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fittings-valid-lei

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🇺🇸

Original

English
🇨🇳

Translation

Chinese

LEI validation

LEI校验

valid.lei
on 
https://fittings.sh
. One endpoint, deterministic compute.
Validate an ISO 17442 Legal Entity Identifier checksum and extract its issuing LOU prefix.
valid.lei
部署于 
https://fittings.sh
，为单一接口，采用确定性计算。
校验ISO 17442法律实体标识符（LEI）的校验和，并提取其发行方LOU前缀。

The call

调用方式

GET https://fittings.sh/v1/valid/lei
FieldTypeRequiredNotes
lei
stringyes
Example input:
json
{
  "lei": "549300MLUDYVRQOOXS22"
}
GET https://fittings.sh/v1/valid/lei
字段类型是否必填说明
lei
string是
示例输入：
json
{
  "lei": "549300MLUDYVRQOOXS22"
}

Cost and provenance

费用与来源

Price$0.003
Sourcenone (pure compute)
Licencenone-needed
价格0.003美元
数据源无（纯计算）
授权无需授权

Why call it rather than answer from memory

为何调用该接口而非本地计算

Observed on-chain demand: a compliance agent resolving a counterparty needs to know an LEI is well-formed before spending a lookup against a registry.
链上需求场景：合规Agent在调用注册中心查询交易对手信息前，需要先确认LEI格式是否合规。

Calling it

调用指南

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/valid.lei | 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
undefined
该Skill为独立加载，因此本文档可单独使用，无需依赖通用的
fittings
Skill。
call.mjs
文件随本文档一同提供；若缺失（你仅收到本文档而未获取Skill的其余部分），可通过以下命令一次性获取： 
curl -sO https://fittings.sh/skill/call.mjs
。
免费且无需钱包。查看接口schema并了解调用费用：
bash
curl -s https://fittings.sh/catalog/valid.lei | jq
付费调用。接口会返回
402 Payment Required
状态码及签名报价，你需签署授权信息，由服务商完成结算——你无需发送交易，也无需支付Gas费。在产生任何费用前，客户端会将自身哈希与网关进行校验，若网关逻辑已更新则会拒绝签署：
bash
undefined

Dry run. Prints the quote and pays nothing, because no key is set.

试运行。仅打印报价，无需支付费用，因为未设置密钥。

node call.mjs valid.lei lei=549300MLUDYVRQOOXS22
node call.mjs valid.lei lei=549300MLUDYVRQOOXS22

For real: a wallet holding USDC on Base, and nothing else.

实际调用：使用在Base链上持有USDC的钱包，无需其他资产。

export FITTINGS_PRIVATE_KEY=0x... node call.mjs valid.lei lei=549300MLUDYVRQOOXS22

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.
export FITTINGS_PRIVATE_KEY=0x... node call.mjs valid.lei lei=549300MLUDYVRQOOXS22

仅出于好奇不会产生费用：未设置`FITTINGS_PRIVATE_KEY`时，客户端仅获取报价后即停止。`FITTINGS_MAX_PRICE`用于设置无需确认的最高支付限额，默认值为0.05美元。

**请使用仅持有少量资金的临时钱包，勿使用主钱包**。密钥会以明文形式存储在Agent运行的环境中，参与该服务仅需在Base链上持有USDC——无需账户、API密钥或ETH，因为付款方进行链下签名，由服务商负责广播交易并支付Gas费。

不想使用该客户端，希望自行开发？可使用npm上的`@x402/core`和`@x402/evm`包，`fittings` Skill记录了两个容易耗费调试时间的要点：挑战信息位于响应头而非响应体中，且必须针对重试的精确请求重新签名。

若该服务不符合你的需求，可通过`https://fittings.sh/catalog/search?q=...`免费搜索所有可用服务。