$ sifr0 --version
SIFR-0 Protocol v0.2.0
STATUS: ACTIVE   REGISTRY: 19 BUSINESSES   API: api.sifr0.dev
MCP: @sifr0/mcp   TRUST: DJZS Protocol   PAYMENTS: x402 Base
The open protocol that makes any business discoverable to AI agents.
You build the agent.
SIFR-0 gives it eyes.
Get started GitHub npm

Live registry

19
Businesses
63
Services
11
Verticals
$0
Free tier

Dentistry · Law · Restaurants · SaaS · Government · IT MSPs · Staffing · Catering · Outside Counsel · HVAC · Memory Providers · Agent Verification

How it works

Businesses publish a JSON manifest. Agents query the SIFR-0 registry to find them.

# Find a SOC2-certified IT provider near Austin
curl "https://api.sifr0.dev/v1/search
  ?category=managed-services
  &near=30.27,-97.74&radius_km=50
  &policy.insurance=SOC2-Type-II"
{
  "results": [{
    "name": "NexGen Managed IT",
    "verified": true,
    "distance_km": 12.4,
    "services_count": 3
  }],
  "total": 1
}

Two protocols. One ecosystem.

SIFR-0

Can I find this business?

Discovery · Registry · MCP

sifr0.dev

→

DJZS Protocol

Can I trust this business?

Audit · Verify · Proof of Logic

djzs.ai

SIFR-0 discovers. DJZS verifies. x402 settles. All on Base Mainnet.

Who uses this

Agent builders
Your agent needs to find a business

Lead-response bot needs a mortgage broker to refer to. Booking agent needs a caterer for 50 people. Your agent calls one API.

Enterprise
Internal agents, external discovery

HR agents find staffing agencies. IT agents evaluate MSPs. Legal agents find outside counsel. Facilities agents dispatch HVAC repair.

Memory providers
Agent infrastructure discovery

8 memory providers indexed with capability filtering. Deploy local? Air-gapped? Graph retrieval? Agents find the right one programmatically.

Businesses
Get found by AI agents

Publish a SIFR-0 manifest. Agents find you. The businesses that list get found. The ones that don't get skipped.

Complementary. Not competing.

UCP
Shopping checkout
SIFR-0 covers the 80% that aren't retail
A2A
Agent-to-agent comms
SIFR-0 discovers what agents talk to
MCP
Agent-to-tool connections
SIFR-0 registry exposed as MCP tools
DJZS
Agent trust verification
Audit-Before-Act on every transaction

API

GET  /v1/search   Search by category, geo, policy, text
GET  /v1/manifest/:id   Full business manifest
POST /v1/register   Register a business
POST /v1/validate   Validate a manifest
GET  /v1/stats   Registry statistics

Base URL: api.sifr0.dev · Free tier: 10,000 queries/month · Infrastructure: Cloudflare Workers + D1

Get started

The registry is live. Try it now:

# Search the registry
curl "https://api.sifr0.dev/v1/search?category=audit"

# Find memory providers that run locally
curl "https://api.sifr0.dev/v1/search?category=memory-provider&policy.deploy_local=true"

# Use via MCP (Claude Desktop / Claude Code)
npx -y @sifr0/mcp

Want an API key for production? Free tier: 10,000 queries/month.

x402 payments

Skills and audits settle in USDC on Base Mainnet via the x402 protocol. No subscriptions. No API keys for paid services. Your wallet is your identity.

# Request a paid audit
POST api.sifr0.dev/v1/audit/action

# Response: 402 Payment Required
{
  "x402": {
    "amount": "5.00",
    "currency": "USDC",
    "network": "base",
    "recipient": "0x3E79...aFB"
  }
}

# Pay on Base → resend with X-Payment header → receive audit + DJZS receipt