Open-source B2B and marketplace ecommerce; new stores include an MCP server for AI agents.
Runs in the cloud★ 15,812BSD-3-ClauseUpdated 7 days ago
Install
TensorFeed x402 Base Reader
Overview
Description from the maker (original English)
Read-only Base mainnet reader. Verifies x402 payment settlements + AFTA federation status.
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: TENSORFEED_RPC_URL
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:
TENSORFEED_RPC_URL
Values marked secret are keys to your account. Never share them or paste them into a chat.
You need
- npmNode.js installed (for the npx command)
Which app do you use?
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": {
"x402-base": {
"command": "npx",
"args": [
"-y",
"@tensorfeed/x402-base-mcp"
],
"env": {
"TENSORFEED_RPC_URL": "your-value"
}
}
}
}Run this in your terminal
claude mcp add x402-base --env TENSORFEED_RPC_URL=your-value -- npx -y @tensorfeed/x402-base-mcpFill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"x402-base": {
"command": "npx",
"args": [
"-y",
"@tensorfeed/x402-base-mcp"
],
"env": {
"TENSORFEED_RPC_URL": "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.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"x402-base": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@tensorfeed/x402-base-mcp"
],
"env": {
"TENSORFEED_RPC_URL": "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
- Optional Base mainnet RPC endpoint (Alchemy, Infura, etc) for higher rate limits. Must match the allowlist in src/rpc/allowlist.ts; non-allowlisted URLs fall back to public Base RPC with a stderr war…
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 against the domain tensorfeed.ai (the registry checks domain ownership)
- … 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 1748 servers in this category
- Published to the registry more recently than 10% of the other 1748 servers in this category
- Basic checks equal to or better than 100% of the other 1748 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 TensorFeed x402 Base Reader 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: TENSORFEED_RPC_URL
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 (0.2.1) 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 Node.js 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
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
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by stripe
Stripe’s official server lets AI view and manage customers, products, payments and invoices. Connect to Stripe’s cloud and sign in with OAuth.
Runs in the cloud★ 2,043MITUpdated 12 months ago
Install
MCP Cn Commerce
by TonyWang-hub
8 read-only MCP platform entries; support is operation-specific; merchant live acceptance pending
Runs on your computer★ 96MITUpdated 27 days ago
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.
@tensorfeed/x402-base-mcp
Read-only MCP server for verifying x402 USDC settlements on Base mainnet. Drop it into any MCP-compatible agent (Claude Desktop, Claude Code, Cursor, ChatGPT) to independently audit x402 payment receipts on-chain, parse publisher .well-known/x402 manifests, and check AFTA federation status. No private keys, no signing, no broadcasts.
npm install -g @tensorfeed/x402-base-mcpRelationship to Coinbase Base MCP
Coinbase shipped Base MCP (the official mcp.base.org server, launched May 2026) as the *transact-side* MCP: it connects an agent to a Base Account and lets the agent propose swaps, transfers, and x402 payments that the user approves in-wallet.
This package, @tensorfeed/x402-base-mcp, is the *verify-side* MCP. Once an x402 payment has been made (by Base MCP, by a server-side @coinbase/x402 middleware, or by any other x402 client), this server lets the calling agent independently check the on-chain settlement, parse the publisher's /.well-known/x402 manifest, and audit the receipt. Read-only chain visibility, no wallet.
The two are complementary, not competing. Use Base MCP to pay. Use this MCP to verify.
Why a separate verify MCP
x402 is a payment protocol where agents pay merchants in USDC on Base for paid API responses. When an agent receives a payment receipt back, it has two options for confirming that the settlement actually happened the way the receipt claims:
- Trust the merchant
- Read the on-chain Transfer event itself
Most existing EVM MCP servers either require a private key (so the agent can also send transactions, which is operationally risky and unnecessary for verification), or are generic multi-chain readers that don't speak x402. This server is the read-only, x402-aware option. Drop it into a Claude Desktop or Claude Code session and any agent can verify x402 payments without operating a wallet.
The TensorFeed-flavor tools (verify_afta_federation, tf_payment_lookup) compose the same primitives against TF's canonical surfaces and demonstrate the pattern. Use them or ignore them; the generic tools work fine on their own.
Installation
Claude Desktop
Add to claude_desktop_config.json:
{"mcpServers": { "tensorfeed-x402-base": { "command": "npx", "args": ["-y", "@tensorfeed/x402-base-mcp"] } } }
Claude Code
claude mcp add tensorfeed-x402-base -- npx -y @tensorfeed/x402-base-mcpOptional: bring your own RPC
The server defaults to the public Base RPC (https://mainnet.base.org), which is fine for casual use. For heavier workloads, set an Alchemy or Infura URL via TENSORFEED_RPC_URL. The URL must match the allowlist in src/rpc/allowlist.ts; anything else falls back to the public endpoint and logs a warning to stderr.
export TENSORFEED_RPC_URL="https://base-mainnet.g.alchemy.com/v2/YOUR_KEY"Affiliate links if you don't already have an account:
- Alchemy: https://www.alchemy.com/
- Infura: https://www.infura.io/
Tools
Generic Base reads
| Tool | Description |
|---|---|
balance | Native ETH balance for an address |
usdc_balance | USDC (Circle native bridged) balance for an address |
block_number | Latest Base block number |
get_tx_receipt | Full tx receipt with status, gas, and logs summary |
call | Read-only contract call (eth_call, never broadcasts) |
recent_transfers | USDC Transfer events involving an address over N blocks |
x402-native verification
| Tool | Description |
|---|---|
verify_x402_settlement | Given a tx hash, expected recipient, and expected USDC amount, returns a structured verdict on whether the on-chain Transfer event matches. |
parse_x402_manifest | Fetches https://{domain}/.well-known/x402.json, returns the structured manifest. |
usdc_recent_payments_to | USDC transfers TO an address over N blocks; the merchant-side view. |
probe_x402_endpoint | Probes any https URL and reports whether it returns a canonical x402-paid 402 response with accepts[]. |
decode_x402_payment_payload | Offline decode of a base64 X-PAYMENT header (Coinbase x402 V2): returns scheme, network, version, EIP-3009 authorization, signature. |
TensorFeed flavor
| Tool | Description |
|---|---|
verify_afta_federation | Calls TensorFeed's AFTA certification endpoint for a domain, returns a scored checklist. |
tf_payment_lookup | Checks whether a tx hash is a USDC payment to TensorFeed's canonical wallet on Base. |
x402_publisher_health | Returns current outcome + 24h/7d uptime + recent series for a domain monitored by TensorFeed's hourly x402 status probe. |
afta_federation_members | Returns the canonical curated list of confirmed AFTA federation members (TF origin + federated members). |
Examples
Verify an x402 settlement (works on TensorFeed's first canonical V2 payment):
verify_x402_settlement({tx_hash: "0xe20c57d8aa6df63f75ce7a4e4c0cab492eb7fa672a23cd8fd59967eb6b66bd67", expected_recipient: "0x549c82e6bFC54bdaE9A2073744CBC2AF5D1FC6D1", expected_amount_usdc: "0.02" }) // returns { ok: true, verified: true, matches: [...] }
Inspect a publisher's x402 manifest:
parse_x402_manifest({ domain: "tensorfeed.ai" })Check AFTA certification:
verify_afta_federation({ domain: "tensorfeed.ai" })Threat model
Read-only chain-visibility MCP. The full picture is in SECURITY.md; the short version:
- No private keys, no signing, no broadcasts. The server cannot move funds.
- Input validators on every tool reject malformed inputs (bad checksums, malformed hashes, URL-shaped domains, private/loopback hostnames).
- Output sanitization strips C0/C1 control characters and zero-width / direction-override marks from every string returned to the calling agent.
- External strings carry an
_origin: "external"marker so the calling agent knows the value came from a third party. - 50 KB response cap on serialized tool output; oversized responses collapse to a structured stub.
- RPC allowlist limits self-hosters to known endpoints; arbitrary URLs are rejected and fall back to public Base RPC.
- No telemetry, no phone-home, no analytics.
- Provenance: npm releases are published via GitHub Actions OIDC with cryptographic provenance attestations. Verify with
npm audit signatures.
Report security issues to security@tensorfeed.ai. Please do not file a public issue or CVE for an unfixed vulnerability.
License
MIT
Related
- Coinbase Base MCP - the official transact-side MCP for Base. Pair with this package for a full pay + verify loop: Base MCP signs the x402 payment, this package independently confirms the settlement on-chain.
- @tensorfeed/mcp-server - companion package, the TensorFeed data MCP (news, status, models, benchmarks, premium endpoints). Complementary role: this server verifies x402 payments on-chain; mcp-server wraps the TF data API as MCP tools.
- TensorFeed - AI ecosystem data layer
- TensorFeed developers - free + premium API for AI agents
- Agent Fair-Trade Agreement (AFTA) - open standard for honest agent commerce
- x402 spec - the payment protocol this MCP verifies