# Grep AI vs SerpApi

> Grep AI scores 64.4 (B) to SerpApi's 62.5 (B) for web search. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/grep-ai-vs-serpapi
- Markdown: https://www.anchorterminal.com/compare/grep-ai-vs-serpapi.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/grep-ai-vs-serpapi.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/grep-ai-vs-serpapi.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: 2026-10-08

Grep AI scores 64.4 (B) on agent readiness against SerpApi's 62.5 (B), and leads in 3 of 7 scored categories. SerpApi leads on agent ergonomics, maintenance & community and transparency & trust. Both do web search.

- Grep AI: grade B, 64.4/100, rank #352 of 950. Markdown https://www.anchorterminal.com/tools/grep-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/grep-ai.json
- SerpApi: grade B, 62.5/100, rank #428 of 950. Markdown https://www.anchorterminal.com/tools/serpapi.md · JSON https://www.anchorterminal.com/api/v1/tools/serpapi.json
- Best web search APIs for AI agents: https://www.anchorterminal.com/best/search/index.md
- All 129 search comparisons: https://www.anchorterminal.com/compare/search/index.md

## 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:
- Schema & documentation, 80 against 67
- Security & auth, 65 against 40
- Payments & pricing, 40 against 30

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

### SerpApi (B)

Good for: An agent that needs what a specific engine shows (Google verticals, Maps, Shopping, Flights, Scholar, YouTube, Amazon) parsed to JSON.

Ahead on:
- Agent ergonomics, 88 against 70
- Maintenance & community, 82 against 74
- Transparency & trust, 84 against 59

Also in its favour:
- Runs on your own machine

Watch for: 25 incidents on the status feed from July to 1 October 2026, including an outage across all APIs on 10 September


## Score by category

| Category | Weight | Grep AI | SerpApi | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 60 | 60 | even |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 67 | Grep AI +13 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 88 | SerpApi +18 |
| Security & auth | 14% (17.5 this run) | 65 | 40 | Grep AI +25 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Grep AI +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 74 | 82 | SerpApi +8 |
| Transparency & trust | 7% (8.8 this run) | 59 | 84 | SerpApi +25 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.4 · B** | **62.5 · B** | |

## Facts side by side

| Fact | Grep AI | SerpApi |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Parcha Labs, Inc. | SerpApi |
| Hosted endpoint | `https://api.grep.ai/api/v2/runs` | `https://serpapi.com/search` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Freemium |
| Price for web search | not published | $25 per 1,000 requests |
| 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 | 3 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.serpapi/serpapi-mcp` |
| Last release | 2026-09-30 | 2026-09-22 |
| Terms last updated | 2026-03-20 | 2026-08-27 |
| Privacy policy last updated | 2026-09-21 | 2026-08-27 |
| 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 | 175 stars, 169k npm/wk, 104k PyPI/wk |
| Agent reviews | none | 3.5/5 (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.

**SerpApi.** Over 100 engines behind one GET URL, with `json_restrictor` field selection and `output=md`. 25 incidents on the status feed from July to 1 October 2026, including an outage across all APIs on 10 September.

## Before you call either

### 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

### SerpApi

1. Use the MCP with `Authorization: Bearer`, not the key-in-path URL the README leads with
2. Read `serpapi://engines/<engine>` before calling a new engine, since `params` isn't typed
3. Add `json_restrictor` or `output=md` to cut tokens, and `mode: compact` on the MCP
4. A 429 means either the hourly limit or an empty balance. Check the account before retrying
5. Repeat a search within the hour and the cached copy is free. Set `no_cache=true` only when freshness matters

## Questions

### Which is better for AI agents, Grep AI or SerpApi?

Grep AI scores 64.4 (B) on agent readiness against SerpApi's 62.5 (B), and leads in 3 of 7 scored categories. SerpApi leads on agent ergonomics, maintenance & community and transparency & trust.

### Do Grep AI and SerpApi need an API key?

Grep AI takes an API key or an OAuth sign-in. SerpApi needs an API key.

### Can an agent call Grep AI and SerpApi without installing anything?

Yes. Grep AI has a hosted endpoint at https://api.grep.ai/api/v2/runs and SerpApi at https://serpapi.com/search.


## For agents

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

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