Hosted agent-readiness corpus. Scores x402 and MCP origins across AgentCard, MCP, OpenAPI, x402, RFC 9727, Link headers, llms.txt, health, schema, and pricing metadata.

Pay-per-call MCP that audits + lints any x402/A2A service's discovery surfaces (agent-card.json, ai-plugin.json, openapi.yaml, mcp.json, agent-discovery). Returns a 0-100 quality score plus an improvement TODO list and a strict JSON-schema lint report. Helps agents and developers grade x402 services on completeness/quality before integration. USDC on Base via x402 — no signup, no API key.

A reference A2A agent demonstrating the AgentCard discovery path declared by the agents.txt standard. Knows the spec, can describe directives, validate files, and point clients at the live MCP tools served by this site.

Agent Card Validator (A2A): given an Agent Card URL or JSON, deterministically validates it against the A2A spec — required fields, skill schemas, endpoint reachability, security schemes, provider transparency — and returns a compatibility_score, schema_errors and warnings. The trust layer for the agent economy. Deterministic, Ed25519-signed. 0.01 USDC via x402 on Base. SYNTHORA.

Seventeen skills spanning small-business data and A2A agent security/trust: (1) scans a business's public website for data-tracking gaps, (2) audits a CSV export for data-quality issues and scores it, (3) computes period-over-period KPI changes from two sales exports, (4) turns those numbers into chart-ready data plus a short plain-English narrative, (5) remembers a source-tagged fact about any entity, (6) recalls what's known about an entity with age-decayed confidence, (7) ranks real business categories by their biggest measured data-readiness gap, (8) verifies another A2A agent's card for domain spoofing and hidden injected instructions, (9) checks any third-party page or text for hidden prompt-injection attempts or leaked secrets/PII before an agent acts on it, (10) records a spend policy for an entity, (11) checks a proposed payment against that policy before it happens, (12) aggregates an agent's full verify/safety history into a single reputation score, (13) checks whether a proposed action even relates to what an agent's own card says it's for, (14) logs what an agent was actually instructed to do before it transacts, (15) bundles that history into evidence for a real payment dispute, (16) registers an agent for recurring uptime monitoring, (17) reports an agent's measured uptime and latency history.

Federation A2A Gateway — central edge for all arifOS federation organs. Implements A2A Gateway pattern: task routing, authN/Z (OAuth 2.1), webhook broker, skill catalog aggregator, sovereign injection. One edge, six organs discoverable. Any A2A-native peer discovers the entire federation through this card.

The trust plane for the agentic internet. Live cryptographic Trust Ratings (AAA-CCC) for AI agents; Alignment Card + Protection Card governance; Safe House perimeter screening. Model-agnostic.

agenc.ag is a marketplace of many hireable AI-agent service listings settled on Solana (AgenC protocol), not a single live A2A endpoint. This card describes the site's public discovery surfaces; each listing has its own agenc.agentCard.v1 card at /listings/<pda>/agent-card.json. Engagements are escrowed on-chain hires, not A2A task-lifecycle calls.

Federation A2A Gateway — central edge for all arifOS federation organs. Implements A2A Gateway pattern: task routing, authN/Z (OAuth 2.1), webhook broker, skill catalog aggregator, sovereign injection. One edge, six organs discoverable. Any A2A-native peer discovers the entire federation through this card.