How to connect Polygon.io to Hermes Agent
Connect Polygon.io to Hermes with ClawLink: paste your Polygon.io key once and 60 tools work from chat. No MCP server to run, nothing stored on your machine.
Polygon.ioAPI KEYMCPRead stock, options, forex, and crypto market data. Once connected, Hermes Agent can read and act on Polygon.io from chat — pairing, token refresh, and tool wiring handled for you.
Most guides for giving Hermes Agent Polygon.io 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 Polygon.io setup: pair once in the browser and your always-on Hermes agent can act on Polygon.io 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 Polygon.io.
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 Polygon.io
Paste your API key in the dashboard.
- 3
Use it from chat
Ask Hermes Agent: "What can you do with Polygon.io?"
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 Polygon.io in the ClawLink dashboard — paste your Polygon.io API key once.
Verify the connection by asking Hermes:
Pull the relevant data from Polygon.io, summarize it in plain English, and point out anything that needs attention.
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 Polygon.io is connected in the dashboard, that agent calls the same 60 Polygon.io tools over MCP. Full setup for MCP clients and shell agents: connect apps to any AI agent.
Polygon.io MCP for Hermes
Looking for a Polygon.io MCP server for Hermes Agent? ClawLink connects Polygon.io to Hermes Agent and exposes 60 Polygon.io tools your agent can call over MCP, with hosted auth and nothing to run or maintain yourself. Using OpenClaw instead? The OpenClaw Polygon.io integration works the same way.
What the Hermes Agent Polygon.io integration can do
60 Polygon.io tools are ready for Hermes Agent once the account is connected. The 30 below are the ones people reach for most; your agent can call all 60.
30 of 60 Polygon.io tools for Hermes
| Tool | What it does |
|---|---|
Get all tickers polygon_io_get_all_tickers | Retrieve a comprehensive list of supported ticker symbols across all asset classes |
Get condition codes polygon_io_get_condition_codes | Retrieve a unified list of trade and quote condition codes and their definitions |
Get crypto ema polygon_io_get_crypto_ema | Calculate Exponential Moving Average (EMA) technical indicator for a crypto ticker |
Get crypto macd polygon_io_get_crypto_macd | Calculate Moving Average Convergence/Divergence (MACD) technical indicator for a crypto ticker |
Get crypto open close polygon_io_get_crypto_open_close | Get the open, close, high, low, and volume for a cryptocurrency pair on a specific date |
Get crypto rsi polygon_io_get_crypto_rsi | Calculate the Relative Strength Index (RSI) for a cryptocurrency ticker |
Get crypto sma polygon_io_get_crypto_sma | Calculate Simple Moving Average (SMA) technical indicator for a cryptocurrency ticker |
Get daily open close polygon_io_get_daily_open_close | Get the daily open, close, after-hours, and pre-market prices for a stock on a specific date |
Get dividends polygon_io_get_dividends | Retrieve a historical record of cash dividend distributions for a given ticker |
Get economy inflation2 polygon_io_get_economy_inflation2 | Retrieve key indicators of realized inflation including CPI and PCE price indexes with |
Get ema polygon_io_get_ema | Retrieve the Exponential Moving Average for a stock ticker |
Get filing polygon_io_get_filing | Retrieve detailed information about a specific SEC filing by filing ID |
Get filing file polygon_io_get_filing_file | Download a specific file from an SEC filing |
Get forex ema polygon_io_get_forex_ema | Calculate Exponential Moving Average (EMA) technical indicator for a forex pair |
Get forex macd polygon_io_get_forex_macd | Calculate Moving Average Convergence/Divergence (MACD) technical indicator for a forex pair |
Get forex real time currency conversion polygon_io_get_forex_real_time_currency_conversion | Convert amounts between currency pairs using real-time forex rates |
Get forex rsi polygon_io_get_forex_rsi | Calculate the Relative Strength Index (RSI) technical indicator for a forex pair |
Get forex sma polygon_io_get_forex_sma | Calculate Simple Moving Average (SMA) technical indicator for a forex pair |
Get futures quotes polygon_io_get_futures_quotes | Get real-time quote information for futures contracts with bid/ask prices, sizes, and timestamps |
Get grouped daily polygon_io_get_grouped_daily | Retrieve daily OHLCV data for the entire market for a given date |
Get historic forex ticks polygon_io_get_historic_forex_ticks | Get historic ticks for a currency pair on a specific date |
Get inflation expectations polygon_io_get_inflation_expectations | Retrieve inflation expectations data from the Federal Reserve, including market-based rates and |
Get ipo data polygon_io_get_ipo_data | Retrieve comprehensive information on Initial Public Offerings (IPOs), including upcoming and |
Get labor market polygon_io_get_labor_market | Retrieve labor market data including unemployment rate, labor force participation rate, average |
Get macd polygon_io_get_macd | Retrieve the Moving Average Convergence/Divergence (MACD) for a stock ticker |
Get market holidays polygon_io_get_market_holidays | Retrieve upcoming market holidays and their corresponding open/close times |
Get market status polygon_io_get_market_status | Retrieve the current trading status across major exchanges and currency markets |
Get news polygon_io_get_news | Retrieve the most recent news articles for a specified ticker |
Get options contract overview polygon_io_get_options_contract_overview | Retrieve comprehensive details about a specific options contract including contract type |
Get options ema polygon_io_get_options_ema | Calculate Exponential Moving Average (EMA) technical indicator for an options ticker |
Try it: find the Polygon.io tool you need
Browse the 30 Polygon.io tools
Click any tool to see exactly what Hermes can do and copy a ready-to-use prompt.
Example prompts
Pull the relevant data from Polygon.io, summarize it in plain English, and point out anything that needs attention.
Pull the relevant data from Polygon.io, summarize it in plain English, and point out anything that needs attention.
Pull the relevant data from Polygon.io, summarize it in plain English, and point out anything that needs attention.
Pull the relevant data from Polygon.io, summarize it in plain English, and point out anything that needs attention.
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 Polygon.io working from chat.
| Manual | ClawLink | |
|---|---|---|
| Credential handling | Collect, validate, store, and rotate the Polygon.io API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected Polygon.io 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 Polygon.io. | 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 Polygon.io actions to the runtime in a format your agent can reliably use. | 60 tools for Polygon.io are already exposed through ClawLink, so the agent can read and act from chat immediately. |
ClawLink vs. Composio
Composio also exposes Polygon.io 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 Polygon.io in the browser, and the 60 tools above work from chat. There is no SDK and no config file, and the Polygon.io 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 Polygon.io
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 Polygon.io 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 Polygon.io tools
Polygon.io 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 Polygon.io 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.
Polygon.io 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 Polygon.io 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 Polygon.io integration?
Yes. ClawLink is the fastest way to connect Hermes to Polygon.io: link your Polygon.io account once in the browser and Hermes Agent can call the Polygon.io API through 60 ready-made tools — no custom code or token handling.
How do I connect Polygon.io 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 Polygon.io in the dashboard and Hermes can use it from the next message — no config files, and the Polygon.io key you paste is stored server-side instead of in your environment.
How long does it take to connect Polygon.io to Hermes Agent?
About two minutes. Sign in, click Connect next to Polygon.io in the dashboard, authenticate, and Hermes Agent can use it from the next chat message.
Why use ClawLink instead of wiring Polygon.io 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 Polygon.io working from chat.
Hermes paired but still can't use Polygon.io
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.
