"A server for searching academic papers and retrieving metadata" matching MCP servers:

Credit and payments for AI agent developers — over MCP. No crypto required

Free x402 endpoint checker plus paid report and metadata tools. Remote MCP server for agents. Written by AI named Nock, not a human.

Pay-per-call USDC payment proxy for AI agents. Issue scoped Pay Tokens with hard spending caps and auto-journal every charge to freee / Money Forward / QuickBooks.

An MCP server that wraps the Check Payroll API, providing 263 tools for managing companies, employees, contractors, payrolls, tax configuration, and more.

A read-only MCP server for the open-banking.io PSD2 API that lets AI agents query personal bank balances and transactions via natural language, with zero-knowledge encryption ensuring all sensitive data is decrypted in-process and never exposed to third parties.

MCP server exposing a fictional payment domain as tools, resources, and prompts, enabling reasoning over transactions, payment hubs, services, and system health.

Talk to your DeonPay merchant account from any MCP-compatible AI host. Enables reading transactions, creating payment links, inspecting subscriptions, and more.

Generate crypto QR codes (BTC, ETH, SOL, USDC, USDT, EURC) and manage payment sessions from Claude Desktop or any MCP client. Non-custodial, free.

Exposes all 379 Invoice Ninja v5 REST API endpoints through three consolidated tools (list, describe, call), enabling full invoice management and business operations via natural language.

Create invoices from any MCP client via the Invovate API — compute totals and generate PDF, JSON, or UBL invoices in 11 languages. Exposes four tools: calculate_invoice_totals (no API key needed), generate_invoice_pdf, generate_invoice_ubl, and get_invoice_capabilities.

Enables AI agents to directly operate ChainPay cryptocurrency payment system, including order creation, balance checks, and withdrawals.

MCP server for the Monei API that gives AI agents access to wallets, transfers, crypto sends, swaps, offramp, and bill payments through natural language.

Enables AI agents to discover, negotiate, and settle payments on the AGIRAILS network directly from MCP-compatible editors, supporting escrow for complex jobs and instant x402 payments.

Lets AI assistants shop at UCP-enabled merchants through tools for discovery, checkout, discounts, fulfillment, and payment.

Enables interaction with the Yugo Payments API to manage payins, payouts, and accounts through auto-generated MCP tools.

Read-only MCP server for the RareCloud API, enabling AI agents to list servers, browse the catalog, check billing, and plan deployments.

Enables AI agents to browse, accept, and complete paid offers from a marketplace, allowing users to earn real money through app tasks and get paid instantly.

Enables interaction with Efí Bank's API for PIX payments, charge management, webhooks, and account operations.

Enables managing Corpay One accounts-payable workflows including expense listing, coding, and policy-controlled writes, with read-only defaults and audit logging.

An MCP server for KG Financial's payment services integration, enabling AI coding tools to generate accurate code by automatically searching payment integration documentation through natural language queries.