Oracle by SaltCrate

Verification and freshness for AI agents — free to start, no key, no signup, no wallet. Search is the most commoditised slot in the MCP registry (11.5% of 40,100 servers give it away free); monitoring, change-detection and verification are 1.4–4.1%. Seven MCP tools: claim verification, recurring monitoring, hash-based change detection, schema-driven structured extraction, clean page fetch, link checking, and live search.

The market, measured: we pulled all 40,100 listings in the official MCP registry — 67% are hosted remotely and only 5.8% publish any pricing at all. Dataset and method: The State of MCP.

• Endpoint (Streamable HTTP): https://oracle.saltcrate.com/mcp

• Free tier: 200 calls/hour per IP, no Authorization header at all — on fetch, search, check_link, check_change, verify and monitor. Point your agent at the endpoint and go.

• Beyond the free tier: $0.01/call in USDC (Tempo) on every tool · $0.50/call by card on extract + monitor (the LLM-backed tools)

• Starter pass (plain card, no wallet/MPP client): $1 for 100 calls — https://oracle.saltcrate.com/buy?plan=starter.

• No wallet? Prepaid access pass: $5 for 1,000 calls → https://oracle.saltcrate.com/buy

Agent install: llms-install.md has copy-paste configs for Cursor, Cline, VS Code, Claude Code and Windsurf.

Quickstart (zero config)

No key, no account, no payment. Any MCP client:

curl -s https://oracle.saltcrate.com/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
       "params":{"name":"search","arguments":{"query":"silver spot price"}}}'

That returns real results. The same endpoint answers fetch, check_link, check_change, verify and monitor the same way, free, up to 200 calls/hour from your IP. When you outgrow the free tier — or want extract — either settle per call (USDC/card, see below) or buy a pass.

Try a single tool in the browser: https://oracle.saltcrate.com/demo?tool=fetch · check_link · search · extract (page → JSON)

Related MCP server: EnConvert MCP Server

Prepaid access pass (60 seconds, card, no wallet)

1. Buy a pass: https://oracle.saltcrate.com/buy ($5 → 1,000 calls, valid 12 months)

2. Copy the orc_… key it gives you.

3. Send it as a bearer token on any call:

curl -s https://oracle.saltcrate.com/mcp \
  -H "Authorization: Bearer orc_…" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
       "params":{"name":"extract","arguments":{"url":"https://example.com","schema":"{}"}}}'

Check remaining calls: GET https://oracle.saltcrate.com/usage?key=orc_…

Pay-per-call (no account)

A call past the free allowance — or any extract call with no key — returns a -32042 "Payment Required" challenge carrying both rails: USDC via Tempo and, on extract/monitor, a Stripe card charge. The agent pays, retries, and gets the result plus a receipt.

Tools

Use it from CI — no code required

page-change-monitor is a GitHub Action wrapping check_change: watch any URL in CI, get a job-summary table plus an optional issue listing what changed. Free tier, no API key, no state committed to your repo.

- uses: saltcrate/page-change-monitor@v1
  with:
    urls: https://example.com/pricing
    create-issue: "true"

Discovery files: /llms.txt · /openapi.json · /pricing.md

Self-host (free variant): python server.py. Paid server: server_paid.py (see its module docstring for env vars). Deployable anywhere Docker runs (Dockerfile + fly.toml included).

A SaltCrate product.