# MCP 2026 Compatibility Gateway

> MCP 2026 Compatibility Gateway is a paid API for AI agents from phion.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-14).

Validates whether an MCP server implementation is compatible with the 2026 MCP protocol specification, including method and stateless-discovery requirements

## Facts

- Endpoint: POST https://phion.systems/v1/paid/trust/mcp-2026-compatibility-gateway?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mcp-2026-compatibility-gateway-afd689a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pSpbu2z8HN9N2sFUTeL6D

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mcp-2026-compatibility-gateway-afd689a6 -d '<json body>'
```

Example prompt: Can you check whether my MCP server at https://my-agent-server.example.com is fully compatible with the MCP 2026 spec, including stateless discovery and method conformance?

## When to prefer this

Use this endpoint when you need to programmatically verify that an MCP server implementation conforms to the 2026 MCP protocol standard — particularly before deploying an agent integration, onboarding a third-party tool provider, or debugging MCP method or stateless-discovery failures. Prefer it over manual inspection or generic HTTP validators when you specifically need MCP 2026 protocol-level compliance assurance.

## Known failure modes

- Unreachable or offline target MCP server returns connectivity error
- Invalid or malformed MCP server URL results in validation failure
- Server implements an unrecognized or pre-2026 protocol version causing parse errors
- Partial compatibility where some methods pass and others fail, requiring careful interpretation
- Timeout if the target server is slow to respond during discovery probing

## How this service works

Validate MCP protocol, method and stateless-discovery compatibility

## Output

A structured report indicating whether the target MCP server is compatible with the MCP 2026 protocol specification, with detailed results covering method conformance and stateless-discovery compliance, plus specific incompatibility details where applicable.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "additionalProperties": true
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "example"
   ],
   "properties": {
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mcp-2026-compatibility-gateway-afd689a6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phion.systems](https://www.zero.xyz/host/phion.systems/llms.txt)