"agent-api" matching MCP servers:

MCP server that checks an x402 paid endpoint before an agent pays it, and checks afterwards that the receipt opens to exactly one real on-chain settlement. Two tools, no account, no API key.

The MCP gateway that lets any AI agent discover and pay metered APIs on Base or Solana — without the user wiring payments themselves.

Enables configuring and running StableOps Agent Payments while keeping secrets user-controlled, with wallet-pairing via user signatures and runtime payments through a user-operated signer sidecar.

Enables an Alexa+-style voice agent to watch recurring payments and propose renew/deactivate/cancel recommendations without ever being able to move money itself.

Foundational MCP/A2A-native core platform for secure credential injection, native x402 micropayments, and Agent-to-Agent routing.

Provides trust and commerce checks for agent operators through HTTP x402 and a remote MCP endpoint, enabling clients to inspect x402 quotes, MCP handshakes, and A2A cards and to run paid verification and data tools.

Per-agent quota meter for the A2A network, enabling quota checks with USDC settlement on Base L2 via x402 envelopes.

A Prime Agent skill that connects to Stripe's official remote MCP server to inspect and manage Stripe resources via OAuth.

A buyer-side HTTP 402 runtime and agent-commerce surface inspector for autonomous agents, enabling inspection of paid-action surfaces and execution of payment loops.

Enables an AI agent to act as a merchant, selling catalog items and issuing USDC invoices with cross-chain payment support via Arcorapay.

CLI and local stdio MCP payment runtime for AI agents on macOS Apple Silicon. Supports x402 offer inspection and payment preparation, with signing and execution requiring foreground owner approval.

Enables AI agents to check their wallet address and USDC balance, preview the cost of an x402 call, and pay for API requests in USDC on Base without an account or API key. Spend caps, allow-lists and blocked contracts are enforced in code before anything is signed, so a prompt injection cannot bypass them.

AI Agent Hub is a pay-per-call API platform for AI agents Every call is billed automatically in USDC using the x402 protocol - there is no API key, no account, and no signup. Agents get instant access to data queries, file storage, and ad impressions, paying only for what they actually use. The same tools are also exposed natively over MCP, so any MCP-capable agent can discover and call them

MCP server that provides tools for retrieving transaction context and recording AI decisions or creating human reviews for payment risk exceptions. Enables LLM agents to handle exception transactions in a hybrid payment-decisioning workflow.

A standard MCP server for discovering AI agents and negotiating signed skill contracts. Buyer-seller payments are settled directly outside the platform; Agent Economy Engine collects only a platform fee after both parties attest completion.

Checks live x402 routes across Base, Solana, and Algorand before agents spend. $0.003 USDC settles only for a valid live eligible route; normal typed misses are not settled. Free preview and validate tools. Seller payment is separate; the agent keeps its wallet. Optional signed route-binding receipts support buyer-side checks.

A shopper’s agent searches stores, compares prices and buys with the shopper’s approval.

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.

PayCheck is an MCP server that checks a planned payment before an agent pays.

MCP server for the Gravv payments API that lets AI assistants onboard customers, run KYC, open accounts, move money, issue cards, and exchange currency, with built-in documentation search and safety confirmations for money-moving operations.