x402 List

x402 Protocol Service Directory

●

BaseSentinel

Blockchain

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 100%
uptime 24h
-
uptime 7d
-
uptime 30d
-
uptime 90d
-
response p95
27ms
avg response
27ms
total checks
1
compliance A (14/14)

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

jump to compliance checklist

price $0.005 to $0.01 (p35 in Blockchain)
price (min)
$0.005
price (max)
$0.01
category percentile (min)
p35 in Blockchain
category percentile (max)
p28 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
5d
registrar
cyber_Folks S.A.
hosting
custom
domain created
2026-07-28

Identity facts, not a risk score.

traction $0 30d · 0 buyers
volume 30d
$0
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
$0
max settlement 30d
$0
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

BaseSentinel provides blockchain security intelligence by scanning smart contracts and monitoring threats on the Base network.

category
blockchain-security
in
path
blockchain-securitysmart-contract-scanningthreat-monitoringbase-network

AI-generated summary. The measured data is never altered by it.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET
GET /api/feed/daily/2026-07-30 $0.01 Base USDC
GET /scan/0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 $0.005 Base USDC
GET /stream/threats $0.005 Base USDC
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 share the 90d window selected here. 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
08-03 · uptime 100.0% · 85ms avg08-0308-03
90d UPTIME 100%
RESPONSE TIME
08-03 · 85ms avg08-03 · 85ms avg08-0308-03
AVG RESP 109ms
PRICE (captured 402, USD)
building price history ($0.005)

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

SUB-SCORES (uptime + x402 compliance)
building assessment history (1 day so far)
VOLUME (on-chain settlement, USD)
no on-chain volume yet
DISTINCT BUYERS
no distinct buyers yet

COMPLIANCE

14/14 checks pass · grade A
  • 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 (11) · click to expand
TIME STATUS RESP
● SLOW 171ms
● SLOW 258ms
● OK 83ms
● OK 39ms
● SLOW 229ms
● OK 30ms
● OK 27ms
● SLOW 262ms
● OK 43ms
● OK 25ms
● OK 27ms
11 of 11 checks

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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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