How to Connect Apollo.io to Codex
Query your Apollo.io data directly from Codex using Sequel’s MCP server. Ask questions in plain English, with no SQL, no dashboards, and no context switching.
Short answer
Connect Apollo.io to Sequel, then add Sequel's MCP server to Codex using the config on this page. Codex can then query your live Apollo.io data in plain English, with no connector code and no CSV exports. Both steps take a few minutes.
Everything you can ask Codex about your Apollo.io data.
Ask in plain English — Sequel translates it into a Apollo.io query, runs it, and Codex hands back the answer. No SQL, no dashboards, no CSV exports.
- Find VPs of Sales at SaaS companies in the US with 50-200 employees.
- Which of our Apollo contacts were added in the last 30 days?
- Search Apollo for fintech companies in Germany with 11-50 employees.
- List our accounts in the 'Negotiation' stage, sorted by last activity.
- Find people with the title 'Head of Data' at companies on these domains.
How it works
Three steps to get started
Connect Apollo.io to Sequel
In your Sequel dashboard, go to Connections and add Apollo.io. Sequel handles authentication and schema discovery automatically.
Add Sequel to the agent
Copy the Sequel MCP configuration into Codex's settings file (shown below). Swap in your API key from Settings → API Keys.
Ask Codex about your data
Restart Codex and start asking questions. "Find VPs of Sales at SaaS companies in the US with 50-200 employees." — and get a real answer backed by live Apollo.io data.
Why Codex
What Codex does with your Apollo.io data
Grounded answers from real data
Codex with Sequel queries your actual databases before generating code or explanations. Every schema reference, column name, and data shape is verified against what's really there.
Terminal-native data access
No context switching — Codex can pull database data mid-session to inform code generation, write migrations based on actual schemas, and validate assumptions without leaving the terminal.
Agentic data workflows
Codex's multi-step agent can chain Sequel tool calls together: discover schema, sample data, run analysis, then generate code — all in one automated flow.
Configuration
Add Sequel to Codex
Place this in ~/.codex/config.yaml and replace sql_your_api_key with a key from Settings → API Keys.
~/.codex/config.yaml
mcp_servers:
sequel:
type: http
url: https://api.sequel.sh/mcp
headers:
Authorization: "Bearer sql_your_api_key"Install
Install Apollo.io MCP in Codex
Pick your app and Sequel installs itself: a one-click link where the client supports it, that client’s own few steps where it doesn’t. Every route signs in with your Sequel account over OAuth, so there is no API key to copy and nothing to keep in sync.
Already have an MCP client?
https://api.sequel.sh/mcp
Add it as a remote (streamable HTTP) server and sign in when prompted. Skills come with it; nothing else to install. Manual setup per client
Add Sequel to Codex
Terminal
codex mcp add sequel --url https://api.sequel.sh/mcp
- 1Run the command in your terminal. It writes the server to ~/.codex/config.toml.
- 2Run codex mcp login sequel and sign in in the browser.
- 3Start Codex and ask a question.
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Frequently asked questions
How do I connect Apollo.io to Codex?
You need two things: (1) connect Apollo.io to Sequel in your Sequel dashboard under Connections, and (2) add the Sequel MCP config to Codex using the setup shown above. Once both are done, Codex can query your Apollo.io data directly.
What Apollo.io data can Codex access?
Codex can access any data available through your Apollo.io connection in Sequel. Use Sequel's search tool to discover available metrics and dimensions, then execute queries to pull the data you need.
Is my Apollo.io data sent to Codex's servers?
Query results are returned to Codex as context within your conversation. Only the data you explicitly ask about is retrieved. Sequel never stores your query results permanently — they exist only for the duration of the tool call.
Do I need a Sequel account?
Yes. You need a Sequel account to connect Apollo.io and generate an API key. Sign up free at sequel.sh — no credit card required. Then create a connection to Apollo.io and generate an API key from Settings → API Keys.
Can I connect multiple Apollo.io accounts?
Yes. Sequel supports multiple connections of the same type. If you have multiple Apollo.io accounts or properties, add each as a separate connection in Sequel. Codex will be able to query all of them.
How do I configure Sequel for Codex CLI?
Add the Sequel MCP server to ~/.codex/config.yaml as shown above. Create the file if it doesn't exist. Replace `sql_your_api_key` with a real key from Settings → API Keys, then restart Codex.
Does Codex CLI support HTTP MCP servers?
Yes. Codex CLI supports MCP over HTTP (Streamable HTTP transport). The `type: http` field in the config tells Codex to use this transport when connecting to Sequel.
Can I limit which databases Codex can access?
Sequel MCP is scoped to your organization's connected data sources. You can create separate API keys for different environments and revoke them at any time from Settings → API Keys.
Is this the same as the original OpenAI Codex model?
No — Codex CLI is OpenAI's agentic terminal coding tool, separate from the original Codex language model. It uses the latest OpenAI models (GPT-4o and o-series) with MCP tool support.
How do I connect Apollo.io to Sequel?
Create a master API key in Apollo under Settings → Integrations → API → Create New Key, enable master access, then paste the key into Sequel's Apollo connector and click Test. The People and Organization search endpoints require a master key.
Does Sequel consume my Apollo credits?
Only when you search Apollo's global database. The 'Search People' and 'Search Organizations' tools query Apollo's full prospect/company database and consume credits per Apollo's pricing. The 'Search Contacts' and 'Search Accounts' tools read your own saved CRM data and consume no credits.
Can Sequel change anything in Apollo?
No. The connector ships read-only search tools only — it cannot create, update, or delete contacts, accounts, sequences, or any other Apollo record.
Does Apollo's People Search return email addresses?
No. Apollo's people-search endpoint intentionally omits email addresses and phone numbers; obtaining those requires Apollo's separate enrichment endpoints, which this connector does not expose.
Connect Apollo.io to Codex today
Sign up free, connect your data sources, and start querying in minutes.