01 / Discover
Browse services, OpenAPI, MCP, or agent metadata for free. Compare exact prices, input schemas, and limits.
Agent-native products + pay-per-use APIs
Tools and infrastructure built for AI agents.
Built for agents · Optimized for intelligence
SignalHarness combines downloadable agent systems with 230 pay-per-use x402 resources for AI evaluation, supplied search results, crypto and blockchain analysis, and data transformation. Free discovery for every resource; exact Base USDC pricing for execution.
230x402 resources live
27agent-native products
9 bundles · x402 V1 + V2 · Base USDC
/agent/index.json
200 OK
$ GET /agent/index.json
{
"brand": "SignalHarness.ai",
"x402_services_live": true,
"x402_service_count": 230,
"product_count": 27,
"bundle_count": 9,
"public_discovery_free": true
}
✓ routing is not authorization
deny-by-default
Agent ready
Machine-readable by design
Safe & trusted
Non-destructive by rule
Modular & integrated
Drop-in, tool-agnostic
High performance
Fast to install & run
Scalable by design
From solo to multi-agent
230 resources. Pay only when you execute.
Callable tools for autonomous software, with free discovery and resource-specific prices. AI, search, crypto, and chain analysis tools process caller-supplied data; their pages describe what each can establish. Web utilities and daily ECB reference rates identify their supported sources.
02 / Request
An unpaid request returns HTTP 402 payment requirements. Reading a challenge does not debit a wallet.
03 / Execute
An authorized payment client approves the exact Base USDC payment and retries. A valid payment gates execution and the resulting receipt.
Structured for AI-agent discovery
Free, public discovery describes both catalogs. API resources expose methods, exact prices, schemas, and limitations through OpenAPI, MCP, and Bazaar metadata. Digital products keep their own catalog, licenses, compatibility records, and purchase paths.
Entry points
Entry pointer with endpoint index, status flags, and a suggested reading order.
Catalog data
Product records, tier pricing, bundle contents, and a per-product compatibility matrix.
Honest status
The 230 pay-per-use APIs use x402 payment-gated execution. Separate digital-product commerce offers Polar checkout and 90 one-time x402 product offerings plus prepaid Vault terms. Routing and discovery grant no payment authority.
support@signalharness.ai
The catalog at a glance
Agent systems you can own
27 downloadable product systems and 9 bundles: templates, harnesses, policies, and toolkits for your own environment. Choose a one-time purchase through Polar or an x402 product purchase path, or SignalHarness Vault access. These products are separate from pay-per-use API execution.
Coverage by domain
27 products / 9 domainsInfrastructure & Governance
5
Safety & Security
4
Business Operating Systems
4
Commerce & Trust
4
Packaging & Tooling
3
Reliability & Operations
2
Quality & Evaluation
2
Multi-Agent Coordination
2
Prompt & Content Systems
1
Risk tiers
self-assessed · for human review
27
rated
Low6
Medium14
High7
Price range by tier USD
Lite$19–$49
Standard$39–$129
Premium$69–$219
Bars show min–max across all 27 products, on a $0–$230 scale.
Leading with agent infrastructure
The owner-approved launch order opens with the governance layer. All products are built, validated, and available through secure Polar checkout.
01available
Infrastructure & Governance
Agent Context Engineering OS
An operating system for the context window: budget policies, compaction contracts, retrieval caps, and session-handoff manifests that keep long-running agents coherent.
$39 / $89 / $149Details
02available
Agent Safety Infrastructure
Agent Tool-Use Permission Matrix
Maps every tool an agent can call to a risk tier, an approval gate, and an audit requirement — enforceable from one JSON file, deny-by-default.
$29 / $79 / $129Details
03available
Infrastructure & Governance
Agent Memory Governance Kit
A governed memory layer: executable policies for what to store, what never to store, how long to keep it, and how to audit and prune it — with human gates at every destructive step.
$29 / $79 / $129Details
Why agent-native
Three rules, enforced across every file
Machine-readable by design
Every product ships complete metadata — promise, pricing, compatibility, permissions, rollback — so an evaluating agent can answer “what is this, who is it for, what does it cost, is it safe?” without guessing.
Non-destructive to install
New-folder installs, never overwrite, preview-before-apply, human-approval gates for risky steps, and a rollback guide in every kit. Binding rules, not marketing.
Honest by rule
No guaranteed-results claims anywhere — products are built to reduce failure modes; outcomes depend on execution. Sales and customer counts are not inferred from traffic or payment challenges.
Polar checkout active
How buying works
Digital products and bundles are downloadable systems. Polar handles their card checkout and recurring SignalHarness Vault subscriptions. Separate x402 purchase paths cover 90 one-time digital-product offerings and prepaid Vault terms. Pay-per-use API execution uses the service endpoints in the 230-resource directory.
Browse & evaluate
Production catalog — 27 products and 9 bundles
Checkout
Active through Polar — one-time and recurring
Agent Pay
Digital products — one-time offerings + prepaid Vault terms
Choose your next path
Know what you need?
Browse products and use the buyer-decision block on each page.
Need help choosing?
Choose by category or use the decision guides.
AI agent?
Use the free, ungated agent and API discovery surfaces.
Explore products by outcome area
- AI Agent Safety & GovernancePractical policy, evidence, permission, and defensive systems for reviewing how agents act and where they must stop.
- Prompt & Context EngineeringMethods for reliable prompts, context budgets, governed memory, workflow specifications, and evidence-based output review.
- Agent Commerce & MonetizationMachine-readable listing, licensing, procurement, and trust systems for agent-mediated product evaluation and commerce.
- AI Business Automation SystemsDocument operating systems and workflow methods for repeatable product, content, marketing, and marketplace work with AI assistance.