x402 List

x402 Protocol Service Directory

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Crest Wallet Intelligence

Data

Counterparty intelligence for the agent economy. Profile any x402 buyer or Base/EVM wallet before you transact: whale score, behavioral cluster, x402 spend graph, top services, and risk level. Plus on-chain and crypto market data (prices, gas, DeFi, derivatives). Pay-per-call in USDC on Base, no API keys, no subscription.

Pay from $0.002 to $0.90 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

first settlement 2026-05-15 · $52.21 all-time · settled via coinbase

BASE URL https://data.crestsystems.ai │ WEBSITE https://crestsystems.ai │ ENDPOINTS 4 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-06-25 │ MONITORED SINCE 2026-06-25

ASSESSMENT

updated 4h ago

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

reliability 23%
uptime 24h
0%
uptime 7d
0%
uptime 30d
23%
uptime 90d
59.1%
response p95
1692ms
avg response
349ms
total checks
1,945

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

compliance A (14/14), stale (probe failing)

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

jump to compliance checklist

price $0.002 to $0.90 (p21 in Data)
price (min)
$0.002
price (max)
$0.90
category percentile (min)
p21 in Data
category percentile (max)
p93 in Data
endpoints / prices
4 / 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
-
registrar
-
hosting
custom
domain created
---

Identity facts, not a risk score.

traction $1.064 30d · 111 buyers
volume 30d
$1.064
buyers 30d
111
settlements 30d
126
first settlement
2026-05-15
last settlement
2026-07-27
top buyer share
75% of 30d volume
trend 7d vs 30d
0.00x the 30d daily rate
networks
eip155:8453
volume all-time
$52.21
settlements all-time
2,190
median settlement 30d
$0.002
max settlement 30d
$0.75
settled via
coinbase ($1.06, 126 tx)

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

Provides blockchain data including gas prices, token prices, trending data, and wallet information

category
blockchain-data
in
query params
blockchaingas-pricestoken-priceswallet-datamarket-data

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 402 CHANNEL
GET /data/gas $0.002 Base USDC header
GET /data/prices $0.002 Base USDC header
GET /data/trending $0.002 Base USDC header
GET /data/wallet/0x0000000000000000000000000000000000000000 $0.90 Base USDC header
4 endpoints

REQUEST / RESPONSE EXAMPLE

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

// request
curl -i 'https://data.crestsystems.ai/data/gas'
// 402 response (captured by monitor) · 4 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xAe0DFe00827c07b7Db4514683bCc3aD0E85200b1",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://data.crestsystems.ai/data/prices",
      "mimeType": "application/json",
      "description": "Crest · prices -- Fetch top 25 crypto token prices and return price, 24h change percentage, 7d change, market cap, and 24h volume for each token. Covers BTC, ETH, SOL, and 22 more by market cap."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {}
          },
          "output": {
            "type": "json",
            "example": {
              "paid": true,
              "count": 25,
              "prices": [
                {
                  "id": "bitcoin",
                  "name": "Bitcoin",
                  "price": 78293,
                  "symbol": "BTC",
                  "low_24h": 77800,
                  "high_24h": 79100,
                  "change_7d": 3.2,
                  "change_24h": -1.16,
                  "market_cap": 1550000000000,
                  "volume_24h": 32000000000
                }
              ]
            }
          }
        },
        "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",
                  "properties": {}
                }
              },
              "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": "0xAe0DFe00827c07b7Db4514683bCc3aD0E85200b1",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://data.crestsystems.ai/data/gas",
      "mimeType": "application/json",
      "description": "Crest · gas_oracle -- Fetch current gas prices across multiple EVM chains. Returns fast/standard/slow estimates in gwei for Base, Ethereum, Polygon, Arbitrum, and Optimism."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {}
          },
          "output": {
            "type": "json",
            "example": {
              "gas": {
                "base": {
                  "fast": 0.008,
                  "slow": 0.005,
                  "unit": "gwei",
                  "standard": 0.006
                },
                "ethereum": {
                  "fast": 15,
                  "slow": 7,
                  "unit": "gwei",
                  "standard": 10
                }
              },
              "paid": 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",
                  "properties": {}
                }
              },
              "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": "0xAe0DFe00827c07b7Db4514683bCc3aD0E85200b1",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://data.crestsystems.ai/data/trending",
      "mimeType": "application/json",
      "description": "Crest · trending_tokens -- Fetch top 15 trending cryptocurrencies ranked by search interest and trading volume. Returns symbol, name, market cap rank, and BTC-denominated price."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {}
          },
          "output": {
            "type": "json",
            "example": {
              "paid": true,
              "count": 15,
              "trending": [
                {
                  "id": "pepe",
                  "name": "Pepe",
                  "score": 0,
                  "symbol": "PEPE",
                  "price_btc": 1.5e-10,
                  "market_cap_rank": 25
                }
              ]
            }
          }
        },
        "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",
                  "properties": {}
                }
              },
              "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": "0xAe0DFe00827c07b7Db4514683bCc3aD0E85200b1",
        "amount": "900000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://data.crestsystems.ai/data/wallet/0x0000000000000000000000000000000000000000",
      "mimeType": "application/json",
      "description": "Witnos wallet intelligence: full scored profile for any Base or EVM wallet, the deep read behind a verify. Whale score (0-1 composite of spend velocity, service diversity, premium ratio, repeat rate), behavioral cluster, x402 spend graph, counterparty check, payment history, top services, risk assessment and temporal patterns. A wallet tracker and profiler built from 18,000+ profiled wallets."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "pathParams": {
              "address": "0x0000000000000000000000000000000000000000"
            },
            "queryParams": {
              "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
              "profile": {
                "cluster": "premium_buyer",
                "active_days": 38,
                "repeat_rate": 0.73,
                "whale_score": 0.82,
                "last_payment": "2026-05-16T19:45:00Z",
                "first_payment": "2026-04-01T08:00:00Z",
                "premium_ratio": 0.61,
                "services_used": 11,
                "total_payments": 142,
                "avg_payment_usdc": 2.01,
                "total_spent_usdc": 285.5
              },
              "sources": [
                "base:mainnet:usdc-transfers",
                "crest:profiler:v2"
              ],
              "temporal": {
                "peak_hour_utc": 14,
                "most_active_day": "Tuesday",
                "avg_payments_per_day": 3.7
              },
              "queriedAt": "2026-05-16T20:00:00.000Z",
              "intelligence": {
                "behavior": "premium_buyer",
                "is_whale": true,
                "confidence": 0.94,
                "risk_level": "low",
                "spending_trend": "increasing",
                "velocity_rank_percentile": 92
              },
              "top_services": [
                {
                  "calls": 35,
                  "avg_price": 3.01,
                  "last_used": "2026-05-16T19:30:00Z",
                  "spent_usdc": 105.2,
                  "service_address": "0x5d6dF6b10C54617dac4Bf9993ad9fA384b7B36d3"
                },
                {
                  "calls": 22,
                  "avg_price": 2.05,
                  "spent_usdc": 45,
                  "service_address": "0x6d6E695bB2F5e5F0DeBd3E2b15f111Fb56F3d5b21"
                }
              ]
            }
          }
        },
        "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"
                },
                "pathParams": {
                  "type": "object"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "address"
                  ],
                  "properties": {
                    "address": {
                      "type": "string",
                      "description": "EVM wallet address to profile (0x + 40 hex characters). Any Base mainnet wallet with x402 payment history."
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        },
        "routeTemplate": "/data/wallet/:address"
      }
    },
    "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/crest-wallet-intelligence/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
08-07 · uptime 0.0%08-08 · uptime 0.0%08-09 · uptime 0.0%08-10 · uptime 0.0%08-11 · uptime 0.0%08-12 · uptime 0.0%08-13 · uptime 0.0%08-07 · uptime 0.0%08-08 · uptime 0.0%08-09 · uptime 0.0%08-10 · uptime 0.0%08-11 · uptime 0.0%08-12 · uptime 0.0%08-13 · uptime 0.0%08-0708-13
7d UPTIME 0%
RESPONSE TIME
no data
AVG RESP 349ms
PRICE (captured 402, USD)
08-06 · $0.00208-13 · $0.002$0.00208-0608-13

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

SUB-SCORES (uptime + x402 compliance)
08-06 uptime: 41.0% compliance: 100% checks08-07 uptime: 39.3% compliance: 100% checks08-08 uptime: 36.9% compliance: 100% checks08-09 uptime: 34.3% compliance: 100% checks08-10 uptime: 31.4% compliance: 100% checks08-11 uptime: 28.3% compliance: 100% checks08-12 uptime: 25.5% compliance: 100% checks08-13 uptime: 23.0% compliance: 100% checksuptimecompliance08-0608-13

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 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)
no on-chain volume in the last 7d
DISTINCT BUYERS
no distinct buyers in the last 7d

COMPLIANCE

14/14 checks pass · grade A · stale (probe failing)

last 402 captured 2026-07-13 · last up 2026-07-28

  • 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 119ms network: SSRF: resolved to a private address
○ DOWN 306ms network: SSRF: resolved to a private address
○ DOWN 89ms network: SSRF: resolved to a private address
○ DOWN 248ms network: SSRF: resolved to a private address
○ DOWN 141ms network: SSRF: resolved to a private address
○ DOWN 192ms network: SSRF: resolved to a private address
○ DOWN 113ms network: SSRF: resolved to a private address
○ DOWN 178ms network: SSRF: resolved to a private address
○ DOWN 224ms network: SSRF: resolved to a private address
○ DOWN 118ms network: SSRF: resolved to a private address
○ DOWN 8ms network: SSRF: resolved to a private address
○ DOWN 65ms network: SSRF: resolved to a private address
○ DOWN 22ms network: SSRF: resolved to a private address
○ DOWN 406ms network: SSRF: resolved to a private address
○ DOWN 189ms network: SSRF: resolved to a private address
○ DOWN 39ms network: SSRF: resolved to a private address
○ DOWN 1288ms network: SSRF: resolved to a private address
○ DOWN 196ms network: SSRF: resolved to a private address
18 of 1,946 checks · live count

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