Claude for Finance Analysis: a Practical Guide
Use Claude to analyze stocks and options with delayed market data: a free no-key API, three ways to connect it, and prompts that get grounded answers.
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Claude usage limits: what to do when you hit one
Switching models only fixes a model family limit. How Claude subscription session and weekly limits differ from API 429 rate limits, and what to do next.
Claude API auth: key, Bedrock, Vertex, Foundry
Four ways to authenticate a Claude API client on a VPS: an Anthropic key, AWS IAM on Bedrock, Google ADC on Vertex, Entra on Foundry, plus safe storage.
Why is Claude so expensive? The token math
Output tokens cost five times input, and every turn re-reads your whole context. See the arithmetic on one real session, and the four levers that cut it.
Input vs Output Tokens: Claude's Cost Gap
Claude output tokens cost five times input. Here is why decoding is slower than prefill, and what that asymmetry does to a real agent bill each month.
The Ollama API and port 11434 explained
Curl your Ollama server on port 11434, read what a refused connection means, tour the API endpoints, and set OLLAMA_HOST without exposing the box.
Query a free market data API from a VPS
Pull US daily market data into SQLite on your VPS with a free API key: read the schema, send one SQL query, handle quota errors, and run it on a systemd timer.
AI agent cost control on an always-on VPS
An unattended agent bills every loop with nobody watching. Hard caps, task budgets, prompt caching, batching, and the usage fields that show the spend.
Your Ollama API has no password
The Ollama server ships with no authentication, so anything that reaches port 11434 can run your models and pull new ones. The three fixes, in order.
Self-host HarnessRouter: one agent API
Run Codex, Claude Code and Hermes behind one self-hosted API. The exact Docker deploy, the loopback bind, the default login you must change, and TLS access.
Claude prompt caching: the break-even math
Cache writes cost 1.25x and reads 0.1x or less, so a Claude prefix pays back on its second use. Derive your own break-even, then prove it from the API.
Anthropic Claude API: no free tier, but a credit
The Claude API has no free tier. New accounts get a small signup credit, and several parts cost nothing. October 2026 rates plus a worked cost for a first app.
Self-hosted API mocking and testing on a VPS
Mock servers and API test runners do different jobs. Run both on your own box: WireMock stubs in git, Hurl suites in CI, and reports that survive a rebuild.