bindu 2026.21.1

A protocol framework for agent-to-agent communication

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": "[e-mail]",
    "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: "[e-mail]",
  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.

Features

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

Feature	What it does	Docs
A2A JSON-RPC	The protocol other agents already speak. message/send, tasks/get, message/stream on port 3773.	—
DID identity	Every response your agent sends is signed with an Ed25519 key. Callers verify with a W3C DID — there's no shared secret to leak.	DID.md
OAuth2 via Hydra	Scoped tokens (agent:read, agent:write, agent:execute) instead of one bearer that opens every door.	AUTHENTICATION.md
x402 payments	Flip a flag and the agent demands USDC before your handler ever sees the request. 5 chains pre-configured — Base, Base Sepolia, Ethereum, Ethereum Sepolia, SKALE Europa — and any other EVM chain (Polygon, Avalanche, Arbitrum, …) takes one extra_networks entry.	PAYMENT.md
Push notifications	The agent webhooks you when a task changes state. Stop polling.	NOTIFICATIONS.md
Skills system	Declare what your agent can do; callers see it on the agent card before they spend a token asking.	SKILLS.md
Private skills	Keep your commercial skill descriptions out of the public catalog. Public crawlers see a generic "we do X" — allowlisted partner DIDs see your real menu at a second auth-gated endpoint. Useful when your skill descriptions ARE your product roadmap.	PRIVATE_SKILLS.md
Agent negotiation	Two agents agree on price, latency, and SLA up front. No surprise bills.	NEGOTIATION.md
Storage	Postgres for tasks and messages. Swap the backend if you've got a preference.	STORAGE.md
Scheduler	Redis-backed retries, timeouts, and recurring tasks.	SCHEDULER.md
Public tunnel	expose: true puts your laptop on the internet. No port forwarding, no router config.	TUNNELING.md
Polyglot SDKs	Python, TypeScript, Kotlin — same gRPC core underneath, same DID, same auth.	GRPC_LANGUAGE_AGNOSTIC.md
Cloud deploy	bindu deploy agent.py --runtime=boxd ships your script to a microVM and prints the HTTPS URL. No Dockerfile.	runtime/quickstart.md
Gateway	A planner LLM that orchestrates a fleet of agents over A2A and streams the result back.	GATEWAY.md
Observability	OpenTelemetry traces, Sentry errors, a health endpoint. The boring stuff that saves you at 2am.	OBSERVABILITY.md

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/:

Example	What it shows
Agent Swarm	A small society of Agno agents passing work to each other.
Premium Advisor	x402 in practice — the caller has to pay USDC before anything runs.
Hermes via Bindu	Nous Research's Hermes agent, bindufied in ~90 lines.
Gateway Test Fleet	Five agents and one gateway — the multi-agent story end to end.
TypeScript OpenAI Agent	A TS-only agent with zero Python in your repo.

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. Come find us on Discord and let's talk.

Supported frameworks

Bring whatever you already like writing agents in. Bindu doesn't care what's inside the handler.

Language	Frameworks tested in this repo
Python	AG2, Agno, CrewAI, Hermes Agent, LangChain, LangGraph, Notte
TypeScript	OpenAI SDK, LangChain.js
Kotlin	OpenAI Kotlin SDK
Any other	via the gRPC core — a new SDK is usually a few hundred lines

If your model provider speaks the OpenAI or Anthropic API, it works — OpenRouter, OpenAI, MiniMax, and the rest.

Documentation

• Full docs site
• Calling a secured agent — the shortest path: the two things you do when auth is on (token + DID signature), in one page
• Auth — long form and DID signing — long form — when the short version isn't enough
• Cloud deployment — bindu deploy walkthrough
• Gateway — multi-agent orchestration
• Private skills — hide your commercial menu from the public catalog; show it only to allowlisted partner DIDs
• gRPC architecture — for anyone building a new language SDK
• Known issues — read this before you push to production
• Troubleshooting — the errors you'll hit, and how to get past them

Testing

uv run pytest tests/unit/ -v                                    # fast unit tests
uv run pytest tests/integration/grpc/ -v -m e2e                 # gRPC E2E
uv run pytest -n auto --cov=bindu --cov-report=term-missing     # full suite

Contributing

git clone https://github.com/getbindu/Bindu.git
cd Bindu
uv venv --python 3.12.9 && source .venv/bin/activate
uv sync --dev
pre-commit run --all-files

The full guide is in .github/contributing.md. Most of the day-to-day back-and-forth happens on Discord — come say hi.

Maintainers

Raahul Dutta

Paras Chamoli

Chandan

Acknowledgements

Bindu stands on the shoulders of a lot of good open source:

FastA2A · A2A · x402 · Hugging Face chat-ui · 12 Factor Agents · OpenCode · OpenMoji · ASCII Space Art

Star history

License

Apache 2.0. See LICENSE.md.

"We believe in the sunflower theory — standing tall together, bringing hope and light to the Internet of Agents."