x402 List

x402 Protocol Service Directory

●

DeFi Signals API

Data

Paid market-data API for AI agents (x402, USDC on Base): cross-venue perpetual funding rates (OKX, Kraken Futures, dYdX) with a ready-to-use arbitrage spread signal, outlier-cleaned DeFi yields from DefiLlama, and a low-cost BTC/ETH/SOL market snapshot with Fear & Greed index. Clean JSON, exact scheme, from $0.002 per request. OpenAPI at /openapi.json.

Pay from $0.002 to $0.01 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

UPTIME 24H 100% │ 7D 100% │ 30D 100%
BASE URL https://defi-signals.org │ WEBSITE https://defi-signals.org │ ENDPOINTS 3 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-07-17 │ MONITORED SINCE 2026-07-17

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
127ms
avg response
127ms
total checks
1
compliance A (11/12)

11 of 12 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.002 to $0.01 (p26 in Data)
price (min)
$0.002
price (max)
$0.01
category percentile (min)
p26 in Data
category percentile (max)
p29 in Data
endpoints / prices
3 / 3
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.

WHAT IT DOES

ai-derived

Provides market data for DeFi including funding rates, yields, and market snapshots

category
defi-market-data
in
query params
auth
api key
defimarket-datafunding-ratesyieldscrypto-prices

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 /defi/funding-rates $0.005 Base USDC
GET /defi/yields $0.01 Base USDC
GET /market/snapshot $0.002 Base USDC
3 endpoints

REQUEST / RESPONSE EXAMPLE

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

// request
curl -i 'https://defi-signals.org/defi/funding-rates'
// 402 response (captured by monitor) · 3 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xE72b85A97A6e19413D8b80633787Eda6d6237A77",
        "amount": "5000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://defi-signals.org/defi/funding-rates",
      "mimeType": "application/json",
      "description": "Cross-venue perpetual funding rates (OKX, Kraken Futures, dYdX) for any major token. Per-venue annualized rates plus the cross-venue spread in percentage points — a ready-to-use funding arbitrage signal. Clean JSON for trading and research agents."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "symbol": "BTC"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "as_of": "2026-07-15T08:00:00Z",
              "symbol": "BTC",
              "venues": [
                {
                  "rate": 0.0000795,
                  "venue": "okx",
                  "annualized_pct": 8.71,
                  "interval_hours": 8
                }
              ],
              "spread_annualized_pp": 5.87
            }
          }
        },
        "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": {
                    "symbol": {
                      "type": "string",
                      "description": "Token symbol, e.g. BTC, ETH, SOL"
                    }
                  }
                }
              },
              "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": "0xE72b85A97A6e19413D8b80633787Eda6d6237A77",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://defi-signals.org/defi/yields",
      "mimeType": "application/json",
      "description": "Top DeFi yield opportunities per chain from DefiLlama — TVL-filtered, outlier-cleaned (unsustainable meme-pool APYs removed), sorted by APY. Fields: project, symbol, apy_pct, apy_base_pct, tvl_usd, stable. Ideal for yield-hunting agents."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "chain": "Base",
              "max_apy_pct": 300,
              "min_tvl_usd": 1000000
            }
          },
          "output": {
            "type": "json",
            "example": {
              "chain": "Base",
              "pools": [
                {
                  "stable": true,
                  "symbol": "USDC",
                  "apy_pct": 5.42,
                  "project": "aave-v3",
                  "tvl_usd": 182400000,
                  "apy_base_pct": 5.42
                }
              ],
              "outliers_removed": 7
            }
          }
        },
        "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": {
                    "chain": {
                      "type": "string",
                      "description": "Chain name, e.g. Base, Ethereum, Arbitrum"
                    },
                    "max_apy_pct": {
                      "type": "number",
                      "description": "Outlier cap: pools above this APY are excluded (default 300)"
                    },
                    "min_tvl_usd": {
                      "type": "number",
                      "description": "Minimum pool TVL in USD (default 1000000)"
                    }
                  }
                }
              },
              "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": "0xE72b85A97A6e19413D8b80633787Eda6d6237A77",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://defi-signals.org/market/snapshot",
      "mimeType": "application/json",
      "description": "One-call market snapshot: BTC/ETH/SOL spot prices with 24h change plus the Crypto Fear & Greed index. The cheapest way for an agent to establish market context."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {}
          },
          "output": {
            "type": "json",
            "example": {
              "prices": {
                "btc_usd": 118431,
                "eth_usd": 4212.55
              },
              "fear_greed": {
                "value": 71,
                "classification": "Greed"
              }
            }
          }
        },
        "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
  }
]

UPTIME

07-17 · uptime 100.0% · 184ms avg07-1707-17
RESPONSE TIME
07-17 · 184ms avg07-17 · 184ms avg07-1707-17
90d UPTIME 100%
UPTIME 90D 100%
AVG RESP 193ms
TOTAL CHECKS 12

RECENT CHECKS

TIME STATUS RESP
● OK 225ms
● OK 140ms
● SLOW 292ms
● OK 250ms
● OK 119ms
● SLOW 337ms
● OK 129ms
● OK 127ms
● OK 150ms
● OK 267ms
● OK 148ms
● OK 127ms
12 of 12 checks

OVER TIME

All charts share the 90d window selected here. Every series is also served as JSON at /api/v1/services/defi-signals-api/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).

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)
building volume history (1 day so far)
DISTINCT BUYERS
building buyer history (1 day so far)

COMPLIANCE

11/12 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
  • response mimeType declared
  • served over HTTPS

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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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