fittings-text-char-edit

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Original

English

🇨🇳

Translation

Chinese

Exact character-position string edit

精确字符位置字符串编辑

text.char-edit

https://fittings.sh

. One endpoint, deterministic compute.

Insert, delete, replace, extract, locate or measure at exact character offsets, counting by grapheme, code point or UTF-16 unit, with the affected range reported in both the chosen unit and UTF-16.

text.char-edit

托管于

https://fittings.sh

。单接口，确定性计算。

可在精确的字符偏移位置执行插入、删除、替换、提取、定位或测量操作，支持按grapheme、code point或UTF-16单位计数，受影响范围会同时以所选单位和UTF-16单位返回。

The call

调用方式

POST https://fittings.sh/v1/text/char-edit

Field	Type	Required	Notes
`text`	string	yes	Text to operate on, 20000 UTF-16 units or fewer
`op`	string	yes	insert \| delete \| replace \| extract \| find \| measure
`unit`	string	no	grapheme \| codepoint (default) \| utf16
`index`	number	no	insert: offset to insert before
`start`	number	no	delete, replace, extract: first offset in the range
`end`	number	no	delete, replace, extract: offset just past the range
`value`	string	no	insert, replace: text to put in, 5000 UTF-16 units or fewer
`find`	string	no	find: substring to locate
`from`	number	no	find: offset to start searching at, default 0

Example input:

json

{
  "text": "The quick brown fox",
  "op": "replace",
  "unit": "codepoint",
  "start": 4,
  "end": 9,
  "value": "slow"
}

POST https://fittings.sh/v1/text/char-edit

字段	类型	是否必填	说明
`text`	string	是	要操作的文本，最多20000个UTF-16单位
`op`	string	是	insert \| delete \| replace \| extract \| find \| measure
`unit`	string	否	grapheme \| codepoint（默认）\| utf16
`index`	number	否	insert：插入位置的偏移量（插入到该位置之前）
`start`	number	否	delete、replace、extract：范围的起始偏移量
`end`	number	否	delete、replace、extract：范围的结束偏移量（不包含该位置）
`value`	string	否	insert、replace：要插入/替换的文本，最多5000个UTF-16单位
`find`	string	否	find：要定位的子字符串
`from`	number	否	find：搜索的起始偏移量，默认值为0

示例输入：

json

{
  "text": "The quick brown fox",
  "op": "replace",
  "unit": "codepoint",
  "start": 4,
  "end": 9,
  "value": "slow"
}

Metered

计量方式

The 402 quotes a ceiling — the price of the declared cap, 20000 characters — and settlement is for what the call actually used. A small request settles for less than it was quoted, so read the quote as an upper bound rather than a price.

402响应会给出一个上限报价——即声明的最大容量（20000字符）对应的价格——而最终结算则按调用实际使用的字符数计算。小请求的结算金额会低于报价，因此请将报价视为上限而非固定价格。

Cost and provenance

费用与来源


Price	$0.003 per call, metered per characters
Source	none (pure compute)
Licence	none-needed


价格	每次调用0.003美元，按字符数计量
数据源	无（纯计算服务）
许可证	无需许可证

Why call it rather than answer from memory

为何调用该服务而非自行实现

Character-indexed string edits are a measured failure mode for language models (arXiv:2409.15452), and the index a model reasons about is rarely the index a runtime uses: a skin-toned emoji is one grapheme, two code points and four UTF-16 units, so an offset is wrong until the unit is named.

基于字符索引的字符串编辑是语言模型的一个已被证实的失效场景（arXiv:2409.15452），且模型推理时使用的索引与运行时使用的索引往往不同：一个带肤色的emoji是1个grapheme、2个code point和4个UTF-16单位，因此在明确计数单位前，偏移量是不准确的。

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/text.char-edit | 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

该技能是独立加载的，因此本文档本身包含所有必要信息，无需依赖通用的

fittings

技能。

call.mjs

文件与本文档一同提供；如果缺失（本文档单独发送给您），可通过以下命令获取：

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

。

免费操作，无需钱包。查看接口schema并了解调用费用：

bash

curl -s https://fittings.sh/catalog/text.char-edit | jq

付费调用。接口会返回

402 Payment Required

响应及签名报价，您需签署授权信息，由服务商完成结算——您无需发送交易，也无需支付gas费用。在产生费用前，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.

预演。仅打印报价，无需支付，因为未设置密钥。

node call.mjs text.char-edit text="The quick brown fox" op=replace unit=codepoint start=4 end=9 value=slow

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

实际调用：使用持有Base网络USDC的钱包，无需其他资产。

export FITTINGS_PRIVATE_KEY=0x... node call.mjs text.char-edit text="The quick brown fox" op=replace unit=codepoint start=4 end=9 value=slow


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 text.char-edit text="The quick brown fox" op=replace unit=codepoint start=4 end=9 value=slow


仅出于好奇的操作不会产生费用：未设置`FITTINGS_PRIVATE_KEY`时，客户端只会获取报价后停止操作。`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，不要使用主钱包**。密钥会以明文形式存储在代理运行的环境中，入门成本仅为Base网络上的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费用。

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`技能记录了两个耗费大量调试时间的要点：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。

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