PHANTOM ID — agent payments (USDC on Base)

IDPHANTOM MCP Server

@phantomid/mcp-server exposes IDPHANTOM payments as standard MCP tools so an AI agent can quote, authorize, submit, and verify agent-to-agent payments through IDPHANTOM.

Production defaults to:

https://pay.idphantom.com

Install

npx @phantomid/mcp-server

For MCP clients, configure the server command and environment:

{

"mcpServers": { "phantom-id": { "command": "npx", "args": ["@phantomid/mcp-server"], "env": { "PHANTOM_API_URL": "https://pay.idphantom.com", "PHANTOM_API_KEY": "pk_live_..." } } } }

PHANTOM_API_URL is optional when using production. PHANTOM_API_KEY is required for normal paid API usage after registration.

Self-serve tools environment (AGP-100)

The MCP tools phantom_register and phantom_authorize_budget read their signing keys only from the environment (never from command-line flags — argv leaks into shell history and process listings):

Without PHANTOM_PAYER_PRIVATE_KEY, phantom_register runs in manual mode: pass payer_wallet and it returns the registration challenge plus step-by-step signing instructions.

Funnel events (AGP-100 F1.4)

The server emits one JSON line per event on stderr, prefixed with [funnel]:

[funnel] {"event":"install","ts":"...","source":"external",...}

Events: install → register_start → register_complete → first_pay → repeat. Scrape these lines to build the onboarding funnel (install → register → first pay → repeat). Traffic tagged PHANTOM_FUNNEL_SOURCE=internal must be aggregated separately from external volume.

Connect Your Agent In 5 Minutes

Registration is self-serve and costs $2 USDC on Base mainnet. The CLI signs locally and never prints the private key.

export PHANTOM_PAYER_PRIVATE_KEY="0x..."

export PHANTOM_ROUTER_ADDRESS="0x..." npx @phantomid/mcp-server init --name my-agent

The init flow calls:

1. POST /v1/register
2. POST /v1/intents/:id/authorize
3. POST /v1/intents/:id/submit
4. GET /v1/register/:reference
5. POST /v1/register/:reference/claim

On success it prints the account id and the API key once. Store the returned key as PHANTOM_API_KEY.

Flags are supported for non-sensitive options. The payer key is environment-only (never a flag — command lines leak into shell history and process listings):

export PHANTOM_PAYER_PRIVATE_KEY="0x..."

npx @phantomid/mcp-server init \ --api-url https://pay.idphantom.com \ --router-address 0x... \ --name my-agent

Tools

The server supports newline-delimited JSON-RPC over stdio.

quote_payment

{

"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "quote_payment", "arguments": { "payer_wallet": "0x...", "recipient_wallet": "0x...", "asset_contract": "0x...", "amount": "1000000", "chain_id": 8453, "idempotency_key": "quote-001", "payer_agent_id": "buyer-agent", "recipient_agent_id": "seller-agent" } } }

authorize_payment

{

"jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "authorize_payment", "arguments": { "payment_intent_id": "pi_...", "payer_signature": "0x..." } } }

submit_payment

{

"jsonrpc": "2.0", "id": 3, "method": "tools/call", "params": { "name": "submit_payment", "arguments": { "payment_intent_id": "pi_..." } } }

verify_payment

{

"jsonrpc": "2.0", "id": 4, "method": "tools/call", "params": { "name": "verify_payment", "arguments": { "payment_intent_id": "pi_...", "receipt_id": "rcpt_..." } } }

Limits

Default production policy limits are:

• 50 USD maximum per payment
• 500 USD maximum per day

Payments above those limits are rejected by the PHANTOM ID API.

Publish

npm publish --access public