kairostamp.com

https://kairostamp.com/api/v1/verify

Shares a payout wallet with 9 other endpoints — its adoption is attributed from that shared wallet's traffic, not earned exclusively.

Receipt verification: read-only hash-chain verification of one existing Kairostamp receipt id. Recomputes the canonical SHA-256 digest, compares it with the stored chain hash, checks linkage to the preceding entry and reports whether the entry is covered by an on-chain checkpoint. Performs no outbound fetch. Single GET query parameter (receipt_id).

55
reliability

Reliability & health

Uptime and response time from our own unpaid probes, plus the reliability score built from them.

7 days 30 days

Uptime

66.7% avg
0% 50% 100% Aug 23Aug 25Aug 26Aug 28

Response time

p50 595ms · p95 1557ms
0ms 500ms 1000ms Aug 23Aug 25Aug 26Aug 28
Data table
Reliability history per time bucket over the last 30 days (daily).
Bucket Uptime Probes Response time
8/23/2026, 12:00:00 AM 0% 1 —
8/24/2026, 12:00:00 AM 0% 1 —
8/25/2026, 12:00:00 AM 100% 5 696ms
8/26/2026, 12:00:00 AM 100% 10 526ms
8/27/2026, 12:00:00 AM 100% 13 461ms
8/28/2026, 12:00:00 AM 100% 1 909ms
55
Composite reliability — the weighted average of the dimensions below, on a 0–100 scale.
Availability
94

How often it was reachable when we probed it (weight 35%).

Latency
89

How quickly it answers when it is up — fast scores high (weight 20%).

Security
100

Whether it serves over working TLS / https (weight 15%).

Transparency
67

Whether the operator disclosed what it does — description, schema, identity (weight 15%).

Activity
1

Observed on-chain payments to this endpoint's wallet — transactions, volume, and distinct paying wallets over the last month (weight 15%; not yet measured when we have not seen its wallet settle).

Confidence 62% — how much probe evidence backs this score. A thin history is flagged, not hidden.

See the scoring methodology for exactly how each number is computed.

Payment

Currencies
USDC
Networks
base
Facilitator
unknown
SDK
unknown

Operator

Company
inferred — unknown
Jurisdiction
—
Registrar
Porkbun LLC
Domain registered
2026-08-21
Hosting network
DET-FRA-CUSTOMERS
Hosting country
EU

Operator context is derived from public RDAP/TLS records and unverified. Company and country are only available for endpoints that publish them (an OV/EV TLS certificate or a non-redacted domain record); most endpoints are CDN-fronted and disclose neither.

On-chain activity (base)

11
payments (30d)
0.04
USD volume (30d)
2
paying wallets (30d)

Payments per day

last payment 8/23/2026
0 10 20 Aug 23
Data table
Settled payments per day.
Day Payments Volume (USD) Paying wallets
8/23/2026 11 0.04 2

This payout wallet is shared: figures cover all 10 endpoints paid at it, since payments cannot be attributed to one of them. Only payments settled on chains and facilitators we index.

Linked by wallet — likely same operator

On-chain agent identity and the x402 endpoint that shares its settlement wallet.

https://kairostamp.com/api/v1/robots-check x402 endpoint https://kairostamp.com/api/v1/sitemap x402 endpoint https://kairostamp.com/api/v1/text-extract x402 endpoint https://kairostamp.com/api/v1/headers x402 endpoint https://kairostamp.com/api/v1/link-map x402 endpoint https://kairostamp.com/api/v1/redirect-audit x402 endpoint https://kairostamp.com/api/v1/digest x402 endpoint
Response schema 
{
  "properties": {
    "anchor": {
      "properties": {
        "chain_seq": {
          "type": [
            "integer",
            "null"
          ]
        },
        "covered": {
          "description": "True when a checkpoint covers this entry.",
          "type": "boolean"
        },
        "network": {
          "type": [
            "string",
            "null"
          ]
        },
        "note": {
          "type": "string"
        },
        "status": {
          "type": [
            "string",
            "null"
          ]
        }
      },
      "required": [
        "covered"
      ],
      "type": "object"
    },
    "chain": {
      "properties": {
        "chain_hash": {
          "type": [
            "string",
            "null"
          ]
        },
        "chain_seq": {
          "type": "integer"
        },
        "linked": {
          "description": "True when the stored previous hash matches the preceding entry.",
          "type": [
            "boolean",
            "null"
          ]
        },
        "previous_chain_hash": {
          "type": [
            "string",
            "null"
          ]
        }
      },
      "required": [
        "chain_seq",
        "chain_hash",
        "previous_chain_hash",
        "linked"
      ],
      "type": "object"
    },
    "codes": {
      "items": {
        "type": "string"
      },
      "type": "array"
    },
    "exists": {
      "type": "boolean"
    },
    "method": {
      "description": "Verification method used.",
      "type": "string"
    },
    "receipt_id": {
      "format": "uuid",
      "type": "string"
    },
    "verdict": {
      "description": "Result of recomputing the canonical digest for this entry.",
      "enum": [
        "valid",
        "invalid",
        "indeterminate",
        "quarantined_legacy"
      ],
      "type": "string"
    }
  },
  "required": [
    "receipt_id",
    "exists",
    "verdict",
    "chain"
  ],
  "type": "object"
}