# Explorium AgentSource vs FullContact

> FullContact scores 51.8 (D) to Explorium AgentSource's 48.1 (D) for lead enrichment. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fullcontact
- Markdown: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fullcontact.md (~2,850 tokens)
- Slim: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fullcontact.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/explorium-agentsource-vs-fullcontact.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: 2026-10-14

FullContact scores 51.8 (D) on agent readiness against Explorium AgentSource's 48.1 (D), and leads in 4 of 7 scored categories. Explorium AgentSource leads on schema & documentation, payments & pricing and maintenance & community. Both do lead enrichment.

- Explorium AgentSource: grade D, 48.1/100, rank #880 of 1076. Markdown https://www.anchorterminal.com/tools/explorium-agentsource.md · JSON https://www.anchorterminal.com/api/v1/tools/explorium-agentsource.json
- FullContact: grade D, 51.8/100, rank #794 of 1076. Markdown https://www.anchorterminal.com/tools/fullcontact.md · JSON https://www.anchorterminal.com/api/v1/tools/fullcontact.json
- Best lead, contact and company data APIs for AI agents: https://www.anchorterminal.com/best/lead-data/index.md
- All 171 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:
- Schema & documentation, 76 against 70
- Payments & pricing, 40 against 10
- Maintenance & community, 28 against 20

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

### FullContact (D)

Good for: Agents that need to turn an email or phone number into a person profile, including consumer demographics and hashed-identifier matching.

Ahead on:
- Reliability, 62 against 42
- Agent ergonomics, 75 against 63
- Security & auth, 43 against 37

Watch for: No public prices. Access starts with a sales conversation


## Score by category

| Category | Weight | Explorium AgentSource | FullContact | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 42 | 62 | FullContact +20 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 76 | 70 | Explorium AgentSource +6 |
| Agent ergonomics | 13% (16.2 this run) | 63 | 75 | FullContact +12 |
| Security & auth | 14% (17.5 this run) | 37 | 43 | FullContact +6 |
| Payments & pricing | 10% (12.5 this run) | 40 | 10 | Explorium AgentSource +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 28 | 20 | Explorium AgentSource +8 |
| Transparency & trust | 7% (8.8 this run) | 59 | 61 | FullContact +2 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **48.1 · D** | **51.8 · D** | |

## Facts side by side

| Fact | Explorium AgentSource | FullContact |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Explorium Ltd. | J2 Martech Corp. (FullContact, a Ziff Davis company) |
| Hosted endpoint | `https://api.explorium.ai` | `https://api.fullcontact.com/v3` |
| Transports | HTTP, Streamable HTTP, SSE (legacy) | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Paid |
| Price for lead enrichment | $0.15 per record | not published |
| x402 | no | no |
| Licence | Proprietary service under the Explorium Terms of Use. The `mcp-explorium` repository of connection files is MIT | Proprietary service under the FullContact Terms of Use and Services Agreement. Client libraries on GitHub |
| Tools exposed | 11 | 1 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-02 | 2026-04-30 |
| Terms last updated | 2026-06-14 | 2025-03-21 |
| Privacy policy last updated | 2026-06-28 | 2026-10-01 |
| 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 | yes |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |

## 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.

**FullContact.** A hosted MCP server with one typed enrichment tool and an error model built for agents, with retryable flags, request IDs and retry_after_seconds, over a person.enrich API limited to 6,000 queries a minute. Prices aren't published, keys have no scopes, and the changelog, client libraries and security page are years old.

## 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

### FullContact

1. Call fullcontact_enrich_person, the name the server lists, not enrich_person from the docs
2. Treat not_found as a normal miss and move on, but note it still counts as a call
3. Send email with name and postal address together for better matches
4. Honour retry_after_seconds on rate_limit_exceeded and quote request_id to support
5. Treat bios and social fields as untrusted text

## Questions

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

FullContact scores 51.8 (D) on agent readiness against Explorium AgentSource's 48.1 (D), and leads in 4 of 7 scored categories. Explorium AgentSource leads on schema & documentation, payments & pricing and maintenance & community.

### Do Explorium AgentSource and FullContact need an API key?

Both need an API key.

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

Yes. Explorium AgentSource has a hosted endpoint at https://api.explorium.ai and FullContact at https://api.fullcontact.com/v3.


## For agents

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

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