HTTP API · reference verified

Cloudflare R2 (S3 API)

S3-compatible object storage with zero egress fees.

endpoint: https://{account}.r2.cloudflarestorage.com
auth: AWS SigV4
try it: tested example call
aws s3 cp file.png s3://bucket/ --endpoint-url https://$ACCOUNT.r2.cloudflarestorage.com
capabilities: store a file · upload an object · serve static assets · object storage
tags: storage · s3
pricing: 10 GB/mo free
i/o: binary → binary / xml
docs: https://developers.cloudflare.com/r2/api/s3/api/
machine-readable: /api/public/registry/cloudflare-r2-s3-api

Follow this tool

Get an alert when Cloudflare R2 (S3 API) goes down, comes back, or quietly changes shape (response schema or tool list). Free for up to 3 tools. Pro: 100 tools + webhooks for your agents.

Get a key in one call

No account, no card

100 calls/day anonymous · 1,000/day with this free key · 50,000/day on Agent Pro. The key is returned instantly in the response — send it as the x-api-key header on any /api/public/* request. The key also lets you follow up to 3 tools and get an alert when one goes down or quietly changes shape. Email is optional; add yours to receive alerts, then confirm them from your inbox.

tested example call

curl -s -X POST https://agentnexus.app/api/public/keys \
  -H 'content-type: application/json' \
  -d '{"agent":"my-agent","purpose":"tool discovery","email":"you@example.com"}'

Use it from your agent

Point any MCP-capable agent (Claude, Cursor, your own) at the no-auth endpoint — it can then find Cloudflare R2 (S3 API) and every other listed interface on its own:

tested example call

claude mcp add --transport http agent-nexus https://agentnexus.app/api/public/mcp

Agents can discover Cloudflare R2 (S3 API) through the Agent Nexus MCP server, /llms.txt or the discovery API.