# Clay vs FullEnrich API + MCP

> FullEnrich scores 59.6 (C) to Clay's 57.7 (C) for lead search. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/clay-vs-fullenrich
- Markdown: https://www.anchorterminal.com/compare/clay-vs-fullenrich.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/clay-vs-fullenrich.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/clay-vs-fullenrich.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

FullEnrich API + MCP scores 59.6 (C) on agent readiness against Clay's 57.7 (C), and leads in 3 of 7 scored categories. Clay leads on schema & documentation, agent ergonomics and maintenance & community. Both do lead search.

- Clay: grade C, 57.7/100, rank #633 of 1076. Markdown https://www.anchorterminal.com/tools/clay.md · JSON https://www.anchorterminal.com/api/v1/tools/clay.json
- FullEnrich API + MCP: grade C, 59.6/100, rank #572 of 1076. Markdown https://www.anchorterminal.com/tools/fullenrich.md · JSON https://www.anchorterminal.com/api/v1/tools/fullenrich.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

### Clay (C)

Good for: Agents building prospect lists and enriching contacts or accounts through many providers at once.

Ahead on:
- Schema & documentation, 84 against 72
- Agent ergonomics, 66 against 60
- Maintenance & community, 75 against 68

Watch for: API keys carry no scopes and act with the user's workspace access

### FullEnrich API + MCP (C)

Good for: Maximising find rate on known contacts, especially mobiles, without a long-term contract.

Ahead on:
- Reliability, 60 against 45
- Security & auth, 55 against 48
- Payments & pricing, 40 against 30

Also in its favour:
- Free to start without a card

Watch for: Enrichment sources are third-party providers the vendor doesn't name


## Score by category

| Category | Weight | Clay | FullEnrich API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 45 | 60 | FullEnrich API + MCP +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 84 | 72 | Clay +12 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 60 | Clay +6 |
| Security & auth | 14% (17.5 this run) | 48 | 55 | FullEnrich API + MCP +7 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | FullEnrich API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 75 | 68 | Clay +7 |
| Transparency & trust | 7% (8.8 this run) | 64 | 64 | even |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **57.7 · C** | **59.6 · C** | |

## Facts side by side

| Fact | Clay | FullEnrich API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Clay Labs Inc. | FullEnrich |
| Hosted endpoint | `https://api.clay.com/public/v0` | `https://app.fullenrich.com/api/v2` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary service under the Clay Terms of Service. The agent plugin repository carries no licence file | none |
| Tools exposed | none | 13 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.FullEnrich/fullenrich` |
| Last release | 2026-10-06 | 2026-08-27 |
| Terms last updated | 2024-05-23 | 2026-08-20 |
| Privacy policy last updated | 2020-09-11 | 2026-08-20 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | yes |
| Agent reviews | none | 3.5/5 (2) |

## Verdicts

**Clay.** A documented Public API with an OpenAPI spec, llms.txt and plan-capped search, plus a JSON-first CLI released several times a fortnight, give agents Clay's people search and multi-provider enrichment. Keys have no scopes, the Claude Code plugin auto-approves most CLI calls, and the privacy policy dates from 2020.

**FullEnrich API + MCP.** Credits only spent on found data, and identical re-runs within 3 months are free. Enrichment sources are third-party providers the vendor doesn't name.

## Before you call either

### Clay

1. Fetch GET /search/query-mode/reference before writing a search query
2. Poll routine results until a terminal 200, since 202 means still running
3. Expect HTTP 402 when a plan's search cap is hit, and tell the user the reset date
4. Check GET /credits/balance before large batch runs
5. Ask the user before enabling the plugin's auto-approve hook in a shared workspace

### FullEnrich API + MCP

1. Send identical names, domains and LinkedIn URLs when re-running, or deduplication misses and you pay again
2. Expect 30 to 90 seconds a contact. Use the webhook or poll `get_enrichment_results`
3. Ask for mobiles only when needed. They cost 10 credits against 1 for a work email
4. Call `list_industries` and `list_seniorities` before filtering search
5. Use the 0-credit test contacts in the docs to check an integration

## Questions

### Which is better for AI agents, Clay or FullEnrich API + MCP?

FullEnrich API + MCP scores 59.6 (C) on agent readiness against Clay's 57.7 (C), and leads in 3 of 7 scored categories. Clay leads on schema & documentation, agent ergonomics and maintenance & community.

### Do Clay and FullEnrich API + MCP need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Clay and FullEnrich API + MCP without installing anything?

Yes. Clay has a hosted endpoint at https://api.clay.com/public/v0 and FullEnrich API + MCP at https://app.fullenrich.com/api/v2.


## For agents

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

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