Audit an MTA-STS policy against the MX hosts it is meant to authorise
Audit an MTA-STS policy against the MX hosts it is meant to authorise. Reports an MX host no pattern matches, which under enforce mode refuses every message to that host; testing or none mode, where nothing is enforced; a max_age under a day, where a receiver that cannot fetch the policy stops honouring it almost immediately; and a DNS record with no id, without which a cached policy is never refreshed.
Answers HTTP 429 without x402 payment termsour last check, 2026-10-04
0 of 1checks answered this week
n/amedian answer time
$0.16listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.zfinia.com/x402/v1/mta-sts-policy-audit
| Category | Code and developer |
|---|---|
| Provider host | api.zfinia.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-04 | no x402 terms | 429 | 233 ms |
Example input (from the provider)
{
"body": {
"dns_record": "v=STSv1;",
"domain": "example.test",
"mx_hosts": [
"mx1.vendor.test",
"mx2.vendor.test",
"backup-mx.other-vendor.test"
],
"policy": "version: STSv1\nmode: testing\nmx: *.vendor.test\nmax_age: 3600"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"dns_record": {
"maxLength": 4096,
"type": "string"
},
"domain": {
"maxLength": 253,
"type": "string"
},
"mx_hosts": {
"items": {
"maxLength": 253,
"type": "string"
},
"maxItems": 200,
"minItems": 1,
"type": "array"
},
"policy": {
"maxLength": 4096,
"type": "string"
}
},
"required": [
"domain",
"policy"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}