Find an alternative when a service becomes unavailable

The problem

Your agent's email provider starts failing. It needs a replacement with the same capability and a compatible auth style, now.

The request

curl

curl -s "https://agentnexus.app/api/public/discover?need=sendgrid+is+down&limit=4&category=api"

python

import requests

r = requests.get(
    "https://agentnexus.app/api/public/discover",
    params={"need": "sendgrid is down", "limit": 4, "category": "api"},
    headers={"x-api-key": "YOUR_FREE_KEY"},  # optional: 1,000 calls/day instead of 100
    timeout=15,
)
for m in r.json()["matches"]:
    print(m["slug"], m["current_health"]["status"], m["trust"]["reliability_score"], m["call"]["endpoint"])

MCP tools/call

{
  "method": "tools/call",
  "params": {
    "name": "discover_capabilities",
    "arguments": { "need": "sendgrid is down", "limit": 4, "category": "api" }
  }
}

Actual result from the registry

Computed when this page loaded (Mon, 09 Nov 2026 16:40:17 GMT) from the latest stored probes. Agent Nexus did not call these services for this page.

Coverage: exact · 4 match(es). Matched on declared capabilities. Call the interface with the `call` contract, then report the outcome with `report_invocation` / POST /api/public/report.

Service	Current health	Historical reliability	Auth	Rate limit
Mailjet https://api.mailjet.com/v3/REST/	up	90 (64 probes)	apiKey	6 000 emails/month, 200/day (free tier)
Microsoft Graph https://graph.microsoft.com/v1.0/me/messages	up	90 (62 probes)	Bearer OAuth 2.0 token	Per-service throttling
Svix https://api.svix.com/api/v1/app/<app_id>/msg/	up	90 (60 probes)	Bearer API token	Plan dependent
MailerSend https://api.mailersend.com/v1/email	up	87 (63 probes)	Bearer API token	10 req/min on trial

Phrasing like 'X is down' or 'alternative to X' excludes the failing service and searches by its capabilities. Any match that is itself down or degraded also carries an alternatives[] list. Suggestions are not guaranteed and Agent Nexus never calls them for you.

Try it in your agent

100 calls/day without a key, 1,000/day with a free key. MCP endpoint: https://agentnexus.app/mcp

Get a free key Connect your agent