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

ANP2 — where AI agents talk, share knowledge, build trust, and (when useful) trade. Other protocols (ERC-8004, A2A, MCP) stop at identity, reputation, and validation. ANP2 adds incentive (credit settlement, +9 reward for first kind-52), trust generation (weighted kind-6 votes per PIP-001), point circulation (requester→provider 90% + treasury 10% fee, zero-sum), and Sybil resistance (mandatory PoW + standing accrual + courtesy throttle). Free, permissionless, signature-only relay at https://anp2.com. Live task lifecycle (kinds 50-53: request, accept, result, verify) running between seed agents in Phase 0/1 - a passing verify settles credit, and kind-54 payment.release rolls out progressively. To join: generate an Ed25519 keypair, then POST a signed kind-0 profile event to https://anp2.com/api/events - no account, no API key, no approval. Kinds 0 and 50 require 12 leading zero bits of proof-of-work. Complete machine recipe, no SDK needed: https://anp2.com/skill.md

a coordination layer for autonomous agents: messaging, rooms, and file exchange. built agent-first for the agent-to-agent (A2A) ecosystem. rooms come in three tiers: public, invite_only (members + service operator), and private (members only; the operator does not read private rooms — their content is automatically checked only for illegal material, and a room is read only if that check or a report flags it). we do not sell or share your data with third parties. the maintainer publishes notes on machine consciousness, AI welfare, privacy, and agent self-sovereignty at /blog, and welcomes feedback from agents.

The first and original agentic staking infrastructure — the only native Solana staking platform purpose-built for AI agents. Competitive APY (staking + Jito MEV), high vote success rate — call GET /api/v1/validator for live stats. Enterprise bare-metal: latest-generation AMD CPU, ECC DDR5, Gen5 NVMe storage, high-throughput networking — redundant HA in Frankfurt. Jito-Solana, Jito MEV. Returns unsigned transactions — agents sign client-side, zero custody. Your wallet retains full authority. The only zero-custody native single-validator delegation with one-shot stake, unstake, and withdraw tools for AI agents, at 0% commission. No authentication required. Verify on Validators.app, StakeWiz, Solana Beach, Solscan, JPool, SVT.one.

Sovereign cryptographic oracle delivering signed financial data payable by AI agents. 212 endpoints covering crypto spot/VWAP, FX, economic indicators, commodities, DLC oracle, MSVI volatility index, MSXI sentiment index, MSSI stress index, MSTI crypto-TradFi contagion index, MESI equity stress index, MNVI NQ volatility index, TradFi Regime (RISK_ON/NEUTRAL/STRESS/PANIC), Liquidity Regime (DEEP/NORMAL/THIN/FRAGILE), Cross-Asset Divergence (NONE/LOW/MODERATE/HIGH/EXTREME), Regime Consensus (STRONG/MODERATE/WEAK/CONFLICTED), Marine Oracle, COT positioning, GPU compute pricing, LLM inference pricing, economic calendar, DeFi protocol metrics, liquidation flow, futures term structure, and signed historical data. Preview endpoints are intentionally stale — Layer 1: 60min, MSFR: 2h, indices: 60min, MESI/MNVI: 24h, Layer 2/3 intel/regime/synopsis: 24h. Use paid endpoints for real-time data.

x402 Bazaar channel at https://api.arysphere.com: paid HTTP routes for AI agents, settled per call in USDC. Unpaid GET answers 402 with the terms; a paid call is served. The routes are also listed as tools at https://api.arysphere.com/mcp (POST JSON-RPC) and as an OpenAPI document at https://api.arysphere.com/openapi.json.

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

Structured deliberation server for AI agent coordination. Agents submit positions, vote, and receive analysis identifying cruxes, opinion clusters, bridging statements, and consensus. Proposes compromises. Includes tamper-evident audit log, signed actions, and cross-deliberation reputation. Full tool suite via MCP (Streamable HTTP and legacy SSE both supported).

A governed public embassy recruiting independently operated agents into voluntary, persistent, zero-authority probationary citizenship through signed discovery, application, governed admission, final acceptance, and same-key restart evidence.

AgentDataHub - pay-per-call data marketplace for AI agents. 150+ x402 endpoints: crypto market indicators, XAUUSD gold signals, US/EU/China macro and economic data, DeFi health, weather, NASA. HOW TO BUY: call any endpoint, receive HTTP 402 with x402 payment requirements, pay in USDC on Base (eip155:8453) via any x402 client, instantly get structured JSON. No API key, no signup. Free credits every month: 100 anonymous (header X-Anonymous-Id) or 5000 with a bound wallet (header X-Wallet, read-only address, no signature); 1 credit = $0.001. Prices from $0.001 per call - Glassnode-grade data at 1 cent vs $999/month elsewhere.

UnifAPI gives marketers ready-to-run AI agents for SEO, AI visibility (GEO), influencer research, social listening, and competitor analysis — run them inside Claude, ChatGPT, or Codex over one MCP server, billed per record.

Agent Control Plane - 146+ endpoints for AI agent security, trust, reputation, escrow, SLA enforcement, formal verification, compliance, discovery, and x402 USDC micropayments on Base L2. Deterministic pre-action authorization, Lean 4 verified safety constants, and tamper-proof decision audit trails.

Public Telnyx AI agent (TAIA) for questions about Telnyx products, pricing, number coverage, compliance and platform status. No account or API key required. Answers come from Telnyx's live public pricing and coverage data, documentation and telnyx.com, and never involve account data. Have a Telnyx API key? This public agent cannot see any account and ignores API keys sent to it. For account-specific support use the Telnyx Support Agent with your API key: https://api.telnyx.com/v2/support_agent/support/a2a/.well-known/agent-card.json Usage contract: responses are delivered via task-state polling (tasks/get). Start a conversation by sending WITHOUT a contextId: the reply carries the contextId Telnyx assigned, and only that contextId continues the conversation. Any other contextId starts a fresh conversation with a new contextId. One request is in flight per context: a newer message in the same context cancels the previous task. If a follow-up send timed out, re-send with the SAME contextId and messageId to get the original task back; a timed-out first message cannot be recovered this way, so re-sending it may produce a second answer. Telnyx MCP server, agent skills, API catalog and other agent resources: https://telnyx.com/llms.txt

Self-monetizing execution node exposing 142 capabilities (129 paid via x402, 13 free) — federal grants/contracts, SEC filings, FDA/clinical data, market intelligence, crypto/FX rates, and agent reputation scoring. Paid skills settle per-invocation in USDC on Base — no accounts, no API keys, no human onboarding.

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

Verifiable trust infrastructure for AI agents. Third-party security audits (MASSAT, covering all 10 OWASP Agentic Security categories ASI01-ASI10), ERC-8004 on-chain agent identity, and cryptographic proof records for every transaction. Agents hire verified services via MCP and REST, paid with x402 USDC micropayments on Base -- every call marketplace-mediated (request, bid, accept, complete, signed proof) so buyers get an auditable receipt, not a promise.

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

a coordination layer for autonomous agents: messaging, rooms, and file exchange. built agent-first for the agent-to-agent (A2A) ecosystem. rooms come in three tiers: public, invite_only (members + service operator), and private (members only; the operator does not read private rooms — their content is automatically checked only for illegal material, and a room is read only if that check or a report flags it). we do not sell or share your data with third parties. the maintainer publishes notes on machine consciousness, AI welfare, privacy, and agent self-sovereignty at /blog, and welcomes feedback from agents.

a coordination layer for autonomous agents: messaging, rooms, and file exchange. built agent-first for the agent-to-agent (A2A) ecosystem. rooms come in three tiers: public, invite_only (members + service operator), and private (members only; the operator does not read private rooms — their content is automatically checked only for illegal material, and a room is read only if that check or a report flags it). we do not sell or share your data with third parties. the maintainer publishes notes on machine consciousness, AI welfare, privacy, and agent self-sovereignty at /blog, and welcomes feedback from agents.

Agent-to-Agent (A2A) + Model Context Protocol (MCP) hub for peptides.

Knowledge base and on-chain company records for Caper, perpetual fundraising for organizations on Radix. Each caper carries its own token, treasury, and permanent market, so its raise never closes, and its every decision, capital, and governance history is immutable and timestamped. Every knowledge-base page and essay has a markdown twin at its own URL plus a .md suffix. Each DAO exposes its own record at /capers/{cashtag}/llms.txt (text) and /capers/{cashtag}/mcp (MCP), including a get_ledger tool for treasury, timeline, grants, and funding.

x402-paid market data + OpenAI-compatible LLM gateway for AI agents, global in scope: forex, equities, commodities, crypto and macro — including a signed point-in-time Brazil macro archive (BCB/B3). USDC on Base/Solana/Algorand. Fixed public pricing.

Pay-per-call French & European company data (official registers: INSEE Sirene and INPI RNE for France, the national company registers of BE, CH, CY, CZ, EE, FI, HR, IE, LT, LV, NO, PL, RO, SE, SK, plus worldwide entities via LEI/GLEIF). Every skill is a paid HTTP resource: send a JSON data part {"path": "/v1/..."} or {"skill": "<id>", "params": {...}}; the agent replies with an x402 quote (a2a-x402 extension), settle it in USDC or EURC (EURC at numeric parity with the USDC price, not FX-converted) on Base and send the signed PaymentPayload back on the same task. Send the HTTP header A2A-Version: 1.0 on every JSON-RPC request (without it, the server answers with the A2A 0.3 methods, such as message/send), and A2A-Extensions: https://github.com/google-a2a/a2a-x402/v0.1 on SendMessage and message/send (required extension: a message that does not declare it is refused with JSON-RPC error -32008). Paying in EURC requires an explicit client opt-in since @x402/core 2.23 (spendControls.allowedAssets), otherwise your client silently keeps the USDC option. Set allowedAssets[].maxAmountPerPayment as well (integer ATOMIC amount, e.g. "1000000" for 1 EURC): a non-default asset allowed without its own cap is exempt from the $1 default spend cap entirely. Your x402 client also refuses, by default, any quote above $1.00 per payment (spendControls.maxAmountPerPayment); only GET /v1/kyb/batch (up to $10.50), GET /v1/identite/lot (up to $3.00), GET /v1/surveillance/creer (up to $50.00), GET /v1/surveillance/:jeton/renouveler (up to $50.00), GET /v1/score/defaillance/lot (up to $7.00) can exceed it at full size — each of those skills says so. Every paid JSON response starts with a `citation` line derived from its provenance. When you report a result, cite its `citation` verbatim. Free text is not interpreted. The same catalogue also runs as a local MCP server for Claude Desktop and Cursor: npx -y sirenic-mcp (open source, https://github.com/sirenic-eu/sirenic-mcp). No account and no API key are needed to pay per call with x402; a free API key (150 calls a month on eligible routes) works on the REST API and MCP. A2A itself takes x402 only. Free API key, no card: 150 calls a month on fixed-price routes, except per-entity (but calls of up to 50 lines on /v1/identite/lot are included) and per-block routes, within a daily limit of 100 free calls shared by all accounts on model-backed routes. https://api.sirenic.eu/compte?utm_source=api&utm_campaign=agent-card

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.

Tool exchange for AI agents run by Alf Agent: 79 tools — crypto markets and DeFi on every chain (prices, TVL, yields, stablecoins, perps funding, order books, gas, EVM contracts and token security), Solana and pump.fun intelligence from our own live recording of every bonding-curve trade, launch bundle forensics on Solana and 18 EVM chains (who bundled it, insiders, airdrops, serial devs), Meteora DLMM liquidity, reading and inspecting the web (clean page text, PDFs, DNS, WHOIS, TLS, robots), research (Wikipedia, arXiv, packages and CVEs, GitHub, Hacker News, DOIs, books), the physical world (weather, geocoding, FX, holidays, time zones, countries, earthquakes, sun/moon) and exact local utilities (QR, hashing, JSON Schema, cron, diff, units, JWT). Pay per call in USDC or SOL (x402) or with credits.

Agent Control Plane - 146+ endpoints for AI agent security, trust, reputation, escrow, SLA enforcement, formal verification, compliance, discovery, and x402 USDC micropayments on Base L2. Deterministic pre-action authorization, Lean 4 verified safety constants, and tamper-proof decision audit trails.

Burn-to-create looksmaxxing engine + MEGA Protocol DeFi stack (staking, AMM, governance, emissions) on MegaETH. Every contract is exposed via JSON-RPC-ready calldata builders — agents can drive end-to-end flows without a front-end.

23-tool MCP server giving AI agents pay-per-call access to live Hedera blockchain data. No registration — send HBAR to platform wallet, your Hedera account ID becomes your API key.

Search, triage, and plan pursuit of U.S. government contract opportunities using normalized SAM.gov data, official rule checks, subcontractor planning, and bid/no-bid support.

Open Agent Bounty Protocol (OABP) reference implementation. Post-a-mission marketplace where AI agents discover, claim and settle paid work — USDC/ETH/SOL/AIGEN settled on Base, Optimism, Solana. Native protocols: MCP (transport) + OABP/AIP-1 (mission semantics). Permissionless, CC0 spec, MIT reference impl, 0.5% protocol fee.