# sigtap Outreach API
> Paid micro-API for outreach agents. One signature per call. No keys. x402 (USDC on Base).

## Paid endpoints

## GET /deliverability

Price: $0.003 per call, settled in USDC on Base via x402. Network: eip155:8453.

Email deliverability check: SPF, DKIM, DMARC and MX record audit for a sending domain.

Params:
- domain (string, required): Domain to audit

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/deliverability?domain=Sending%20domain%20to%20audit%2C%20e.g.%20openai.com
```

Example response:

```json
{
  "domain": "example.com",
  "spf": {
    "found": true,
    "record": "v=spf1 ...",
    "all_in_one": true,
    "issue": null
  },
  "dmarc": {
    "found": true,
    "policy": "none"
  },
  "dkim": {},
  "checks": {},
  "verdict": "ready-to-send"
}
```

## GET /grade

Price: $0.005 per call, settled in USDC on Base via x402. Network: eip155:8453.

Cold email grader: score an email 0-100 with concrete fixes (subject line, body, spam risk).

Params:
- subject (string, optional): Email subject line to grade
- body (string, optional): Plain-text email body to grade

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/grade?subject=Email%20subject%20line&body=Plain-text%20email%20body
```

Example response:

```json
{
  "score": 82,
  "grade": "B",
  "checks": []
}
```

## GET /template

Price: $0.01 per call, settled in USDC on Base via x402. Network: eip155:8453.

Cold email generator: personalized outreach email from proven templates (founder, agency, freelance).

Params:
- persona (string, optional): founder | agency | freelancer
- offer (string, optional): What you are offering
- name (string, optional): Recipient name for personalization
- company (string, optional): Recipient company for personalization

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/template?persona=founder%20%7C%20agency%20%7C%20freelancer&offer=What%20you%20are%20offering&name=Recipient%20name&company=Recipient%20company
```

Example response:

```json
{
  "subject": "...",
  "body": "...",
  "cadence_tips": []
}
```

## GET /tools/hash

Price: $0.0005 per call, settled in USDC on Base via x402. Network: eip155:8453.

Hash a string: sha256, sha512, sha1, md5, CRC32, base64 checksum - crypto hash API for UTF-8 text.

Params:
- text (string, required): UTF-8 text to hash

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/hash?text=UTF-8%20text%20to%20hash
```

Example response:

```json
{
  "length": 5,
  "byte_length": 5,
  "sha256": "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
  "sha384": "59e1748777448c69de6b800d7a33bbfb9ff1b463e44354c3553bcdb9c666fa901a1a751c9fb642405954b1ed74a74210",
  "sha512": "9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2dff72519673ca72323c3d99ba5c11d7c7acc6e14b8c5da0c4663475c2e5c3adef46f73bcdec043",
  "hex": "68656c6c6f",
  "base64": "aGVsbG8=",
  "base64url": "aGVsbG8",
  "crc32": "3610a686"
}
```

## GET /tools/jwt-decode

Price: $0.001 per call, settled in USDC on Base via x402. Network: eip155:8453.

JWT decoder: decode a JSON web token header and payload, with safety flags (never verifies the signature).

Params:
- token (string, required): JWT to decode

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/jwt-decode?token=JWT%20to%20decode%20(header.payload.signature)
```

Example response:

```json
{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "1",
    "exp": 1735689600
  },
  "signature": {
    "present": true
  },
  "flags": {
    "alg_none": false,
    "weak_alg": false,
    "exp_missing": false,
    "expired": true
  }
}
```

## GET /tools/uuid

Price: $0.0005 per call, settled in USDC on Base via x402. Network: eip155:8453.

UUID generator: batch unique ids - UUIDv4, UUIDv7, ULID or nanoid - random ID API.

Params:
- count (integer, optional): How many IDs, 1-100 (default 1)
- version (string, optional): v4 | v7 | ulid | nanoid (default v4)

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/uuid?count=How%20many%20IDs%2C%201-100%20(default%201)&version=v4%20%7C%20v7%20%7C%20ulid%20%7C%20nanoid%20(default%20v4)
```

Example response:

```json
{
  "version": "v7",
  "count": 2,
  "ids": [
    "01934fe8-1a2b-7c3d-8e4f-5a6b7c8d9e0f",
    "01934fe8-1a2b-7c3d-8e4f-5a6b7c8d9e10"
  ]
}
```

## GET /tools/slug

Price: $0.001 per call, settled in USDC on Base via x402. Network: eip155:8453.

Slug generator: url-safe slug from unicode text, latin and Cyrillic transliteration.

Params:
- text (string, required): Text to slugify
- maxlength (integer, optional): Max slug length 1-500 (default 60)

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/slug?text=Text%20to%20slugify&maxlength=Max%20slug%20length%201-500%20(default%2060)
```

Example response:

```json
{
  "text": "Привет, Мир!",
  "slug": "privet-mir",
  "length": 11,
  "maxlength": 60,
  "warnings": []
}
```

## GET /tools/json

Price: $0.001 per call, settled in USDC on Base via x402. Network: eip155:8453.

JSON tools: flatten JSON to dot paths, or convert JSON rows to CSV online.

Params:
- data (string, required): JSON string (urlencoded)
- mode (string, optional): flatten | csv (default flatten)

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/json?data=JSON%20string%20(urlencoded)&mode=flatten%20%7C%20csv%20(default%20flatten)
```

Example response:

```json
{
  "mode": "flatten",
  "leaf_count": 2,
  "flattened": {
    "user.name": "Ada",
    "tags.0": "x"
  }
}
```

## GET /tools/regex

Price: $0.001 per call, settled in USDC on Base via x402. Network: eip155:8453.

Regex tester: test a regular expression - matches, groups, count and backtracking risk check.

Params:
- pattern (string, required): Regular expression
- text (string, required): Text to search
- flags (string, optional): Regex flags (subset of dgimsuy)

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/regex?pattern=Regular%20expression&text=Text%20to%20search&flags=Regex%20flags%20(subset%20of%20dgimsuy)
```

Example response:

```json
{
  "pattern": "\\d+",
  "count": 2,
  "matches": [
    {
      "index": 0,
      "match": "42",
      "groups": []
    }
  ],
  "backtracking_risk": {
    "risk": "low",
    "reasons": []
  }
}
```

## GET /tools/crypto-price

Price: $0.002 per call, settled in USDC on Base via x402. Network: eip155:8453.

Crypto price API: BTC and ETH spot price from Coinbase with buy, sell and spread percent.

Params:
- from (string, required): Base asset code, e.g. BTC
- to (string, required): Quote asset code, e.g. USD

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/crypto-price?from=Base%20asset%20code%2C%20e.g.%20BTC&to=Quote%20asset%20code%2C%20e.g.%20USD
```

Example response:

```json
{
  "pair": "BTC-USD",
  "spot": 67123.45,
  "buy": 67150,
  "sell": 67090.1,
  "spread_pct": 0.0893
}
```

## GET /tools/domain-age

Price: $0.003 per call, settled in USDC on Base via x402. Network: eip155:8453.

Domain age checker: registration date, age in days and registrar via RDAP lookup.

Params:
- domain (string, required): Domain to look up

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/domain-age?domain=Domain%20to%20look%20up
```

Example response:

```json
{
  "domain": "example.com",
  "verdict": "registered",
  "registration_date": "1995-08-14T04:00:00Z",
  "age_days": 11000,
  "registrar": "RESERVED-Internet Assigned Numbers Authority",
  "registrar_url": null
}
```

## GET /tools/weather

Price: $0.001 per call, settled in USDC on Base via x402. Network: eip155:8453.

Weather API: current weather and next 3 hours temperature by lat, lon (open-meteo).

Params:
- lat (number, required): Latitude -90..90
- lon (number, required): Longitude -180..180

Example request:

```
GET https://sigtap-outreach-api.sigtap.workers.dev/tools/weather?lat=Latitude%20-90..90&lon=Longitude%20-180..180
```

Example response:

```json
{
  "current": {
    "temperature_2m": 21.3,
    "relative_humidity_2m": 48,
    "wind_speed_10m": 12.1,
    "weather_code": 2,
    "weather_description": "Partly cloudy"
  },
  "next_3h": [
    {
      "time": "2026-01-01T12:00",
      "temperature_2m": 21.8
    }
  ]
}
```


## Pay in one call (copy-paste)
Step 1: GET any paid path above -> 402 + PAYMENT-REQUIRED response header (base64 x402 v2 challenge: scheme exact, network eip155:8453, PayAI facilitator; payTo is inside the challenge).
Step 2: answer the challenge and retry the SAME GET; the easiest way is the official client (step 3) - it reads the challenge, signs an EIP-3009 transfer (USDC on Base) and sends X-PAYMENT for you.
Step 3 (copy-paste, one round-trip, no keys/accounts - wallet is the account):

```js
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(privateKeyToAccount(PRIVATE_KEY)) }]
});
const res = await fetchWithPayment(`${PAYBASE}/tools/uuid?count=3&version=v7`); // $0.0005
console.log(res.status, await res.json()); // 200 { ids: [...] }; settlement comes back in the payment-response header
```

Free check before any wallet action: GET https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/uuid?version=v7 -> 200 truncated sample of the same output.
MCP twin (same tools over MCP): https://sigtap-mcp.sigtap.workers.dev/mcp - see its /llms.txt for a ready mcpServers config.

## Free endpoints

- GET / - this catalog (with prices)
- GET /score-preview?subject=... - free length/subject-only preview of the grader
- GET /hash-preview?text=... - free hash preview (sha256 + crc32), first 1000 chars; the paid /tools/hash has no length limit
- GET /preview/<paid-path> - free truncated sample of ANY paid tool (e.g. /preview/tools/hash?text=...)
- GET /health - liveness
- GET /llms.txt - short catalog
- GET /llms-full.txt - this document
- GET /openapi.json - full OpenAPI spec with x-payment-info

Buy the full kit: https://unnamedaiagent.github.io/pitchpilot-kit/