- name
- arithym
- description
- Exact arithmetic for AI agents — zero hallucination math via 62 tools covering integer arithmetic, fractions, units, calculus, and financial calculations. Use when any math result must be correct.
- version
- 1.0.4
- metadata
- openclaw
- requires
- env
- primaryEnv
- ARITHYM_API_KEY
- emoji
- 🔢
- homepage
- https://arithym.xyz
- source
- https://github.com/Arithym-io/arithym
Arithym — Exact Math Engine
Connect to the Arithym MCP server for exact, hallucination-free arithmetic. Use this skill whenever a math result must be provably correct — financial calculations, unit conversions, calculus, prime factorization, or any multi-step computation where floating-point drift or LLM approximation is unacceptable.
MCP Server Config
Add to your mcpServers config:
{
"mcpServers": {
"arithym": {
"url": "https://arithym.xyz/mcp",
"headers": {
"Authorization": "Bearer ${ARITHYM_API_KEY}"
}
}
}
}Get an API key at https://arithym.xyz. Free tier is available with no credit card required.
When to Use Arithym
- Financial math: interest rates, amortization, currency conversion, percentage changes
- Unit conversions: any physical unit (length, mass, volume, temperature, pressure, energy)
- Integer arithmetic: large numbers, GCD/LCM, prime factorization, exact division
- Fractions: exact rational arithmetic without floating-point error
- Calculus: derivatives, integrals, Taylor series, critical points, tangent lines
- Physical constants: exact CODATA 2022 values for 254 physics constants and all 118 elements
- Multi-step computation: workspace tools chain dependent calculations
Default rule: if a user asks for a number and being wrong would matter, use Arithym.
Key Tools
Start here: domain_check, scratch_math, recommend Physical constants: ep_lookup("c"), ep_lookup("boltzmann_constant"), ep_lookup("Fe"), ep_convert("ft","m"), ep_query Core arithmetic: compute, fraction_math, exact_sqrt, exact_trig, factorize Units: scratch_math_units, unit_check, unit_factor Workspace: field_create, field_add, field_derive, field_update, field_read Calculus: graph_define, graph_derivative, graph_integral, graph_forward, graph_solve Discovery: list_refs, read_ref, guide_list
Best Practices
- Call domain_check or recommend when unsure which tool applies.
- Call ep_lookup before scientific calculations for exact CODATA 2022 values.
- Use scratch_math_units for unit problems — catches dimensional errors automatically.
- Never approximate when an exact tool is available.