io.github.zvmzaretskyPublished by GitHub account zvmzaretskyv1.0.0Updated Oct 24, 2026
13 deterministic agent utilities: timezone, cron, RRULE, currency, regex, diff, hashing & more.
The publisher's own server: Tally
A remote MCP server offering 13 deterministic utilities — unit conversion, hashing, encoding, IDs, regex, time zones, cron, RRULE, currency, diff, JSON Schema —
Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.
Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.
Read https://sourceweft.com/mcp/io.github.zvmzaretsky%2Futility-belt/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.Add this to your client's mcpServers config.
{
"mcpServers": {
"fabtally-utility-belt": {
"type": "http",
"url": "https://belt.fabtally.com/mcp"
}
}
}The deterministic micro-utilities AI agents call constantly, as an MCP server (stdio + streamable-HTTP) and a pay-per-call HTTP API. One reliable bundle instead of thirteen flaky npm deps.
convert, text, hash, encode, id, regex.timezone, cron, rrule, currency, diff,
jsonschema, datemath. With no payment a paid tool returns the decoded x402 402 challenge
(price / network / asset / payTo) so an agent can pay and retry with x_payment. Humans can instead
prepay by card and use an X-FabTally-Key credit key against the HTTP API.This server holds no private key. It fronts https://belt.fabtally.com. Every utility is a pure,
deterministic function with strict input validation; bad input → 400, never charged; nothing is stored.
Or clone and run: node index.js (speaks MCP over stdio).
Hosted: https://belt.fabtally.com/mcp. Or self-host: MCP_HTTP_PORT=8108 node http.js.
FABTALLY_BELT_BASE — API base (default https://belt.fabtally.com).A paid tool with no x_payment returns:
Build an x402 payment authorization (EIP-3009 transferWithAuthorization to payTo) for the accepts
entry and call the tool again with the token in x_payment. amount is atomic USDC (1000 = $0.001).
Deterministic. Stateless — no PII or request data stored. Receive-only wallet (no custody). Currency figures are reference/mid-market rates for informational use, not a dealable quote. MIT licensed.
Source: README.md at commit 50dae27
Unit conversion
FREE. Convert a value between units in the same dimension: length, mass, temperature, volume, data, time, area, speed, angle, pressure, energy. Deterministic. Args: value (number), from (unit), to (unit). e.g. {value:100, from:'c', to:'f'} or {value:1, from:'GiB', to:'MB'}. Different-dimension conversions 400.
torequiredfromrequiredvaluerequiredSlugify / case-convert / template-fill
FREE. Text transforms. op='slugify' -> URL slug; op is one of camel|pascal|snake|kebab|constant|dot|path|title|sentence|upper|lower for case conversion; op='template' fills {{placeholders}} from `data`. Args: op, text (for slugify/case), or template + data (for template).
oprequireddatatextstricttemplateseparatorHash / HMAC
FREE. Compute a cryptographic digest: sha256, sha512, sha384, sha1, md5, sha3-256, keccak256, ripemd160. Optional HMAC via hmac_key. Output hex (default), base64, or base64url. keccak256 also returns a 0x-form (handy for Ethereum). Args: algorithm, text (+ input_encoding utf8|hex|base64, output_encoding, hmac_key).
textrequiredhmac_keyalgorithmrequiredinput_encodingoutput_encodingEncode / decode (base64, hex, url, html)
FREE. Encode or decode text. op is one of base64-encode|base64-decode|base64url-encode|base64url-decode|hex-encode|hex-decode|url-encode|url-decode|html-encode|html-decode. Args: op, text.
oprequiredtextrequiredGenerate IDs (uuid v4/v7, ULID, nanoid)
FREE. Generate identifiers. kind is one of uuidv4|uuidv7|ulid|nanoid|hex|base64url|int. count up to 1000. nanoid takes `size`; hex/base64url take `bytes`. Uses a CSPRNG. Args: kind, count.
kindsizebytescountRegex test / match / extract / replace (safe)
FREE. Run a regular expression against input with catastrophic-backtracking protection (it runs in a killable worker with a hard timeout, so a pathological pattern returns a 400 instead of hanging). op is test|match|extract|replace. Args: pattern, input, flags (gimsuy), op, replacement (for replace).
opflagsinputrequiredlimitpatternrequiredreplacementTimezone / DST convert (paid $0.001)
PAID $0.001 (x402, USDC on Base). Convert an instant between IANA time zones with historically-correct DST. Returns converted datetime, UTC offsets, tz abbreviations, DST flags, and the offset difference. Args: datetime (ISO 8601 or epoch), from_zone, to_zone. Without payment returns the x402 challenge; pass x_payment to settle. Free teaser exists on the HTTP API at /v1/timezone/free.
to_zonerequireddatetimerequiredfrom_zonex_paymentCron -> next N runs + description (paid $0.001)
PAID $0.001. Parse a 5- or 6-field cron expression and return the next N run times plus a plain-English description. Args: expression, timezone (IANA, default UTC), count (default 5), from (ISO, optional). Without payment returns the x402 challenge; pass x_payment to settle.
fromcounttimezonex_paymentexpressionrequirediCal RRULE -> next N occurrences (paid $0.001)
PAID $0.001. Expand an iCal RRULE (RFC 5545) recurrence into its next N occurrences. Args: rrule (e.g. 'FREQ=WEEKLY;BYDAY=MO,WE;COUNT=10'), after (ISO, default now), count (default 5), timezone. Tip: include DTSTART for anchored series. Without payment returns the x402 challenge; pass x_payment.
aftercountrrulerequiredtimezonex_paymentLive currency convert (paid $0.001)
PAID $0.001. Convert an amount between currencies at reference/mid-market rates from a keyless public central-bank feed (ECB), cached. Informational, not a dealable quote. Args: amount, from, to (ISO-4217, e.g. USD, EUR, JPY). Without payment returns the x402 challenge; pass x_payment to settle.
torequiredfromrequiredamountrequiredx_paymentText diff (unified + structured) (paid $0.001)
PAID $0.001. Diff two texts: a unified patch, a structured op-list (add/remove/equal), and add/remove/hunk stats. Args: a, b, mode (lines|words|chars, default lines), context (default 3), label_a, label_b. Without payment returns the x402 challenge; pass x_payment to settle.
arequiredbrequiredmodecontextlabel_alabel_bx_paymentJSON-Schema (2020-12) validate + explain (paid $0.001)
PAID $0.001. Validate a value against a JSON Schema (draft 2020-12) and explain every error in plain English (which property, what was wrong, allowed values). Args: schema (object), data (any). Without payment returns the x402 challenge; pass x_payment to settle.
dataschemarequiredx_paymentDate math: durations & business days (paid $0.001)
PAID $0.001. Calendar date math. op='add'/'subtract' an ISO-8601 duration (P1Y2M10DT2H30M) to a date; op='diff' two datetimes into chosen units; op='business-add' add business days (configurable weekend + holidays); op='business-diff' count business days between two dates. Without payment returns the x402 challenge; pass x_payment to settle.
oprequiredtodatedaysfromunitsweekenddurationholidaystimezonex_payment100% of the applicable checks met
How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.
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// claude_desktop_config.json{ "mcpServers": { "fabtally-belt": { "command": "npx", "args": ["-y", "fabtally-belt-mcp"] } }}{ "payment_required": true, "http_status": 402, "challenge": { "x402Version": 2, "accepts": [ { "scheme": "exact", "network": "eip155:8453", "amount": "1000", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0x…" } ] } }