Plumbline — a trust layer for LLM answers alternatives
12 MCP servers, A2A agents and x402 APIs that also do databases, ai models & inference, ranked by how much they overlap with Plumbline — a trust layer for LLM answers (MCP server), live ones first.
Compared
| Name | Type | Live | Tools / skills | Check |
|---|---|---|---|---|
| Plumbline — a trust layer for LLM answers (this one) | MCP server | Yes | – | – |
| Turn Zero Cloud | MCP server | Yes | – | 55/100 |
| AnythingMCP | MCP server | Yes | – | – |
| CloudQuell | MCP server | Yes | – | – |
| Entity Enricher | MCP server | Yes | 40 | 80/100 |
| Echo Memory | MCP server | Yes | – | 55/100 |
| Camber - Remote Agentic Data Science | MCP server | Yes | – | – |
| Validate Agent | A2A agent | Yes | 12 | – |
| EOSL.ai — Hardware End-of-Life Database | MCP server | Yes | 5 | 90/100 |
| cap-rate-signals | MCP server | Yes | – | 55/100 |
| Ekwo OS — open source accounting: ledger, invoices and VAT on your own Supabase… | MCP server | Yes | – | 55/100 |
| Google BigQuery | MCP server | Yes | – | 55/100 |
| JieBang Tools | MCP server | Yes | – | 55/100 |
Live = answered our latest free daily check. Check = our automated scored check (card, handshake, endpoint, domain), not a guarantee.
The alternatives
- Turn Zero Cloud Live MCP
Free backend for apps built with Claude Code and Codex: hosting, database, storage, sign-in, AI.
MCP server · ai.turnzero · check 55/100 · also does databases, ai models & inference
- AnythingMCP Live MCP
Any REST/SOAP/GraphQL/OData/SQL API as MCP tools for Claude & ChatGPT. 373 connectors: SAP, ERP.
MCP server · io.github.HelpCode-ai · also does databases, ai models & inference
- CloudQuell Live MCP
Ask about AWS, Azure, GCP, OpenAI, Anthropic and Snowflake costs, budgets, and anomalies.
MCP server · com.cloudquell · also does databases, ai models & inference
- Entity Enricher Live MCP
Multi-LLM entity enrichment: schemas, single/batch enrichment, fusion, model benchmarks.
MCP server · ai.entityenricher · 40 tools · check 80/100 · also does databases, ai models & inference
- Echo Memory Live MCP
Shared memory for AI agents, as a graph in your own Postgres. Writes never call an LLM.
MCP server · io.github.ayushcodes10 · check 55/100 · also does databases, ai models & inference
- Camber - Remote Agentic Data Science Live MCP
Remote data science agents for Snowflake, Databricks & BigQuery in Claude/Cursor via MCP
MCP server · com.cambercloud.camber-mcp · also does databases, ai models & inference
- Validate Agent Live A2A
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 emails, URLs, JSON sc…
A2A agent · Validate Agent · 12 skills · also does databases, ai models & inference
- EOSL.ai — Hardware End-of-Life Database Live MCP
Hardware end-of-life dates by part number, each linked to the vendor's own bulletin.
MCP server · ai.eosl · 5 tools · check 90/100 · also does databases
- cap-rate-signals Live MCP
Cap Rate Signals — US Real Estate Investment Intelligence Identifies US real estate markets that are about to reprice upward, before consensus catches up. Tracks confirmed corporate investment — semiconductor fabs, phar…
MCP server · capratesignals · check 55/100 · also does databases
- Ekwo OS — open source accounting: ledger, invoices and VAT on your own Supabase… Live MCP
Double-entry books an agent keeps as the user: invoices, VAT returns, 130 country packs.
MCP server · ai.ekwo · check 55/100 · also does databases
- Google BigQuery Live MCP
Run SQL queries on BigQuery datasets, list tables, and inspect schemas. Manage jobs, export results, and explore data warehouse resources.
MCP server · bigquery · check 55/100 · also does databases
- JieBang Tools Live MCP
20 free developer tools - JSON/YAML, SQL, XML, Cron, QR code, SEO check, URL shortener, image converter, timezone, and more. No API key required.
MCP server · ajie-jiebang · check 55/100 · also does databases