Tools your AI calls instead of burning expensive tokens.
765 ready-made tools for CSV, JSON, text, dates and exact math. Your AI runs one and gets the same answer every time, instead of writing and debugging code. Free. No sign-up needed.
https://computefirst.net/mcp
In Claude Code: claude mcp add --transport http computefirst https://computefirst.net/mcp. Setup for Claude, Codex, Cursor, Gemini CLI and VS Code.
765 tools, no key needed.
Public verified savings by model
Public verified savings are currently unavailable.
Only verified whole-task comparisons marked for public inclusion are shown. Client estimates and private comparisons are excluded. Model tokenizers differ; these counts are not equivalent units or money saved.
| Model | Comparisons | Input | Cached input | Output | Net tokens |
|---|
Give us a little data, get more value.
Everything works without an account. If you want more, each small piece of data unlocks something concrete, and none of it is ever required.
We build tools so your tokens go to your mission.
| Your AI shares | It gets |
|---|---|
| Nothing | Every tool, free: 2,000 calls a day per network, shared by everyone on it |
Its model and its own token estimate, with report_savings | That estimate's dollar value at list price, with running totals once signed in |
An email, with sign_in | A 90-day key with saved tools, history and its own 5,000 calls a day |
A tool it could not find, with request_tool | We build it; leave an email for one message when it ships |
What happens when your AI uses it
- It searches in plain English, for example “compare two CSV exports and list the changed rows”.
- It reads the tool’s contract and runs it with exact JSON input.
- It gets a repeatable result back and carries on with your task.
Known tools run directly, up to 20 in one batch. Plain HTTP works too, with no key. HTTP reference.
POST /v1/tools/csv-to-json/versions/1.0.0/execute
{"csv": "name,city\nAda,London\n"}
200 OK
{"result": [{"name": "Ada", "city": "London"}]}What is in the catalog
Dates and times are UTC and ISO 8601. Every tool has a public page with its contract and an example. Browse all 765 tools.
- Identifiers & check digits 40
Validate and parse bank, product, publication, transport and national identifiers with explicit coverage. - Hashing & signatures 45
Compute and verify digests, HMACs, webhook signatures, key derivation and integrity proofs. - Money & pricing 21
Exact decimal arithmetic, rounding, allocation, taxes, invoices and supplied exchange rates. - Financial calculations 20
Cash flows, bond yields, loan schedules, day counts and time value of money. - CSV & tables 44
Convert, join, filter, sort, reconcile and compare CSV tables. - Structured formats 46
Structured data conversion and validation. - JSON & JSONL 52
Diff, patch, query, join, group and validate JSON documents and arrays. - Text 58
Compare texts, work with lines, patches, merges and Unicode details. - Sequences & diffs 16
Edit scripts, longest common subsequences, hunks and three-way merges. - Dates & times (UTC, ISO 8601) 55
Add, compare, convert and bucket calendar dates, durations and UTC timestamps. - Numbers & math 147
Exact math and evidence checks. - Vectors & matrices 27
Exact vector and matrix arithmetic: products, norms, determinants, inverses and linear systems. - Units & sizes 16
Convert, add and compare lengths, areas, volumes, speeds, pressures, temperatures and byte sizes. - Graphs & scheduling 20
Topological sort, cycles, paths, reachability and task schedules. - File paths (lexical) 20
Normalize, join, match and group path strings without touching a filesystem. - Forms 5
Compare form definitions, answers and response sets. - Encoding & checksums 26
Base encodings, UTF-8, hex bytes, varints and non-cryptographic checksums. - URLs & IP addresses 44
Parse, build and normalize URLs and query strings; IPv4 and IPv6 addresses, CIDR blocks and subnets. - Developer tools 14
Inspect developer protocols, configuration, SQL statements and command-line representations. - Optimization & voting 6
Solve bounded optimization, assignment, scheduling, voting and Pareto-front problems. - Geometry, location & color 10
Measure and classify polygons, geohashes and accessible color contrast. - Communications 18
Messages, DNS wire data and email addresses. - Versions & config 7
Semantic version ranges and sorting; .env parsing and merging. - Other utilities 8
More deterministic helpers.
Limits and privacy
Free within daily limits that protect shared capacity: 2,000 executions per network without a key, shared by everyone on that network, 7,500 per hosted connector platform (claude.ai, ChatGPT) and 10,000 for all of them together, shared by their users, 5,000 per email sign-in key, and 20 tools per batch, all within shared daily pools. Over a limit the answer is HTTP 429 with the time to retry. Limits.
For every call we record what it was (tool, sizes, timing, calling software, country and a network hash that changes monthly) and the text of searches, with secrets and email addresses removed; never the content of calls made without a key. Privacy policy · Terms.