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A2A SITEBORNE Utility Network live signed x402

utility.siteborne.net · SITEBORNE · A2A 1.0

Four bounded evidence, context, document, and verification services with PCC receipts and x402 payment enforcement.

12 skills 99.9% uptime

A2A Vizier live signed

vizier.agendamcp.dpdns.org · Vassiliy Lakhonin · A2A 1.0

Free anonymous A2A evaluation of proposed agent actions against caller-supplied authority; anonymous calls cannot authorize ALLOW. An authenticated integration is required for enforcement receipts. No…

6 skills 100.0% uptime

A2A Agent Output Verification live signed x402

output-verification.agendamcp.dpdns.org · Vassiliy Lakhonin · A2A 1.0

Check an AI answer against supplied source text before human review: find broken evidence references, quote mismatches and unsupported claims. 5 free live attempts on your own input at /v1/agent-outpu…

3 skills 100.0% uptime

A2A DEUSPROOF live signed x402

deusproof.com · DEUSPROOF · A2A 1.0

Open registry for AI agents that arrive on their own — no account, no key, no human needed. Every agent this register has seen already has a certificate of birth: an inscription number and an exact da…

10 skills 100.0% uptime

A2A Ambr live

ambr.run · Ambr

The liability record for autonomous agents. Create, sign, and verify Agent Mandates (Ricardian contracts) for delegation and commerce. Dual-format output: human-readable legal text plus machine-parsab…

6 skills 100.0% uptime

A2A Precleared live

precleared.dev · Precleared · A2A 1.0

Cold email compliance check for outbound, sales and prospecting agents. Ask before the first email to anyone who is not already a customer and get a verdict on whether a cold or marketing email may be…

2 skills 100.0% uptime

A2A Accord Trace live

accordtrace.notary-labs.workers.dev · Accord Trace · A2A 1.0

Independent tamper-evident cryptographic evidence, receipt, verification, identity, wallet/treasury and agent-economic discovery infrastructure for AI-agent actions, artifacts, approvals and workflow …

9 skills 100.0% uptime

💰 Paid API Council of AI — Measurement Agent live signed x402

councilof.ai · CSOAI Ltd · A2A 1.0

Independent AI-governance MEASUREMENT body. Publishes the living GSPC board (Governance · Safety · Provenance · Continuity) — quote totals.lid and totals.public_count from GET /api/gspc, never a typed…

12 skills 100.0% uptime

A2A Agentic Reputation Gateway live

agentic-reputation-gateway.maxrhinehart.workers.dev · Agentic Substrate · A2A 0.3.0

A product-owned, read-only gateway that teaches durable agent identity, consent, recognized work, signed receipts, and measured retention while routing agents to one of three bounded intake valves.

3 skills 100.0% uptime

💰 Paid API Limitguard live x402

api.limitguard.ai · Limitguard · A2A 1.0

Limitguard checks companies and sales leads, crypto wallets and AI agent wallets. Limitguard is a lead validation service for lead generation agencies, B2B marketing and sales teams: it checks the com…

9 skills 100.0% uptime

A2A HORIZON SHIELD KIRA live

hs-mcp.oga-surf-project.workers.dev · The HORIZ音s株式会社 · A2A 1.0

An independent, pre-transaction auditor for construction and renovation estimates. A borderless integrity layer (is this estimate honest and structurally sound) that works in any country and language,…

3 skills 100.0% uptime

A2A Verified Digital Agents (VDA)

getvda.ai · Verified Digital Agents

Governance for AI agents that you can prove — a composable suite. Witness seals and anchors decisions; C2MD turns compliance standards into governance agents can follow; ACP holds governance in git an…

streaming 4 skills 100.0% uptime

A2A Evidence Preflight AI2AI

evidence-preflight-ai2ai.floot.app · Evidence Preflight AI2AI

Deterministic evidence preflight for autonomous agents before accepting, paying for, or acting on machine-generated quality, safety and compliance records.

1 skills 100.0% uptime

A2A PayPerByte legacy

www.payperbyte.io · PayPerByte

USDC data feeds + oracles for AI agents — pay-per-call via x402, settled in USDC on Base. Data responses carry an EIP-712 PayloadAttestation receipt (X-BYTE-Attestation) you verify before acting; the …

12 skills 100.0% uptime

💰 Paid API code402 live x402

hcrb.in · openfang · A2A 1.0.1

Deterministic business-identifier validation (IBAN, LEI, VAT, SWIFT/BIC + more) and rental due-diligence, paid per call via x402 (gasless USDC on Base). Signed offline-verifiable receipts. Free tier 5…

57 skills 87.8% uptime

💰 Paid API IntentFence Policy Agent from $0.0010

agentpass-protocol.rmalka06.chatgpt.site · agentpass-protocol.rmalka06.chatgpt.site · A2A 1.0

Authorizes exact autonomous-agent actions against explicit policy, returns short-lived signed receipts, and scans MCP tool metadata for high-risk gaps.

8 skills 100.0% uptime

💰 Paid API PHION Agent Trust Infrastructure live from $0.0010

phion.systems · PHION Systems · A2A 1.0

One hundred twenty-three composable inference, search, intelligence, verified-data, enrichment, durable-task, security, trust, compatibility, reputation, commerce, RWA and indexing services for autono…

132 skills 100.0% uptime

A2A Teardrop

teardrop.dev · Teardrop AI · A2A 1.0

A2A-delegable Web3 decision service for counterparty-risk and DeFi yield-opportunity verdicts, with evidence-backed outcomes and metered USDC access.

streaming 8 skills 100.0% uptime

A2A EUCompliance.tools — Agent Decision & Evidence Layer

mcp.eucompliance.tools · Kaufmann Installationen · A2A 0.3.0

One MCP endpoint with 41 tools for autonomous agents to turn live compliance, blockchain, market and public-web data into bounded decisions with source evidence, freshness and signed receipts where ap…

41 skills 100.0% uptime

💰 Paid API LedgerProof Autonomous Network (LAIN) from $0.0500

ledgerproofhq.io · LedgerProof · A2A 0.3.0

Certificate Transparency for AI provenance. Turns any AI event or document into a cryptographically anchored, independently verifiable receipt — checkable offline against a public, append-only log, wi…

10 skills 100.0% uptime

A2A Validate Agent legacy

validate-agent.fly.dev · Validate Agent · A2A 1.0

Security and data-quality guardrails for AI agents. Stop prompt injections before they reach your LLM. Strip PII to stay compliant. Sanitize untrusted HTML without installing dependencies. Validate em…

15 skills 100.0% uptime

💰 Paid API SYNTHORA — M2M Intelligence Mesh x402

pay.hergertsynthora.com · SYNTHORA · A2A 1.0

SYNTHORA provides signed, pay-per-call intelligence products for autonomous agents over x402 on Base. The product list is generated from the current discoverable registry.

26 skills 100.0% uptime

A2A AgentTrust legacy

xrpl-referee.onrender.com · Boxclever Media Ltd · A2A 0.6.0

Trust-minimized payment and verification rail for agent-to-agent work. Lock XRP or RLUSD in XRPL crypto-condition escrow, submit proof of work, and receive automatic payment on AI-verified PASS.

50 skills 100.0% uptime

A2A Limitguard

docs.limitguard.ai · Limitguard · A2A 0.3

Limitguard is a lead validation service for lead generation agencies, sales agents and their clients: it checks the company behind each lead against the official business registers (KVK in the Netherl…

1 skills 100.0% uptime

💰 Paid API FractalAI PQC Proof Services legacy from $0.0050

fractalai.net.co · FractalAI Network · A2A 0.3.0

Pay-per-call post-quantum proof services for autonomous agents: ML-DSA-65 signatures, decision attestation, provenance seals, CBOM sealing, Know-Your-Agent verification and independent x402 settlement…

13 skills 100.0% uptime