x402 List

x402 Protocol Service Directory

●

DeFi Signals API

Data PAYMENT-READY

payment-ready until 2026-08-20

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.

first settlement 2026-07-17 · $0.71 all-time · settled via coinbase, payAI

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 4h 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
100%
uptime 7d
100%
uptime 30d
100%
uptime 90d
100%
response p95
651ms
avg response
281ms
total checks
2,427

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 $0.002 to $0.01 (p21 in Data)
price (min)
$0.002
price (max)
$0.01
category percentile (min)
p21 in Data
category percentile (max)
p24 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.

domain age
22d
registrar
RegistryGate GmbH
hosting
custom
domain created
2026-07-16

Identity facts, not a risk score.

traction $0.7195 30d · 11 buyers
volume 30d
$0.7195
buyers 30d
11
settlements 30d
34
first settlement
2026-07-17
last settlement
2026-08-13
top buyer share
36% of 30d volume
trend 7d vs 30d
0.04x the 30d daily rate
networks
eip155:8453
volume all-time
$0.71
settlements all-time
34
median settlement 30d
$0.01
max settlement 30d
$0.50
settled via
coinbase ($1.42, 33 tx), payAI ($0.02, 1 tx)

Attributed pro-quota: this payout address is shared, so volume is the operator-level figure divided by the services sharing it, while buyer and transaction counts stay whole. A declared convention, not an individually observed measure, and still a conservative undercount.

Currently sharing this payout address with x402-signature-service.

Top buyer share is a concentration signal, not part of the ranking score.

WHAT IT DOES

ai-derived

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

category
defi-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 402 CHANNEL
GET /defi/funding-rates $0.005 Base USDC header
GET /defi/yields $0.01 Base USDC header
GET /market/snapshot $0.002 Base USDC header
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
  }
]

OVER TIME

All charts use the 30d selector; each series spans only the dates it has data for. 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). 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
07-17 · uptime 100.0% · 179ms avg07-18 · uptime 100.0% · 175ms avg07-19 · uptime 100.0% · 187ms avg07-20 · uptime 100.0% · 205ms avg07-21 · uptime 100.0% · 131ms avg07-22 · uptime 100.0% · 154ms avg07-23 · uptime 100.0% · 112ms avg07-24 · uptime 100.0% · 192ms avg07-25 · uptime 100.0% · 312ms avg07-26 · uptime 100.0% · 237ms avg07-27 · uptime 100.0% · 197ms avg07-28 · uptime 100.0% · 226ms avg07-29 · uptime 100.0% · 327ms avg07-30 · uptime 100.0% · 348ms avg07-31 · uptime 100.0% · 438ms avg08-01 · uptime 100.0% · 389ms avg08-02 · uptime 100.0% · 354ms avg08-03 · uptime 100.0% · 376ms avg08-04 · uptime 100.0% · 354ms avg08-05 · uptime 100.0% · 352ms avg08-06 · uptime 100.0% · 259ms avg08-07 · uptime 100.0% · 313ms avg08-08 · uptime 100.0% · 385ms avg08-09 · uptime 100.0% · 325ms avg08-10 · uptime 100.0% · 287ms avg08-11 · uptime 100.0% · 348ms avg08-12 · uptime 100.0% · 337ms avg08-13 · uptime 100.0% · 336ms avg07-1708-13
30d UPTIME 100%
RESPONSE TIME
07-17 · 179ms avg07-17 · 179ms avg07-18 · 175ms avg07-18 · 175ms avg07-19 · 187ms avg07-19 · 187ms avg07-20 · 205ms avg07-20 · 205ms avg07-21 · 131ms avg07-21 · 131ms avg07-22 · 154ms avg07-22 · 154ms avg07-23 · 112ms avg07-23 · 112ms avg07-24 · 192ms avg07-24 · 192ms avg07-25 · 312ms avg07-25 · 312ms avg07-26 · 237ms avg07-26 · 237ms avg07-27 · 197ms avg07-27 · 197ms avg07-28 · 226ms avg07-28 · 226ms avg07-29 · 327ms avg07-29 · 327ms avg07-30 · 348ms avg07-30 · 348ms avg07-31 · 438ms avg07-31 · 438ms avg08-01 · 389ms avg08-01 · 389ms avg08-02 · 354ms avg08-02 · 354ms avg08-03 · 376ms avg08-03 · 376ms avg08-04 · 354ms avg08-04 · 354ms avg08-05 · 352ms avg08-05 · 352ms avg08-06 · 259ms avg08-06 · 259ms avg08-07 · 313ms avg08-07 · 313ms avg08-08 · 385ms avg08-08 · 385ms avg08-09 · 325ms avg08-09 · 325ms avg08-10 · 287ms avg08-10 · 287ms avg08-11 · 348ms avg08-11 · 348ms avg08-12 · 337ms avg08-12 · 337ms avg08-13 · 336ms avg08-13 · 336ms avg07-1708-13
AVG RESP 281ms
PRICE (captured 402, USD)
07-17 · $0.00508-13 · $0.005$0.00507-1708-13

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

SUB-SCORES (uptime + x402 compliance)
07-17 uptime: 100.0% compliance: 100% checks07-18 uptime: 100.0% compliance: 100% checks07-19 uptime: 100.0% compliance: 100% checks07-20 uptime: 100.0% compliance: 100% checks07-21 uptime: 100.0% compliance: 100% checks07-22 uptime: 100.0% compliance: 100% checks07-23 uptime: 100.0% compliance: 100% checks07-24 uptime: 100.0% compliance: 100% checks07-25 uptime: 100.0% compliance: 100% checks07-26 uptime: 100.0% compliance: 100% checks07-27 uptime: 100.0% compliance: 100% checks07-28 uptime: 100.0% compliance: 100% checks07-29 uptime: 100.0% compliance: 100% checks07-30 uptime: 100.0% compliance: 100% checks07-31 uptime: 100.0% compliance: 100% checks08-01 uptime: 100.0% compliance: 100% checks08-02 uptime: 100.0% compliance: 100% checks08-03 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: 100.0% compliance: 100% checks08-10 uptime: 100.0% compliance: 100% checks08-11 uptime: 100.0% compliance: 100% checks08-12 uptime: 100.0% compliance: 100% checks08-13 uptime: 100.0% compliance: 100% checksuptimecompliance07-1708-13

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)
07-17 · $0.1907-18 · $0.3707-19 · $0.5207-20 · $0.0107-21 · $0.0307-22 · $0.0407-23 · $0.0007-25 · $0.0207-26 · $0.0107-27 · $0.0307-30 · $0.0008-05 · $0.2008-11 · $0.0008-13 · $0.01peak $0.5207-1708-13

Shared payout address (1 other service). These bars are the full shared address (operator-level), so do not sum them across the services that share it. Where a per-service figure is attributed, the assessment block and the ranking, it is the address total divided pro-quota by the 2 services sharing it: a declared convention, not an individually observed measure.

DISTINCT BUYERS
07-17 · 2 buyers07-18 · 2 buyers07-19 · 2 buyers07-20 · 1 buyer07-21 · 3 buyers07-22 · 2 buyers07-23 · 1 buyer07-25 · 1 buyer07-26 · 2 buyers07-27 · 1 buyer07-30 · 1 buyer08-05 · 1 buyer08-11 · 1 buyer08-13 · 1 buyerpeak 3 buyers07-1708-13

Shared payout address (1 other service). These bars are the full shared address (operator-level), so do not sum them across the services that share it. Per-service buyer and transaction counts are shown whole (integers), not divided; only volume is attributed pro-quota. A declared convention, not an individually observed measure.

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-07-17 · last up 2026-08-13

  • 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
● SLOW 424ms
● OK 150ms
● OK 296ms
● OK 132ms
● OK 122ms
● SLOW 496ms
● SLOW 437ms
● SLOW 538ms
● SLOW 431ms
● OK 200ms
● SLOW 489ms
● SLOW 438ms
● SLOW 448ms
● OK 277ms
● OK 213ms
● SLOW 954ms
● SLOW 715ms
● OK 375ms
18 of 2,443 checks · live count

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