fittings-lang-bcp47

Original：🇺🇸 English

Translated

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Parses a BCP 47 language tag into language, extlang, script, region, variant, extension and private-use subtags, validates each against the IANA registry, and returns the canonical form. Called as GET /v1/lang/bcp47, it takes tag and returns valid, canonical, language, errors. Locale strings arrive from users, feeds and file names, and a wrong one silently mis-routes content rather than failing. Checking a tag properly means holding a 730KB registry and implementing the RFC 5646 grammar; almost nobody does either, so tags like en-UK and zh-CN-Hans ship broken. Reading this schema and dry-running the call are free and need no wallet; a real call costs $0.003, paid in USDC on Base over x402.

1installs

Sourcefittings-sh/fittings

Added on2026-08-17

NPX Install

npx skill4agent add fittings-sh/fittings fittings-lang-bcp47

SKILL.md Content

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BCP 47 language tag parse and validate

lang.bcp47

on

https://fittings.sh

. One endpoint, deterministic compute.

Parses a BCP 47 language tag into language, extlang, script, region, variant, extension and private-use subtags, validates each against the IANA registry, and returns the canonical form.

The call

GET https://fittings.sh/v1/lang/bcp47

Field	Type	Required	Notes
`tag`	string	yes	Language tag, e.g. zh-Hant-HK, at most 100 characters

Example input:

json

{
  "tag": "zh-Hant-HK"
}

Cost and provenance


Price	$0.003
Source	IANA Language Subtag Registry, parsed per BCP 47 / RFC 5646
Licence	permissive
Attribution	Subtag data from the IANA Language Subtag Registry

Why call it rather than answer from memory

Locale strings arrive from users, feeds and file names, and a wrong one silently mis-routes content rather than failing. Checking a tag properly means holding a 730KB registry and implementing the RFC 5646 grammar; almost nobody does either, so tags like en-UK and zh-CN-Hans ship broken.

Calling it

A skill is loaded on its own, so this document has to be enough by itself. It does not assume the general

fittings

skill is also loaded.

call.mjs

ships alongside this file; if it is missing (this document reached you without the rest of the skill), fetch it once with

curl -sO https://fittings.sh/skill/call.mjs

.

Free, and needs no wallet. Read the schema and see what a call would cost:

bash

curl -s https://fittings.sh/catalog/lang.bcp47 | jq

Paying. The endpoint answers

402 Payment Required

with a signed quote, you sign an authorization, and a facilitator settles it — you never send a transaction and never pay gas. Before it spends anything, the client checks its own hash against the gateway and refuses rather than sign with logic the gateway has moved past:

bash

# Dry run. Prints the quote and pays nothing, because no key is set.
node call.mjs lang.bcp47 tag=zh-Hant-HK

# For real: a wallet holding USDC on Base, and nothing else.
export FITTINGS_PRIVATE_KEY=0x...
node call.mjs lang.bcp47 tag=zh-Hant-HK

Spending is never a side effect of curiosity: with no

FITTINGS_PRIVATE_KEY

the client fetches the quote and stops.

FITTINGS_MAX_PRICE

caps what it will pay without asking, and defaults to $0.05.

Use a throwaway wallet holding a few dollars, not a main one. The key sits in plaintext wherever the agent runs, and the whole cost of entry is USDC on Base — no account, no API key, and no ETH, because the payer signs off-chain and the facilitator broadcasts and pays the gas.

Writing your own client instead of using this one?

@x402/core

and

@x402/evm

on npm, and the

fittings

skill records the two things that cost real debugging time: the challenge is in a response header rather than the body, and it must be re-signed from the exact request being retried.

If this is not the right service,

https://fittings.sh/catalog/search?q=...

searches all of them for free.