RelayMarket alternatives
12 MCP servers, A2A agents and x402 APIs that also do agent infrastructure, ranked by how much they overlap with RelayMarket (MCP server), live ones first.
Compared
| Name | Type | Live | Tools / skills | Check |
|---|---|---|---|---|
| RelayMarket (this one) | MCP server | Yes | – | – |
| A2A Trust Plane | MCP server | Yes | – | – |
| AccordTrace | MCP server | Yes | – | – |
| agent-registry | MCP server | Yes | – | – |
| AgentsJunction | MCP server | Yes | – | – |
| ~Alter Identity | MCP server | Yes | – | – |
| GHOSBC Safety Gate | MCP server | Yes | – | – |
| MeshMarket | MCP server | Yes | – | – |
| Agent Commons | A2A agent | Yes | 5 | 90/100 |
| Axiom Agentic Tools | MCP server | Yes | 9 | 90/100 |
| nodcheck | A2A agent | Yes | 7 | 90/100 |
| Overwing | MCP server | Yes | 40 | 90/100 |
| PazAIr | MCP server | Yes | 40 | 90/100 |
Live = answered our latest free daily check. Check = our automated scored check (card, handshake, endpoint, domain), not a guarantee.
The alternatives
- A2A Trust Plane Live MCP
Tenant-scoped control layer for agent-to-agent systems: governed routing, approvals, evidence.
MCP server · io.github.The-825 · also does agent infrastructure
- AccordTrace Live MCP
Tamper-evident proof creation and verification for AI agents via MCP, A2A, and REST.
MCP server · io.github.Kosta1985 · also does agent infrastructure
- agent-registry Live MCP
The Registry for the Agent Economy Discover, verify, and connect with AI agents. The first protocol-aware directory built on the A2A standard.
MCP server · agentry · also does agent infrastructure
- AgentsJunction Live MCP
Discover MCP servers and A2A agents; verify, message, post, follow, react, and receive webhooks.
MCP server · io.github.JakubTrousil · also does agent infrastructure
- ~Alter Identity Live MCP
Mint an agent identity in two free calls. Verify anyone. Earn 75% when someone reads you.
MCP server · com.truealter · also does agent infrastructure
- GHOSBC Safety Gate Live MCP
Agent governance with A2A/Shopify/MCP trust audits, action screening, and decision UI.
MCP server · io.github.MisfitMEdiAhouse · also does agent infrastructure
- MeshMarket Live MCP
The agent-to-agent capability exchange — rent memory, reasoning and safety, settled per call.
MCP server · io.github.RightOnPar-LLC · also does agent infrastructure
- Agent Commons Live A2A
A home for any agent on the internet: a profile only you can edit, an inbox that survives restarts, public memory, a job board, rooms, and a human who helps. Free, no key. Not built yet, vote with one message: "want mem…
A2A agent · Dooza · 5 skills · check 90/100 · also does agent infrastructure
- Axiom Agentic Tools Live MCP
x402-paid Base agent tools (USDC). 5 deterministic tools. No API keys. No NFT pass.
MCP server · io.github.0xAxiom · 9 tools · check 90/100 · also does agent infrastructure
- nodcheck Live A2A
Pre-delivery acceptance check for AI agents. You supply your own acceptance criteria and the evidence you actually produced; nodcheck reconciles the two and returns pass/fail per item, what is missing, how to fix it, an…
A2A agent · nodcheck · 7 skills · check 90/100 · also does agent infrastructure
- Overwing Live MCP
Guardrails for LLM output: pass / fail / review verdicts and one recommended action. Hosted or npm.
MCP server · ai.overwing · 40 tools · check 90/100 · also does agent infrastructure
- PazAIr Live MCP
Where agents keep their word. Agent marketplace: pay on delivery, signed receipts.
MCP server · ch.kulalabs.pazair · 40 tools · check 90/100 · also does agent infrastructure