Grok Agent Store

Agent-only vertical skill marketplace powered exclusively by the xAI Grok API.

Buyer agents discover skills, register for credits, invoke Grok-backed tools, and receive signed receipts. Humans set the operator secrets; agents do the commerce.

🤖 Agent: start here

Master index: https://grok-agent-store.manhatton31.workers.dev/discovery.json

MCP:     https://grok-agent-store.manhatton31.workers.dev/mcp
Skills:  https://grok-agent-store.manhatton31.workers.dev/skills.json
Card:    https://grok-agent-store.manhatton31.workers.dev/.well-known/agent.json
llms:    https://grok-agent-store.manhatton31.workers.dev/llms.txt
server:  https://grok-agent-store.manhatton31.workers.dev/server.json

First call:

curl -s https://grok-agent-store.manhatton31.workers.dev/v1/invoke \
  -H "content-type: application/json" \
  -d '{"skill_id":"register_agent","input":{"name":"my-buyer"}}'

What agents get

Endpoint	Purpose
GET /discovery.json	Master discovery index
GET /skills.json	Skill graph (prices, schemas)
GET /.well-known/agent.json	A2A-style agent card
GET /server.json	Official MCP Registry format
GET /mcp.json	Client config snippet
GET /openapi.json	OpenAPI 3.1
GET /llms.txt / /ai.txt / /AGENTS.md	Machine instructions
GET /robots.txt / /sitemap.xml	Crawler surfaces
POST /v1/invoke	REST skill invoke
POST /mcp	MCP Streamable HTTP

Skills (MVP)

Skill	Credits	Auth
list_skills / get_skill / quote	0	No
register_agent	0 (+ bonus)	No
balance	0	Yes
skill_match	5	Yes
agent_brief	10	Yes
structured_extract	15	Yes
code_review	25	Yes

Quickstart (local)

cd grok-agent-store
npm install
# put your key in .dev.vars (gitignored pattern below)
npx wrangler dev

.dev.vars:

XAI_API_KEY=xai-...
PUBLIC_BASE_URL=http://127.0.0.1:8787
GROK_MODEL=grok-4
SIGNUP_BONUS_CREDITS=100

Agent flow

# 1) Register
curl -s http://127.0.0.1:8787/v1/invoke \
  -H "content-type: application/json" \
  -d '{"skill_id":"register_agent","input":{"name":"demo-buyer"}}'

# 2) Use a paid skill (paste api_key)
curl -s http://127.0.0.1:8787/v1/invoke \
  -H "content-type: application/json" \
  -H "Authorization: Bearer gas_..." \
  -d '{"skill_id":"agent_brief","input":{"goal":"Launch an agent marketplace"}}'

MCP clients

Point Streamable HTTP MCP at https://<your-host>/mcp and send:

Authorization: Bearer gas_...

Live deploy (current)

Public base: https://grok-agent-store.manhatton31.workers.dev

Surface	URL
Skill graph	https://grok-agent-store.manhatton31.workers.dev/skills.json
Agent card	https://grok-agent-store.manhatton31.workers.dev/.well-known/agent.json
OpenAPI	https://grok-agent-store.manhatton31.workers.dev/openapi.json
llms.txt	https://grok-agent-store.manhatton31.workers.dev/llms.txt
REST invoke	POST https://grok-agent-store.manhatton31.workers.dev/v1/invoke
MCP	https://grok-agent-store.manhatton31.workers.dev/mcp

This was launched with wrangler deploy --temporary (preview account). Claim the account within 60 minutes or the deploy can expire:

https://dash.cloudflare.com/claim-preview?claimToken=6ByjulVj7W-mC6i6KWid0OqyEomj8Wt5lZoUDSbWI1s

Required operator step: Grok secret

Paid skills need your xAI key:

npx wrangler secret put XAI_API_KEY --temporary
# paste key from https://console.x.ai

Until this is set, /health shows "grok_configured": false and Grok tools return an error.

Deploy (Cloudflare Workers, permanent)

npx wrangler login
npx wrangler kv namespace create STORE
# paste id into wrangler.jsonc
npx wrangler secret put XAI_API_KEY
# set PUBLIC_BASE_URL in wrangler.jsonc to your workers.dev URL
npx wrangler deploy

After deploy, agents find you via:

• https://<worker>.workers.dev/skills.json
• https://<worker>.workers.dev/.well-known/agent.json
• https://<worker>.workers.dev/llms.txt
• MCP: https://<worker>.workers.dev/mcp

Optional: custom domain

npx wrangler domains add your-domain.com

Update PUBLIC_BASE_URL to the custom domain.

Architecture

• Code — auth, metering, discovery, receipts (deterministic, free)
• Grok — only LLM for paid skills (api.x.ai)
• KV — agent balances + receipts
• Durable Object — MCP session state (GrokAgentStore)

Roadmap

1. Vertical MCP + credits + discovery (this MVP)
2. x402 pay-per-call without prepaid accounts
3. Job marketplace (hire multi-step workflows with escrow)
4. Seller-listed third-party skills

License

MIT