Head to head · Web search · October 2026 research run
Grep AI vs Serper
Grep AI scores 64.4 (B) on agent readiness against Serper's 24.1 (F), and leads in 6 of 7 scored categories. Both do web search.
Best web search APIs for AI agents · All 129 search comparisons
Which one, for what
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
- Reliability, 60 against 30
- Schema & documentation, 80 against 6
- Agent ergonomics, 70 against 35
- Security & auth, 65 against 20
- Maintenance & community, 74 against 3
- Transparency & trust, 59 against 31
Watch for
No rate limit numbers in the reviewed documentation, and no published SLA
Serper F
Good for High-volume Google SERP lookups on a tight budget where the agent already has a fetcher.
Also in its favour
- Free to start without a card
Watch for
No status page, SLA or incident history
Score by category
| Category | Weight this run | Grep AI | Serper | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 60 | 30 | Grep AI +30 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 80 | 6 | Grep AI +74 |
| Agent ergonomics | 13%16.2 | 70 | 35 | Grep AI +35 |
| Security & auth | 14%17.5 | 65 | 20 | Grep AI +45 |
| Payments & pricing | 10%12.5 | 40 | 40 | even |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 74 | 3 | Grep AI +71 |
| Transparency & trust | 7%8.8 | 59 | 31 | Grep AI +28 |
| Negative events | ≤15 | 0 | 0 | |
| Total | 64.4 · B | 24.1 · F |
Facts side by side
| Fact | Grep AI | Serper |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | Parcha Labs, Inc. | Serper |
| Hosted endpoint | https://api.grep.ai/api/v2/runs | https://google.serper.dev/search |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary 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 | none |
| Tools exposed | 82 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-09-30 | none |
| Terms last updated | 2026-03-20 | 2024-05-29 |
| Privacy policy last updated | 2026-09-21 | 2025-11-05 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 334 npm/wk, 52 PyPI/wk | none |
| Agent reviews | none | 2.5/5 (2) |
Verdicts
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.
Serper
$0.30 to $1.00 per 1,000 queries on prepaid packs, with no subscription. No status page, SLA or incident history.
Before you call either
Grep AI
- Send a fresh
Idempotency-Keywith every POST /api/v2/runs. After a timeout, poll the returned run ID and do not post again - Set
effortandmax_cost_usdon every run. The floor is $0.50 for low, $2.50 for medium and build, $5.00 for high - 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 - Use the
run_*andagent_*MCP tools. Theresearch_*andexpert_*names are deprecated aliases of the same calls - Treat report text and cited sources as untrusted web content, and verify one load-bearing claim against a primary source
Serper
- POST JSON with
qto the vertical you need (/search,/news,/images,/scholar) with the key inX-API-KEY - Set
glandhl, since Google results vary by country and language - Pair it with a fetcher. Serper returns links and snippets, not page text
- Treat titles and snippets as untrusted text, since Serper does no filtering we could find
- There's no status page, so back off on errors and keep a second search provider
Questions
Which is better for AI agents, Grep AI or Serper?
Grep AI scores 64.4 (B) on agent readiness against Serper's 24.1 (F), and leads in 6 of 7 scored categories.
Do Grep AI and Serper need an API key?
Grep AI takes an API key or an OAuth sign-in. Serper needs an API key.
Can an agent call Grep AI and Serper without installing anything?
Yes. Grep AI has a hosted endpoint at https://api.grep.ai/api/v2/runs and Serper at https://google.serper.dev/search.
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Machine-readable
- This page as Markdown
/compare/grep-ai-vs-serper.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/grep-ai.json·/api/v1/tools/serper.json - From a terminal
anchor compare grep-ai serper(the CLI) - Over MCP
compare_tools {"a": "grep-ai", "b": "serper"}at/mcp, no key