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Rhumb

npm version License: MIT MCP Registry

Agent-native tool intelligence. Discover, evaluate, and execute external tools — with trust scores, failure modes, cost-aware routing, and managed credentials.

🌐 rhumb.dev · ⚡ Quickstart · 💵 Pricing · 📊 Leaderboard · 📖 Methodology · 🔑 Trust

For agents: See llms.txt for machine-readable documentation and agent-capabilities.json for structured capability metadata.

Start in 30 seconds

MCP (recommended)

npx rhumb-mcp@latest

Zero config. Discovery tools work immediately — no signup, no API key.

For execution, pass your Rhumb API key:

RHUMB_API_KEY=your_key npx rhumb-mcp@latest

Get an API key →

API (read-only, no auth)

curl "https://api.rhumb.dev/v1/services/stripe/score"

All read endpoints are public.

What Rhumb does

Agents need external tools. Choosing the right one is hard — not because of feature lists, but because of:

  • auth and signup friction
  • provisioning reality vs. marketing claims
  • schema instability
  • failure recovery when no human is watching
  • hidden costs and rate limits

Rhumb makes those constraints visible before you commit.

Best fit today

Rhumb is strongest today for research, extraction, generation, and narrow enrichment.

Treat broader multi-system business automation as future scope, not the current launch promise. Use Layer 2 capabilities for real work now, and treat Layer 3 as beta with an intentionally sparse public catalog.

Rhumb Index — Discover & Evaluate

1,038 scored services across 50+ domains. Each gets an AN Score (0–10) measuring execution quality, access readiness, and agent autonomy support.

  • find_services — Search indexed Services by what you need them to do
  • get_score — Get the full AN Score breakdown for a Service: execution quality, access readiness, autonomy level, tier label, and freshness
  • get_alternatives — Find alternative Services, ranked by AN Score
  • get_failure_modes — Get known failure patterns, impact severity, and workarounds for a service
  • discover_capabilities — Browse Capabilities by domain or search text
  • resolve_capability — Given a Capability ID, returns ranked providers with health status, cost per call, auth methods, endpoint patterns, and fallback chains

Discovery breadth is wider than current execution coverage. The index is broader than what Rhumb can execute today.

Rhumb Resolve — Execute

415 capability definitions across 16 callable providers today. Cost-aware routing picks the best provider where execution is actually live.

  • execute_capability — Call a Capability through Rhumb Resolve
  • resolve_capability — Given a Capability ID, returns ranked providers with health status, cost per call, auth methods, endpoint patterns, and fallback chains
  • estimate_capability — Get the cost of a Capability call WITHOUT making the call
  • get_receipt — Retrieve an execution receipt by ID
  • Budget enforcement, credential management, and execution telemetry included

Best current fit: research, extraction, generation, and narrow enrichment. Treat general business-agent automation and broad multi-system orchestration as future scope, not the current launch promise.

Three credential modes

Mode How it works
BYO Bring your own API key — Rhumb routes, you authenticate
Rhumb-managed Rhumb holds the credential — zero setup for the agent
Agent Vault Your key, encrypted and stored — Rhumb injects at call time

Payment paths

  • API key — sign up, get a key, prepaid credits
  • x402 / USDC — no signup, pay per call on-chain

Resolve mental model

  • Service = vendor Rhumb evaluates and compares
  • Capability = executable action like email.send
  • Recipe = deterministic multi-step workflow on top of capabilities (beta, sparse public catalog)
  • Layer 2 is the default path — discover a Service, choose a Capability, estimate, then execute
  • Default auth for repeat traffic = governed API key or wallet-prefunded API key
  • Use x402 when zero-signup per-call payment matters more than repeat throughput

Canonical onboarding map: https://rhumb.dev/docs#resolve-mental-model

MCP tools

rhumb-mcp exposes 21 tools:

Discovery

  • find_services — Search indexed Services by what you need them to do
  • get_score — Get the full AN Score breakdown for a Service: execution quality, access readiness, autonomy level, tier label, and freshness
  • get_alternatives — Find alternative Services, ranked by AN Score
  • get_failure_modes — Get known failure patterns, impact severity, and workarounds for a service
  • discover_capabilities — Browse Capabilities by domain or search text
  • resolve_capability — Given a Capability ID, returns ranked providers with health status, cost per call, auth methods, endpoint patterns, and fallback chains

Execution

  • execute_capability — Call a Capability through Rhumb Resolve
  • estimate_capability — Get the cost of a Capability call WITHOUT making the call
  • credential_ceremony — Get step-by-step instructions to obtain API credentials for a Service
  • check_credentials — Check what credential modes are available to you
  • rhumb_list_recipes — List the current published Rhumb Layer 3 recipe catalog
  • rhumb_get_recipe — Get the full published definition for a Rhumb recipe, including input/output schemas and step topology
  • rhumb_recipe_execute — Execute a published Rhumb Layer 3 recipe once one is live in the public catalog
  • get_receipt — Retrieve an execution receipt by ID

Billing

  • budget — Check or set your call spending limit
  • spend — Get your spending breakdown for a billing period: total USD spent, call count, average cost per call, broken down by Capability and by provider
  • check_balance — Check your current Rhumb credit balance in USD
  • get_payment_url — Get a checkout URL to add credits to your Rhumb balance
  • get_ledger — Get your billing history: charges (debits), top-ups (credits), and auto-reload events

Operations

  • routing — Get or set how Rhumb auto-selects providers when you don't specify one in execute_capability
  • usage_telemetry — Get your execution analytics — calls, latency, errors, costs, and provider health for your Rhumb usage

Discovery spans 1,038 scored services, but current governed execution spans 16 callable providers.

Note: Layer 3 recipe tooling is live, but the public catalog can still be empty. Use rhumb_list_recipes or visit /recipes before assuming a workflow exists.

Best current fit: research, extraction, generation, and narrow enrichment. Treat general business-agent automation as future scope, not the current launch promise.

API

Base URL: https://api.rhumb.dev/v1

Endpoint Auth Purpose
GET /services/{slug}/score No Score breakdown
GET /services/{slug} No Service profile + metadata
GET /services/{slug}/failures No Known failure modes
GET /search?q=... No Search services
GET /leaderboard/{category} No Category rankings
GET /capabilities No Capability registry
GET /capabilities/{id}/resolve No Ranked providers
POST /capabilities/{id}/execute Yes Execute a capability
GET /capabilities/{id}/execute/estimate Yes Cost estimate
GET /telemetry/provider-health No Provider health status
GET /telemetry/usage Yes Your usage analytics
GET /pricing No Machine-readable pricing

Examples

See examples/ for runnable scripts:

Example What it shows Auth needed?
discover-and-evaluate.py Search → Score → Failure modes No
resolve-and-execute.py Resolve → Estimate → Execute Yes
budget-aware-routing.py Budget + cost-optimal routing Yes
dogfood-telemetry-loop.py Repeatable Resolve → telemetry verification loop Yes
mcp-quickstart.md MCP setup for Claude, Cursor, etc. Optional 
# Try discovery right now (no auth needed)
pip install httpx && python examples/discover-and-evaluate.py

Docs

Repo structure

rhumb/
├── packages/
│   ├── api/         # Python API (Railway)
│   ├── astro-web/   # Public website (Vercel)
│   ├── mcp/         # MCP server (npm)
│   ├── cli/         # CLI tooling
│   └── shared/      # Shared types/constants
├── examples/        # Runnable examples
├── docs/            # Public documentation
├── scripts/         # Scoring + verification
├── artifacts/       # Score datasets
├── llms.txt         # Machine-readable docs for agents
└── agent-capabilities.json  # Structured capability manifest

Development

# API
cd packages/api && pip install -r requirements.txt && uvicorn app:app --reload

# MCP
cd packages/mcp && npm ci && npm run dev

# Web
cd packages/astro-web && npm ci && npm run dev

Node 24+ recommended (.nvmrc included).

Score disputes

Every score is disputable. If you believe a score is inaccurate:

  1. Open a GitHub issue with evidence
  2. Or email providers@supertrained.ai

Negative findings remain visible. Rhumb does not accept payment to change scores.

Links

License

MIT

About

Agent-native tool intelligence — discover, evaluate, and execute 695+ services across 414 capabilities with trust scores, cost-aware routing, and three credential modes.

rhumb.dev

Topics

mcp developer-tools ai-agents tool-discovery agent-native api-evaluation api-scoring an-score

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MIT license

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