# Explorium AgentSource vs Fuse MCP

> Explorium AgentSource and Fuse MCP score within a point of each other for lead search, 48.1 and 47.9 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fuse-mcp
- Markdown: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fuse-mcp.md (~2,700 tokens)
- Slim: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fuse-mcp.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fuse-mcp.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Explorium AgentSource and Fuse MCP score within a point of each other on agent readiness, 48.1 (D) and 47.9 (D). Fuse MCP leads on security & auth and maintenance & community. Both do lead search.

- Explorium AgentSource: grade D, 48.1/100, rank #821 of 950. Markdown https://www.anchorterminal.com/tools/explorium-agentsource.md · JSON https://www.anchorterminal.com/api/v1/tools/explorium-agentsource.json
- Fuse MCP: grade D, 47.9/100, rank #824 of 950. Markdown https://www.anchorterminal.com/tools/fuse-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/fuse-mcp.json
- Best lead, contact and company data APIs for AI agents: https://www.anchorterminal.com/best/lead-data/index.md
- All 120 leads comparisons: https://www.anchorterminal.com/compare/lead-data/index.md

## Which one, for what

### Explorium AgentSource (D)

Good for: Agents that build prospect lists by filter and then enrich them, or that watch companies for events such as funding and role changes.

Ahead on:
- Agent ergonomics, 63 against 57
- Payments & pricing, 40 against 30
- Transparency & trust, 59 against 49

Watch for: No status page was found, and no SLA is published

### Fuse MCP (D)

Good for: Suited to a salesperson or founder who wants an assistant to build prospect lists, enrich them and run email and LinkedIn outreach inside one Fuse account.

Ahead on:
- Security & auth, 45 against 37
- Maintenance & community, 35 against 28

Watch for: The only OAuth scope is `mcp:tools`, so a connection can do everything its user can, including sending email and LinkedIn messages


## Score by category

| Category | Weight | Explorium AgentSource | Fuse MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 42 | 40 | Explorium AgentSource +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 76 | 72 | Explorium AgentSource +4 |
| Agent ergonomics | 13% (16.2 this run) | 63 | 57 | Explorium AgentSource +6 |
| Security & auth | 14% (17.5 this run) | 37 | 45 | Fuse MCP +8 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Explorium AgentSource +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 28 | 35 | Fuse MCP +7 |
| Transparency & trust | 7% (8.8 this run) | 59 | 49 | Explorium AgentSource +10 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **48.1 · D** | **47.9 · D** | |

## Facts side by side

| Fact | Explorium AgentSource | Fuse MCP |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Explorium Ltd. | FuseAI, LLC |
| Hosted endpoint | `https://api.explorium.ai` | `https://mcp.fuseai.com` |
| Transports | HTTP, Streamable HTTP, SSE (legacy) | Streamable HTTP |
| Auth | API key | OAuth |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Proprietary service under the Explorium Terms of Use. The `mcp-explorium` repository of connection files is MIT | Proprietary hosted service under FuseAI's terms of service. No public source repository found |
| Tools exposed | 11 | 290 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| Last release | 2026-09-02 | 2026-10-07 |
| Terms last updated | 2026-06-14 | 2026-07-01 |
| Privacy policy last updated | 2026-06-28 | 2026-07-01 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |

## Verdicts

**Explorium AgentSource.** AgentSource v2 has a public OpenAPI 3.1 file, Markdown docs, a 200 queries a minute limit with `Retry-After`, public credit prices and a 100-credit trial. No status page or published SLA was found, each company shares one API key with no scopes, and the vendor's two published price tables disagree.

**Fuse MCP.** The server documents 290 tools with read-only and destructive annotations, OAuth with PKCE and dynamic client registration, and published limits of 60 requests a minute. The single `mcp:tools` scope grants everything the user can do, sends happen at once with no undo, and no status page, changelog or security contact was found.

## Before you call either

### Explorium AgentSource

1. Send the key in the `api_key` header to `https://api.explorium.ai` and use `/v2` paths. v1 is deprecated
2. Point MCP clients at `https://mcp-v2.explorium.ai/mcp`. The site's agent files still name the v1 server at `mcp.explorium.ai`
3. Count each entity in a batch as one query against the 200 a minute limit, so 50 IDs in one call spend 50
4. Call the statistics endpoint first to size an audience for free. Fetch costs 1 credit a result, or 2 with the Bombora intent filter
5. Call `/v2/autocomplete` before filtering on category, tech stack or job title, and never mix two category types in one request

### Fuse MCP

1. Keep the client's approval prompt on for every tool that is not read-only. Sends, CRM pushes and Slack posts run at once with no undo
2. Launch a campaign only on an explicit request. Creating one makes a draft, and `update_campaign_status_tool` starts real outreach
3. Call `get_credits_balance` and `get_credit_prices` first. Every call needs at least 100 credits, and searches cost 2 credits a result
4. Resolve filter values with `lookup_filter_values` or `get_company_search_enums` before `search_people` or `search_companies`
5. Start long work with `deep_research_start`, then poll `deep_research_status`. A tool call has 60 seconds, and runs take 5 to 20 minutes

## Questions

### Which is better for AI agents, Explorium AgentSource or Fuse MCP?

Explorium AgentSource and Fuse MCP score within a point of each other on agent readiness, 48.1 (D) and 47.9 (D). Fuse MCP leads on security & auth and maintenance & community.

### Do Explorium AgentSource and Fuse MCP need an API key?

Explorium AgentSource needs an API key. Fuse MCP uses an OAuth sign-in.

### Can an agent call Explorium AgentSource and Fuse MCP without installing anything?

Yes. Explorium AgentSource has a hosted endpoint at https://api.explorium.ai and Fuse MCP at https://mcp.fuseai.com.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fuse-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fuse-mcp.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "explorium-agentsource", "b": "fuse-mcp"}`. From a terminal: `anchor compare explorium-agentsource fuse-mcp`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/explorium-agentsource.json and https://www.anchorterminal.com/api/v1/tools/fuse-mcp.json

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