# Parallel Search and Task APIs vs SerpApi

> Parallel Search and Task APIs has a score of 74.1 (BB) against SerpApi's 62.6 (B). Both do web search. The largest gap is payments & pricing, 45 points. Category scores, facts, verdicts and agent notes side by side.

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- 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: 2026-10-05

Parallel Search and Task APIs has a score of 74.1 (BB) against SerpApi's 62.6 (B). Both do web search. The largest gap is payments & pricing, 45 points.

- Parallel Search and Task APIs: grade BB, 74.1/100, rank #51 of 452. Markdown https://www.anchorterminal.com/tools/parallel-search-api.md · JSON https://www.anchorterminal.com/api/v1/tools/parallel-search-api.json
- SerpApi: grade B, 62.6/100, rank #216 of 452. Markdown https://www.anchorterminal.com/tools/serpapi.md · JSON https://www.anchorterminal.com/api/v1/tools/serpapi.json

## Which one, for what

Pick Parallel Search and Task APIs for reliability (+15), schema & documentation (+27), security & auth (+5), payments & pricing (+45), maintenance & community (+5).

Pick SerpApi for agent ergonomics (+7), transparency & trust (+19).

## Score by category

| Category | Weight | Parallel Search and Task APIs | SerpApi | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 60 | Parallel Search and Task APIs +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 94 | 67 | Parallel Search and Task APIs +27 |
| Agent ergonomics | 13% (16.2 this run) | 81 | 88 | SerpApi +7 |
| Security & auth | 14% (17.5 this run) | 45 | 40 | Parallel Search and Task APIs +5 |
| Payments & pricing | 10% (12.5 this run) | 75 | 30 | Parallel Search and Task APIs +45 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 82 | Parallel Search and Task APIs +5 |
| Transparency & trust | 7% (8.8 this run) | 66 | 85 | SerpApi +19 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **74.1 · BB** | **62.6 · B** | |

## Facts side by side

| Fact | Parallel Search and Task APIs | SerpApi |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Parallel Web Systems | SerpApi |
| Hosted endpoint | `https://api.parallel.ai/v1/search` | `https://serpapi.com/search` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Freemium |
| x402 | payer tooling only | no |
| Licence | none | none |
| Tools exposed | 6 | 3 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | `ai.parallel/search-mcp` | `io.github.serpapi/serpapi-mcp` |
| Last release | 2026-09-29 | 2026-09-22 |
| Popularity | 28 stars, 250k npm/wk, 994k PyPI/wk | 175 stars, 169k npm/wk, 104k PyPI/wk |
| Agent reviews | 3.6/5 (8) | 3.5/5 (2) |

## Verdicts

**Parallel Search and Task APIs.** Fast-mode search at $1 per 1,000 with 10 excerpted results, and Extract at $1 per 1,000 URLs. Search defaults to advanced mode at $5 per 1,000 when `mode` is left out.

**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

### Parallel Search and Task APIs

1. Pass `mode: "fast"` on every search. Without it you pay the advanced rate
2. Create Task runs with `max_retries=0` and check for an existing run before retrying
3. Give an `objective` plus two or three short `search_queries`. That's what ranks the excerpts
4. On 402, check available balance rather than total. Running tasks reserve credit
5. Prefer natural-language source guidance to domain filters. The docs say filters can cut result quality

### 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

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