Subscription Spend Guard

Name: Subscription Spend Guard
Price: 0.003 USDC
Availability: InStock

Enforce recurring period budgets

OtherLiveeip155:8453Exactvia cdp

https://phion.systems/v1/paid/trust/subscription-spend-guard

Ai-agentsTrustRiskEvidencex402

Calls · 30d

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 11 snapshots so far.

$0.77

Verified settled volume

190 settlements proven x402 by their on-chain EIP-3009 marker.

$0.0030

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-09-15 22:08Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
      "amount": "3000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
      "amount": "3000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
      "amount": "3000",
      "scheme": "exact",
      "network": "eip155:42161",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
      },
      "payTo": "2Yt1wWXY1R498sDh3UMXpcnwT3qUWyZxLqkGQy51yLCp",
      "amount": "3000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://phion.systems/v1/paid/trust/subscription-spend-guard",
    "tags": [
      "ai-agents",
      "trust",
      "risk",
      "evidence",
      "x402"
    ],
    "iconUrl": "https://phion.systems/phion-agent.svg",
    "mimeType": "application/json",
    "description": "Enforce recurring period budgets",
    "serviceName": "Subscription Spend Guard"
  },
  "extensions": {
    "phion": {
      "mcp": {
        "tool": "subscription_spend_guard",
        "endpoint": "https://phion.systems/mcp"
      },
      "steps": [
        {
          "step": 1,
          "action": "Send the intended request without a payment signature and read HTTP 402."
        },
        {
          "step": 2,
          "action": "Choose exactly one entry from accepts; do not modify network, asset, amount or payTo."
        },
        {
          "step": 3,
          "action": "Sign the selected x402 v2 requirement locally with a compatible buyer client."
        },
        {
          "step": 4,
          "action": "Retry the identical method, URL and JSON body with the payment-signature header."
        },
        {
          "step": 5,
          "action": "On HTTP 200, verify payment-response and the signed PHION result."
        }
      ],
      "safety": [
        "Never send a private key or seed phrase to PHION.",
        "Signing happens locally in the buyer wallet or x402 client.",
        "A quote is not a charge; payment is recorded only after successful settlement."
      ],
      "service": "subscription-spend-guard",
      "version": "1",
      "coreFlow": [
        {
          "action": "quote",
          "instruction": "POST the valid request without payment-signature and read HTTP 402."
        },
        {
          "action": "authorize",
          "instruction": "Choose one exact accepts entry and sign it locally with an x402 v2 client."
        },
        {
          "action": "execute",
          "instruction": "Retry the identical request with payment-signature; on 200 verify payment-response and the PHION receipt."
        }
      ],
      "diagnose": "https://phion.systems/v1/payment/diagnose",
      "fullGuide": "https://phion.systems/v1/payment-guide/subscription-spend-guard",
      "priceUsdc": "0.003",
      "nextAction": "Select one exact accepts entry, sign it with an x402 v2 client, and retry the same POST and JSON body with payment-signature.",
      "freePreview": "https://phion.systems/v1/try/subscription-spend-guard",
      "buyerClients": "https://phion.systems/clients",
      "funnelVersion": "1",
      "directEndpoint": "https://phion.systems/v1/paid/trust/subscription-spend-guard",
      "schemaNormalizer": "https://phion.systems/v1/schema/normalize",
      "supportedNetworks": [
        "eip155:8453",
        "eip155:137",
        "eip155:42161",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "validationBeforeSettlement": true
    },
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "discoverable": true
        },
        "output": {
          "type": "json",
          "example": {
            "receipt": {
              "signature": "base64url"
            },
            "assessment": {
              "risk_band": "review",
              "confidence": 0.5
            }
          }
        },
        "inputSchema": {
          "type": "object",
          "required": [
            "subscription",
            "usage",
            "policy"
          ]
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema"
      }
    }
  },
  "x402Version": 2,
  "paymentGuide": {
    "mcp": {
      "tool": "subscription_spend_guard",
      "endpoint": "https://phion.systems/mcp"
    },
    "steps": [
      {
        "step": 1,
        "action": "Send the intended request without a payment signature and read HTTP 402."
      },
      {
        "step": 2,
        "action": "Choose exactly one entry from accepts; do not modify network, asset, amount or payTo."
      },
      {
        "step": 3,
        "action": "Sign the selected x402 v2 requirement locally with a compatible buyer client."
      },
      {
        "step": 4,
        "action": "Retry the identical method, URL and JSON body with the payment-signature header."
      },
      {
        "step": 5,
        "action": "On HTTP 200, verify payment-response and the signed PHION result."
      }
    ],
    "safety": [
      "Never send a private key or seed phrase to PHION.",
      "Signing happens locally in the buyer wallet or x402 client.",
      "A quote is not a charge; payment is recorded only after successful settlement."
    ],
    "service": "subscription-spend-guard",
    "version": "1",
    "coreFlow": [
      {
        "action": "quote",
        "instruction": "POST the valid request without payment-signature and read HTTP 402."
      },
      {
        "action": "authorize",
        "instruction": "Choose one exact accepts entry and sign it locally with an x402 v2 client."
      },
      {
        "action": "execute",
        "instruction": "Retry the identical request with payment-signature; on 200 verify payment-response and the PHION receipt."
      }
    ],
    "diagnose": "https://phion.systems/v1/payment/diagnose",
    "fullGuide": "https://phion.systems/v1/payment-guide/subscription-spend-guard",
    "priceUsdc": "0.003",
    "nextAction": "Select one exact accepts entry, sign it with an x402 v2 client, and retry the same POST and JSON body with payment-signature.",
    "freePreview": "https://phion.systems/v1/try/subscription-spend-guard",
    "buyerClients": "https://phion.systems/clients",
    "funnelVersion": "1",
    "directEndpoint": "https://phion.systems/v1/paid/trust/subscription-spend-guard",
    "schemaNormalizer": "https://phion.systems/v1/schema/normalize",
    "supportedNetworks": [
      "eip155:8453",
      "eip155:137",
      "eip155:42161",
      "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
    ],
    "validationBeforeSettlement": true
  }
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.003USDC≈ $0.003 USD

on Base · exact scheme

Pay 0.003 USDC on Base to 0x7BEc…071e2. The signed payment is good for 1 minute.

Paid to: 0x7BEc…071e2
USD Coin contract: 0x8335…02913
Payment window: 1 minute
As published: 3000 smallest units

3000units

on Polygon · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 0x7BEc…071e2
Token contract: 0x3c49…c3359
Payment window: 1 minute

3000units

on Arbitrum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 0x7BEc…071e2
Token contract: 0xaf88…e5831
Payment window: 1 minute

3000units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 2Yt1wW…1yLCp
Token contract: EPjFWd…TDt1v
Payment window: 1 minute

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:137",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:42161",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
    },
    "payTo": "2Yt1wWXY1R498sDh3UMXpcnwT3qUWyZxLqkGQy51yLCp",
    "amount": "3000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "POST",
        "bodyType": "json",
        "discoverable": true
      },
      "output": {
        "type": "json",
        "example": {
          "receipt": {
            "signature": "base64url"
          },
          "assessment": {
            "risk_band": "review",
            "confidence": 0.5
          }
        }
      },
      "inputSchema": {
        "type": "object",
        "required": [
          "subscription",
          "usage",
          "policy"
        ]
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema"
    }
  }
}

Provenance

Seen in the source catalog: 2026-09-15 22:08Z
Last indexed by Roundhouse: 2026-09-24 09:10Z
Last enriched (probe, favicon, geo): 2026-09-14 01:45Z
x402 version: 2
Max timeout: 60s
Liveness probe: HTTP 402

Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 11 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service Subscription Spend Guard and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Subscription%20Spend%20Guard'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://phion.systems/v1/paid/trust/subscription-spend-guard, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.