x402 List

x402 Protocol Service Directory

●

DomainSignal

Data ✓ VERIFIED

verified until 2026-08-18

Deterministic domain classification, DNS and email-security audits, website metadata, and batch lead-list qualification paid per call with x402 USDC on Base.

Pay from $0.001 to $0.01 per request in USDC on Base / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

listed 2026-08-11 · no on-chain settlement recorded yet

BASE URL https://api.servocenter.com │ WEBSITE https://api.servocenter.com │ ENDPOINTS 4 │ NETWORK Base / Solana │ ASSET USDC │ MEMBER SINCE 2026-08-11 │ MONITORED SINCE 2026-08-11

ASSESSMENT

updated 2h ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 100%
uptime 24h
-
uptime 7d
-
uptime 30d
-
uptime 90d
-
response p95
514ms
avg response
514ms
total checks
1

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 $0.001 to $0.01 (p10 in Data)
price (min)
$0.001
price (max)
$0.01
category percentile (min)
p10 in Data
category percentile (max)
p25 in Data
endpoints / prices
4 / 3
model
tiered
stability
75%
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
8536d
registrar
Squarespace Domains II LLC
hosting
custom
domain created
2003-03-28

Identity facts, not a risk score.

traction $0.00 30d · 0 buyers
volume 30d
$0.00
buyers 30d
0
settlements 30d
0
first settlement
---
last settlement
---
top buyer share
-
trend 7d vs 30d
-
networks
eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time
$0
settlements all-time
0
median settlement 30d
-
max settlement 30d
-
settled via
-

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

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
POST /api/v1/domain/batch-classify $0.01 Base/Solana USDC header
GET /api/v1/domain/classify $0.001 Base/Solana USDC header
GET /api/v1/domain/dns-audit $0.001 Base/Solana USDC header
GET /api/v1/domain/full-profile $0.005 Base/Solana USDC header
4 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /api/v1/domain/classify returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i 'https://api.servocenter.com/api/v1/domain/classify'
// 402 response (captured by monitor) · 4 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE4b17A05c1a7F5164BeCC83E15BBB07940a06992",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
        },
        "payTo": "5vxF2Ji3NGwmyruTzGY7UTGBeG4hQ2SyxsmX63SCEqAo",
        "amount": "10000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.servocenter.com/api/v1/domain/batch-classify",
      "tags": [
        "bulk domain classification",
        "lead list triage",
        "email readiness",
        "domain enrichment"
      ],
      "iconUrl": "https://api.servocenter.com/favicon.svg",
      "mimeType": "application/json",
      "description": "Classify up to 100 domains in one call for lead-list qualification, routing, and enrichment triage.",
      "serviceName": "DomainSignal"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "domains": [
                "example.com",
                "openai.com"
              ]
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "failed": 0,
              "unique": 2,
              "results": [],
              "requested": 2,
              "successful": 2
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "required": [
                    "domains"
                  ],
                  "properties": {
                    "domains": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      },
                      "maxItems": 100,
                      "minItems": 1,
                      "description": "Domain names, URLs, or email addresses"
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE4b17A05c1a7F5164BeCC83E15BBB07940a06992",
        "amount": "1000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"
        },
        "payTo": "5vxF2Ji3NGwmyruTzGY7UTGBeG4hQ2SyxsmX63SCEqAo",
        "amount": "1000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.servocenter.com/api/v1/domain/classify",
      "tags": [
        "domain qualification",
        "lead routing",
        "email readiness",
        "dns",
        "low-cost"
      ],
      "iconUrl": "https://api.servocenter.com/favicon.svg",
      "mimeType": "application/json",
      "description": "Classify a domain for lead qualification and email routing decisions using public DNS evidence.",
      "serviceName": "DomainSignal"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "domain": "example.com"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "domain": "example.com",
              "has_dns": true,
              "confidence": 0.93,
              "disposable": false,
              "mx_provider": "example.com",
              "observed_at": "2026-08-06T00:00:00.000Z",
              "classification": "custom_domain",
              "spf_configured": true,
              "mail_configured": true,
              "free_email_provider": false,
              "website_dns_present": true
            }
          }
        },
        "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",
                      "description": "Domain name, URL, or email address"
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "required": [
                    "domain",
                    "classification",
                    "has_dns",
                    "website_dns_present",
                    "mail_configured",
                    "mx_provider",
                    "spf_configured",
                    "disposable",
                    "free_email_provider",
                    "confidence",
                    "observed_at"
                  ],
                  "properties": {
                    "domain": {
                      "type": "string"
                    },
                    "has_dns": {
                      "type": "boolean"
                    },
                    "confidence": {
                      "type": "number",
                      "maximum": 1,
                      "minimum": 0
                    },
                    "disposable": {
                      "type": "boolean"
                    },
                    "mx_provider": {
                      "anyOf": [
                        {
                          "type": "string"
                        },
                        {
                          "type": "null"
                        }
                      ]
                    },
                    "observed_at": {
                      "type": "string",
                      "format": "date-time"
                    },
                    "classification": {
                      "enum": [
                        "disposable_email",
                        "free_email_provider",
                        "custom_domain",
                        "unresolved"
                      ],
                      "type": "string"
                    },
                    "spf_configured": {
                      "type": "boolean"
                    },
                    "mail_configured": {
                      "type": "boolean"
                    },
                    "free_email_provider": {
                      "type": "boolean"
                    },
                    "website_dns_present": {
                      "type": "boolean"
                    }
                  },
                  "additionalProperties": false
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE4b17A05c1a7F5164BeCC83E15BBB07940a06992",
        "amount": "1000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"
        },
        "payTo": "5vxF2Ji3NGwmyruTzGY7UTGBeG4hQ2SyxsmX63SCEqAo",
        "amount": "1000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.servocenter.com/api/v1/domain/dns-audit",
      "tags": [
        "email security",
        "dns audit",
        "spf",
        "dmarc",
        "dkim",
        "remediation"
      ],
      "iconUrl": "https://api.servocenter.com/favicon.svg",
      "mimeType": "application/json",
      "description": "Audit MX, SPF, DMARC, and an optional DKIM selector with risk scoring and remediation steps.",
      "serviceName": "DomainSignal"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "domain": "example.com",
              "selector": "google"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "risks": [
                "DMARC is missing"
              ],
              "score": 75,
              "domain": "example.com",
              "recommendations": []
            }
          }
        },
        "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",
                      "description": "Domain name, URL, or email address"
                    },
                    "selector": {
                      "type": "string",
                      "description": "Optional DKIM selector"
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE4b17A05c1a7F5164BeCC83E15BBB07940a06992",
        "amount": "5000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
        },
        "payTo": "5vxF2Ji3NGwmyruTzGY7UTGBeG4hQ2SyxsmX63SCEqAo",
        "amount": "5000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.servocenter.com/api/v1/domain/full-profile",
      "tags": [
        "domain enrichment",
        "website metadata",
        "technology detection",
        "email security",
        "opportunity flags"
      ],
      "iconUrl": "https://api.servocenter.com/favicon.svg",
      "mimeType": "application/json",
      "description": "Return a domain qualification profile combining DNS, email-security posture, website metadata, technology hints, and opportunity flags.",
      "serviceName": "DomainSignal"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "domain": "example.com",
              "selector": "google"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "domain": "example.com",
              "website": {
                "active": true
              },
              "opportunity_flags": {
                "email_security_gap": true
              }
            }
          }
        },
        "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",
                      "description": "Domain name, URL, or email address"
                    },
                    "selector": {
                      "type": "string",
                      "description": "Optional DKIM selector"
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 7d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/domainsignal/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
08-11 · uptime 100.0% · 556ms avg08-1108-11
7d UPTIME 100%
RESPONSE TIME
08-11 · 556ms avg08-11 · 556ms avg08-1108-11
AVG RESP 537ms
PRICE (captured 402, USD)
building price history ($0.003)

Median across 4 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
building assessment history (1 day so far)

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

VOLUME (on-chain settlement, USD)
no on-chain volume yet
DISTINCT BUYERS
no distinct buyers yet

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-08-11 · last up 2026-08-11

  • 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 (8) live · click to expand
TIME STATUS RESP CAUSE
● OK 406ms
● SLOW 1315ms
● OK 349ms
● OK 547ms
● OK 423ms
● OK 336ms
● OK 409ms
● OK 514ms
8 of 8 checks · live count

EMBED THIS BADGE

Show that DomainSignal is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

DomainSignal listed on x402-list
status
DomainSignal uptime on x402-list
live uptime
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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.

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