AI agent frameworks

Every adapter wraps your framework’s normal call surface and inserts a check() step that returns an HTTP 402 challenge when payment is missing. The client pays on-chain, retries with proof, and the call goes through. Same shape across all 13 frameworks.

Available adapters

Framework	What it gates	Source
LangChain	LLMs, chains, agent tool endpoints	langchain
LangGraph	Compiled `StateGraph` execution	langgraph
CrewAI	Crews, tasks, agent tools	crewai
AutoGen	Conversations, callable tools	autogen
AG2	Multi-agent flows	(via AutoGen)
DSPy	Modules, programs, chains	dspy
LlamaIndex	LLMs, query engines, chat engines, ReAct agent tools	llamaindex
Pydantic AI	Agents, model calls	pydantic-ai
Vercel AI SDK	Model calls, tool calls	vercel-ai-sdk
Semantic Kernel	Chat completions, `KernelFunction`, plugins	semantic-kernel
Hugging Face	`InferenceClient`, `transformers` pipelines, `smolagents` tools	huggingface
Agno	Agno agents	agno
Google A2A	A2A endpoints (server side)	a2a

Common shape

Every adapter has the same three-method surface:

from algovoi_<framework> import AlgoVoi<Framework>

adapter = AlgoVoi<Framework>(
    api_base="https://api.algovoi.co.uk",
    api_key="algv_…",
    tenant_id="…",
    webhook_secret="algvw_…",
)

# 1. Check payment status before invocation
status = adapter.check(resource_id="premium-call")

# 2. If unpaid, surface a challenge to the client
if not status.paid:
    raise adapter.PaymentRequired(status.challenge)

# 3. Run the wrapped call
result = adapter.run(...)  # framework-specific

Picking a protocol

Each adapter supports x402, MPP, and AP2 on the same code path. Pick the one that matches your client:

x402 for HTTP-fronted endpoints. The most common case for LangChain or Vercel AI SDK servers.
MPP for JSON-RPC or MCP-server-backed tools. Use when the call is method-shaped, not URL-shaped.
AP2 for autonomous agents acting on a signed mandate.

See the protocol pages for detail: x402, MPP, AP2.

Chains

All 13 framework adapters support all 7 chains: Algorand, VOI, Hedera, Stellar, Base, Solana, and Tempo. Pass the network key when constructing the adapter (e.g. network="base-mainnet").

Versioning

All adapters are at v1.1.0 of the shared client surface. Behaviour and method names are identical across frameworks; only the wrapping layer changes. If you switch frameworks you keep the same AlgoVoi configuration.

ElizaOS plugin

@algovoi/plugin-elizaos is a native ElizaOS plugin (not a wrapping adapter). It registers three actions on the Eliza runtime so your agent can ask for, verify, and poll crypto payments across all 7 chains without holding any keys or fiat.

Passed the AlgoVoi Agent Trust Bench — 71/71 correct (100%) across adversarial payment profiles. Zero adversarial profiles settled.

npm install @algovoi/plugin-elizaos

Actions

Action	Trigger phrase examples	Returns
`CREATE_PAYMENT_REQUEST`	”invoice £9.99”, “ask for $20 on Solana”	`checkout_url`, `token`, `chain`, `expires_at`
`VERIFY_PAYMENT`	”verify tx abc123”, “confirm payment”	on-chain verification result
`CHECK_PAYMENT_STATUS`	”has token xyz been paid?”, “poll checkout”	`paid`, `status`, `tx_id`

Setup

import { algovoiPlugin } from "@algovoi/plugin-elizaos";

const character = {
  name: "PayAgent",
  plugins: [algovoiPlugin],
  // rest of character config
};

Set environment variables:

ALGOVOI_API_KEY=algvk_live_...            # required — from dash.algovoi.co.uk
ALGOVOI_DEFAULT_NETWORK=algorand_mainnet  # optional
ALGOVOI_DEFAULT_CURRENCY=GBP             # optional

Get an API key at dash.algovoi.co.uk/signup. The $1,000 free mainnet trial applies.

What it does not need

The plugin is a thin HTTP wrapper around api.algovoi.co.uk. Your agent needs no wallet, no private key, and no fiat custody — only the API key. Settlement goes direct on-chain customer-wallet → your merchant wallet. Source: github.com/chopmob-cloud/elizaos-plugin-algovoi

Get started

Platform

Concepts

Keystone

Agent Mesh

Substrate 2

Commercial

Open substrate

Payment protocols

Chains

Integrations

Help

Company

Available adapters

Common shape

Picking a protocol

Chains

Versioning

ElizaOS plugin

Actions

Setup

What it does not need

​Available adapters

​Common shape

​Picking a protocol

​Chains

​Versioning

​ElizaOS plugin

​Actions

​Setup

​What it does not need

Available adapters

Common shape

Picking a protocol

Chains

Versioning

ElizaOS plugin

Actions

Setup

What it does not need