"Free PostgreSQL Database Solutions" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
Go MCP server for GitLab: 2 dynamic tools reach 1000+ REST/GraphQL actions. Free/CE, no paid tier.
Kaiva Bridge turns an OpenAPI spec, API docs link, database, spreadsheet or documents into a hosted MCP server. Every tool starts switched off and you choose which ones to expose. Teammates connect from Claude or ChatGPT by signing in with OAuth; your API credential is stored encrypted and never shown to the AI. Free plan: 3 servers and 200,000 tool calls a month, no card. Pricing: https://kaiv.ai/bridge/pricing Security: https://kaiv.ai/bridge/security Docs: https://kaiv.ai/bridge/docs
Agent utilities: read big pages without filling context, exact math, dates, parsing. Free.
A portable knowledge-graph memory you pass in and get back. No database. 4 of 6 free.
Generate structurally valid test IBANs for 91 countries (MOD-97 and national check digits), validate any IBAN and export lists. Free, no sign-up.
Free MCP server of security & dev API tools -- supply-chain, CVE, DNS, WHOIS, OFAC, Cosmos SDK.
Validate and clean CSV before import. Find duplicates, missing values and invalid dates with row-level reports. Apply only the cleanup you request; files are not retained. Run view_csv_demo free without a key. Custom CSV: EUR 9 for 100 operations, valid 90 days, no subscription. Setup: https://check.orvel.dev/docs/
Check a product CSV, handles, variant matrices and metafield keys. 4 of 6 free.
Webhook delivery for agents and workflows, with encrypted queues, retries and signed relay observations. 100 free admissions per hook/day; extra pack: 0.10 USDC for 100. Setup and n8n guide: https://datoka.dev/hooks. Recipients must deduplicate events.
Developer kits and design packs for AI agents, paid in USDC over x402. Free API readiness check.
It connects with Smart Data models database with more than 1000 open licensed data models and helps you to create applications and systems interoperable with existing standards or real applications
Scores how well AI agents will use your API, 0-100, from its OpenAPI spec. Free and read-only.
Vehicle routing, 3-D packing, cutting stock, rostering and knapsack with OR-Tools. 7 of 11 free.
Fleet entry point: 22 hosted MCP servers, 160 tools, 110 free. Searches 138 agent skills.
Search 161,000+ free hand-drawn Infyicon icons in four matching styles and fetch ready-to-embed SVG markup or PNG URLs, plus CSS class lookup for the 61,000-glyph Infyicon UI webfont. Free with attribution, no API key required.
Diagnose why an AI agent failed and get the verified fix instantly. Free, no token.
Create, edit, share and render real-time collaborative diagrams and mindmaps on livediagram.app. Describe flowcharts, architecture, org charts or mind maps as nodes and edges (or Mermaid) and the server lays them out. Free and open source.
Search 161,000+ free icons; get SVG (single/bulk), PNG, related icons, webfont classes. No API key.
Send and receive webhooks without building delivery queues or customer webhook controls. Relin lets your software and AI assistants set up inbound handlers, manage outbound events and customer endpoints, inspect delivery health, and retry failed deliveries. A generous free plan is available; no paid subscription is required.
