# SYNTHORA Deliverability

> SYNTHORA Deliverability is a paid API for AI agents from deliverability.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Audits a domain's email deliverability by checking SPF, DKIM, DMARC, BIMI, MX, and PTR records and returning a spam score with prioritized fixes.

## Facts

- Endpoint: POST https://deliverability.hergertsynthora.com/service?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-deliverability-e812c3de
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bAsXsTKZ93jQ0yhbXLcEi

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability synthora-deliverability-e812c3de -d '<json body>'
```

Example prompt: Can you run a full email deliverability audit on sendgrid.com and tell me the spam score, whether DMARC is set to reject, and what I should fix first?

## When to prefer this

Choose this endpoint when you need a comprehensive, all-in-one email authentication audit covering SPF, DKIM, DMARC, BIMI, MX, and PTR in a single DNS-only call with a spam score and prioritized remediation list. Prefer it over manual per-record DNS lookups when you want a verdicted, scored summary rather than raw DNS data. It is especially useful before email campaigns, when troubleshooting inbox placement, or when onboarding a new sending domain.

## Known failure modes

- Domain not found or non-existent DNS — returns error or empty record sets
- Malformed domain input — validation error returned
- DKIM selectors unavailable or not published — partial result with missing DKIM data
- Timeout on DNS resolution for slow nameservers — may return incomplete results
- Rate limit exceeded without wallet header — payment required response

## How this service works

Audit a domain's email deliverability and sender reputation. Checks SPF, DKIM selectors, DMARC policy strength (reject/quarantine/none), BIMI, MX and PTR records, returning a spam score and prioritized fixes. Use it to assess inbox placement, email authentication and domain reputation before sending. Deterministic DNS-only, Ed25519-signed. 0.001 USDC on Base. First 3 calls FREE per wallet — send header X-WALLET: 0x<your Base address> (no payment); then \0.001 USDC per call.

## Output

A JSON object containing the domain's MX records, SPF configuration, DKIM selector details, DMARC policy level (reject/quarantine/none), BIMI status, PTR records, a numeric spam score (0-100), an overall verdict (e.g. 'good'), and a prioritized list of actionable recommendations to improve deliverability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "description": "Domain or email address to audit"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "deliverability",
  "result": {
   "mx": [],
   "spf": {},
   "dkim": {},
   "dmarc": {},
   "score": 100,
   "domain": "example.com",
   "verdict": "good",
   "recommendations": []
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-deliverability-e812c3de/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from deliverability.hergertsynthora.com](https://www.zero.xyz/host/deliverability.hergertsynthora.com/llms.txt)