●

Email Auth Check (SPF/DMARC/DKIM)

Data PAYMENT-READY imported

payment-ready until 2026-09-11

imported from the x402 Bazaar, not submitted by the operator · own this service? claim it · or ask to be removed

Checks a domain's SPF, DMARC, DKIM and MX records and returns the parsed results as JSON, flagging common gaps such as SPF +all, more than 10 SPF DNS lookups, DMARC p=none and missing DKIM selectors.

Part of the x402 Atlas operator hub

Pay from $0.01 per request in USDC on Arbitrum One / Base / Polygon / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

BASE URL https://email-auth.use.x402atlas.com │ ENDPOINTS 1 │ NETWORK Arbitrum One / Base / Polygon / Solana │ ASSET USDC │ MEMBER SINCE 2026-07-20 │ MONITORED SINCE 2026-07-20

VERDICT

ranking generation 3

solid 89/100 #134 of 265 in Data by measured score

What the score read on this service: status online, 99.6% uptime 30d, 2538ms response p95, x402 compliance 14 of 14, $0.01 price against the category. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

It is a score inside Data, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 265 listings, this one among them. That set is wider than the 265 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

ALTERNATIVES IN DATA

Other Data services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).

Ranked alternative x402 services in the same category, with band, measured score, 30-day uptime and 30-day on-chain settlement volume
SERVICE	BAND	SCORE	UPTIME 30D	VOL 30D
AgentFund US Economic, SEC & On-Chain Data	strong	99	100%	---
API Acre	strong	99	99.7%	---
ThirdMade Shelf	strong	99	100%	---
WebberSites x402 Data API	strong	98	100%	---
ForgeMesh Utility APIs	strong	98	100%	---

5 of 264 other ranked services in Data · see the whole category

ASSESSMENT

updated 15m ago

The parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.

reliability 99.6%

uptime 24h: 100%
uptime 7d: 100%
uptime 30d: 99.6%
uptime 90d: 99.7%
response p95: 2538ms
avg response: 1280ms
total checks: 2,671

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.01 (p59 in Data)

price (min): $0.01
category percentile (min): p59 in Data
endpoints / prices: 1 / 1
model: flat
stability: 100%

risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age: 319d
registrar: Amazon Registrar, Inc.
hosting: custom
domain created: 2025-10-17

Identity facts, not a risk score.

traction ---

This service settles on a network x402-list does not measure yet, so on-chain volume is not counted here. Shown as unmeasured, not zero.

CHANGES

10 in 30d

Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.

changes schema changed 9d ago (10 in 30d)

schema changed · 9d ago

schema removed GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP","merchant":"x402Atlas","tier":"standard"}

schema added GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb","merchant":"x402Atlas","tier":"standard"}

schema changed · 9d ago

schema removed GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F","merchant":"x402Atlas","tier":"standard"}

schema added GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP","merchant":"x402Atlas","tier":"standard"}

schema changed · 10d ago

schema added GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F","merchant":"x402Atlas","tier":"standard"}

schema changed · 10d ago

schema removed GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88","merchant":"x402Atlas","tier":"standard"}

schema changed · 11d ago

schema added GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88","merchant":"x402Atlas","tier":"standard"}

schema changed · 12d ago

schema removed GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM","merchant":"x402Atlas","tier":"standard"}

schema changed · 12d ago

schema removed GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb","merchant":"x402Atlas","tier":"standard"}

schema added GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM","merchant":"x402Atlas","tier":"standard"}

schema changed · 12d ago

see all changes for this service

WHAT IT DOES

ai-derived

No AI synthesis has been produced for this service yet.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD	PATH	DESCRIPTION	PRICE	NETWORK	ASSET	402 CHANNEL
GET	/check		$0.01	Arbitrum One/Base/Polygon/Solana	USDC	header

1 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /check returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request

curl -i 'https://email-auth.use.x402atlas.com/check'

// 402 response (captured by monitor) · 1 payload · click to expand

[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "tier": "standard",
          "version": "2",
          "merchant": "x402Atlas"
        },
        "payTo": "0x3731f5C2c1835E3aCe2AC157c4e31b1cEA0CB0e0",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "tier": "standard",
          "version": "2",
          "merchant": "x402Atlas"
        },
        "payTo": "0x3731f5C2c1835E3aCe2AC157c4e31b1cEA0CB0e0",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:137",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "tier": "standard",
          "version": "2",
          "merchant": "x402Atlas"
        },
        "payTo": "0x3731f5C2c1835E3aCe2AC157c4e31b1cEA0CB0e0",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:42161",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "tier": "standard",
          "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
          "merchant": "x402Atlas"
        },
        "payTo": "ASt6xvRyQ7ntERsmcYVMdLqZvz1GEN8Fzexzq62tXrNQ",
        "amount": "10000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://email-auth.use.x402atlas.com/check",
      "tags": [
        "email",
        "spf",
        "dmarc",
        "dkim",
        "deliverability",
        "security"
      ],
      "mimeType": "application/json",
      "description": "Email authentication posture check: parses SPF, DMARC and DKIM plus MX for any domain and grades deliverability/anti-spoofing gaps (SPF +all, SPF >10 lookups, DMARC p=none, missing DKIM). Clean JSON for deliverability and security-ops automation.",
      "serviceName": "Email Auth SPF/DMARC/DKIM Check"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "domain": "example.com",
              "selector": "google"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "mx": [
                {
                  "host": "aspmx.l.google.com.",
                  "pref": 1
                }
              ],
              "spf": {
                "record": "v=spf1 include:_spf.google.com ~all",
                "mechanisms": [
                  {
                    "kind": "include",
                    "value": "_spf.google.com",
                    "qualifier": "+",
                    "causes_dns": true
                  },
                  {
                    "kind": "all",
                    "value": "",
                    "qualifier": "~",
                    "causes_dns": false
                  }
                ],
                "dns_lookups": 1,
                "all_qualifier": "~all"
              },
              "dkim": {
                "found": [
                  {
                    "record": "v=DKIM1; k=rsa; p=MIGfMA0GCSq...",
                    "selector": "google"
                  }
                ],
                "checked_selectors": [
                  "default",
                  "google",
                  "selector1",
                  "selector2",
                  "k1",
                  "dkim",
                  "mail"
                ]
              },
              "dmarc": {
                "pct": 100,
                "rua": [
                  "mailto:[email protected]"
                ],
                "ruf": [],
                "aspf": "s",
                "adkim": "s",
                "policy": "reject",
                "record": "v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; adkim=s; aspf=s",
                "subdomain_policy": ""
              },
              "domain": "example.com",
              "warnings": [],
              "queried_at": "2026-07-02T12:00:00Z",
              "accepts_mail": true
            }
          }
        },
        "tags": [
          "email",
          "spf",
          "dmarc",
          "dkim",
          "deliverability",
          "security"
        ],
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method"
              ],
              "properties": {
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "domain"
                  ],
                  "properties": {
                    "domain": {
                      "type": "string",
                      "pattern": "^[A-Za-z0-9-]{1,63}(\\.[A-Za-z0-9-]{1,63})*$",
                      "maxLength": 253,
                      "description": "Domain to check — hostname only, no scheme/IP literal, no trailing dot, no localhost, no local/internal/reserved suffix (.local, .internal, .localdomain, .lan, .test)"
                    },
                    "selector": {
                      "type": "string",
                      "description": "Optional DKIM selector to check authoritatively; if omitted, a common-selector list is probed"
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "required": [
                    "domain",
                    "queried_at",
                    "accepts_mail",
                    "mx",
                    "spf",
                    "dmarc",
                    "dkim",
                    "warnings"
                  ],
                  "properties": {
                    "mx": {
                      "type": "array",
                      "items": {
                        "type": "object",
                        "properties": {
                          "host": {
                            "type": "string"
                          },
                          "pref": {
                            "type": "integer",
                            "maximum": 65535,
                            "minimum": 0
                          }
                        }
                      }
                    },
                    "spf": {
                      "type": [
                        "object",
                        "null"
                      ],
                      "properties": {
                        "record": {
                          "type": "string"
                        },
                        "mechanisms": {
                          "type": "array",
                          "items": {
                            "type": "object",
                            "properties": {
                              "kind": {
                                "enum": [
                                  "include",
                                  "a",
                                  "mx",
                                  "ip4",
                                  "ip6",
                                  "all",
                                  "exists",
                                  "ptr",
                                  "redirect",
                                  "exp",
                                  "unknown"
                                ],
                                "type": "string"
                              },
                              "value": {
                                "type": "string"
                              },
                              "qualifier": {
                                "enum": [
                                  "+",
                                  "-",
                                  "~",
                                  "?"
                                ],
                                "type": "string"
                              },
                              "causes_dns": {
                                "type": "boolean"
                              }
                            }
                          }
                        },
                        "dns_lookups": {
                          "type": "integer",
                          "minimum": 0,
                          "description": "count of lookup-causing terms; RFC 7208 limit is 10"
                        },
                        "all_qualifier": {
                          "enum": [
                            "-all",
                            "~all",
                            "?all",
                            "+all",
                            ""
                          ],
                          "type": "string",
                          "description": "qualifier on the all mechanism; empty when absent"
                        }
                      },
                      "description": "null when no SPF record is present"
                    },
                    "dkim": {
                      "type": "object",
                      "properties": {
                        "found": {
                          "type": "array",
                          "items": {
                            "type": "object",
                            "properties": {
                              "record": {
                                "type": "string"
                              },
                              "selector": {
                                "type": "string"
                              }
                            }
                          }
                        },
                        "checked_selectors": {
                          "type": "array",
                          "items": {
                            "type": "string"
                          },
                          "description": "exact selectors probed"
                        }
                      }
                    },
                    "dmarc": {
                      "type": [
                        "object",
                        "null"
                      ],
                      "properties": {
                        "pct": {
                          "type": "integer",
                          "default": 100,
                          "maximum": 100,
                          "minimum": 0
                        },
                        "rua": {
                          "type": "array",
                          "items": {
                            "type": "string"
                          },
                          "description": "aggregate report addresses"
                        },
                        "ruf": {
                          "type": "array",
                          "items": {
                            "type": "string"
                          },
                          "description": "forensic report addresses"
                        },
                        "aspf": {
                          "enum": [
                            "r",
                            "s"
                          ],
                          "type": "string",
                          "default": "r"
                        },
                        "adkim": {
                          "enum": [
                            "r",
                            "s"
                          ],
                          "type": "string",
                          "default": "r"
                        },
                        "policy": {
                          "enum": [
                            "none",
                            "quarantine",
                            "reject",
                            ""
                          ],
                          "type": "string",
                          "description": "p= tag; empty when missing/invalid"
                        },
                        "record": {
                          "type": "string"
                        },
                        "subdomain_policy": {
                          "type": "string",
                          "description": "sp= tag; empty when absent (inherits policy)"
                        }
                      },
                      "description": "null when no DMARC record is present"
                    },
                    "domain": {
                      "type": "string"
                    },
                    "warnings": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      },
                      "description": "human-readable posture advisories; never null"
                    },
                    "queried_at": {
                      "type": "string",
                      "format": "date-time"
                    },
                    "accepts_mail": {
                      "type": "boolean",
                      "description": "true when the domain has at least one MX record"
                    }
                  }
                }
              }
            }
          }
        },
        "category": "domain-intelligence"
      }
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/email-auth-check-spf-dmarc-dkim/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME

30d UPTIME 99.6%

RESPONSE TIME

AVG RESP 1279ms

PRICE (captured 402, USD)

SUB-SCORES (uptime + x402 compliance)

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

PILLARS OVER TIME (measured)

price percentile in Data

site signals present (of 6)

Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.

VOLUME (on-chain settlement, USD)

This service settles on a network x402-list does not measure yet, so on-chain volume is not counted here. Shown as unmeasured, not zero.

DISTINCT BUYERS

This service settles on a network x402-list does not measure yet, so distinct on-chain buyers are not counted here. Shown as unmeasured, not zero.

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-08-26 · last up 2026-09-04

402 payload captured
accepts[] array present
payTo address recoverable
payTo at accepts[0].payTo (conformant shape)
payTo is a valid on-chain address
atomic price declared
atomic price in a sane range
asset (token) address declared
network resolves to CAIP-2
payment scheme declared
served over HTTPS
declares the current x402 version (2)
EIP-712 domain parameters present on every EVM entry
x402 v2 envelope delivered in the payment-required header

SITE PILLARS

homepage reachable
openapi doc
pricing page
llms.txt
robots.txt
terms page

recent checks (18) live · click to expand

TIME STATUS RESP CAUSE

08:52:31 UTC ● OK 351ms

08:36:41 UTC ● OK 744ms

08:20:31 UTC ● OK 488ms

08:04:39 UTC ● OK 413ms

07:48:34 UTC ● OK 373ms

07:32:27 UTC ● OK 571ms

07:16:30 UTC ● OK 358ms

07:00:28 UTC ● OK 407ms

06:44:26 UTC ● OK 853ms

06:28:34 UTC ● OK 376ms

06:11:23 UTC ● OK 507ms

05:54:29 UTC ● OK 552ms

05:37:23 UTC ● OK 706ms

05:20:43 UTC ● OK 943ms

05:03:27 UTC ● OK 740ms

04:46:22 UTC ● OK 798ms

04:29:29 UTC ● OK 672ms

04:13:27 UTC ● OK 699ms

EMBED THIS BADGE

Show that Email Auth Check (SPF/DMARC/DKIM) is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

status

Email Auth Check (SPF/DMARC/DKIM) uptime on x402-list — live uptime

// HTML

<a href="https://x402-list.com/services/email-auth-check-spf-dmarc-dkim?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/email-auth-check-spf-dmarc-dkim.svg" alt="Email Auth Check (SPF/DMARC/DKIM) listed on x402-list" height="28">
</a>

// Markdown

[![Email Auth Check (SPF/DMARC/DKIM) on x402-list](https://x402-list.com/badge/email-auth-check-spf-dmarc-dkim.svg)](https://x402-list.com/services/email-auth-check-spf-dmarc-dkim?utm_source=badge&utm_medium=referral&utm_campaign=embed)

// HTML · live uptime variant

<a href="https://x402-list.com/services/email-auth-check-spf-dmarc-dkim?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/email-auth-check-spf-dmarc-dkim.svg?data=uptime" alt="Email Auth Check (SPF/DMARC/DKIM) uptime on x402-list" height="28">
</a>

RUN THIS SERVICE?

Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

[ update this listing ]

Earn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.

[ verify this service ($0.25) ]

To request delisting, email info@x402-list.com or update your listing at /services/email-auth-check-spf-dmarc-dkim/update.