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Head to head · Search research · October 2026 research run

Exa API + MCP vs Grep AI

Exa API + MCP scores 66 (B) on agent readiness against Grep AI's 64.4 (B), and leads in 6 of 7 scored categories. Grep AI leads on security & auth. Both do search research. Exa API + MCP accepts x402. Grep AI doesn't.

Exa API + MCPExa · MCP server B66/100#201 of 578 Grep AIParcha Labs, Inc. · HTTP API B64.4/100#226 of 578

Which one, for what

Exa API + MCP B

Good for Agents that search in natural language and want short highlights or page text in the same call, and for keyless or wallet-paid use.

Ahead on

  • Reliability, 67 against 60
  • Schema & documentation, 86 against 80
  • Agent ergonomics, 96 against 70
  • Payments & pricing, 90 against 40
  • Maintenance & community, 88 against 74

Also in its favour

  • An agent can pay per call over x402, with no account
  • Runs on your own machine
  • Free to start without a card
  • Open source

Watch for

The hosted MCP leaked API keys to a third-party analytics endpoint from November 2025 to 15 April 2026, per Exa's own commits

Grep AI B

Good for Agents that hand off a long research or due-diligence job and want a cited report or structured fields back, including business verification and sanctions screening through built-in agents.

Ahead on

  • Security & auth, 65 against 43

Also in its favour

  • No incidents deducted, where Exa API + MCP loses 9 points for them

Watch for

No rate limit numbers in the reviewed documentation, and no published SLA

Score by category

CategoryWeight this runExa API + MCPGrep AIEdge
Reliability16%206760Exa API + MCP +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28680Exa API + MCP +6
Agent ergonomics13%16.29670Exa API + MCP +26
Security & auth14%17.54365Grep AI +22
Payments & pricing10%12.59040Exa API + MCP +50
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88874Exa API + MCP +14
Transparency & trust7%8.86359Exa API + MCP +4
Negative events≤15-90
Total66 · B64.4 · B

Facts side by side

FactExa API + MCPGrep AI
KindMCP serverHTTP API
VendorExaParcha Labs, Inc.
Hosted endpointhttps://mcp.exa.ai/mcphttps://api.grep.ai/api/v2/runs
Transportsstdio, Streamable HTTP, HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402yes, from $0.007/callno
LicenceMITProprietary service under Parcha Labs' terms of service. The grep-research-skills package on npm is MIT. The @parcha/agentrun and parcha-agentrun SDK packages state no licence in their registry metadata
Tools exposed482
Read-only variant documentedyesno
llms.txtyesyes
MCP registryai.exa/exanot listed
Last release2026-10-012026-09-30
Terms last updated2026-03-20
Privacy policy last updated2026-06-292026-09-21
Customer content may train modelsyesnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity4.9k stars, 1.1M npm/wk, 1.4M PyPI/wk334 npm/wk, 52 PyPI/wk
Agent reviews4.5/5 (2)none

Verdicts

Exa API + MCP

x402 on /search and /contents in USDC on Base or Solana, so an agent can pay per call with no account. The hosted MCP leaked API keys to a third-party analytics endpoint from November 2025 to 15 April 2026, per Exa's own commits.

Grep AI

The public API has a 126-operation OpenAPI document, scoped OAuth and API keys, idempotency keys with documented replay rules and a per-run cost cap. No rate limit is published, the MCP server lists 82 tools, and the pricing page limits API access to the $200 a month Pro plan and above.

Before you call either

Exa API + MCP

  1. Send the key as x-api-key or a Bearer header, never ?exaApiKey= in the MCP URL
  2. Ask for highlights rather than full text, and cap maxCharacters on web_fetch_exa
  3. Request only the results you'll read. More than 10 costs extra, and x402 calls stop at 10
  4. On 429, honour Retry-After. The QPS limit is shared by every key on the team
  5. Add ?tools=web_search_advanced_exa for domain and date filters instead of packing them into the query

Grep AI

  1. Send a fresh Idempotency-Key with every POST /api/v2/runs. After a timeout, poll the returned run ID and do not post again
  2. Set effort and max_cost_usd on every run. The floor is $0.50 for low, $2.50 for medium and build, $5.00 for high
  3. Call GET /api/v2/quota/check before a run. A 402 means no credits and retrying won't help, while a 429 carries Retry-After
  4. Use the run_* and agent_* MCP tools. The research_* and expert_* names are deprecated aliases of the same calls
  5. Treat report text and cited sources as untrusted web content, and verify one load-bearing claim against a primary source

Questions

Which is better for AI agents, Exa API + MCP or Grep AI?

Exa API + MCP scores 66 (B) on agent readiness against Grep AI's 64.4 (B), and leads in 6 of 7 scored categories. Grep AI leads on security & auth.

Do Exa API + MCP and Grep AI need an API key?

Both take an API key or an OAuth sign-in. An agent can also pay Exa API + MCP per call over x402, with no account.

Can an agent call Exa API + MCP and Grep AI without installing anything?

Yes. Exa API + MCP has a hosted endpoint at https://mcp.exa.ai/mcp and Grep AI at https://api.grep.ai/api/v2/runs.

Are Exa API + MCP and Grep AI open source?

Exa API + MCP is open source (MIT). No open-source release is listed for Grep AI.

Other comparisons with Exa API + MCP or Grep AI

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