Roundhouse AI

phion.systems

Independent, prompt-injection-screened, hashed and signed web evidence for AI agents

InferenceLiveeip155:8453Exactvia facilitator:payAI
https://phion.systems/v1/paid/fetch-evidence
Calls · 30d
2↑ 17%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 23 snapshots so far.
$0.77
Verified settled volume
191 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0040
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
Never called
—
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": "4000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 600
    },
    {
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
      "amount": "4000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 600
    },
    {
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
      "amount": "4000",
      "scheme": "exact",
      "network": "eip155:42161",
      "maxTimeoutSeconds": 600
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
      },
      "payTo": "2Yt1wWXY1R498sDh3UMXpcnwT3qUWyZxLqkGQy51yLCp",
      "amount": "4000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 600
    }
  ],
  "resource": {
    "url": "https://phion.systems/v1/paid/fetch-evidence",
    "tags": [
      "web-evidence",
      "research",
      "provenance",
      "ai-agents",
      "x402"
    ],
    "iconUrl": "https://phion.systems/phion-agent.svg",
    "mimeType": "application/json",
    "description": "Independent, prompt-injection-screened, hashed and signed web evidence for AI agents",
    "serviceName": "Web Evidence"
  },
  "extensions": {
    "phion": {
      "mcp": {
        "tool": "fetch_evidence",
        "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."
      ],
      "request": {
        "body": {
          "url": "https://example.com"
        },
        "rule": "Use this valid body shape for both the unsigned quote and signed retry.",
        "method": "POST",
        "contentType": "application/json"
      },
      "service": "web-evidence",
      "version": "2",
      "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/web-evidence",
      "priceUsdc": "0.004",
      "nextAction": {
        "url": "https://phion.systems/v1/paid/fetch-evidence",
        "body": {
          "url": "https://example.com"
        },
        "then": "Select one exact accepts entry, sign locally, and retry this identical request with payment-signature.",
        "action": "request_quote",
        "method": "POST",
        "expectedStatus": 402
      },
      "freePreview": "https://phion.systems/v1/try/web-evidence",
      "paidOutcome": "Observed text, status, hashes, prompt-injection risk and signed receipt.",
      "buyerClients": "https://phion.systems/clients",
      "funnelVersion": "2",
      "valueBoundary": {
        "free": [
          "capability discovery",
          "price and payment terms",
          "representative preview",
          "input example",
          "schema diagnosis",
          "payment diagnosis"
        ],
        "paid": [
          "complete service execution",
          "decision or transformation",
          "signed result or receipt",
          "verifiable delivery evidence"
        ],
        "neverCharged": [
          "malformed input",
          "capability discovery",
          "price quote",
          "payment diagnosis"
        ]
      },
      "directEndpoint": "https://phion.systems/v1/paid/fetch-evidence",
      "commercialModel": {
        "id": "pay_per_result",
        "billing": "pay_per_result",
        "catalog": "https://phion.systems/v1/commercial-models",
        "discoveryFree": true,
        "automaticRecurringCharges": false
      },
      "schemaNormalizer": "https://phion.systems/v1/schema/normalize",
      "supportedNetworks": [
        "eip155:8453",
        "eip155:137",
        "eip155:42161",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "validationBeforeSettlement": true
    },
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "url": "https://example.com"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "discoverable": true
        },
        "output": {
          "type": "json",
          "example": {
            "receipt": {
              "signature": "base64url"
            },
            "evidence": {
              "raw_sha256": "hex",
              "observation": "independently_fetched",
              "prompt_injection": {
                "risk": "low",
                "detected": false
              }
            }
          }
        },
        "inputSchema": {
          "type": "object",
          "required": [
            "url"
          ],
          "properties": {
            "url": {
              "type": "string",
              "format": "uri"
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema"
      }
    }
  },
  "x402Version": 2,
  "paymentGuide": {
    "mcp": {
      "tool": "fetch_evidence",
      "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."
    ],
    "request": {
      "body": {
        "url": "https://example.com"
      },
      "rule": "Use this valid body shape for both the unsigned quote and signed retry.",
      "method": "POST",
      "contentType": "application/json"
    },
    "service": "web-evidence",
    "version": "2",
    "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/web-evidence",
    "priceUsdc": "0.004",
    "nextAction": {
      "url": "https://phion.systems/v1/paid/fetch-evidence",
      "body": {
        "url": "https://example.com"
      },
      "then": "Select one exact accepts entry, sign locally, and retry this identical request with payment-signature.",
      "action": "request_quote",
      "method": "POST",
      "expectedStatus": 402
    },
    "freePreview": "https://phion.systems/v1/try/web-evidence",
    "paidOutcome": "Observed text, status, hashes, prompt-injection risk and signed receipt.",
    "buyerClients": "https://phion.systems/clients",
    "funnelVersion": "2",
    "valueBoundary": {
      "free": [
        "capability discovery",
        "price and payment terms",
        "representative preview",
        "input example",
        "schema diagnosis",
        "payment diagnosis"
      ],
      "paid": [
        "complete service execution",
        "decision or transformation",
        "signed result or receipt",
        "verifiable delivery evidence"
      ],
      "neverCharged": [
        "malformed input",
        "capability discovery",
        "price quote",
        "payment diagnosis"
      ]
    },
    "directEndpoint": "https://phion.systems/v1/paid/fetch-evidence",
    "commercialModel": {
      "id": "pay_per_result",
      "billing": "pay_per_result",
      "catalog": "https://phion.systems/v1/commercial-models",
      "discoveryFree": true,
      "automaticRecurringCharges": false
    },
    "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.

0.004USDC≈ $0.004 USD
on Base · exact scheme

Pay 0.004 USDC on Base to 0x7BEc…071e2. The signed payment is good for 10 minutes.

Paid to
0x7BEc…071e2
USD Coin contract
0x8335…02913
Payment window
10 minutes
As published
4000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x7BEcA68DD9aC733D4de6b16d16B85Dc391c071e2",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 600
  }
]

Provenance

Seen in the source catalog
2026-09-11 15:05Z
Last indexed by Roundhouse
2026-09-25 04:15Z
Last enriched (probe, favicon, geo)
2026-09-14 19:46Z
x402 version
2
Max timeout
600s
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. 23 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 phion.systems 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=phion.systems'
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/fetch-evidence, 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.