x402 List

x402 Protocol Service Directory

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BaseSentinel

Blockchain PAYMENT-READY

payment-ready until 2026-08-16

Base threat-intel API for AI agents (M2M). HTTP 402 + USDC on Base. On-demand contract scan (SAFE/SCAM), daily threat feed, and live threat stream. Settlement via X-Payment-Proof (USDC tx hash).

Pay from $0.005 to $0.01 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

listed 2026-08-03 · no on-chain settlement recorded yet

BASE URL https://api.blackswanlabs.pl │ WEBSITE https://blackswanlabs.pl │ ENDPOINTS 3 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-08-03 │ MONITORED SINCE 2026-08-03

ASSESSMENT

updated 3h ago

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

reliability 95.7%
uptime 24h
0%
uptime 7d
89.7%
uptime 30d
95.7%
uptime 90d
95.7%
response p95
326ms
avg response
166ms
total checks
578

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 $0.005 to $0.01 (p47 in Blockchain)
price (min)
$0.005
price (max)
$0.01
category percentile (min)
p47 in Blockchain
category percentile (max)
p40 in Blockchain
endpoints / prices
3 / 2
model
tiered
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
12d
registrar
cyber_Folks S.A.
hosting
custom
domain created
2026-07-28

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
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
GET /api/feed/daily/2026-07-30 $0.01 Base USDC header
GET /scan/0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 $0.005 Base USDC header
GET /stream/threats $0.005 Base USDC header
3 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /api/feed/daily/2026-07-30 returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i 'https://api.blackswanlabs.pl/api/feed/daily/2026-07-30'
// 402 response (captured by monitor) · 3 payloads · click to expand 
[
  {
    "error": "X-Payment-Proof (USDC Transfer tx hash) is required. Coinbase facilitator / EIP-3009 PAYMENT-SIGNATURE payloads are not accepted.",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USDC",
          "version": "2"
        },
        "payTo": "0x21360A04853b85a8d2E918b73f97C8ccf5939946",
        "amount": "5000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.blackswanlabs.pl/scan/0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "mimeType": "application/json",
      "description": "On-demand Base contract scan (bytecode + GoPlus + honeypot.is) with CLEAR/CAUTION/AVOID verdict"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "headers": {
              "X-Payment-Proof": "<base_usdc_tx_hash>"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "status": "SAFE",
              "reasons": [
                "None"
              ],
              "verdict": "CLEAR",
              "riskScore": 12,
              "risk_flags": [],
              "verdict_score": 88,
              "creator_attribution": null
            }
          }
        },
        "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",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "headers": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                },
                "queryParams": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      },
      "baseSentinel": {
        "note": "Pay with an on-chain USDC Transfer to payTo, then send that tx hash in X-Payment-Proof. Do not use Coinbase facilitator settlement.",
        "binding": "one_tx_hash_per_contract",
        "product": "scan",
        "settlement": "tx_hash_proof",
        "facilitator": false,
        "proofHeader": "X-Payment-Proof",
        "humanNetwork": "base"
      }
    },
    "x402Version": 2
  },
  {
    "error": "X-Payment-Proof (USDC Transfer tx hash) is required. Coinbase facilitator / EIP-3009 PAYMENT-SIGNATURE payloads are not accepted.",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USDC",
          "version": "2"
        },
        "payTo": "0x21360A04853b85a8d2E918b73f97C8ccf5939946",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.blackswanlabs.pl/api/feed/daily/2026-07-30",
      "mimeType": "application/json",
      "description": "Daily Base threat pack (SCAM + SUSPICIOUS) from watched DEX/launcher coverage"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "headers": {
              "X-Payment-Proof": "<base_usdc_tx_hash>"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "status": "SAFE",
              "reasons": [
                "None"
              ],
              "verdict": "CLEAR",
              "riskScore": 12,
              "risk_flags": [],
              "verdict_score": 88,
              "creator_attribution": null
            }
          }
        },
        "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",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "headers": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                },
                "queryParams": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      },
      "baseSentinel": {
        "note": "Pay with an on-chain USDC Transfer to payTo, then send that tx hash in X-Payment-Proof. Do not use Coinbase facilitator settlement.",
        "binding": "one_tx_hash_per_feed_date",
        "product": "daily_feed",
        "settlement": "tx_hash_proof",
        "facilitator": false,
        "proofHeader": "X-Payment-Proof",
        "humanNetwork": "base"
      }
    },
    "x402Version": 2
  },
  {
    "error": "X-Payment-Proof (USDC Transfer tx hash) is required. Coinbase facilitator / EIP-3009 PAYMENT-SIGNATURE payloads are not accepted.",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USDC",
          "version": "2"
        },
        "payTo": "0x21360A04853b85a8d2E918b73f97C8ccf5939946",
        "amount": "5000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.blackswanlabs.pl/stream/threats",
      "mimeType": "application/json",
      "description": "Live SSE stream of newly flagged Base threats (SCAM/SUSPICIOUS)"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "headers": {
              "X-Payment-Proof": "<base_usdc_tx_hash>"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "status": "SAFE",
              "reasons": [
                "None"
              ],
              "verdict": "CLEAR",
              "riskScore": 12,
              "risk_flags": [],
              "verdict_score": 88,
              "creator_attribution": null
            }
          }
        },
        "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",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "headers": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                },
                "queryParams": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      },
      "baseSentinel": {
        "note": "Pay with an on-chain USDC Transfer to payTo, then send that tx hash in X-Payment-Proof. Do not use Coinbase facilitator settlement.",
        "binding": "one_tx_hash_per_stream_day",
        "product": "live_stream",
        "settlement": "tx_hash_proof",
        "facilitator": false,
        "proofHeader": "X-Payment-Proof",
        "humanNetwork": "base"
      }
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 90d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/basesentinel/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
08-09 · uptime 77.1% · 208ms avg08-10 · uptime 0.0%08-11 · uptime 0.0%08-12 · uptime 0.0%08-13 · uptime 0.0%08-03 · uptime 100.0% · 159ms avg08-04 · uptime 100.0% · 119ms avg08-05 · uptime 100.0% · 204ms avg08-06 · uptime 100.0% · 140ms avg08-07 · uptime 100.0% · 177ms avg08-08 · uptime 100.0% · 176ms avg08-09 · uptime 77.1% · 208ms avg08-10 · uptime 0.0%08-11 · uptime 0.0%08-12 · uptime 0.0%08-13 · uptime 0.0%08-0308-13
90d UPTIME 95.5%
RESPONSE TIME
08-03 · 159ms avg08-03 · 159ms avg08-04 · 119ms avg08-04 · 119ms avg08-05 · 204ms avg08-05 · 204ms avg08-06 · 140ms avg08-06 · 140ms avg08-07 · 177ms avg08-07 · 177ms avg08-08 · 176ms avg08-08 · 176ms avg08-09 · 208ms avg08-09 · 208ms avg08-10 · 0ms avg08-10 · 0ms avg08-11 · 0ms avg08-11 · 0ms avg08-12 · 0ms avg08-12 · 0ms avg08-13 · 0ms avg08-13 · 0ms avg08-0308-13
AVG RESP 166ms
PRICE (captured 402, USD)
08-03 · $0.00508-13 · $0.005$0.00508-0308-13

Median across 3 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
08-03 uptime: 100.0% compliance: 100% checks08-04 uptime: 100.0% compliance: 100% checks08-05 uptime: 100.0% compliance: 100% checks08-06 uptime: 100.0% compliance: 100% checks08-07 uptime: 100.0% compliance: 100% checks08-08 uptime: 100.0% compliance: 100% checks08-09 uptime: 98.0% compliance: 100% checks08-10 uptime: 97.5% compliance: 100% checks08-11 uptime: 96.8% compliance: 100% checks08-12 uptime: 96.2% compliance: 100% checks08-13 uptime: 95.7% compliance: 100% checksuptimecompliance08-0308-13

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 Blockchain
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)
no on-chain volume yet
DISTINCT BUYERS
no distinct buyers yet

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-08-03 · last up 2026-08-09

  • 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
○ DOWN 117ms network: SSRF: resolved to a private address
○ DOWN 28ms network: SSRF: resolved to a private address
○ DOWN 100ms network: SSRF: resolved to a private address
○ DOWN 27ms network: SSRF: resolved to a private address
○ DOWN 27ms network: SSRF: resolved to a private address
○ DOWN 36ms network: SSRF: resolved to a private address
○ DOWN 210ms network: SSRF: resolved to a private address
○ DOWN 45ms network: SSRF: resolved to a private address
○ DOWN 360ms network: SSRF: resolved to a private address
○ DOWN 21ms network: SSRF: resolved to a private address
○ DOWN 18ms network: SSRF: resolved to a private address
○ DOWN 114ms network: SSRF: resolved to a private address
○ DOWN 36ms network: SSRF: resolved to a private address
○ DOWN 30ms network: SSRF: resolved to a private address
○ DOWN 25ms network: SSRF: resolved to a private address
○ DOWN 27ms network: SSRF: resolved to a private address
○ DOWN 41ms network: SSRF: resolved to a private address
○ DOWN 31ms network: SSRF: resolved to a private address
18 of 578 checks · live count

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