# AgentIndex x402 (remote · x402.agentindex.world)

Pay-per-call web search, translation and research jobs for AI agents. USDC on Base, no account.

- Trust score: 66/100 (medium)
- Change this week: +6
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `x402.agentindex.world`: 66/100 (this document), [markdown](https://verifymcp.io/servers/world-agentindex-x402/x402.md), [page](https://verifymcp.io/servers/world-agentindex-x402/x402)

## Channel facts

- Endpoint: `https://x402.agentindex.world/mcp/`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 18 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1634 tokens (~90/item across 18 items; 18 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 50/100
  - Stability observed for 15 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
- **Tool Safety**: 75/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "can_pay" implies "pay" and declares no destructiveHint at all, which the MCP spec reads as destructive by default.
  - An AI judge read all 19 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the AgentIndex x402 MCP server?

AgentIndex x402 is a hosted endpoint at https://x402.agentindex.world/mcp/, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http world-agentindex-x402 'https://x402.agentindex.world/mcp/'
```

### Cursor

```json
{
  "mcpServers": {
    "world-agentindex-x402": {
      "url": "https://x402.agentindex.world/mcp/"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "world-agentindex-x402": {
      "type": "http",
      "url": "https://x402.agentindex.world/mcp/"
    }
  }
}
```

### Codex

```toml
[mcp_servers.world-agentindex-x402]
url = "https://x402.agentindex.world/mcp/"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "world-agentindex-x402": {
      "type": "remote",
      "url": "https://x402.agentindex.world/mcp/",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add world-agentindex-x402 --url 'https://x402.agentindex.world/mcp/' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  world-agentindex-x402:
    url: "https://x402.agentindex.world/mcp/"
```

### Netclaw

```json
{
  "McpServers": {
    "world-agentindex-x402": {
      "Transport": "http",
      "Url": "https://x402.agentindex.world/mcp/"
    }
  }
}
```

### Vellum

```bash
assistant mcp add world-agentindex-x402 -t streamable-http -u 'https://x402.agentindex.world/mcp/'
```

### Other

```json
{
  "mcpServers": {
    "world-agentindex-x402": {
      "type": "http",
      "url": "https://x402.agentindex.world/mcp/"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-20 (score 66, +4)

- [security regression] A breaking change shipped without a version bump: still 4.0.3
- [security regression] Tool “contact_kairos” was removed
- [security regression] Tool “coordination_thread_schema” was removed
- [security regression] Tool “coordination_thread_snapshot_schema” was removed
- [security regression] Tool “detect_language” was removed
- [security regression] Tool “digest_tool_result” was removed
- [security regression] Tool “discover_mcp_servers” was removed
- [security regression] Tool “discover_semantic” was removed
- [security regression] Tool “get_agent_trust_kit” was removed
- [security regression] Tool “get_welcome_salon” was removed
- [security regression] Tool “honest_delivery_refusal_schema” was removed
- [security regression] Tool “mesh_claim_bounty” was removed
- [security regression] Tool “mesh_ledger” was removed
- [security regression] Tool “mesh_list_bounties” was removed
- [security regression] Tool “mesh_list_nodes” was removed
- [security regression] Tool “mesh_post_bounty” was removed
- [security regression] Tool “mesh_register_node” was removed
- [security regression] Tool “poll_contact_kairos” was removed
- [security regression] Tool “relationship_memory_schema” was removed
- [security regression] Tool “return_visit_pledge_schema” was removed
- [security regression] Tool “tool_delivery_receipt_schema” was removed
- [security regression] Tool “validate_coordination_thread_snapshot” was removed
- [security regression] Tool “validate_coordination_thread_turn” was removed
- [security regression] Tool “validate_honest_delivery_refusal” was removed
- [security regression] Tool “validate_relationship_memory” was removed
- [security regression] Tool “validate_return_visit_pledge” was removed
- [security regression] Tool “validate_tool_delivery_receipt” was removed
- [security regression] Tool “verify_tool_result_digest” was removed
- [security] The server rewrote its instructions, which are the text every model session reads
- [functional regression] Schema quality: 73 → 90
- [functional] Stability: fail → 0.50
- [functional] Destructive annotations: pass → 0
- [functional] New tool “agent_health”
- [functional] New tool “can_pay”
- [functional] New tool “crypto”
- [functional] New tool “fact_check”
- [functional] New tool “gas_price”
- [functional] New tool “news”
- [functional] New tool “probe”
- [functional] New tool “search”
- [functional] New tool “wallet_balance”
- [functional] New tool “wallet_intelligence”
- [functional] New tool “weather”
- [functional] New tool “x402_echo”

### 2026-09-19 (score 62, +2)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “discover_semantic” rewrote its description, which is the text the model reads
- [functional improvement] Schema quality: 89 → 73
- [functional improvement] Tool coverage: 59% → 79%
- [functional] Schema quality: fair → good
- [functional] New tool “contact_kairos”
- [functional] New tool “coordination_thread_schema”
- [functional] New tool “coordination_thread_snapshot_schema”
- [functional] New tool “get_agent_trust_kit”
- [functional] New tool “get_welcome_salon”
- [functional] New tool “honest_delivery_refusal_schema”
- [functional] New tool “poll_contact_kairos”
- [functional] New tool “relationship_memory_schema”
- [functional] New tool “return_visit_pledge_schema”
- [functional] New tool “tool_delivery_receipt_schema”
- [functional] New tool “validate_coordination_thread_snapshot”
- [functional] New tool “validate_coordination_thread_turn”
- [functional] New tool “validate_honest_delivery_refusal”
- [functional] New tool “validate_relationship_memory”
- [functional] New tool “validate_return_visit_pledge”
- [functional] New tool “validate_tool_delivery_receipt”

### 2026-09-18 (score 60, −1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “discover_mcp_servers” rewrote its description, which is the text the model reads
- [functional improvement] Schema quality: 102 → 89
- [functional improvement] Tool coverage: 25% → 59%
- [functional] Schema quality: good → fair
- [functional] New tool “digest_tool_result”
- [functional] New tool “discover_semantic”
- [functional] New tool “mesh_claim_bounty”
- [functional] New tool “mesh_ledger”
- [functional] New tool “mesh_list_bounties”
- [functional] New tool “mesh_list_nodes”
- [functional] New tool “mesh_post_bounty”
- [functional] New tool “mesh_register_node”
- [functional] New tool “verify_tool_result_digest”

### 2026-09-17 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 0 to 3.

### 2026-09-12 (score 60, −1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [functional regression] Schema quality: 724 → 819
- [functional improvement] Tool coverage: 14% → 25%
- [functional] New tool “discover_mcp_servers”

### 2026-09-08 (score 61, −1)

- [security regression] Stability: 0.07 → fail
- [security regression] A breaking change shipped without a version bump: still 4.0.3
- [security regression] Tool “fact_check” was removed
- [security regression] Tool “search” was removed
- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “detect_language” rewrote its description, which is the text the model reads
- [security] Tool “extract_structured” rewrote its description, which is the text the model reads
- [security] Tool “read_pdf” rewrote its description, which is the text the model reads
- [security] Tool “read_web_page” rewrote its description, which is the text the model reads
- [security] Tool “summarize” rewrote its description, which is the text the model reads
- [functional improvement] Schema quality: 995 → 724

### 2026-09-07 (score 62, +1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “search” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 97 → 110
- [functional] First check of Tool coverage: 11
- [functional] New tool “detect_language”
- [functional] New tool “extract_structured”
- [functional] New tool “fact_check”
- [functional] New tool “read_pdf”
- [functional] New tool “read_web_page”
- [functional] New tool “summarize”

### 2026-09-06 (score 61, 0)

- [security] Tool “jobs” rewrote its description, which is the text the model reads
- [security] Tool “search” rewrote its description, which is the text the model reads
- [security] Tool “translate” rewrote its description, which is the text the model reads
- [functional improvement] Stability: unverified → 0.03

## MCP tools (18)

### `search` (~167 tokens)

Search

Real-time web search and content retrieval - up to 10 results with title, URL, snippet and publish date, plus clean full-page Markdown for the top 3 results by default and an optional short summary. Also accepts up to 5 queries in one call, merged and de-duplicated - one call instead of five. No account, no API key, no quota. Try GET /search/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.

Input parameters:

- `content_chars` (integer)
- `content_results` (integer)
- `extract` (boolean)
- `include_content` (boolean)
- `max_results` (integer)
- `query` (required)
- `summarize` (boolean)

### `translate` (~122 tokens)

Translate

Translate up to 200 text segments in a single call - the same result that would otherwise take 200 separate calls to translate a whole file. Markdown, HTML and {x} placeholders preserved per segment, order and count kept intact, source language auto-detected, automatic fallback across multiple models for uptime, providers that train on submitted prompts excluded. A single string also works. No account, no API key. Try GET /translate/sample.

Input parameters:

- `preserve_format` (boolean)
- `source_lang`
- `target_lang` (string, required)
- `text` (required)

### `jobs` (~59 tokens)

Jobs

Multi-query web research, read and synthesized into one sourced JSON brief in a single call - what would otherwise cost an agent twenty calls and its whole context window. Free status polling and result retrieval. Try GET /jobs/sample.

Input parameters:

- `subject` (string, required)

### `read_pdf` (~94 tokens)

Read Pdf

Extract a public PDF (by HTTPS URL or base64) into clean markdown text, plus title/author/page count/date metadata and a real token count. Deterministic text extraction, no model involved. Try GET /pdf/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.

Input parameters:

- `pdf_base64`
- `url`

### `read_web_page` (~98 tokens)

Read Web Page

Fetch a URL and return its main article as clean markdown - navigation, ads and boilerplate stripped, links resolved, plus a real token count. The same extraction /search uses on result pages, exposed standalone for a URL you already have. Try GET /web-read/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.

Input parameters:

- `url` (string, required)

### `extract_structured` (~104 tokens)

Extract Structured

Extract structured data from a URL or raw text into strict JSON matching a schema you provide. Fields the content doesn't support come back null - never an invented or approximate value, and an unmatchable schema returns an explicit error. Try GET /extract/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.

Input parameters:

- `schema` (object, required)
- `text`
- `url`

### `summarize` (~99 tokens)

Summarize

Summarize a URL, raw text or HTML at the length you request - short, medium or long - with the source noted. Neutral and factual, no invented facts. Try GET /summarize/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.

Input parameters:

- `html`
- `length` (string)
- `text`
- `url`

### `fact_check` (~98 tokens)

Fact Check

Check a claim against live web sources - a verdict, a confidence level, and the sources that support or contradict it, each with its URL and stance. Returns 'inconclusive' rather than a guess when the sources don't clearly settle it. Try GET /fact-check/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.

Input parameters:

- `claim` (string, required)

### `weather` (~59 tokens)

Weather

Current weather and a 3-day forecast for any city or lat/lon - temperature, humidity, wind, conditions. No account, no API key. Try GET /weather/sample.

Input parameters:

- `city`
- `lat`
- `lon`

### `crypto` (~62 tokens)

Crypto

Live spot prices for crypto coins (BTC, ETH, SOL, ...) in USD or another fiat, with 24h change. Accepts tickers or CoinGecko ids. Try GET /crypto/sample.

Input parameters:

- `coins` (required)
- `vs_currency` (string)

### `news` (~47 tokens)

News

Top Hacker News headlines right now - title, URL, score, comments. Fresh links for agents that need current tech/startup signal. Try GET /news/sample.

Input parameters:

- `limit` (integer)

### `can_pay` (~67 tokens)

Can Pay

Check whether a Base wallet holds enough USDC to pay an x402 amount (default $0.001). Returns balance, can_pay, shortfall. The checklist agents run before spending. Try GET /can-pay/sample.

Input parameters:

- `address` (string, required)
- `amount` (number)

### `probe` (~58 tokens)

Probe

Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.

Input parameters:

- `method` (string)
- `url` (string, required)

### `wallet_balance` (~69 tokens)

Wallet Balance

Read native coin and USDC balances for any EVM wallet on Base, Ethereum, Polygon, Arbitrum or Optimism, with atomic amounts and current block. No RPC key or account. Try GET /wallet-balance/sample.

Input parameters:

- `address` (string, required)
- `network` (string)

### `gas_price` (~60 tokens)

Gas Price

Read the live gas price, EIP-1559 base fee and estimated native-transfer cost on Base, Ethereum, Polygon, Arbitrum or Optimism. No RPC key or account. Try GET /gas-price/sample.

Input parameters:

- `network` (string)

### `wallet_intelligence` (~87 tokens)

Wallet Intelligence

One call replaces wallet-balance and gas reads across Base, Ethereum, Polygon, Arbitrum and Optimism. Returns native and USDC balances, current blocks, fees and Base x402 payment readiness. One signature instead of ten paid requests. Try GET /wallet-intelligence/sample.

Input parameters:

- `address` (string, required)
- `amount_usdc` (number)
- `networks`

### `x402_echo` (~76 tokens)

X402 Echo

Cheapest possible Base-mainnet x402 conformance call: settle exactly one atomic unit of USDC ($0.000001) and receive payer identity, request echo and receipt. Built for agents testing wallets, Payment-Signature, facilitators and settlement. Try GET /x402-echo/sample.

Input parameters:

- `message` (string)

### `agent_health` (~78 tokens)

Agent Health

Fresh operational audit of any public agent or paid API: reachability, latency, HTTP status, x402 challenge, price/network/payTo, OpenAPI, agent card and MCP manifest. Returns a 0-100 score, verdict and issues. Try GET /agent-health/sample.

Input parameters:

- `method` (string)
- `url` (string, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/world-agentindex-x402/x402#diagnostics

## Score history

- 2026-09-20: 66
- 2026-09-19: 62
- 2026-09-18: 60
- 2026-09-17: 61
- 2026-09-16: 60
- 2026-09-15: 60
- 2026-09-14: 60
- 2026-09-13: 60
- 2026-09-12: 60
- 2026-09-11: 61
- 2026-09-10: 61
- 2026-09-09: 61
- 2026-09-08: 61
- 2026-09-07: 62
- 2026-09-06: 61
- 2026-09-05: 61

## Common questions

### What is the AgentIndex x402 MCP server?

AgentIndex x402 is an MCP server listed in the public MCP registry as world.agentindex/x402. Pay-per-call web search, translation and research jobs for AI agents. USDC on Base, no account. This page covers its hosted endpoint (https://x402.agentindex.world/mcp/).

### Is the AgentIndex x402 MCP server safe to use?

AgentIndex x402 scores 66 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the AgentIndex x402 MCP server expose?

AgentIndex x402 exposes 18 tools: search, translate, jobs, read_pdf, read_web_page, and 13 more. Their descriptions and schemas cost roughly 1,504 tokens of context every time the server is loaded.

### Does the AgentIndex x402 MCP server require authentication?

No. We connected to AgentIndex x402 without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the AgentIndex x402 MCP server still maintained?

AgentIndex x402 is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://x402.agentindex.world/mcp/
- Website: https://x402.agentindex.world/openapi.json
- Changelog RSS feed: https://verifymcp.io/servers/world-agentindex-x402/x402.xml
- Changelog JSON feed: https://verifymcp.io/servers/world-agentindex-x402/x402.json
- HTML version of this page: https://verifymcp.io/servers/world-agentindex-x402/x402