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Bitrefill turns USDC on Base into everyday digital goods inside the conversation: gift cards, mobile refills, and travel eSIMs. The default path signs in once with the user’s Base wallet, searches the catalog, creates an order, pays with USDC, then returns fulfillment details in chat. Chain: Base mainnet. Operations: catalog search, product details, checkout, invoice status, x402 payment, direct USDC payment for existing-account flows, and code or eSIM delivery.
Wallet sign-in and bearer credentials. The default flow uses SIWX/SIWE with Base MCP sign. Redemption codes, eSIM links, JWTs, and invoice details are sensitive and should only be shown when needed.

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Install Bitrefill MCP for existing accounts

The default agent-commerce path uses Base MCP and the Bitrefill HTTP API. Existing Bitrefill account users can also connect the Bitrefill MCP: 
claude mcp add bitrefill --url https://api.bitrefill.com/mcp
Keep buy-products out of auto-approval. The plugin also supports npx @bitrefill/cli@latest in shell-capable harnesses.

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Try it

Gift card
Buy me a $25 Amazon US gift card with USDC on Base
Browse
Show me Steam gift cards available in the US
Existing account
Use my existing Bitrefill account to buy a travel eSIM

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Pattern

Bitrefill uses Base MCP for web_request, sign, x402 payments, and direct send of USDC. It does not use send_calls. The assistant signs the SIWX payload, uses the returned JWT for catalog and checkout calls, confirms product, denomination, and total price, then pays the Base USDC x402 requirement or direct invoice destination. After payment, the assistant polls status and returns fulfillment data carefully because codes and QR links are bearer credentials.

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Reference

Full plugin spec on GitHub

Path selection, SIWX headers, x402 payments, account connector setup, and fulfillment safety notes.