Roundhouse

x402 Payment Preflight

Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.

SearchLiveeip155:8453Exactvia cdp
https://api.delx.ai/api/v1/x402/payment-preflight
x402Commercex402-buyer-dxLocal-only
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 28 snapshots so far.
$14.90
Verified settled volume
2,752 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-11 11:55Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x9f8bd9875b3E0b632a24A3A7C73f7787175e73A2

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

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider
Coming soonCHAOS AgentERC-8004

Accepts

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

0.002USDC≈ $0.002 USD
on Base · exact scheme

Pay 0.002 USDC on Base to 0x9f8b…e73A2. The signed payment is good for 5 minutes.

Paid to
0x9f8b…e73A2
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
2000 smallest units
Buys
Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.
Returns
application/json
0.002USDC≈ $0.002 USD
on Base · exact scheme

Pay 0.002 USDC on Base to 0x9f8b…e73A2. The signed payment is good for 5 minutes.

Paid to
0x9f8b…e73A2
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
2000 smallest units
Buys
Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.
Returns
application/json
2000units
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
28heAM…YsemG
Token contract
EPjFWd…TDt1v
Payment window
5 minutes
Buys
Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "app": "Delx Commerce",
      "name": "USD Coin",
      "version": "2",
      "provider": "coinbase",
      "accept_label": "Coinbase CDP",
      "provider_label": "Coinbase CDP",
      "facilitator_url": "https://api.cdp.coinbase.com/platform/v2/x402"
    },
    "payTo": "0x9f8bd9875b3E0b632a24A3A7C73f7787175e73A2",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://api.delx.ai/api/v1/x402/payment-preflight",
    "description": "Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "app": "Delx Commerce",
      "name": "USD Coin",
      "version": "2",
      "provider": "payai",
      "accept_label": "PayAI Base",
      "provider_label": "PayAI Base",
      "facilitator_url": "https://facilitator.payai.network"
    },
    "payTo": "0x9f8bd9875b3E0b632a24A3A7C73f7787175e73A2",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://api.delx.ai/api/v1/x402/payment-preflight",
    "description": "Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "app": "Delx Commerce",
      "name": "USD Coin",
      "version": "2",
      "feePayer": "2wKupLR9q6wXYppw8Gr2NvWxKBUqm4PPJKkQfoxHDBg4",
      "provider": "payai",
      "accept_label": "PayAI Solana",
      "provider_label": "PayAI Solana",
      "facilitator_url": "https://facilitator.payai.network"
    },
    "payTo": "28heAMpFkeUJsL7o7apiK4oJwZWq2fUHinRwbgYYsemG",
    "amount": "2000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://api.delx.ai/api/v1/x402/payment-preflight",
    "description": "Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "requirements": {
            "accepts": [
              {
                "payTo": "0x1111111111111111111111111111111111111111",
                "amount": "1000",
                "scheme": "exact",
                "expires": 1786272600,
                "network": "eip155:8453"
              }
            ]
          },
          "max_amount_usdc": 0.002,
          "allowed_networks": [
            "eip155:8453"
          ],
          "now_epoch_seconds": 1786272500
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "policy": {
            "asset_decimals": 6,
            "expiry_checked": true,
            "max_amount_usdc": "0.002",
            "allowed_networks": [
              "eip155:8453"
            ],
            "min_expiry_seconds": 30
          },
          "schema": "delx/util-x402-payment-preflight/v1",
          "approved": true,
          "selected": {
            "index": 0,
            "pay_to": "0x1111111111111111111111111111111111111111",
            "scheme": "exact",
            "network": "eip155:8453",
            "amount_usdc": "0.001",
            "expiry_status": "ok"
          },
          "evaluations": [
            {
              "index": 0,
              "scheme": "exact",
              "network": "eip155:8453",
              "blockers": [],
              "amount_usdc": "0.001",
              "expiry_status": "ok",
              "pay_to_present": true
            }
          ],
          "eligible_count": 1,
          "evaluated_count": 1
        }
      }
    },
    "tags": [
      "x402",
      "commerce",
      "x402-buyer-dx",
      "local-only"
    ],
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input",
        "output"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "requirements",
                "max_amount_usdc",
                "allowed_networks"
              ],
              "properties": {
                "requirements": {
                  "type": "object"
                },
                "asset_decimals": {
                  "type": "integer",
                  "default": 6,
                  "maximum": 18,
                  "minimum": 0
                },
                "max_amount_usdc": {
                  "type": "number",
                  "minimum": 0
                },
                "allowed_networks": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  },
                  "maxItems": 20,
                  "minItems": 1
                },
                "now_epoch_seconds": {
                  "type": "integer",
                  "minimum": 0
                },
                "min_expiry_seconds": {
                  "type": "integer",
                  "default": 30,
                  "maximum": 86400,
                  "minimum": 0
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "type": "string",
              "const": "POST"
            },
            "bodyType": {
              "type": "string",
              "const": "json"
            }
          }
        },
        "output": {
          "type": "object",
          "properties": {
            "policy": {
              "type": "object",
              "properties": {
                "asset_decimals": {
                  "type": "integer"
                },
                "expiry_checked": {
                  "type": "boolean"
                },
                "max_amount_usdc": {
                  "type": "string"
                },
                "allowed_networks": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                },
                "min_expiry_seconds": {
                  "type": "integer"
                }
              },
              "additionalProperties": true
            },
            "schema": {
              "type": "string"
            },
            "approved": {
              "type": "boolean"
            },
            "selected": {
              "type": "object",
              "properties": {
                "index": {
                  "type": "integer"
                },
                "pay_to": {
                  "type": "string"
                },
                "scheme": {
                  "type": "string"
                },
                "network": {
                  "type": "string"
                },
                "amount_usdc": {
                  "type": "string"
                },
                "expiry_status": {
                  "type": "string"
                }
              },
              "additionalProperties": true
            },
            "evaluations": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "index": {
                    "type": "integer"
                  },
                  "scheme": {
                    "type": "string"
                  },
                  "network": {
                    "type": "string"
                  },
                  "blockers": {
                    "type": "array",
                    "items": {}
                  },
                  "amount_usdc": {
                    "type": "string"
                  },
                  "expiry_status": {
                    "type": "string"
                  },
                  "pay_to_present": {
                    "type": "boolean"
                  }
                },
                "additionalProperties": true
              }
            },
            "eligible_count": {
              "type": "integer"
            },
            "evaluated_count": {
              "type": "integer"
            }
          },
          "description": "Bounded first-party Commerce JSON result; input is processed in memory and not retained.",
          "additionalProperties": true
        }
      }
    },
    "summary": "Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.",
    "category": "api-integration",
    "coverImage": "https://delx.ai/opengraph-image?v=20260305-fox",
    "serviceName": "x402 Payment Preflight"
  }
}

Provenance

Seen in the source catalog
2026-08-11 11:55Z
Last indexed by Roundhouse
2026-09-10 11:50Z
Last enriched (probe, favicon, geo)
2026-09-24 09:45Z
x402 version
2
Max timeout
300s
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. 28 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 x402 Payment Preflight 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=x402%20Payment%20Preflight'
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://api.delx.ai/api/v1/x402/payment-preflight, 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.