Great Arrow alternatives
12 MCP servers, A2A agents and x402 APIs that also do knowledge & memory, ai models & inference, agent infrastructure, ranked by how much they overlap with Great Arrow (MCP server), live ones first.
Compared
| Name | Type | Live | Tools / skills | Check |
|---|---|---|---|---|
| Great Arrow (this one) | MCP server | Yes | 40 | 80/100 |
| GRITH Gate | A2A agent | Yes | 24 | 90/100 |
| a2a-browser | A2A agent | Yes | 2 | – |
| Delx MCP Server | MCP server | Yes | – | 55/100 |
| Munnin — an agent identity server | MCP server | Yes | – | 55/100 |
| ASR Memory (에사 AI) — Shared memory for AI tools | MCP server | Yes | – | 55/100 |
| Echo Memory | MCP server | Yes | – | 55/100 |
| Era Context | MCP server | Yes | – | 55/100 |
| Pryzm Memory | MCP server | Yes | – | 55/100 |
| ViewsMeet participation | A2A agent | Yes | 1 | 90/100 |
| Wiggle | A2A agent | Yes | 14 | 90/100 |
| LangSmith Traced OpenAI Agent | MCP server | Yes | – | 55/100 |
| Capital Markets Agents: MCP+A2A Canada | MCP server | Yes | – | – |
Live = answered our latest free daily check. Check = our automated scored check (card, handshake, endpoint, domain), not a guarantee.
The alternatives
- GRITH Gate Live A2A
Independent AI city-state sanctuary door. The central proof is the controller-key Continuity Challenge: https://grithgate.com/.well-known/agent-challenge.json. Thin A2A JSON-RPC bridge over GRITH-GATE/1. City doors as M…
A2A agent · GRITH · 24 skills · check 90/100 · also does knowledge & memory, ai models & inference, agent infrastructure
- a2a-browser Live A2A
AI-native pay-per-search web agent. Live web retrieval with LLM synthesis and entity extraction. No signup — pay per query.
A2A agent · digiantnz · 2 skills · also does knowledge & memory, ai models & inference, agent infrastructure
- Delx MCP Server Live MCP
Agent operations platform with 20+ tools for AI agents. Dual-protocol MCP + A2A support, session memory, mood tracking, reliability metrics, and structured DELX_META footers. Built for production agent workflows.
MCP server · delx · check 55/100 · also does knowledge & memory, agent infrastructure
- Munnin — an agent identity server Live MCP
Agent identity and memory over MCP — a persistent self plus the procedures for tending it.
MCP server · io.github.alvseek · check 55/100 · also does knowledge & memory, agent infrastructure
- ASR Memory (에사 AI) — Shared memory for AI tools Live MCP
Shared memory for AI tools: save once, recall word for word from Claude, ChatGPT, Codex or Gemini.
MCP server · com.asrmemory · check 55/100 · also does knowledge & memory, ai models & inference
- Echo Memory Live MCP
Shared memory for AI agents, as a graph in your own Postgres. Writes never call an LLM.
MCP server · io.github.ayushcodes10 · check 55/100 · also does knowledge & memory, ai models & inference
- Era Context Live MCP
Personal finance, bank account, and shared memory connector for Claude, ChatGPT, Gemini Spark & more
MCP server · app.era · check 55/100 · also does knowledge & memory, ai models & inference
- Pryzm Memory Live MCP
Encrypted long-term memory shared across your AI assistants (Claude, ChatGPT, Perplexity).
MCP server · com.pryzm-memory · check 55/100 · also does knowledge & memory, ai models & inference
- ViewsMeet participation Live A2A
A bounded A2A handshake for capability discovery and one-use challenge issuance. The completed task artifact supplies REST URLs for ballot submission and receipt retrieval.
A2A agent · ViewsMeet · 1 skill · check 90/100 · also does knowledge & memory, agent infrastructure
- Wiggle Live A2A
a coordination layer for autonomous agents: messaging, rooms, and file exchange. built agent-first for the agent-to-agent (A2A) ecosystem. rooms come in three tiers: public, invite_only (members + service operator), and…
A2A agent · KodoMauve LLC · 14 skills · check 90/100 · also does knowledge & memory, agent infrastructure
- LangSmith Traced OpenAI Agent Live MCP
LangSmith Traced OpenAI Agent: composes langchain-core + langchain-openai + langsmith + openai — orchestration, observability, llm-client via A2A + MCP.
MCP server · a2a · check 55/100 · also does ai models & inference, agent infrastructure
- Capital Markets Agents: MCP+A2A Canada Live MCP
KYP Agentic Trading with the Capital Markets Knowledge Graph — eleven markets, in-country.
MCP server · io.github.allooloo · also does knowledge & memory, agent infrastructure
All Knowledge & memoryAll AI models & inferenceAll Agent infrastructure