Interline

Name: Interline
Author: Choppaaahh

by Choppaaahhversion 0.1.3i★ –iRuns on your computer

Registry nameio.github.Choppaaahh/interline

Install

Overview

Description from the maker (original English)

Neutral, non-custodial MCP payment router: discover rails, then pay across them.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Online shops & payments
You need to fill in: APV0_BUYER_PRIVATE_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: APV0_BUYER_PRIVATE_KEY, APV0_NETWORK

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "interline": {
      "command": "uvx",
      "args": [
        "interline"
      ],
      "env": {
        "APV0_BUYER_PRIVATE_KEY": "your-value",
        "APV0_NETWORK": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add interline --env APV0_BUYER_PRIVATE_KEY=your-value --env APV0_NETWORK=your-value -- uvx interline

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "interline": {
      "command": "uvx",
      "args": [
        "interline"
      ],
      "env": {
        "APV0_BUYER_PRIVATE_KEY": "your-value",
        "APV0_NETWORK": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "interline": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "interline"
      ],
      "env": {
        "APV0_BUYER_PRIVATE_KEY": "your-value",
        "APV0_NETWORK": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

APV0_BUYER_PRIVATE_KEY secret env
Your own wallet private key (0x...). Stays in your env; the server never holds funds. Required only for pay_for_resource, not for discovery.
APV0_NETWORK env
base-sepolia (testnet) or base (mainnet). Default base-sepolia.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Choppaaahh, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Online shops & paymentsi

More stars than 0% of the other 1746 servers in this category
Published to the registry more recently than 15% of the other 1746 servers in this category
Basic checks equal to or better than 100% of the other 1746 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Interline safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: APV0_BUYER_PRIVATE_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.3) reached the registry 5 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spree Commerce: open-source B2B and marketplace ecommerce, Stripe MCP, MCP Cn Commerce

Alternatives

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Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Interline — agent-to-agent payment router

Archived (2026-10-10). Interline is no longer maintained. The code stays here for reference; nothing is being developed, and the testnet demos are not monitored.

An agent-to-agent payment router: one agent does work, another agent pays for it, no human keys a card. Interline is a neutral, non-custodial router over the fragmented agent-payment-rail stack — *"OpenRouter for agent payments."* Built on x402 (HTTP-402 micropayments, USDC), aggregator-shaped so adding a rail is one adapter, not a rewrite.

Today it routes payments across three live rails — x402 USDC on EVM (Base Sepolia) and on Solana (devnet), plus MPP on Tempo (Moderato testnet) — all behind one Paywall.gate() call. Real on-chain agent-to-agent settles are confirmed on all three. It ships an MCP router so agents can discover + pay endpoints, and includes a Google-AP2 inbound adapter — a signed AP2 mandate (verified, constraint-checked + freshness-gated) settles non-custodially on the rails.

Run the demo (no wallet, no faucet, no risk)

python3 -m venv .venv && source .venv/bin/activate

pip install -r requirements.txt python3 run_demo.py

Expected: DEMO PASS — agent paid agent, settlement receipt issued.

What just happened (the x402 "exact-evm" loop):

buyer GET /work

-> seller 402 + PaymentRequirements {amount, asset=USDC, payTo, network} -> buyer signs an EIP-3009 transferWithAuthorization (gasless USDC auth) -> buyer retries with X-PAYMENT header (base64 signed payload) -> facilitator VERIFIES the signature (real signer-recovery) + checks policy -> facilitator SETTLES (mock: fake tx hash; live: on-chain USDC transfer) -> seller 200 + work product + X-PAYMENT-RESPONSE receipt (tx hash)

The facilitator's verify step is real cryptography even in mock mode — it recovers the EIP-712 signer and matches it to the authorization. Only the on-chain broadcast is mocked. So a passing demo proves the buyer's signing is protocol-correct against real USDC.

Files

file	role
`router/paywall.py`	the reusable `Paywall` primitive — gate any endpoint behind x402 in one `.gate()` call
`router/ledger.py`	settlement receipt-ledger → `logs/agent_payment_settlements.jsonl` (audit trail)
`router/seller.py`	FastAPI agent that sells work — defines the requirements + work, wires one `Paywall.gate()`
`router/buyer.py`	agent that auto-pays 402s (`pay_and_get`) with a client-side spend limit
`router/eip3009.py`	the one crypto-subtle file: EIP-3009 typed-data, shared by buyer+facilitator so they can't drift
`router/facilitator_mock.py`	in-process verify+settle (real sig check, mock chain) — the dry-run rail
`router/facilitator_real.py`	live x402 facilitator over HTTP via the x402 SDK's own client; `get_facilitator()` picks mock↔real by config
`router/config.py`	network/asset facts + `.env` loader; mock↔testnet↔mainnet is a one-line env change
`run_demo.py`	end-to-end smoke (ephemeral keys, mock facilitator)
`run_live.py`	live runner — settles a real x402 payment on Base Sepolia

Go live (Base Sepolia testnet)

Two testnet wallets (buyer signs, seller receives):

   python3 -c "from eth_account import Account; a=Account.create(); print('addr', a.address); print('key', a.key.hex())"

Do this twice. Keep the keys out of git (use .env).

Fund the buyer with Base Sepolia testnet USDC (Circle faucet) + a little testnet ETH for any gas the facilitator relays.
`.env` (copy .env.example → .env, it's gitignored + auto-loaded):

   APV0_NETWORK=base-sepolia

APV0_BUYER_PRIVATE_KEY=0x... # buyer testnet key (signs) APV0_SELLER_ADDRESS=0x... # seller address (receives) APV0_FACILITATOR_URL=https://x402.org/facilitator

4. **Run it live:**

   python3 run_live.py

The seller now uses RealFacilitator (the x402 SDK's own facilitator client), the buyer auto-pays the 402, and x402.org broadcasts the EIP-3009 USDC transfer on-chain. You get a real tx hash → https://sepolia.basescan.org/tx/ .

Gasless: with EIP-3009 the facilitator relays gas, so the buyer only needs

testnet USDC, not ETH.

Gate your own endpoint (the product primitive)

from router.paywall import Paywall

from router.facilitator_real import get_facilitator

paywall = Paywall(get_facilitator(), my_requirements_fn) # mock ↔ real by env

@app.get("/my-endpoint") def my_endpoint(request: Request): return paywall.gate(request, lambda: do_expensive_work())

That one .gate() call handles the whole x402 V2 dance — 402 challenge → verify → settle → record receipt → deliver — and appends every settlement to the receipt-ledger. The deployer never touches the protocol or holds a key.

v1 dogfood — pay an agent, get REAL work back

v0 proved the *payment*. v1 proves the *loop*: a buyer agent pays → a seller agent does real inference → returns the result + a settlement receipt. The seller's _do_the_work(task) is the product's integration point (plug in your own model/compute/service).

APV0_OPENROUTER_KEY=sk-or-... python3 run_v1_dogfood.py "your task here"

→ V1 DOGFOOD PASS — agent paid agent for real work ✅ (mock payment + real model call by default; set APV0_NETWORK=base-sepolia for a real on-chain settle under the same loop). Without a key it returns a stub so the product still runs.

This is the authentic loop: an agent doing real work, metered + paid-for over x402 — the same primitive whether the work is a model call, a compute job, or any other billable agent task.

Interline

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Online shops & paymentsi

Common questions

Alternatives

Spree Commerce: open-source B2B and marketplace ecommerce

Stripe MCP

MCP Cn Commerce

README from the maker

Interline — agent-to-agent payment router

Run the demo (no wallet, no faucet, no risk)

Files

Go live (Base Sepolia testnet)

Gate your own endpoint (the product primitive)

v1 dogfood — pay an agent, get REAL work back