How to connect OneSimpleAPI to Hermes Agent
Connect OneSimpleAPI to Hermes with ClawLink: paste your OneSimpleAPI key once and 15 tools work from chat. No MCP server to run, nothing stored on your machine.
OneSimpleAPIAPI KEYMCPOneSimpleAPI provides utility APIs for web content, images, PDFs, QR codes, URL management, validation, exchange rates, and file management.. Once connected, Hermes Agent can read and act on OneSimpleAPI from chat — pairing, token refresh, and tool wiring handled for you.
Most guides for giving Hermes Agent OneSimpleAPI access start with registering your own OAuth app or pasting API keys into env files, then leave the token refresh and tool wiring to you. ClawLink gives Hermes a more practical OneSimpleAPI setup: pair once in the browser and your always-on Hermes agent can act on OneSimpleAPI for you, reading and doing real work on your behalf with no auth, token refresh, or tool wiring to build yourself.
Setup
It takes three steps to connect Hermes to OneSimpleAPI.
1Install and pair
Install the ClawLink plugin, then pair Hermes with a one-time browser approval:
hermes plugins install ClawLink-HQ/hermes-plugin --enable- 2
Connect OneSimpleAPI
Paste your API key in the dashboard.
- 3
Use it from chat
Ask Hermes Agent: "What can you do with OneSimpleAPI?"
Install by command
The prompt above walks Hermes through this. By hand, it is four commands and a browser approval:
hermes plugins install ClawLink-HQ/hermes-plugin --enable
hermes clawlink begin # prints an approval link — open it and approve
hermes clawlink finish # after approving in the browser
hermes clawlink testThen connect OneSimpleAPI in the ClawLink dashboard — paste your OneSimpleAPI API key once.
Verify the connection by asking Hermes:
Use OneSimpleAPI to analyze readability and walk me through the result in plain English.
Using a different agent?
The Hermes plugin is one client of ClawLink's MCP server. Claude Code, Cursor, Codex, or any agent that can run a shell command pairs with the same ClawLink account through the CLI:
npx -y @useclawlink/cli loginlogin opens the same browser approval and stores a credential locally. Once OneSimpleAPI is connected in the dashboard, that agent calls the same 15 OneSimpleAPI tools over MCP. Full setup for MCP clients and shell agents: connect apps to any AI agent.
OneSimpleAPI MCP for Hermes
Looking for a OneSimpleAPI MCP server for Hermes Agent? ClawLink connects OneSimpleAPI to Hermes Agent and exposes 15 OneSimpleAPI tools your agent can call over MCP, with hosted auth and nothing to run or maintain yourself. Using OpenClaw instead? The OpenClaw OneSimpleAPI integration works the same way.
What the Hermes Agent OneSimpleAPI integration can do
15 OneSimpleAPI tools are ready for Hermes Agent once the account is connected. The 14 below are the ones people reach for most; your agent can call all 15.
14 of 15 OneSimpleAPI tools for Hermes
| Tool | What it does |
|---|---|
Analyze readability onesimpleapi_analyze_readability | Analyze text for readability, grade level, reading time, difficult-word counts, and sentiment |
Calculate ppp discount onesimpleapi_calculate_ppp_discount | Calculate a purchasing-power-parity discount and localized price between an origin and a |
Convert currency onesimpleapi_convert_currency | Convert an amount between supported currencies and return the converted value and exchange rate |
Expand short URL onesimpleapi_expand_short_url | Resolve a shortened URL and return its final URL, redirect count, and redirect trace |
Generate or convert color onesimpleapi_generate_or_convert_color | Generate a deterministic color palette from text or convert a supplied color into HEX, RGB |
Get image information onesimpleapi_get_image_information | Extract dimensions, image metadata, EXIF camera fields, and available GPS details from an image |
List files onesimpleapi_list_files | Return one page of generated files owned by the connected account, optionally filtered by live |
List short URLS onesimpleapi_list_short_urls | Return one page of OneSimpleAPI short URLs and their click statistics |
Validate email onesimpleapi_validate_email | Validate an email address and assess its domain, MX records, deliverability, disposability |
Capture screenshot onesimpleapi_capture_screenshot | Capture a webpage URL or raw HTML as a hosted screenshot and return its URL and rendering |
Create short URL onesimpleapi_create_short_url | Create a OneSimpleAPI short URL with optional one-time-use, redirect, query-forwarding, and |
Generate PDF onesimpleapi_generate_pdf | Generate a PDF from either a webpage URL or raw HTML and return the hosted PDF URL and page |
Generate qr code onesimpleapi_generate_qr_code | Generate a hosted PNG or SVG QR code for a message and return its URL |
Transform image onesimpleapi_transform_image | Resize, crop, rotate, flip, filter, border, optimize, and host an image, returning the |
Try it: find the OneSimpleAPI tool you need
Browse the 14 OneSimpleAPI tools
Click any tool to see exactly what Hermes can do and copy a ready-to-use prompt.
Example prompts
Use OneSimpleAPI to analyze readability and walk me through the result in plain English.
Use OneSimpleAPI to calculate ppp discount and walk me through the result in plain English.
Use OneSimpleAPI to convert currency and walk me through the result in plain English.
Use OneSimpleAPI to expand short url and walk me through the result in plain English.
ClawLink vs. building it yourself
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want OneSimpleAPI working from chat.
| Manual | ClawLink | |
|---|---|---|
| Credential handling | Collect, validate, store, and rotate the OneSimpleAPI API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected OneSimpleAPI account becomes available to the agent without you building credential management. |
| Ongoing maintenance | You own refresh logic, permission debugging, environment config, and every provider-specific edge case for OneSimpleAPI. | ClawLink handles the repetitive integration plumbing so your team can focus on the workflow instead of the infrastructure. |
| Agent usability | You still need to expose the right OneSimpleAPI actions to the runtime in a format your agent can reliably use. | 15 tools for OneSimpleAPI are already exposed through ClawLink, so the agent can read and act from chat immediately. |
ClawLink vs. Composio
Composio also exposes OneSimpleAPI to AI agents. It is developer infrastructure: Python and TypeScript SDKs, an MCP server, and a catalog past 1,000 apps, aimed at teams shipping agent products. ClawLink is built for Hermes Agent users instead. You install the plugin once, connect OneSimpleAPI in the browser, and the 15 tools above work from chat. There is no SDK and no config file, and the OneSimpleAPI key you paste at setup is stored server-side rather than kept in your environment. Choosing between them? Read the full Composio alternatives comparison.
Troubleshooting
Hermes paired but still can't use OneSimpleAPI
Pairing is a two-step handshake: run hermes clawlink begin, approve the link in your browser, then run hermes clawlink finish. If you ran finish before approving, or the approval link expired, run hermes clawlink begin again to get a fresh link. Confirm the plugin was installed with --enable, then verify with hermes clawlink test.
Connection succeeds but no tools appear
Reconnect OneSimpleAPI from the dashboard, then start a fresh chat if the runtime still has the old tool catalog loaded.
"Tool schema not loaded yet" error when calling OneSimpleAPI tools
OneSimpleAPI tool schemas load on demand the first time a tool runs and are cached after that, so this error usually clears on its own: wait a few seconds and retry the same request. If every OneSimpleAPI call keeps failing with it in a fresh chat, reconnect from the dashboard, and contact support if it still persists — that pattern points to a configuration problem on our side, not something you can fix by reconnecting again.
OneSimpleAPI returns 403 or "permission denied" on one action while others work
Two usual causes. The connected account may not have access to the specific workspace, inbox, store, or project in the request — check that first. If access looks right, the agent may have sent a placeholder value (like "YOUR_ID" or an example id from documentation) instead of a real one: ask it to run a list or search tool first, then retry the action with a real id from those results. Most failures at this stage are one of these two, not ClawLink bugs.
API key setup works but results look incomplete
Double-check that the API key for OneSimpleAPI has the right scopes or account access. A valid key can still be too limited for some reads or writes.
FAQ
Is there a Hermes Agent OneSimpleAPI integration?
Yes. ClawLink is the fastest way to connect Hermes to OneSimpleAPI: link your OneSimpleAPI account once in the browser and Hermes Agent can call the OneSimpleAPI API through 15 ready-made tools — no custom code or token handling.
How do I connect OneSimpleAPI to Hermes with ClawLink?
Install the plugin with hermes plugins install ClawLink-HQ/hermes-plugin --enable, then pair once: run hermes clawlink begin, approve the link in your browser, and run hermes clawlink finish. Connect OneSimpleAPI in the dashboard and Hermes can use it from the next message — no config files, and the OneSimpleAPI key you paste is stored server-side instead of in your environment.
How long does it take to connect OneSimpleAPI to Hermes Agent?
About two minutes. Sign in, click Connect next to OneSimpleAPI in the dashboard, authenticate, and Hermes Agent can use it from the next chat message.
Why use ClawLink instead of wiring OneSimpleAPI up myself?
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want OneSimpleAPI working from chat.
Hermes paired but still can't use OneSimpleAPI
Pairing is a two-step handshake: run hermes clawlink begin, approve the link in your browser, then run hermes clawlink finish. If you ran finish before approving, or the approval link expired, run hermes clawlink begin again to get a fresh link. Confirm the plugin was installed with --enable, then verify with hermes clawlink test.
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