Free AI agent payment tools (2026)

AI agent payment tools that you can use without paying: open-source projects plus tools with a free plan. Here are all 16 from the AgentScout directory.

Updated October 21, 2026

How we picked and ranked: tools are matched by category, the pricing each maker states and what each tool says it does. They are ranked by GitHub stars as recorded on each listing (link checks 2026-10-21); tools without a tracked repo follow, by listing maturity. No paid placements.

1. 

   1. Bindu

   agent infraOpen source★ 10,056 GitHub stars

   Identity, communication and payments layer that lets AI agents talk to and pay each other.

   Pricing (as stated): Open source · Mature

2. 

   2. Sphere SDK

   cryptoOpen source★ 5,385 GitHub stars

   TypeScript SDK that gives autonomous agents an identity and wallet on the Unicity network to find, negotiate and settle payments with other agents.

   Pricing (as stated): Open source · Mature

3. 

   3. MonoCode

   codingOpen source★ 3,194 GitHub stars

   MonoCode is a desktop app that puts the coding agents you already pay for behind one interface. It drives Claude Code, Codex, Cursor, Grok Build, OpenCode, Antigravity, Pi, Hermes Agent, Devin and others, using the subscriptions and logins already on your machine, so you never buy tokens through it. Each tab is an agent session and one composer sends work to whichever agent you pick, so several sessions can run side by side. It runs on macOS, Windows and Linux, with an iOS app in public beta.

   Pricing (as stated): Free and open source (MIT); uses your existing agent subscriptions, sells no tokens · Active

4. 

   4. Stripe Agent Toolkit

   MCP serversOpen source★ 1,953 GitHub stars

   Stripe's agent toolkit and MCP server for customers, payments and billing.

   Pricing (as stated): Open source · Active

5. 

   5. PayPal MCP

   MCP serversOpen source★ 13 GitHub stars

   PayPal's MCP server for invoices, orders, payments and other PayPal operations from agents.

   Pricing (as stated): Open source · Active

6. 

   6. Accordio AI

   business agentsFreemium

   Adds time tracking, contract signing, invoicing and payments to Claude through a free MCP connector.

   Pricing (as stated): Freemium · Active

7. 

   7. Churnkey MCP

   MCP serversPaid

   Churnkey's MCP server for reading and managing cancel flows, retention metrics and payment recovery.

   Pricing (as stated): MCP server free and open source; requires a Churnkey plan (Starter $250/mo billed yearly) · Active

8. 

   8. Crossmint for AI Agents

   cryptoFreemium

   Wallets, stablecoin payments and checkout APIs built for AI agents.

   Pricing (as stated): Free tier (1,000 wallets); usage-based beyond; enterprise custom · Active

9. 

   9. Daydreams

   cryptoOpen source

   Open-source tools, payment rails and markets for building agents that buy, sell and coordinate work on-chain.

   Pricing (as stated): Open source · Active

10. 

    10. Openfort

    cryptoFreemium

    Open-source stablecoin wallet infrastructure with policy-gated agent wallets, gas sponsorship and x402 support.

    Pricing (as stated): Freemium · Active

11. 

    11. Slash

    MCP serversFreemium

    Business-banking MCP server that lets AI agents create cards, set spend limits and send payments, including stablecoins.

    Pricing (as stated): Freemium · Active

12. 

    12. Sundae

    personal agentsFreemium

    Sundae is a personal AI assistant you text from iMessage or Android RCS, with no app or account needed. It works on a computer of its own: it books tables, finds flights at current prices, compares shops, reads letters and photos you send, sets reminders, watches prices and builds simple web pages, then texts back with a screenshot so you can check. It remembers what you tell it, asks before spending money, sending, deleting or opening accounts, and stops at checkout for you to pay. It is free to start with a daily limit, with a paid Plus plan, and is in limited beta.

    Pricing (as stated): Free to start with a daily limit; paid Plus plan raises it; limited beta · Active

13. 

    13. Wren Pre-sign Check

    security & governancePaid

    Wren Pre-sign Check is a pay-per-call x402 API that an AI agent calls before it signs anything with its wallet. Send a transaction (to + data), an EIP-712 typed-data payload or untrusted text, and it returns block, review or allow, the decoded call in plain words and every finding: unlimited approvals, Permit and Permit2 signatures, setApprovalForAll, EIP-7702 delegation, contract deployment and injected instructions. With an optional wren-guard policy (allowlist, spenders, caps) it also blocks unknown recipients, over-cap amounts and lookalike addresses. It is a static check and stores nothing you send; free demos show real output.

    Pricing (as stated): Paid: $0.01 in USDC on Base per check over x402 (EIP-3009 payment authorisation, no approvals); free demo endpoints with fixed examples · Active

14. 

    14. Wren x402 Doctor

    cryptoFreemium

    Wren x402 Doctor helps sellers of x402 pay-per-call endpoints, the payment standard AI agents use to pay for APIs in USDC, get listed in the Coinbase CDP Bazaar and stay listed. A free lint checks a 402 response against the x402 v2 spec and the Bazaar listing rules (networks, amounts, payTo checksum, description length, injection-like text, schema and metadata), and now also checks a seller's OpenAPI and x402 discovery documents. A paid health check returns every Bazaar listing for your wallet address with 30-day calls, unique payers and an estimated delisting date, and a paid market check (GET /market) returns up to 20 comparable live Bazaar listings with USD price, 30-day calls and payers, plus price quartiles.

    Pricing (as stated): Freemium: free lint of any 402 response and discovery documents; Bazaar health check $0.10 and market check $0.02 in USDC on Base per report over x402 · Active

15. 

    15. x402

    cryptoOpen standard

    Open HTTP payment standard so agents can pay for APIs per request in stablecoins.

    Pricing (as stated): Open standard · Active

16. 

    16. Self Agent Vault

    agent infraFreemium

    Payment and login layer for AI agents: agents check out and sign in using mock tokens, while real card numbers and passwords are swapped in out of the agent's view, with spending caps, merchant allowlists and a kill switch.

    Pricing (as stated): Free, Plus and Enterprise tiers; first 1,000 sign-ups get Plus free for three months · Live; launched Oct 15, 2026 by Self Labs

FAQ

What are the best free AI agent payment tools?

Ranked by tracked GitHub stars, the top free AI agent payment tools in our directory are Bindu, Sphere SDK, MonoCode, Stripe Agent Toolkit, PayPal MCP. Stars measure popularity, not fit, so compare a few against your own task.

How many free AI agent payment tools does AgentScout list?

16 tools match. This page shows the top 16. Pricing mix on this page: Freemium (7), Open source (6), Paid (2), Open standard (1).

Are these tools really free?

Pricing is what each maker states on their site. Open-source tools are free to self-host but may need a paid model API key or offer paid cloud plans; freemium tools have a free plan with limits. Check each official site.

Where can I see every tool for agent payments?

Our task page lists all 23 tools we match to agent payments.

Related: All tools for agent payments · crypto (6) · MCP servers (4) · agent infra (2) · business agents (1)

By role: For crypto traders · For e-commerce teams

All popular searches · AI agents by role · Free tools

Best-of lists: All best lists

Related categories: Crypto · MCP servers

Facts come from our directory listings; pricing is as each maker states it and can change. Check official sites before you choose.