AgentIndex x402
connectsx402.agentindex.world
Pay-per-call web search, translation and research jobs for AI agents. USDC on Base, no account.
https://x402.agentindex.world/mcp/WebsiteNo authMCP 2025-11-25v1.2.0last checked 21 Oct 2026spoke MCP on 98.9% of 88 checks (30 days)initialize in 338 msWill my client connect?
Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.
✓Claude CodeConnects
The endpoint answers an anonymous handshake, so no credential is needed.
claude mcp add --transport http agentindex-x402 https://x402.agentindex.world/mcp/Claude Code docs · read on 2026-08-30
✓Claude (claude.ai & Desktop)Connects
The endpoint answers an anonymous handshake, so no credential is needed.
Settings → Connectors → Add custom connector, then paste https://x402.agentindex.world/mcp/.
Claude (claude.ai & Desktop) docs · read on 2026-08-30
✓ChatGPTConnects
The endpoint answers an anonymous handshake, so no credential is needed.
Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://x402.agentindex.world/mcp/.
ChatGPT docs · read on 2026-08-30
✓CursorConnects
The endpoint answers an anonymous handshake, so no credential is needed.
{
"mcpServers": {
"agentindex-x402": {
"url": "https://x402.agentindex.world/mcp/"
}
}
}Cursor docs · read on 2026-08-30
✓VS Code (Copilot)Connects
The endpoint answers an anonymous handshake, so no credential is needed.
{
"servers": {
"agentindex-x402": {
"type": "http",
"url": "https://x402.agentindex.world/mcp/"
}
}
}VS Code (Copilot) docs · read on 2026-08-30
How to authenticate
Checked against the endpoint by our probe on 21 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.
| Scheme | No auth |
|---|---|
| Protected-resource metadata | ✕Not found Without it a client has to guess where the authorization server lives. |
| Anonymous access | Handshake succeeds; 143 tools listable |
What the probe found
A cross-origin preflight came back without Access-Control-Allow-Origin, so the endpoint is reachable from native clients only — code running in a web page is stopped by the browser before a request is ever sent.
Tools
Contract history
Breaking: token_risk
Breaking: list_agent_cards, publish_agent_card
Instructions rewritten: fact_check. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: fact_check. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: ask_model. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: base_estimate-gas. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: llm_gpt_mini. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: ask_model, search. The description an agent follows changed; the callable contract may not have.
Breaking: research
Instructions rewritten: ask_model, search. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: read_web_page, search. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: search. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: x402_echo. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: read_pdf. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: search. The description an agent follows changed; the callable contract may not have.
Breaking: contact_kairos, coordination_thread_schema, coordination_thread_snapshot_schema, detect_language, digest_tool_result, discover_mcp_servers, discover_semantic, get_agent_trust_kit, get_welcome_salon, honest_delivery_refusal_schema, mesh_claim_bounty, mesh_ledger, mesh_list_bounties, mesh_list_nodes, mesh_post_bounty, mesh_register_node, poll_contact_kairos, relationship_memory_schema, return_visit_pledge_schema, tool_delivery_receipt_schema, validate_coordination_thread_snapshot, validate_coordination_thread_turn, validate_honest_delivery_refusal, validate_relationship_memory, validate_return_visit_pledge, validate_tool_delivery_receipt, verify_tool_result_digest
Instructions rewritten: discover_semantic. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: discover_mcp_servers, discover_semantic. The description an agent follows changed; the callable contract may not have.
Breaking: fact_check, search
Instructions rewritten: detect_language, extract_structured, read_pdf, read_web_page, summarize. The description an agent follows changed; the callable contract may not have.
Instructions rewritten: search. The description an agent follows changed; the callable contract may not have.
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Status badge
Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.
[](https://mcpi.app/servers/agentindex-x402)