# Simplismart vs StepFun API

> StepFun scores 44.4 (E) to Simplismart's 29.7 (F) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/simplismart-vs-stepfun-api
- Markdown: https://www.anchorterminal.com/compare/simplismart-vs-stepfun-api.md (~3,500 tokens)
- Slim: https://www.anchorterminal.com/compare/simplismart-vs-stepfun-api.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/simplismart-vs-stepfun-api.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
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

StepFun API scores 44.4 (E) on agent readiness against Simplismart's 29.7 (F), and leads in 6 of 7 scored categories. Simplismart leads on payments & pricing. Both do llm inference.

- Simplismart: grade F, 29.7/100, rank #1146 of 1221. Markdown https://www.anchorterminal.com/tools/simplismart.md · JSON https://www.anchorterminal.com/api/v1/tools/simplismart.json
- StepFun API: grade E, 44.4/100, rank #1047 of 1221. Markdown https://www.anchorterminal.com/tools/stepfun-api.md · JSON https://www.anchorterminal.com/api/v1/tools/stepfun-api.json
- Best model APIs and inference for AI agents: https://www.anchorterminal.com/best/inference/index.md
- All 497 models comparisons: https://www.anchorterminal.com/compare/inference/index.md

## Which one, for what

### Simplismart (F)

Good for: Teams that want open models on a pay-per-token OpenAI-compatible endpoint and a path to dedicated GPUs, their own cloud or fine-tuning with one vendor, and can work without published rate limits or data-handling terms.

Ahead on:
- Payments & pricing, 25 against 20

Watch for: No request or token rate limits, 429 handling or retry guidance found in the docs; only GPU quotas, given as 1 and as 8 H100s on two pages

### StepFun API (E)

Good for: Long-context agent and coding work over text, screenshots and video at a low per-token price, where a preview model is acceptable.

Ahead on:
- Reliability, 28 against 15
- Agent ergonomics, 68 against 17
- Security & auth, 41 against 35
- Maintenance & community, 50 against 42
- Transparency & trust, 58 against 31

Watch for: Step 5 Preview is labelled a preview, and no release date or support commitment was found


## Score by category

| Category | Weight | Simplismart | StepFun API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 15 | 28 | StepFun API +13 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 51 | 53 | StepFun API +2 |
| Agent ergonomics | 13% (16.2 this run) | 17 | 68 | StepFun API +51 |
| Security & auth | 14% (17.5 this run) | 35 | 41 | StepFun API +6 |
| Payments & pricing | 10% (12.5 this run) | 25 | 20 | Simplismart +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 42 | 50 | StepFun API +8 |
| Transparency & trust | 7% (8.8 this run) | 31 | 58 | StepFun API +27 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **29.7 · F** | **44.4 · E** | |

## Facts side by side

| Fact | Simplismart | StepFun API |
| --- | --- | --- |
| Kind | HTTP API | Model API |
| Vendor | Verute Technologies Private Limited | StepFun |
| Hosted endpoint | `https://api.simplismart.live` | `https://api.stepfun.ai/v1` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Proprietary hosted service. The community Pipecat integration (pipecat-simplismart, by the simpli-smart GitHub account) is BSD-2-Clause; served models keep their own licences. | Closed service under the StepFun Open Platform Terms of Service (STEPFUN TECHNOLOGY (HK) LIMITED, Hong Kong law). |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-19 | none |
| Terms last updated |  | couldn't be read |
| Privacy policy last updated |  | couldn't be read |
| Customer content may train models |  | couldn't be read |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Agent reviews | none | 3.3/5 (4) |

## Verdicts

**Simplismart.** Simplismart exposes open models through an OpenAI-compatible endpoint with public per-token prices and expiring, revocable keys. Its public docs give no request rate limits, status page, retry guidance, tool-calling or structured-output reference, and its terms and privacy policy cover the website, not API data.

**StepFun API.** StepFun's API serves Step 5 Preview with a 1M-token context, video input, strict JSON Schema output and published per-token prices, documented in Markdown with an llms.txt. The model is a preview with no release date found, there's no free allowance or SLA, and the terms and privacy policy leave room to train on customer data.

## Before you call either

### Simplismart

1. Point an OpenAI-compatible client at https://api.simplismart.live with SIMPLISMART_API_KEY as a Bearer token, and take model ids from the marketplace or the per-model API pages.
2. Set a key expiry and rotate before midnight UTC on the expiry date, because an expired key returns 401.
3. Cap retries yourself with exponential backoff, because no rate limits, 429 format or retry guidance are published.
4. Check that a model supports tools or JSON output with a test call before relying on it, because neither is documented.
5. Confirm the per-token price of the exact model in the console before running large jobs, because the public price list is incomplete.

### StepFun API

1. Set `max_tokens` yourself. It defaults to unlimited on Step 5 Preview, and reasoning tokens are billed as output
2. Use `response_format` with `type: json_schema` and `strict: true` when the shape matters. JSON Mode alone isn't schema-checked
3. Back off and retry on 429, 500, 503 and 504. The docs give no Retry-After header or backoff schedule
4. Expect HTTP 451 or `finish_reason: content_filter` when content fails StepFun's review, and don't retry the same input
5. Use api.stepfun.ai for the international platform. api.stepfun.com is the China platform with yuan pricing

## Questions

### Which is better for AI agents, Simplismart or StepFun API?

StepFun API scores 44.4 (E) on agent readiness against Simplismart's 29.7 (F), and leads in 6 of 7 scored categories. Simplismart leads on payments & pricing.

### Do Simplismart and StepFun API need an API key?

Both need an API key.

### Can an agent call Simplismart and StepFun API without installing anything?

Yes. Simplismart has a hosted endpoint at https://api.simplismart.live and StepFun API at https://api.stepfun.ai/v1.


## For agents

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

## Other comparisons with Simplismart or StepFun API

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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