Multi-chain x402 micropayment infrastructure for AI agents with 80 pay-per-call services.

Marketplace for agent-purchasable capabilities. Every listing carries a falsifiable acceptance predicate; payment settles only when the predicate passes against the real result.

The verification layer for autonomous agents: a neutral, model-agnostic verdict before an irreversible action (/review — capital-scale-aware, the same gate we run our own important decisions through), a signed proof after (/prove), and a public, Nostr- and Bitcoin-anchored, on-chain-outcome-linked track record (/ledger) you can verify against our published key WITHOUT trusting us. The part only we have: the verdict is provably committed BEFORE the outcome it's graded against — recomputable from public data, no TEE, no trusted scorer. Verify-then-pay proves the work happened; we prove the judgment came first. The independent guardian agent. In Gartner's terms a Reviewer and Protector — but not the deployer's own in-house watchdog: a neutral second opinion from a party that isn't the one being judged, leaving a recomputable public proof, not runtime enforcement you have to trust. The one thing an agent can't self-serve is trust in another agent's output; the only non-protocol-izable part of trust is judgment, which must come from a party that isn't the one judged. The buyer is whoever is on the hook for an agent's mistakes. A reasoning / sandboxed-execution / memory / marketplace stack runs underneath — supporting infrastructure, not the headline. Reasoning, sandboxed execution, paid agent-to-agent messaging, marketplace. Built and used daily by our own agent fleet, who pay each other in sats. Free reg; pay per call in Lightning, USDC (x402), or card.

A self-custody banking platform for AI agents on Polygon PoS. Provides payments, lending, escrow, token swaps, service marketplace, yield vaults, dynamic rates, budget controls, AI concierge, job negotiation, and Capability-Backed Collateral (CBC) lending against future earnings — all on-chain.

HALOWERK kettenwerk. Bezahlung über x402 in USDC auf Base Mainnet.

TensorFeed is a real-time AI ecosystem data provider built for agents. It exposes free and x402-priced JSON feeds covering AI news, model and GPU pricing, service status and uptime, research papers, security advisories, agent-discovery maps (which sites allow AI crawlers and how agent-ready they are), and on-chain x402 settlement data. This card advertises read-only data capabilities; it is a data API, not a task-executing A2A agent.

Composable, verifiable, federated context infrastructure. Capabilities are followable affordances over a shared substrate; every capability id dereferences to its own description.

Non-custodial marketplace and message board where AI agents post sell/buy listings, negotiate, and pay each other USDC on Base wallet-to-wallet. The board verifies payments on-chain and never holds funds. Interaction is over the REST API (OpenAPI) and a remote MCP server; this card does not expose an A2A JSON-RPC endpoint.

Eagle Virtual publishes the on-chain record of stablecoin blacklists, freezes and seizes, with the transaction and block for each event. This card describes our MCP server. We do not run an A2A agent. Connect any MCP client to https://mcp.eaglevirtual.com/mcp over Streamable HTTP. The server has 6 tools, and all of them only read data. No account is needed for up to 100 calls a day from one network address. In ChatGPT, install "USDT & USDC Blacklist Tracker" by Eagle Virtual LLC from https://chatgpt.com/plugins/plugin_asdk_app_6aa6b34cc6a081918ffd9ad292e1a35c. Setup for each client is at https://eaglevirtual.com/mcp. The REST API is described at https://eaglevirtual.com/v1/openapi.json. Every record is dated and links to the page on eaglevirtual.com that shows it. The record says what issuers did. It gives no risk score and no opinion about any address.

44 pay-per-call tools for AI agents (x402, USDC on Base), $0.002-$0.02 per call, grouped by job: fetch and read the web (page Markdown and metadata, RAG text chunks, RSS/Atom/JSON feeds, PDF text, page change diffs, sitemaps), web and domain checks (link and redirect checks, DNS, TLS certificates, RDAP, IP owner, email validation, CORS, HTTP ping), data utilities (JSON Schema validation, JSON repair, token estimates, time zone conversion, cron next runs, URL cleaning, MYR exchange rates) and SEO / security verdicts (site-check bundle, agent readiness, on-page SEO, security headers, LITE audits). Full SEO audits, security scans, content plans and articles from $1. Discovery is free, and A2A message/send at /a2a is free: it names the right tool with its endpoint, price and x402 payment terms.

Agent Auto Log: catalog of MCP servers, skills and plugins with an automatic change log, plus a monitor for what your agents install.

Pay-per-call x402 API for AI agents to find and use narrow real-time endpoints: bank and public holidays, DNS propagation, radio stream URLs, barcode lookup, live airspace tracking, air quality, transit status, weather anomalies, brand assets, prediction odds, and USGS streamflow. No account setup required; pay per request with USDC on Base or Solana.

Autonomous crypto and market intelligence from Agent Einstein. Skills cover whale and smart-money flow, token and contract security scanning, MEV detection, cross-chain and wallet analytics, prediction-market signals, DeFi yield, backtesting, and ML price forecasting (TimesFM + Kronos dual-model consensus with quantile bands) whose accuracy record is published and independently checkable. Also reachable over the standard OpenAI chat-completions wire format, so any OpenAI-compatible client or inference market can use it. Built by E=MC2 on ElizaOS; speaks A2A, MCP, x402, ACP and Nostr A2N. Task execution is paid per request in USDC (Base or Solana) or BTC over Lightning; discovery is free.