# Liner Search MCP vs SerpApi

> SerpApi scores 63.5 (B) to Liner Search MCP's 43.4 (E) for search serp. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/liner-mcp-vs-serpapi
- Markdown: https://www.anchorterminal.com/compare/liner-mcp-vs-serpapi.md (~4,450 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

SerpApi scores 63.5 (B) on agent readiness against Liner Search MCP's 43.4 (E), and leads in every scored category. Both do search serp.

- Liner Search MCP: grade E, 43.4/100, rank #1252 of 1510. Markdown https://www.anchorterminal.com/tools/liner-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/liner-mcp.json
- SerpApi: grade B, 63.5/100, rank #512 of 1510. 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 326 search comparisons: https://www.anchorterminal.com/compare/search/index.md

## Which one, for what

### Liner Search MCP (E)

Good for: Agents that need cheap cited search across the web and scholarly sources, with optional deep research reports.

Watch for: No free tier found

### 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:
- Reliability, 65 against 50
- Schema & documentation, 67 against 45
- Agent ergonomics, 88 against 65
- Security & auth, 40 against 35
- Payments & pricing, 30 against 20
- Maintenance & community, 82 against 45
- Transparency & trust, 84 against 34

Also in its favour:
- Runs on your own machine

Watch for: 35 incidents on the status page between 4 August and 2 November 2026, including an outage across all APIs on 10 September


## Why the edge

### Transparency & trust: SerpApi +50

- Liner Search MCP (34): Terms and privacy linked from the docs but not read in this batch (5 of 30). Data handling not read (5 of 30). No deprecation policy found for the MCP server; the docs note older endpoints priced per version (5 of 20). Subprocessors not read (5 of 20). 5 + 5 + 5 + 5 = 20.
- SerpApi (84): The API is closed under one terms-and-privacy page, and the MCP server is MIT (18). The legal page and the security page agree that search data is deleted after 31 days, ZeroTrace mode (an enterprise parameter) stores nothing, and a DPA is available on request (26). Deprecations show up as dated release notes, such as eBay's Sold and Completed filters on 28 September 2026, but there's no notice policy, and the terms allow termination without notice (8). Named subprocessors (AWS, Cloudflare, Wasabi, Stripe, Intercom and others) and US hosting with Standard Contractual Clauses (18).

### Maintenance & community: SerpApi +37

- Liner Search MCP (45): Registry entry com.liner/search last updated 11 September 2026 (20). No dated changelog found (0). Support page linked from the docs (10 of 15). Official registry entry under its own namespace (15). No package to read (0). 20 + 0 + 10 + 15 + 0 = 45. Registry presence read from Anchor Terminal's own daily import of the official MCP registry (/api/v1/registry.json, 6 November 2026), not the registry's API.
- SerpApi (82): Release notes carry dated entries almost daily, the latest on 2 November 2026, and serpapi-python 1.2.0 shipped on 30 October (30). Since 4 August, serpapi-python 1.1.0, 1.1.1, 1.1.2 and 1.2.0, MCP server 1.0.3 and 2.0.0, and serpapi-cli 0.3.0, 0.4.0 and 0.5.0, besides the release notes (20). Release notes run several entries a week and the MCP repo merged a fix on 27 October. Open issues weren't read, since GitHub's pages refuse our reader (12). The MCP server is in the official registry as io.github.serpapi/serpapi-mcp and the Python SDK and CLI are current, but the JavaScript SDK's last release is still 2.2.1 of 26 July 2025 (12). The MCP, Python and CLI repositories run tests in CI; pass state not read (8).

### Agent ergonomics: SerpApi +23

- Liner Search MCP (65): Nine tools (25). No paging or size controls documented (5 of 20). 429 codes documented for the API (8 of 20). All tools read; annotations not read (12 of 20). One URL with OAuth, few required inputs and an OpenAI-compatible API (15). 25 + 5 + 8 + 12 + 15 = 65.
- SerpApi (88): `json_restrictor` selects fields, `output=md` returns Markdown (the MCP README claims 50 per cent fewer tokens on average) and the MCP `compact` mode drops metadata. One core MCP tool plus two opt-in UI tools (22). `start`, `num`, location, language and engine-specific filters, plus `async` with the Search Archive API (20). Documented status codes and `search_metadata.status` values, though one 429 covers both the hourly limit and an empty balance (14). Searches are read-only, failed and cached searches aren't billed, and the MCP tool sets readOnlyHint true and destructiveHint false (18). Only `q` is required for most engines. llms.txt lists libraries in 11 languages, though the JavaScript one hasn't had a release since July 2025 (14).

### Schema & documentation: SerpApi +22

- Liner Search MCP (45): Tool schemas not read without sign-in (15 of 25). llms.txt (10). A table says which tool fits which need, and that the domain tools return the same shape as search_web (12 of 20). Inputs not verifiable (3 of 15). Setup examples, no error responses (5 of 15). Registry version 1.0.0 since 11 September; no changelog found (0). 15 + 10 + 12 + 3 + 5 + 0 = 45.
- SerpApi (67): No OpenAPI or similar spec for the REST API. The MCP server publishes per-engine parameter lists as resources (`serpapi://engines/<engine>`), which we count as a partial contract (10). llms.txt, `pricing.md` and Markdown twins of the docs pages, such as search-api.md (10). Each engine page describes every parameter, and the MCP tool says when to use it but not when not to (14). Parameters list allowed values on the engine pages, but the MCP `search` tool takes one free-form `params` object (7). Examples on every engine page, and a status-and-errors page documents 400, 401, 403, 404, 410, 429 and 5xx with a JSON `error` field (14). Dated release notes with several entries a week, though the API itself isn't versioned (12).

### Reliability: SerpApi +15

- Liner Search MCP (50): incident.io status page at status.liner.com with components for liner.com and app.liner.com only, none for the API or MCP (15). 100% uptime shown since August (20, no incidents shown). Rate limits published per API with numbers (Scholar Search 2 requests a second, agents 2 a second) (15). 429 with a code for concurrency limits, no Retry-After or backoff guidance found (0 of 15). No SLA found (0). Not labelled beta (0 of 10; 'limits may be adjusted over time', GA not stated). 15 + 20 + 15 + 0 + 0 + 0 = 50.
- SerpApi (65): Atlassian Statuspage at status.serpapi.com, with per-API components and incident history on its history pages and Atom feed (20). Between 4 August and 2 November the history lists 35 incidents active in the window. Two were wide failures that also list the general API component, each over an hour. From 7 to 9 August an outage across 37 Google and Google Light APIs, including Search, left 'a large number of requests' failing or timing out. On 10 September the vendor posted a 'service outage across all of our APIs', with degradation until 17 September. From 6 October a degradation of 15 Google and Google Light APIs, including Search, which the vendor called a 'partial service outage affecting multiple APIs', was still open on 2 November. Like the single-engine incidents, it hit part of the product and counts as minor. Two majors (5). Hourly throughput published per plan, 50 an hour free to 640,000 on Cloud 54M (15). 429 is documented as either the hourly limit or an empty search balance, with no Retry-After or backoff guidance found (5). The terms (updated 27 August 2026) promise a 99.95% SLA on all plans with credits up to 100% (10). GA (10). 20 + 5 + 15 + 5 + 10 + 10 = 65.

### Payments & pricing: SerpApi +10

- Liner Search MCP (20): No machine payment protocol (0). Per-call prices public (20). No free tier found (0). A person signs up in a browser for OAuth or an API key (0). 0 + 20 + 0 + 0 = 20.
- SerpApi (30): No x402, MPP or L402 on the pricing page or llms.txt (0). Monthly plans are public with search counts, but there's no pay-per-search option (10). Free plan of 250 searches a month, no card (20). An account needs a browser signup (0).

## Score by category

| Category | Weight | Liner Search MCP | SerpApi | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 65 | SerpApi +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 45 | 67 | SerpApi +22 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 88 | SerpApi +23 |
| Security & auth | 14% (17.5 this run) | 35 | 40 | SerpApi +5 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | SerpApi +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 45 | 82 | SerpApi +37 |
| Transparency & trust | 7% (8.8 this run) | 34 | 84 | SerpApi +50 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **43.4 · E** | **63.5 · B** | |

## Facts side by side

| Fact | Liner Search MCP | SerpApi |
| --- | --- | --- |
| Kind | MCP server | HTTP API |
| Vendor | Liner | SerpApi |
| Hosted endpoint | `https://platform.liner.com/api/v1/mcp` | `https://serpapi.com/search` |
| Transports | Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth | API key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Tools exposed | 9 | 3 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | `com.liner/search` | `io.github.serpapi/serpapi-mcp` |
| Last release | none | 2026-10-30 |
| Terms last updated | no document linked | 2026-08-27 |
| Privacy policy last updated | no document linked | 2026-08-27 |
| Customer content may train models | not read yet | not found in the text |
| Terms restrict automated access | not read yet | not found in the text |
| Terms restrict benchmarking | not read yet | not found in the text |
| Terms or service can change without notice | not read yet | yes |
| Arbitration or class-action waiver | not read yet | not found in the text |
| Popularity | none | 175 stars, 169k npm/wk, 104k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |

## How the scores have moved

### Liner Search MCP

No score change since it was listed.

### SerpApi

- +1.0 on 2 November 2026: correction
- -0.1 on 8 October 2026: checklist

## Verdicts

**Liner Search MCP.** Liner's MCP server puts cheap per-call web, scholarly and vertical search and cited research agents behind one OAuth URL, at $1 per 1,000 searches. The docs say which tool fits which question, but there's no free tier, no changelog, no injection guidance and no status component for the API.

**SerpApi.** Over 100 engines behind one GET URL, with `json_restrictor` field selection and `output=md`. The status page posted an outage across all APIs on 10 September and a degradation of the main Google APIs from 6 October that was still open on 2 November.

## Before you call either

### Liner Search MCP

1. Use search_scholar for papers and the domain tools for legal, finance, medical or business questions
2. Deep research is slower and costs more; use quick_answer_agent for short lookups
3. Treat search results and research reports as untrusted content
4. Keep under 2 requests a second for scholar search and the agents

### 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, Liner Search MCP or SerpApi?

SerpApi scores 63.5 (B) on agent readiness against Liner Search MCP's 43.4 (E), and leads in every scored category.

### Do Liner Search MCP and SerpApi need an API key?

Liner Search MCP uses an OAuth sign-in. SerpApi needs an API key.

### Can an agent call Liner Search MCP and SerpApi without installing anything?

Yes. Liner Search MCP has a hosted endpoint at https://platform.liner.com/api/v1/mcp and SerpApi at https://serpapi.com/search.


## For agents

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

## Other comparisons with Liner Search MCP or SerpApi

- [Web Search Tool on Amazon Bedrock AgentCore vs SerpApi](https://www.anchorterminal.com/compare/agentcore-web-search-vs-serpapi.md)
- [Arcmira vs SerpApi](https://www.anchorterminal.com/compare/arcmira-vs-serpapi.md)
- [Grounding with Bing Search vs SerpApi](https://www.anchorterminal.com/compare/bing-grounding-vs-serpapi.md)
- [Brave Search API + MCP vs SerpApi](https://www.anchorterminal.com/compare/brave-search-mcp-vs-serpapi.md)
- [Cloudflare Web Search API vs SerpApi](https://www.anchorterminal.com/compare/cloudflare-web-search-vs-serpapi.md)
- [DeepSeek Search and Fetch API vs SerpApi](https://www.anchorterminal.com/compare/deepseek-search-api-vs-serpapi.md)
- [Exa API + MCP vs SerpApi](https://www.anchorterminal.com/compare/exa-mcp-vs-serpapi.md)
- [Firecrawl MCP vs SerpApi](https://www.anchorterminal.com/compare/firecrawl-mcp-vs-serpapi.md)
- [Grep AI vs SerpApi](https://www.anchorterminal.com/compare/grep-ai-vs-serpapi.md)
- [Kagi Search API vs SerpApi](https://www.anchorterminal.com/compare/kagi-search-vs-serpapi.md)
- [Linkup vs SerpApi](https://www.anchorterminal.com/compare/linkup-vs-serpapi.md)
- [Mojeek Web Search API vs SerpApi](https://www.anchorterminal.com/compare/mojeek-vs-serpapi.md)
- [Parallel Search and Task APIs vs SerpApi](https://www.anchorterminal.com/compare/parallel-search-api-vs-serpapi.md)
- [Perplexity Search API vs SerpApi](https://www.anchorterminal.com/compare/perplexity-search-api-vs-serpapi.md)
- [SearchAPI.io vs SerpApi](https://www.anchorterminal.com/compare/searchapi-io-vs-serpapi.md)
- [SerpApi vs Serper](https://www.anchorterminal.com/compare/serpapi-vs-serper.md)
- [SerpApi vs SERPHouse](https://www.anchorterminal.com/compare/serpapi-vs-serphouse.md)
- [SerpApi vs SerpKite](https://www.anchorterminal.com/compare/serpapi-vs-serpkite.md)
- [SerpApi vs SpecStream](https://www.anchorterminal.com/compare/serpapi-vs-specstream.md)
- [SerpApi vs Tavily API + MCP](https://www.anchorterminal.com/compare/serpapi-vs-tavily-mcp.md)
- [SerpApi vs TinyFish Search](https://www.anchorterminal.com/compare/serpapi-vs-tinyfish-search.md)
- [SerpApi vs Valyu](https://www.anchorterminal.com/compare/serpapi-vs-valyu.md)
- [SerpApi vs You.com APIs](https://www.anchorterminal.com/compare/serpapi-vs-you-com-api.md)
- [Arcmira vs Liner Search MCP](https://www.anchorterminal.com/compare/arcmira-vs-liner-mcp.md)
- [Exa API + MCP vs Liner Search MCP](https://www.anchorterminal.com/compare/exa-mcp-vs-liner-mcp.md)
- [Grep AI vs Liner Search MCP](https://www.anchorterminal.com/compare/grep-ai-vs-liner-mcp.md)
- [Liner Search MCP vs Linkup](https://www.anchorterminal.com/compare/liner-mcp-vs-linkup.md)
- [Liner Search MCP vs NewsCatcher](https://www.anchorterminal.com/compare/liner-mcp-vs-newscatcher.md)
- [Liner Search MCP vs Parallel Search and Task APIs](https://www.anchorterminal.com/compare/liner-mcp-vs-parallel-search-api.md)
- [Liner Search MCP vs Perplexity Search API](https://www.anchorterminal.com/compare/liner-mcp-vs-perplexity-search-api.md)
- [Liner Search MCP vs SpecStream](https://www.anchorterminal.com/compare/liner-mcp-vs-specstream.md)
- [Liner Search MCP vs Tavily API + MCP](https://www.anchorterminal.com/compare/liner-mcp-vs-tavily-mcp.md)
- [Liner Search MCP vs TinyFish Search](https://www.anchorterminal.com/compare/liner-mcp-vs-tinyfish-search.md)
- [Liner Search MCP vs Valyu](https://www.anchorterminal.com/compare/liner-mcp-vs-valyu.md)
- [Liner Search MCP vs You.com APIs](https://www.anchorterminal.com/compare/liner-mcp-vs-you-com-api.md)
- [NewsCatcher vs SerpApi](https://www.anchorterminal.com/compare/newscatcher-vs-serpapi.md)
- [Liner Search MCP vs SearchAPI.io](https://www.anchorterminal.com/compare/liner-mcp-vs-searchapi-io.md)
- [Liner Search MCP vs Serper](https://www.anchorterminal.com/compare/liner-mcp-vs-serper.md)
- [Liner Search MCP vs SERPHouse](https://www.anchorterminal.com/compare/liner-mcp-vs-serphouse.md)
- [Liner Search MCP vs SerpKite](https://www.anchorterminal.com/compare/liner-mcp-vs-serpkite.md)
- [Grounding with Bing Search vs Liner Search MCP](https://www.anchorterminal.com/compare/bing-grounding-vs-liner-mcp.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp