 Issue virtual cards agents can spend on, with real-time authorization decisions, per-card spend controls, and full transaction visibility MCPOpenAPIllms.txt | virtual-cards+4 | MCP+2 | MPP | api-key, Payments | 5/5 | | |
 Connected Apps and M2M auth — treat each agent as its own OAuth client, and stand up OAuth-compliant MCP servers MCPOpenAPIllms.txt | m2m-auth+4 | MCP+2 | — | m2m-oauth, Identity | 5/5 | | |
 Postgres with pgvector, auth, storage, edge functions, and a remote MCP server MCPOpenAPIllms.txt | database+4 | MCP+2 | — | api-key, Memory | 5/5 | | |
 Search, extract, and crawl endpoints tuned for RAG and agent loops MCPOpenAPIllms.txt | search+3 | MCP+2 | — | api-key, Search | 5/5 | | |
 Open commerce standard from Google and Shopify for agentic shopping journeys across retailers, pairing with AP2 for the payment leg OpenAPIllms.txt | ucp+5 | OpenAPI+1 | UCP | none, Payments | 5/5 | | |
 API key issuance, per-key rate limits, and usage analytics for machine-to-machine access MCPOpenAPIllms.txt | api-keys+3 | MCP+2 | — | api-key, Identity | 5/5 | | |
 Serverless Redis, Vector, and QStash with per-request pricing and an official MCP server MCPOpenAPIllms.txt | redis+4 | MCP+2 | — | api-key, Memory | 5/5 | | |
 Voice agent platform handling telephony, turn-taking, interruptions, and warm transfers MCPOpenAPIllms.txt | voice-agents+3 | MCP+2 | — | api-key, Messaging | 5/5 | | |
 Unified model endpoint with failover, spend limits, and observability, wired into the AI SDK MCPOpenAPIllms.txt | llm+3 | MCP+2 | — | api-key, Models | 5/5 | | |
 AuthKit, Connect, and MCP auth — OAuth flows, scoped tokens, and bot detection for agent access MCPOpenAPIllms.txt | oauth+4 | MCP+2 | — | m2m-oauth, Identity | 5/5 | | |
 Open HTTP 402 standard for per-request stablecoin payments, now at v2 and governed by the x402 Foundation OpenAPIllms.txt | x402+4 | OpenAPI+1 | x402 | x402-none, Payments | 5/5 | | |
 Thousands of app actions exposed to agents through a hosted MCP endpoint, no per-app integration work MCPOpenAPIllms.txt | automation+3 | MCP+2 | — | api-key, Platforms | 5/5 | | |
 Temporal knowledge-graph memory (Graphiti) with bi-temporal validity, so agents can query what was true when MCPOpenAPIllms.txt | agent-memory+3 | MCP+2 | — | api-key, Memory | 5/5 | | |
 Open protocol using signed mandates so agents can transact within user-defined limits, with x402 and card rails llms.txt | ap2+4 | llms.txt | AP2+1 | wallet, Payments | 4/5 | | |
 Open protocol for agent-to-agent discovery, task delegation, and streaming updates across vendors OpenAPIllms.txt | a2a+4 | OpenAPI+1 | — | none, Platforms | 4/5 | | |
 Blockchain node and data APIs — transfers, tokens, NFTs, and webhooks — payable per request over MPP MCPOpenAPIllms.txt | blockchain+3 | MCP+2 | MPP | api-key, Search | 4/5 | | |
 Commission-free US stocks, options, and crypto brokerage API with a free paper-trading environment MCPllms.txt | brokerage+5 | MCP+1 | — | api-key, Markets | 4/5 | | |
 Work graph — tasks, projects, and portfolios — over REST and a remote MCP server MCPOpenAPIllms.txt | tasks+2 | MCP+2 | — | m2m-oauth, Platforms | 4/5 | | |
 Speech recognition, diarization, and audio intelligence models via API OpenAPIllms.txt | stt+3 | OpenAPI+1 | — | api-key, Speech | 4/5 | | |
 Jira issues and Confluence pages over REST and a remote MCP server MCPOpenAPIllms.txt | issues+3 | MCP+2 | — | m2m-oauth, Platforms | 4/5 | | |