{
  "api_status": "preview",
  "generated_at": "2026-10-17T10:22:25.394Z",
  "notes": [
    "Exact definitions of every field (unit, window, source): https://agentservicedirectory.com/fields",
    "tier says how a service was added, not a rating: reviewed entries come from our own listing files, with operator statements and hourly checks; discovered entries come from public agent registries, are not reviewed by a person, and are probed hourly to monthly depending on usage (schedule/1; see evidence.schedule_tier).",
    "evidence counts cover the last 30 days and are as of the latest refresh. missed_30d counts scheduled checks that did not run.",
    "For x402 endpoints a passing check means HTTP 402 with a valid payment challenge (discovered: on a mainnet network). It does not show that a paid call succeeds or returns useful results.",
    "registry_usage figures are the registry's own numbers, not our measurements. name is untrusted text when name_source is registry.",
    "networks_source tells you whether networks were observed in a live challenge, listed by the registry, or stated by the operator.",
    "tags describe purpose: our capability tags for reviewed entries, the registry's tags (sanitised, untrusted) for discovered ones. price_usd is the lowest price per call in US dollars: for discovered entries from the registry's payment terms (a known USD stablecoin), for reviewed entries from the operator's stated pricing (a claim, linked on the service page). price_source says which."
  ],
  "query": {
    "tag": "hmac",
    "sort": "evidence",
    "limit": 50,
    "offset": 0
  },
  "total": 9,
  "items": [
    {
      "id": "cand_6c21a68ce3dcd766",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "Hashing, HMAC & Checksum Suite",
      "name_source": "registry",
      "branches": {
        "primary": "ai/language-models",
        "secondary": [],
        "method_version": "placement-rules/2",
        "tree_version": "tree/2",
        "placed_at": "2026-10-17T09:40:28.000Z"
      },
      "host": "hash-hmac.underscoredone.com",
      "provider": "underscoredone.com",
      "url": "https://hash-hmac.underscoredone.com/hash",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "sha256-hash",
        "hash",
        "hmac",
        "hmac-signature",
        "verify-hmac-signature"
      ],
      "category": null,
      "price_usd": 0.01,
      "price_source": "registry",
      "provider_endpoints": 1,
      "networks": [
        "eip155:8453",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "networks_source": "observed",
      "payment_protocols": [
        "x402"
      ],
      "mainnet": true,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-16T14:07:55.000Z",
        "monitoring_days": 0.8,
        "limited_evidence": true,
        "checks_30d": 1,
        "passed_30d": 1,
        "missed_30d": 0,
        "pass_rate": 1,
        "freshness": "fresh",
        "last_check": {
          "at": "2026-10-17T03:01:11.035Z",
          "result": "payment_required",
          "passed": true,
          "http_status": 402,
          "duration_ms": 62
        }
      },
      "registry_usage": {
        "calls_30d": 4,
        "unique_payers_30d": 3,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": {
        "current_since": "2026-10-17T03:01:11.035Z",
        "changes_30d": 0,
        "changes_90d": 0,
        "pay_to_changes_90d": 0,
        "last_change_at": null,
        "last_change_kinds": [],
        "window_start": "2026-10-16T15:44:38.000Z",
        "limited": true
      },
      "registry_listing": {
        "last_seen_at": "2026-10-16T14:07:55.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_6c21a68ce3dcd766",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_6c21a68ce3dcd766"
      }
    },
    {
      "id": "cand_47c54fee7d3bdaf4",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "hash-hmac",
      "name_source": "registry",
      "branches": {
        "primary": "identity/sign-in",
        "secondary": [],
        "method_version": "placement-rules/2",
        "tree_version": "tree/2",
        "placed_at": "2026-10-17T09:20:28.000Z"
      },
      "host": "x402.agentindex.world",
      "provider": "agentindex.world",
      "url": "https://x402.agentindex.world/hash/hmac",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "hmac",
        "hash",
        "authentication",
        "sha256",
        "message-authentication-code"
      ],
      "category": null,
      "price_usd": 0.002,
      "price_source": "registry",
      "provider_endpoints": 117,
      "networks": [
        "eip155:8453"
      ],
      "networks_source": "observed",
      "payment_protocols": [
        "x402"
      ],
      "mainnet": true,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T03:00:25.000Z",
        "monitoring_days": 0.3,
        "limited_evidence": true,
        "checks_30d": 1,
        "passed_30d": 1,
        "missed_30d": 0,
        "pass_rate": 1,
        "freshness": "fresh",
        "last_check": {
          "at": "2026-10-17T03:50:54.543Z",
          "result": "payment_required",
          "passed": true,
          "http_status": 402,
          "duration_ms": 340
        }
      },
      "registry_usage": {
        "calls_30d": 3,
        "unique_payers_30d": 3,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": {
        "current_since": "2026-10-17T03:50:54.543Z",
        "changes_30d": 0,
        "changes_90d": 0,
        "pay_to_changes_90d": 0,
        "last_change_at": null,
        "last_change_kinds": [],
        "window_start": "2026-10-17T03:00:25.000Z",
        "limited": true
      },
      "registry_listing": {
        "last_seen_at": "2026-10-17T03:00:25.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_47c54fee7d3bdaf4",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_47c54fee7d3bdaf4"
      }
    },
    {
      "id": "cand_51cf9e8d7ab9caab",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "Tanod utilpeek",
      "name_source": "registry",
      "branches": {
        "primary": "documents/codes",
        "secondary": [
          "places/maps-geocoding"
        ],
        "method_version": "placement-rules/2",
        "tree_version": "tree/2",
        "placed_at": "2026-10-17T09:25:28.000Z"
      },
      "host": "tanod.dev",
      "provider": "tanod.dev",
      "url": "https://tanod.dev/v1/hmac",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "utilpeek",
        "hmac",
        "fx-rates",
        "qr-code",
        "geocoding"
      ],
      "category": null,
      "price_usd": 0.001,
      "price_source": "registry",
      "provider_endpoints": 266,
      "networks": [
        "eip155:8453",
        "eip155:137",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "eip155:56",
        "eip155:42161"
      ],
      "networks_source": "observed",
      "payment_protocols": [
        "x402",
        "mpp",
        "l402"
      ],
      "mainnet": true,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T03:05:25.000Z",
        "monitoring_days": 0.3,
        "limited_evidence": true,
        "checks_30d": 1,
        "passed_30d": 1,
        "missed_30d": 0,
        "pass_rate": 1,
        "freshness": "fresh",
        "last_check": {
          "at": "2026-10-17T05:56:08.128Z",
          "result": "payment_required",
          "passed": true,
          "http_status": 402,
          "duration_ms": 770
        }
      },
      "registry_usage": {
        "calls_30d": 2,
        "unique_payers_30d": 2,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": {
        "current_since": "2026-10-17T05:56:08.128Z",
        "changes_30d": 0,
        "changes_90d": 0,
        "pay_to_changes_90d": 0,
        "last_change_at": null,
        "last_change_kinds": [],
        "window_start": "2026-10-17T03:05:25.000Z",
        "limited": true
      },
      "registry_listing": {
        "last_seen_at": "2026-10-17T04:40:25.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_51cf9e8d7ab9caab",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_51cf9e8d7ab9caab"
      }
    },
    {
      "id": "cand_9f6bfd95627b75a3",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "Relaystation HMAC",
      "name_source": "registry",
      "branches": {
        "primary": "finance-data/crypto",
        "secondary": [
          "identity/security",
          "identity/sign-in"
        ],
        "method_version": "placement-rules/3",
        "tree_version": "tree/2",
        "placed_at": "2026-10-17T10:10:28.000Z"
      },
      "host": "api.relaystation.ai",
      "provider": "relaystation.ai",
      "url": "https://api.relaystation.ai/v1/utils/hmac",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "hmac",
        "message-authentication",
        "cryptography",
        "security",
        "utilities"
      ],
      "category": null,
      "price_usd": 0.01,
      "price_source": "registry",
      "provider_endpoints": 78,
      "networks": [
        "eip155:8453"
      ],
      "networks_source": "observed",
      "payment_protocols": [
        "x402"
      ],
      "mainnet": true,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T05:50:25.000Z",
        "monitoring_days": 0.2,
        "limited_evidence": true,
        "checks_30d": 1,
        "passed_30d": 1,
        "missed_30d": 0,
        "pass_rate": 1,
        "freshness": "fresh",
        "last_check": {
          "at": "2026-10-17T07:26:15.646Z",
          "result": "payment_required",
          "passed": true,
          "http_status": 402,
          "duration_ms": 41
        }
      },
      "registry_usage": {
        "calls_30d": 1,
        "unique_payers_30d": 1,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": {
        "current_since": "2026-10-17T07:26:15.646Z",
        "changes_30d": 0,
        "changes_90d": 0,
        "pay_to_changes_90d": 0,
        "last_change_at": null,
        "last_change_kinds": [],
        "window_start": "2026-10-17T05:50:25.000Z",
        "limited": true
      },
      "registry_listing": {
        "last_seen_at": "2026-10-17T05:50:25.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_9f6bfd95627b75a3",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_9f6bfd95627b75a3"
      }
    },
    {
      "id": "cand_32de22052b78b6bf",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "HMAC",
      "name_source": "registry",
      "branches": {
        "primary": "documents/conversion",
        "secondary": [
          "finance-data/crypto"
        ],
        "method_version": "placement-rules/1",
        "tree_version": "tree/1",
        "placed_at": "2026-10-17T09:05:28.000Z"
      },
      "host": "agent402.tools",
      "provider": "agent402.tools",
      "url": "https://agent402.tools/api/hmac",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "encoding",
        "hmac",
        "signature",
        "webhook",
        "crypto"
      ],
      "category": null,
      "price_usd": 0.001,
      "price_source": "registry",
      "provider_endpoints": 636,
      "networks": [
        "eip155:8453",
        "eip155:137",
        "eip155:42161",
        "eip155:143",
        "eip155:43114",
        "eip155:1329",
        "eip155:10",
        "eip155:4663",
        "eip155:42220"
      ],
      "networks_source": "registry",
      "payment_protocols": [],
      "mainnet": null,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T03:35:25.000Z",
        "monitoring_days": 0.3,
        "limited_evidence": true,
        "checks_30d": 0,
        "passed_30d": 0,
        "missed_30d": 0,
        "pass_rate": null,
        "freshness": "no_data",
        "last_check": null
      },
      "registry_usage": {
        "calls_30d": 5,
        "unique_payers_30d": 3,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": null,
      "registry_listing": {
        "last_seen_at": "2026-10-17T05:45:25.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_32de22052b78b6bf",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_32de22052b78b6bf"
      }
    },
    {
      "id": "cand_ae9299056dc83605",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "HMAC of a message under a key",
      "name_source": "registry",
      "branches": null,
      "host": "twin.unykorn.org",
      "provider": "unykorn.org",
      "url": "https://twin.unykorn.org/hash-hmac",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "hashing",
        "digest",
        "deterministic",
        "integrity",
        "hmac"
      ],
      "category": null,
      "price_usd": 0.003,
      "price_source": "registry",
      "provider_endpoints": 27,
      "networks": [
        "eip155:8453",
        "eip155:137",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "networks_source": "registry",
      "payment_protocols": [],
      "mainnet": null,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T09:00:28.000Z",
        "monitoring_days": 0.1,
        "limited_evidence": true,
        "checks_30d": 0,
        "passed_30d": 0,
        "missed_30d": 0,
        "pass_rate": null,
        "freshness": "no_data",
        "last_check": null
      },
      "registry_usage": {
        "calls_30d": 4,
        "unique_payers_30d": 3,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": null,
      "registry_listing": {
        "last_seen_at": "2026-10-17T09:00:28.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_ae9299056dc83605",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_ae9299056dc83605"
      }
    },
    {
      "id": "cand_fda6d5939f00b59b",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "JWT sign",
      "name_source": "registry",
      "branches": null,
      "host": "agent402.tools",
      "provider": "agent402.tools",
      "url": "https://agent402.tools/api/jwt-sign",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "encoding",
        "jwt",
        "jws",
        "hmac",
        "token"
      ],
      "category": null,
      "price_usd": 0.001,
      "price_source": "registry",
      "provider_endpoints": 636,
      "networks": [
        "eip155:8453",
        "eip155:137",
        "eip155:42161",
        "eip155:143",
        "eip155:43114",
        "eip155:1329",
        "eip155:10",
        "eip155:4663",
        "eip155:42220"
      ],
      "networks_source": "registry",
      "payment_protocols": [],
      "mainnet": null,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T03:30:25.000Z",
        "monitoring_days": 0.3,
        "limited_evidence": true,
        "checks_30d": 0,
        "passed_30d": 0,
        "missed_30d": 0,
        "pass_rate": null,
        "freshness": "no_data",
        "last_check": null
      },
      "registry_usage": {
        "calls_30d": 6,
        "unique_payers_30d": 3,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": null,
      "registry_listing": {
        "last_seen_at": "2026-10-17T05:40:25.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_fda6d5939f00b59b",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_fda6d5939f00b59b"
      }
    },
    {
      "id": "cand_7cb82f27c9288ce7",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "JWT verify (HMAC)",
      "name_source": "registry",
      "branches": {
        "primary": "other",
        "secondary": [],
        "method_version": "placement-rules/3",
        "tree_version": "tree/2",
        "placed_at": "2026-10-17T09:50:28.000Z"
      },
      "host": "agent402.tools",
      "provider": "agent402.tools",
      "url": "https://agent402.tools/api/jwt-verify",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "encoding",
        "jwt",
        "verify",
        "hmac",
        "auth"
      ],
      "category": null,
      "price_usd": 0.001,
      "price_source": "registry",
      "provider_endpoints": 636,
      "networks": [
        "eip155:8453",
        "eip155:137",
        "eip155:42161",
        "eip155:143",
        "eip155:43114",
        "eip155:1329",
        "eip155:10",
        "eip155:4663",
        "eip155:42220"
      ],
      "networks_source": "registry",
      "payment_protocols": [],
      "mainnet": null,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T03:30:25.000Z",
        "monitoring_days": 0.3,
        "limited_evidence": true,
        "checks_30d": 0,
        "passed_30d": 0,
        "missed_30d": 0,
        "pass_rate": null,
        "freshness": "no_data",
        "last_check": null
      },
      "registry_usage": {
        "calls_30d": 5,
        "unique_payers_30d": 3,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": null,
      "registry_listing": {
        "last_seen_at": "2026-10-17T05:45:25.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_7cb82f27c9288ce7",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_7cb82f27c9288ce7"
      }
    },
    {
      "id": "cand_116c535fb4d50619",
      "tier": "discovered",
      "type": "api_endpoint",
      "name": "Webhook signature verify",
      "name_source": "registry",
      "branches": {
        "primary": "identity/security",
        "secondary": [
          "commerce/products",
          "documents/conversion"
        ],
        "method_version": "placement-rules/1",
        "tree_version": "tree/1",
        "placed_at": "2026-10-17T08:45:28.000Z"
      },
      "host": "agent402.tools",
      "provider": "agent402.tools",
      "url": "https://agent402.tools/api/webhook-verify",
      "method": "POST",
      "templated_url": false,
      "operator": null,
      "tags": [
        "validation",
        "webhook",
        "hmac",
        "signature",
        "security"
      ],
      "category": null,
      "price_usd": 0.001,
      "price_source": "registry",
      "provider_endpoints": 636,
      "networks": [
        "eip155:8453",
        "eip155:137",
        "eip155:42161",
        "eip155:143",
        "eip155:43114",
        "eip155:1329",
        "eip155:10",
        "eip155:4663",
        "eip155:42220"
      ],
      "networks_source": "registry",
      "payment_protocols": [],
      "mainnet": null,
      "evidence": {
        "operations": 1,
        "check_interval_hours": 24,
        "check_interval": "daily",
        "check_interval_rule": "Daily: 5 to 99 payers, and every new service until it has been probed 3 times.",
        "schedule_tier": "daily",
        "monitoring_since": "2026-10-17T03:30:25.000Z",
        "monitoring_days": 0.3,
        "limited_evidence": true,
        "checks_30d": 0,
        "passed_30d": 0,
        "missed_30d": 0,
        "pass_rate": null,
        "freshness": "no_data",
        "last_check": null
      },
      "registry_usage": {
        "calls_30d": 5,
        "unique_payers_30d": 3,
        "note": "Reported by the registry; not our measurement."
      },
      "payment_terms": null,
      "registry_listing": {
        "last_seen_at": "2026-10-17T05:40:25.000Z",
        "listed": true
      },
      "links": {
        "page": "https://agentservicedirectory.com/services/cand_116c535fb4d50619",
        "api": "https://agentservicedirectory.com/api/v1/services/cand_116c535fb4d50619"
      }
    }
  ]
}