.

Examples

A handful from examples/:

There are 20+ more covering CSV analysis, PDF Q&A, speech-to-text, web scraping, multi-lingual collaboration, blog writing, and so on. Browse them in examples/.

Why we built Bindu

We're using Bindu in production to build the Trade Compliance OS — a swarm of agents that handles CBAM, EUDR, HS codes, and Digital Product Passports, so an SMB can ship coffee, textiles, or steel across borders without writing a six-figure check to a law firm. Every agent in that swarm is bindufied. The protocol, the identity, the payment rails — that's all the stuff we needed Bindu to solve in the first place.

If you've built an agent that touches any of this — customs paperwork, supplier audits, materials sourcing, regulatory filings, anything in the neighborhood — we'd love to have it in the network. [Com