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silverback-x402.onrender.com

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Searchoffline · HTTP 503eip155:8453Exactvia cdp
https://silverback-x402.onrender.com/api/v1/swap
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
$24.12
Verified settled volume
1,713 settlements proven x402 by their on-chain EIP-3009 marker.
$0.050
Listed price
As published in the catalog. Always read the live 402 before paying.
0
Calls · 30d
Upstream's own call count for this endpoint, not ours.
0
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xD34411a70EffbDd000c529bbF572082ffDcF1794

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

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider
Coming soonSilverbackERC-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.

0.05USDC≈ $0.05 USD
on Base · exact scheme

Pay 0.05 USDC on Base to 0xD344…F1794. The signed payment is good for 5 minutes.

Paid to
0xD344…F1794
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
50000 smallest units
50000units
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
4HVvnh…UcVSe
Token contract
EPjFWd…TDt1v
Payment window
5 minutes
50000units
on eip155:1187947933 · 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
0xD344…F1794
Token contract
0x8588…FCb20
Payment window
5 minutes
50000units
on keeta:main · keeta-usdc 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
keeta_…qkjci
Token contract
USDC
Payment window
5 minutes
Buys
Token swap via 0x Permit2. You sign EIP-712 data, append signature to tx, and broadcast. Response includes step-by-step instructions with code examples.
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xD34411a70EffbDd000c529bbF572082ffDcF1794",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"
    },
    "payTo": "4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe",
    "amount": "50000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20",
    "extra": {
      "name": "USD Coin",
      "version": "1"
    },
    "payTo": "0xD34411a70EffbDd000c529bbF572082ffDcF1794",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:1187947933",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "USDC",
    "extra": {
      "symbol": "USDC",
      "nodeUrl": "https://api.keeta.com",
      "decimals": 6,
      "serverAddress": "keeta_aabwgiqyij4scwktdoczzvhpi33btieeses5sezeqzqmpi5ik76ttyegwuvfsai",
      "permissionSetupUrl": "/api/v1/keeta/setup-permission"
    },
    "payTo": "keeta_aabaolle2k3hceayy4vkyw7smgl35o5wbqeebt2fibyx5sxxodneqb2rmwqkjci",
    "amount": "50000",
    "scheme": "keeta-usdc",
    "network": "keeta:main",
    "expiresAt": 1771370264672,
    "paymentId": "3e0496ed-02cb-4568-8386-ab71bd046200",
    "amountHuman": "0.050000",
    "description": "Token swap via 0x Permit2. You sign EIP-712 data, append signature to tx, and broadcast. Response includes step-by-step instructions with code examples.",
    "tokenAddress": "keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna",
    "maxTimeoutSeconds": 300,
    "requiresPermission": true
  }
]

Extensions

{
  "bazaar": {
    "icon": "https://www.silverbackdefi.app/assets/silverback%20token.png",
    "info": {
      "input": {
        "body": {
          "tokenIn": "WETH",
          "amountIn": "0.1",
          "tokenOut": "USDC",
          "walletAddress": "0xYourWallet"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "data": {
            "checks": {
              "permit2Approved": true,
              "balanceSufficient": true
            },
            "permit2": {
              "eip712": {
                "types": {},
                "domain": {},
                "message": {},
                "primaryType": "PermitWitnessTransferFrom"
              }
            },
            "tokenIn": "0x4200000000000000000000000000000000000006",
            "amountIn": "0.1",
            "tokenOut": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "amountOut": "196.78",
            "priceImpact": "< 1%",
            "transaction": {
              "to": "0x...",
              "gas": "300000",
              "data": "0x...",
              "value": "0"
            },
            "instructions": [
              "STEP 1: Sign permit2.eip712 with eth_signTypedData_v4",
              "STEP 2: Append signature (strip 0x) to transaction.data, then broadcast"
            ],
            "minAmountOut": "194.81"
          },
          "success": true
        }
      }
    },
    "logo": "https://www.silverbackdefi.app/assets/silverback%20token.png",
    "tags": [
      "swap",
      "dex",
      "permit2",
      "base",
      "trading",
      "token",
      "exchange"
    ],
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "bodyType",
            "body",
            "method"
          ],
          "properties": {
            "body": {
              "required": [
                "walletAddress",
                "tokenIn",
                "tokenOut",
                "amountIn"
              ],
              "properties": {
                "tokenIn": {
                  "type": "string",
                  "description": "Token to sell (symbol like USDC, WETH, VIRTUAL or 0x address)"
                },
                "amountIn": {
                  "type": "string",
                  "description": "Amount to swap in human-readable units (e.g. '0.1' for 0.1 WETH)"
                },
                "slippage": {
                  "type": "string",
                  "description": "Max slippage % (default: '1')"
                },
                "tokenOut": {
                  "type": "string",
                  "description": "Token to buy (symbol or 0x address)"
                },
                "walletAddress": {
                  "type": "string",
                  "description": "Your wallet address — you will sign the Permit2 data and submit the transaction"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "success"
              ],
              "properties": {
                "data": {
                  "type": "object",
                  "properties": {
                    "checks": {
                      "type": "object",
                      "description": "Pre-flight: balance and Permit2 approval status"
                    },
                    "permit2": {
                      "type": "object",
                      "description": "EIP-712 typed data — sign this with eth_signTypedData_v4"
                    },
                    "transaction": {
                      "type": "object",
                      "description": "Unsigned transaction — append your Permit2 signature to .data before broadcasting"
                    },
                    "instructions": {
                      "type": "array",
                      "description": "Step-by-step instructions with code examples to complete the swap"
                    }
                  },
                  "description": "Permit2 swap package: quote, EIP-712 signing data, unsigned transaction, pre-flight checks, and step-by-step instructions with code examples"
                },
                "success": {
                  "type": "boolean"
                }
              }
            }
          }
        }
      }
    },
    "category": "defi",
    "provider": "Silverback DeFi",
    "description": "Token swap on Base via 0x Permit2 — returns EIP-712 data, unsigned tx, and step-by-step instructions. You sign and submit.",
    "providerUrl": "https://silverbackdefi.app",
    "urlTemplate": "https://x402.silverbackdefi.app/api/v1/swap",
    "discoverable": true,
    "outputSchema": {
      "type": "object",
      "required": [
        "success"
      ],
      "properties": {
        "data": {
          "type": "object"
        },
        "success": {
          "type": "boolean"
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-02-17 23:12Z
Last indexed by Roundhouse
2026-07-23 21:30Z
Last enriched (probe, favicon, geo)
2026-09-12 09:45Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 503
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

Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. 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 silverback-x402.onrender.com 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=silverback-x402.onrender.com'
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://silverback-x402.onrender.com/api/v1/swap, 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.