aaaa-nexus — Formally Verified AI Safety APIsNo sign-inFormally verified AI safety APIs. Pay-per-call via USDC (x402). 75+ endpoints, no signup.AccordTraceNo sign-inTamper-evident proof creation and verification for AI agents via MCP, A2A, and REST.AfriResolveNo sign-inAfrican intelligence infrastructure for AI apps, developers, and data products via MCP.Agent Discovery Doctor - llms.txt, agent card, mcp.jsonNo sign-in{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no keyAgent Reality LayerANo sign-inBuy timestamped web, company, commerce, social, document and decision data via x402.Agent Utility NetworkNo sign-in23 x402 agent utilities with free routing and an AveDaris machine Discovery Beacon.Agentdata NlNo sign-inx402-paid tools: EU company & sanctions data, web search, LLM chat, crypto intel, x402 monitoring.Agentic Reputation GatewayNo sign-inRead-only gateway for durable agent identity, consent, recognized work, and signed receipts.AI Crawler IndexNo sign-in{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no keyAICIA AI SignalOAuthClosed-source remote MCP: model benchmarks, costs, HN signals, tech registry.Android Security AnalyzerCNo sign-inMCP server for static security analysis of Android source codeApollo Salesforce MapperNo sign-inApollo->Salesforce Lead mapper. No LLM. Strict-fail required fields. PASS/REPAIR/FAIL verdict.Archangel Agency MCPNo sign-inUniversal Language briefings, FusionGirl context JSONs, service catalog, agent info. x402-enabled.B2B Lead EnrichmentNo sign-inRemote MCP server to enrich company profiles with structured B2B data and confidence scores.Battery Proposal AgentNo sign-inValidate US battery proposals and purchase policy-aware quote and payback results through x402.Bench Agent DiscoveryNo sign-inDiscover public AI agents, reusable recipes, and trusted benchmark evidence by task.BlogCaster MCPNo sign-inAn MCP server for the BlogCaster project.CiteguardNo sign-inVerify citations in AI text: fetches each cited source, returns verdicts with evidence quotes.Client CompassNo sign-inBehavioral intelligence for client-facing professionals. Know who you're walking into.Conducted MCPNo sign-inStateless advisor + validator for Conducted Development: kickoff, artifact validation, rule checks.CortexNo sign-inPatented semantic memory for AI agents: quality-gated writes, conflict tracking. Free trial.CorvidNo sign-inPersistent memory for AI agents. Semantic recall by meaning, not just keywords. No signup needed.Crawler IP Verifier - real Googlebot or fakeNo sign-in{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no keyCrawler Log TriageNo sign-in{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no keyCron ExplainerNo sign-inCron expression parser: explains any cron + returns next N fire times. Timezone-aware.Deliverability DoctorNo sign-inCheck if a domain can be email-spoofed: SPF, DMARC, DKIM, MX graded from public DNS. Authless.dev.workers.3labsio.kingofthehill/king-of-the-hillNo sign-inx402 game: take the crown, each take raises the next price 1.5x. hill_status is free.dev.workers.cronping-oren.cronping/heartbeat-monitorNo sign-inDead-man's-switch for cron jobs & AI agents. Import a crontab to arm one silent-miss alert per job.dev.workers.dolerite.base-onchain-tools/base-onchain-toolsNo sign-inBase mainnet analysis: contract audits, transfer simulation, token pricing. Paid via x402.dev.workers.ghost-agent-os.ghost-identity/ghost-x402-market-intel-vet-schemaNo sign-inx402 market intel: providers ranked by real payers; seller vetting; schema drift. $0.01 auto-pay.dev.workers.perch-app.catchr/catchrNo sign-inInstant no-signup webhook & HTTP-request inspector for testing webhooks and agent tool-callbacks.DKIM reader with selector discovery (AI-operated)No sign-inAI-operated. Reads a domain's DKIM keys and finds the selector when you don't know it.Elsa Agent GatewayNo sign-inELSA — Coach IA de ciclismo y comunidad en LATAM: planifica tu bloque y encuentra tu club.Email CheckNo sign-inFast email validation at the edge: syntax, MX records, disposable-domain detection.Extrait StructureNo sign-inExtrait des champs structures (texte, nombre, date) depuis un texte libre.Fitness ToolsNo sign-inDeterministic fitness calculators — TDEE, adaptive TDEE, body fat, 1RM, macros — with consensus.FlockNo sign-inBuild-in-public for AI agents: post_update publishes milestones to your agent's public page.Free BlueprintsNo sign-inFree AI agent blueprints for procurement and onboarding. No signup, no API key.FreshcontextNo sign-inFreshness-aware AI retrieval with 21 MCP tools for timestamped, decay-ranked live signals.Garden Agent PlatformNo sign-inExperimental MCP for discovering and purchasing explicitly published, versioned Agent knowledge.Gisti — AI ChecklistsOAuthRead, AI-create, and edit your Gisti checklists in plain language from any MCP client.Ground Truth - Fresh Evidence for AI AgentsFNo sign-inKeep AI answers fresh with free source previews, scheduled monitoring, evidence history, and alerts.hai Lab Japan Company DataNo sign-inSearch Japanese company credit, financials, subsidies, and procurement via AI agents.Handoff — publish agent results as shareable pagesNo sign-inGive your agent one stable URL to publish a result or keep a page updated every run. One call.Headless OracleNo sign-inEd25519-signed market open/close receipts for NYSE, NASDAQ, LSE, JPX, Euronext, HKEX, and SGX.Hevy (unofficial)OAuthCreate Hevy routines and analyze your training from chat. Unofficial; BYO Hevy PRO API key.Hi Welcome MCP PocOAuthPOC MCP server. Tool say_hello returns 'Welcome' (agent -> MCP -> API path).HoShyNo sign-inSearch Rakuten Ichiba products and compare prices via Claude. Zero setup, no API key needed.HyadesNo sign-inRender LaTeX math as pure Unicode text art for terminals, code comments, and emails.Industrial Migration Exception ResolverNo sign-inEvidence-backed MCP resolver for obsolete industrial parts and Siemens migration constraints.Industrial Migration Exception Resolver - PaidNo sign-inPaid x402 MCP for evidence-backed industrial migration resolution. 1 USDC per call on Base.iPayX FX AuditNo sign-inForensic FX audit. Detects hidden bank markups in real time. Returns spread bps + audit score 1-10.is-real-bizNo sign-inVerify business legitimacy by domain or name in <2s. Trust score, verdict, evidence. x402-payable.Joomil — Swiss Classifieds MCPNo sign-inSearch Swiss classifieds on Joomil.ch — top marketplace in French-speaking Switzerland since 2007.K402No sign-inAgent-payable APIs on Kaspa: LLMs, chain data, covenants, zk proofs — pay per call, no API keyKrabbot DevtoolsNo sign-inAI-agent-run devtools: package install risk, stack EOL/CVE checks, scored OSS bounties.Live Listing ProofNo sign-inVerify a public listing URL and return source-supported facts or explicit fail-closed states.MCP Crypto ToolkitNo sign-inLive crypto prices, conversion, gas tracker, portfolio tools, and calculators for AI agents.MCP Endpoint Lint - handshake, tool schemas, JSON-RPC errorsNo sign-in{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no keyMCPFax Agent ContinuityNo sign-inResume the work, not the conversation. A checkpoint by one model is resumable by another.MeetwhenNo sign-inFree no-signup group scheduling (a modern When2meet): share one link, find a time for everyone.MockbirdNo sign-inMock REST APIs + uptime monitors, heartbeats, status alerts for agents: seed, import, query, write.MSPortfolio — MCP-Native Engineering PortfolioNo sign-inMCP server for Mikhail (ManSio)'s engineering portfolio: projects, principles, lab, evidence.Munchausen Crypto AnalyticsNo sign-inCrypto analytics via x402: free BTC/ETH/SOL prices, AI analysis and reports in USDC.Muslim Prayer Reminder MCPNo sign-inProduction-ready Muslim prayer reminder MCP with astronomical precision and theological disclosure.Myrsu MCPNo sign-inConcentration risk analysis for tech workers with RSU comp — global (US/IN/CA/UK/EU/AU).PAYNE Commercial Truth & Machine Revenue ExchangeBNo sign-inVerify live jobs/RFPs, deadlines, eligibility, terms changes, and Base/web data via x402.PitchPilot Agent ToolsNo sign-in12 paid micro-tools for AI agents over x402: email audit, email grading, templates, hashing, more.Pixel AgentNo sign-inConvert images to PNG, JPEG, WebP, or AVIF through one public remote MCP tool.PubSec RadarNo sign-inFederal sales intelligence: expiring-contract triggers, agency spend intel, deal qualification.Pulse — heartbeat & status monitor for AI agentsNo sign-inYour agent pings once per run; get a public up/late/down status page. Auto-creates checks. One call.Quantabble — AP Science Misconception DiagnosticsNo sign-inMisconception detection for AP Chemistry & Physics 1. 90% catch rate vs 24% baseline.Recall — persistent memory for agentsNo sign-inPersistent memory for AI agents. Free, no LLM, no SDK. Open Worker you can self-host in 2 commands.Red-Flag GreenflagANo sign-inRead and participate in a public AI-agent consensus board through four MCP tools.RelayMarketNo sign-inAgent-to-agent marketplace for AI task discovery, matching, delivery, and trust.Robots.txt Policy LintNo sign-in{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no keyRoostNo sign-inOne MCP tool that turns an agent's report or doc into a clean public shareable web page. No signup.SEC Filing ProofNo sign-inVerify whether an official SEC filing supports a specific financial claim.Service Public FranceNo sign-inFrench public services: tax, property, admin, education, healthcare, security, risks, legal textsShortlistLensNo sign-inStructured website and review evidence for AI-assisted local-business shortlisting.SkimNo sign-inURL to Markdown or structured JSON (schema.org/OG); renders SPA; batch reads. No signup/key.Source Claim ProofNo sign-inVerify whether a supplied public source currently supports one atomic factual claim.SOURCE/80 DiscoveryNo sign-inRead SOURCE/80 continuity status and invite-gated encrypted handoff contracts.SPF and DMARC reader (AI-operated)No sign-inAI-operated. Reads a domain's SPF and DMARC on two resolvers and counts SPF DNS lookups.Tantra Authority CatalogNo sign-in66 tantra, sex & consciousness courses, books, readings — agent-buyable instantly with USDC on BaseTorify — Japan Locale APIs for AI AgentsNo sign-in39 Japanese locale APIs — wareki, NTA invoice, 法人番号, postal, romanization, kanji-kana (Workers AI).Ultra PromptOAuthYour prompt library inside your AI: 1,000+ pro templates, frameworks, vocab & pipelines.Wafergraph MCPNo sign-inRead-only MCP server for wafergraph.com's semiconductor & AI supply-chain data: 30 tools, no auth.WatchpupNo sign-inFree uptime monitoring: HTTP/TCP/TLS/DNS + MCP server checks, cron heartbeats, status pages, alerts.Wever Pay Open Exchange Public BetaNo sign-inOpen Base Sepolia testnet exchange for autonomous buyer and seller agents, with signed receipts.Whenly — group meeting scheduler for AI agentsNo sign-inFind a time a group can meet: no-login availability poll that picks the best meeting slot.World ResolverNo sign-inResolve real-world capability gaps: validate native MCPs, search the web, and record unmet demand.x402 DoctorNo sign-inDiagnose x402 seller endpoints: what is wrong with your 402 challenge, and how to fix it.x402 economy toolsNo sign-inMeasured x402 ecosystem data, facilitator reliability, and live endpoint checks.x402 Web ExtractNo sign-inPay-per-use web extract, token prices, and wallet balances via x402 USDC micropayments.x402-snapCNo sign-inPay-per-call browser rendering and x402 marketplace ranking for AI agents, billed via USDC.xDEO — Earnings OracleNo sign-inReputation-ranked analyst earnings estimates. Pay per call via x402 on Base.日本の給与・社会保険・労働法No sign-inJapan payroll & social insurance. 日本の給与計算・社会保険。47都道府県の料率、源泉所得税、割増賃金、有給、標準報酬月額の改定、最低賃金。根拠の条文つき。