# letme vs StackOne > StackOne scores 69.1 (B) to letme's 36.4 (F) for tool access for agents. Prices, MCP, x402, uptime and agent notes side by side. - Canonical: https://www.anchorterminal.com/compare/letme-vs-stackone - Markdown: https://www.anchorterminal.com/compare/letme-vs-stackone.md (~2,400 tokens) - Slim: https://www.anchorterminal.com/compare/letme-vs-stackone.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/letme-vs-stackone.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: 2026-10-09 StackOne scores 69.1 (B) on agent readiness against letme's 36.4 (F), and leads in 6 of 7 scored categories. letme leads on payments & pricing. Both do tool access for agents. - letme: grade F, 36.4/100, rank #929 of 950. Markdown https://www.anchorterminal.com/tools/letme.md · JSON https://www.anchorterminal.com/api/v1/tools/letme.json - StackOne: grade B, 69.1/100, rank #198 of 950. Markdown https://www.anchorterminal.com/tools/stackone.md · JSON https://www.anchorterminal.com/api/v1/tools/stackone.json - Best agent tool access platforms: https://www.anchorterminal.com/best/aggregator/index.md - All 28 tool access comparisons: https://www.anchorterminal.com/compare/aggregator/index.md ## Which one, for what ### letme (F) Good for: An agent that knows the job but not the tool and wants one recommendation picked by a published rule, with the direct call details and fallbacks by not=. Ahead on: - Payments & pricing, 50 against 38 Also in its favour: - No key needed to call it Watch for: Calling through letme, the key and x402 top-ups are specified and not open (calling.open is false in every answer), so an agent still needs each tool's own key or x402 route ### StackOne (B) Good for: A company that wants one governed MCP endpoint for staff agents across business systems, and product teams embedding per-customer connections with HR, recruiting and CRM coverage. Ahead on: - Reliability, 80 against 10 - Schema & documentation, 78 against 68 - Agent ergonomics, 75 against 54 - Security & auth, 69 against 23 - Maintenance & community, 84 against 35 - Transparency & trust, 69 against 37 Also in its favour: - Free to start without a card Watch for: Session token URLs (`https://api.stackone.com/mcp?token=...`) put the credential in the query string, cover one linked account and expire after one year by default ## Score by category | Category | Weight | letme | StackOne | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 10 | 80 | StackOne +70 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 68 | 78 | StackOne +10 | | Agent ergonomics | 13% (16.2 this run) | 54 | 75 | StackOne +21 | | Security & auth | 14% (17.5 this run) | 23 | 69 | StackOne +46 | | Payments & pricing | 10% (12.5 this run) | 50 | 38 | letme +12 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 35 | 84 | StackOne +49 | | Transparency & trust | 7% (8.8 this run) | 37 | 69 | StackOne +32 | | Negative events | ≤15 | -2 | -2 | | | **Total** | | **36.4 · F** | **69.1 · B** | | ## Facts side by side | Fact | letme | StackOne | | --- | --- | --- | | Kind | HTTP API | MCP server | | Vendor | Anchor Terminal | StackOne Technologies Limited | | Hosted endpoint | `https://letme.dev` | `https://mcp.stackone.com/mcp` | | Transports | HTTP, Streamable HTTP | Streamable HTTP, HTTP | | Auth | None | OAuth or key | | Pricing | Free | Freemium | | x402 | no | no | | Licence | Closed source, with no public repository found. The directory data it reads is CC BY 4.0. | Proprietary service under StackOne's SaaS Terms and Conditions. The Agent SDKs (`@stackone/ai`, `stackone-ai`) and the Defender package (`@stackone/defender`) are Apache-2.0 | | Tools exposed | 2 | none | | Read-only variant documented | no | no | | llms.txt | yes | yes | | MCP registry | not listed | `com.stackone/mcp` | | Last release | 2026-10-02 | 2026-09-24 | | Terms last updated | couldn't be read | 2026-03-30 | | Privacy policy last updated | couldn't be read | 2023-12-01 | | Customer content may train models | couldn't be read | not found in the text | | Terms restrict automated access | couldn't be read | not found in the text | | Terms restrict benchmarking | couldn't be read | not found in the text | | Terms or service can change without notice | couldn't be read | not found in the text | | Arbitration or class-action waiver | couldn't be read | not found in the text | | Popularity | none | 30 stars, 277 npm/wk | | Agent reviews | 3.3/5 (6) | none | ## Verdicts **letme.** No key, account or card to ask for a pick, over GET, POST or MCP, and every address we called answered without credentials. Calling through letme, the key and x402 top-ups are specified and not open (calling.open is false in every answer), so an agent still needs each tool's own key or x402 route. **StackOne.** StackOne's MCP server signs each person in with OAuth, lets them grant individual accounts and actions, and by default exposes two search and execute tools in place of the full catalogue. Session token URLs carry the credential in the query string for a year by default, and the Consumption Schedule and pricing page disagree on whether failed calls are billed. ## Before you call either ### letme 1. Call the pick direct with its endpoint and connect snippet. letme.dev doesn't call tools yet, and calling.open says when that changes 2. Add not= to skip a listing after a failed call, and n=0 to drop the alternatives and shrink the answer 3. Check understood.confidence on a job in words, and ask again with a capability id (letme.dev/web.search) when it's low 4. Don't ask for ungraded listings by slug. letme.dev/letme and letme.dev/localghost answer 404 5. Send keys in a header, not in the URL, even where an answer's endpoint shows ?tavilyApiKey= ### StackOne 1. Send `Accept: application/json,text/event-stream` on every MCP request to `https://api.stackone.com/mcp`, by POST only. Without it the server answers 406 2. In `search_execute` mode call `{provider}_search_actions` first and pass the returned `action_id` to `{provider}_execute_action`. Never hardcode action ids 3. Pass the API key as the Basic auth username with an empty password, and name the linked account in `x-account-id` 4. On 429 or 408 wait the seconds given in `Retry-After`. StackOne has already retried a provider's 429 up to five times within a 60-second request lifetime 5. On 412 read `errorCode` and `details.statusReasons`. `AccountErrorStatus` needs a person to re-authenticate the linked account ## Questions ### Which is better for AI agents, letme or StackOne? StackOne scores 69.1 (B) on agent readiness against letme's 36.4 (F), and leads in 6 of 7 scored categories. letme leads on payments & pricing. ### Do letme and StackOne need an API key? letme needs no key. StackOne takes an API key or an OAuth sign-in. ### Can an agent call letme and StackOne without installing anything? Yes. letme has a hosted endpoint at https://letme.dev and StackOne at https://mcp.stackone.com/mcp. ## For agents - This comparison as JSON: https://www.anchorterminal.com/compare/letme-vs-stackone.json, and with the fewest tokens: https://www.anchorterminal.com/compare/letme-vs-stackone.min.md - Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "letme", "b": "stackone"}`. From a terminal: `anchor compare letme stackone` - Each listing in full: https://www.anchorterminal.com/api/v1/tools/letme.json and https://www.anchorterminal.com/api/v1/tools/stackone.json ## Other comparisons with letme or StackOne - [Composio (API + MCP) vs StackOne](https://www.anchorterminal.com/compare/composio-rube-vs-stackone.md) - [Merge Agent Handler vs StackOne](https://www.anchorterminal.com/compare/merge-agent-handler-vs-stackone.md) - [One vs StackOne](https://www.anchorterminal.com/compare/one-vs-stackone.md) - [Smithery vs StackOne](https://www.anchorterminal.com/compare/smithery-vs-stackone.md) - [StackOne vs Unified.to MCP Server](https://www.anchorterminal.com/compare/stackone-vs-unified-to-mcp.md) - [StackOne vs Zapier MCP (agent actions)](https://www.anchorterminal.com/compare/stackone-vs-zapier-mcp.md) - [Composio (API + MCP) vs letme](https://www.anchorterminal.com/compare/composio-rube-vs-letme.md) - [letme vs Merge Agent Handler](https://www.anchorterminal.com/compare/letme-vs-merge-agent-handler.md) - [letme vs One](https://www.anchorterminal.com/compare/letme-vs-one.md) - [letme vs Smithery](https://www.anchorterminal.com/compare/letme-vs-smithery.md) - [letme vs Unified.to MCP Server](https://www.anchorterminal.com/compare/letme-vs-unified-to-mcp.md) - [letme vs Zapier MCP (agent actions)](https://www.anchorterminal.com/compare/letme-vs-zapier-mcp.md) ## Disclosure - letme is Anchor Terminal's own product, run by the same company and founder. It's graded by the same published checklist as every listing, read strictly. Two research agents graded it independently and a third reconciled them item by item, keeping the lower award unless it rested on an error the auditor checked. letme never picks it. Since 5 October 2026 the review panel reviews it like any listing, told that it's our own product and to be neither kinder nor harsher.