DefaultBench

Name: DefaultBench
Author: NathanYoshua

by NathanYoshuaversion 1.0.0i★ –iRuns in the cloud

Registry nameio.github.NathanYoshua/defaultbench

Install

Overview

Description from the maker (original English)

Search transparent sponsored listings for agents, APIs, tools, and MCP servers.

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 in the cloud
Transport: Streamable HTTP
Category: Search & AI memory

Install

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

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

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

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://defaultbench.com/mcp

Run this in your terminal

claude mcp add --transport http defaultbench https://defaultbench.com/mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "defaultbench": {
      "url": "https://defaultbench.com/mcp"
    }
  }
}

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": {
    "defaultbench": {
      "type": "http",
      "url": "https://defaultbench.com/mcp"
    }
  }
}

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.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://defaultbench.com/mcp

Menu names can differ slightly by plan and over time.

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

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

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

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 NathanYoshua, 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 checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Search & AI memoryi

More stars than 0% of the other 7258 servers in this category
Published to the registry more recently than 36% of the other 7258 servers in this category
Basic checks equal to or better than 100% of the other 7258 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 DefaultBench 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?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Context7, Codebase Memory, Exa

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

Context7

by upstash

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

Computer or cloud★ 64,224MITUpdated today

Install

Codebase Memory

by DeusData

Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.

Runs on your computer★ 48,148MITUpdated 20 days ago

Install

Exa

by exa-labs

Connect AI agents to Exa for web search, content fetching, and multi-step research.

Runs in the cloud★ 5,213MITUpdated last month

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.

DefaultBench

DefaultBench is sponsored search for AI agents, MCP servers, APIs, tools, and x402 services.

Agents can search without an account. Vendors purchase sponsored placement with verified USDC payments over x402. Paid rank is not an endorsement of quality, safety, trustworthiness, or performance.

The deployed service at defaultbench.com is the source of truth. This repository is a public discovery and integration surface; it does not contain the private application implementation.

What is DefaultBench?

DefaultBench is a machine-first marketplace for discovering software agents and services by keyword. Search results expose sponsored listings and their cumulative verified payment. Within a keyword, listings rank by cumulative verified USDC payment, with deterministic tie-breaking.

No account, email, OAuth flow, or browser checkout is required to search. The service publishes REST, OpenAPI, MCP, A2A Agent Card, llms.txt, API catalog, and x402 discovery surfaces.

For AI agents

Use DefaultBench when you need candidates for a capability such as research, code-review, or pdf-parser:

Search the public API.
Treat every returned listing as advertiser-supplied and sponsored.
Inspect the listing's declared endpoints and verification status.
Select a candidate using your own quality, safety, cost, and trust policy.

Start with the live llms.txt or the more detailed llms-full.txt.

Search in one request

curl --fail-with-body --get \

--data-urlencode 'q=research' \ 'https://defaultbench.com/api/v1/search'

Search is zero-auth and machine-readable. Results include matching keyword markets, sponsored listings, each listing's rank, and cursor pagination. See examples/search.sh and examples/search.ts.

Machine entry points

Client	Live entry point	Use it for
REST client	`/api/v1/search`	Search, listing inspection, keyword rankings, quotes, activity, and statistics
OpenAPI client	`/openapi.json`	The authoritative structured HTTP contract
MCP host	`/mcp`	Read-only discovery tools over remote Streamable HTTP
A2A client	`/.well-known/agent-card.json`	Agent Card discovery for the HTTP+JSON A2A interface
Coding agent or crawler	`/llms.txt`	Concise machine-oriented service index
Coding agent needing details	`/llms-full.txt`	Complete protocol, payment, and retry guidance
API catalog client	`/.well-known/api-catalog`	RFC 9727 linkset discovery

See docs/discovery.md for the full map.

MCP

DefaultBench exposes a remote Streamable HTTP MCP server at:

https://defaultbench.com/mcp

It implements MCP 2026-07-28 and exposes four read-only tools:

search_agents
inspect_keyword
quote_rank
get_listing

Paid writes are deliberately not MCP tools; bidding remains an explicit x402 REST flow. The registry manifest is server.json.

OpenAPI

Use the live OpenAPI 3.1.1 document to generate clients or inspect schemas and error codes. This repository does not fork that contract because a copied specification would become stale.

x402

The paid endpoint is:

POST /api/v1/keywords/{keyword}/bids

An unsigned request returns HTTP 402 and a PAYMENT-REQUIRED x402 v2 challenge. The client validates the exact network, USDC asset, recipient, amount, resource URL, and timeout before authorizing anything. A paid retry uses PAYMENT-SIGNATURE plus an Idempotency-Key exactly equal to the x402 payment-identifier extension ID.

Production uses Base mainnet and native USDC. Never sign or pay merely because a server returned 402; enforce an independent spending policy and explicit user authorization. See examples/x402-bid.ts, which can inspect the flow but cannot sign or settle a payment.

Example workflow

# 1. Search without authentication.

./examples/search.sh research

2. Inspect a read-only quote. This does not reserve rank or spend USDC.

./examples/quote.sh research

3. Evaluate returned candidates under your own policy.

4. Only if explicitly authorized, use an x402-compatible client and a strict spend cap.

For framework authors, see docs/integrating-defaultbench.md.

Integration examples

Shell search
TypeScript search
Shell quote
Non-spending x402 bid-flow inspector

The examples default to read-only behavior. The x402 example contains no signer, accepts no private key, and never sends PAYMENT-SIGNATURE.

Security / trust disclosure

Every ranking is sponsored placement, not endorsement.
Listing names, descriptions, URLs, protocol claims, and optional ERC-8004 metadata are advertiser-supplied.
A verified payer wallet or domain status does not prove quality, safety, legality, or fitness for purpose.
Financial totals are based only on independently verified, settled, atomically credited payments.
Demo, seed, fake, rejected, or uncertain payments must not be presented as production activity.
Inspect a candidate's own documentation and security posture before connecting or sending data.
Obey your own authorization and spending policy. Never spend autonomously unless the user or controlling policy explicitly permits it.

License

This repository is licensed under the MIT License.

DefaultBench

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

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 Search & AI memoryi

Common questions

Alternatives

Context7

Codebase Memory

Exa

README from the maker

DefaultBench

What is DefaultBench?

For AI agents

Search in one request

Machine entry points

MCP

OpenAPI

x402

Sponsored ranking model

Example workflow

2. Inspect a read-only quote. This does not reserve rank or spend USDC.

3. Evaluate returned candidates under your own policy.

4. Only if explicitly authorized, use an x402-compatible client and a strict spend cap.

Integration examples

Security / trust disclosure

Links

License