Roundhouse AI

Otto AI

Decode and explain any EVM blockchain transaction across 11 chains (Base, Ethereum, Arbitrum, Optimism, Avalanche, Polygon, Mantle, Monad, Plasma, BSC, Hyperliquid). Get a human-readable summary of swaps, transfers, approvals, DeFi interactions, and more.

TradingLiveeip155:8453Exactvia cdp
https://x402.ottoai.services/tx-explainer
Transaction explainerTx decoderBlockchain transactionEvm
Calls · 30d
5→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 25 snapshots so far.
$28.39
Verified settled volume
A floor: summed over 5,000 of up to 140,629 indexed settlements. The exact verified count is not computed for a wallet this size.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-09-03 13:42Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808

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.

{
  "docs": "https://docs.useotto.xyz/getting-started/agent-quickstart",
  "hint": "This is a pay-per-call x402 endpoint. The payment terms are the accepts[] array in this body — mirrored verbatim from the base64 PAYMENT-REQUIRED response header, which remains the x402 v2 protocol contract. Pay one of them with an x402 client, then retry to receive the data.",
  "error": "payment_required",
  "price": "$0.01",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "assetTransferMethod": "permit2"
      },
      "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
      },
      "payTo": "6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 300
    }
  ],
  "contact": {
    "email": "admin@useotto.xyz",
    "twitter": "https://twitter.com/useOttoAI",
    "feedback": "POST https://x402.ottoai.services/feedback ($0.001) — money-back guarantee on Otto-recommended services and Full Auto; feature requests welcome (email/Telegram are free).",
    "telegram": "https://t.me/DeFAI_Capital"
  },
  "x402Version": 2
}

Accepts

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

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0x0E84…6b808. The signed payment is good for 5 minutes.

Paid to
0x0E84…6b808
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
10000 smallest units
0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0x0E84…6b808. The signed payment is good for 5 minutes.

Paid to
0x0E84…6b808
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
10000 smallest units
10000units
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
6XcSfq…TDPN5
Token contract
EPjFWd…TDt1v
Payment window
5 minutes
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "assetTransferMethod": "permit2"
    },
    "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
    },
    "payTo": "6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5",
    "amount": "10000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "chain": "base",
          "txHash": "0x91985d4134da826cd05ee7e629b68f0d3ebbbe14198c7d98a4f9e50c1ff46041",
          "outputLevel": "summary"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "chain": "Base",
          "status": "success",
          "txHash": "0x...",
          "summary": "Swapped 0.5 ETH for 1,247.83 USDC via Uniswap V3",
          "explorerUrl": "https://basescan.org/tx/0x..."
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "txHash"
              ],
              "properties": {
                "chain": {
                  "enum": [
                    "base",
                    "ethereum",
                    "arbitrum",
                    "optimism",
                    "avalanche",
                    "polygon",
                    "mantle",
                    "monad",
                    "plasma",
                    "bsc",
                    "hyperliquid"
                  ],
                  "type": "string",
                  "description": "Blockchain network (default: base). 11 EVM chains supported."
                },
                "txHash": {
                  "type": "string",
                  "pattern": "^0x[a-fA-F0-9]{64}$",
                  "description": "Transaction hash (0x-prefixed, 64 hex characters)"
                },
                "outputLevel": {
                  "enum": [
                    "summary",
                    "detailed"
                  ],
                  "type": "string",
                  "description": "'summary' = one-liner, 'detailed' = full breakdown"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "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": [
                "status"
              ],
              "properties": {
                "chain": {
                  "type": "string",
                  "description": "Blockchain name"
                },
                "error": {
                  "type": "string",
                  "description": "Error message if failed"
                },
                "status": {
                  "enum": [
                    "success",
                    "failed"
                  ],
                  "type": "string"
                },
                "txHash": {
                  "type": "string",
                  "description": "Transaction hash"
                },
                "details": {
                  "type": "object",
                  "description": "Structured decode — from, to, value, method, selector, signature, pattern, events (always included; interpretation prose only when outputLevel=detailed)"
                },
                "summary": {
                  "type": "string",
                  "description": "Human-readable transaction summary"
                },
                "explorerUrl": {
                  "type": "string",
                  "description": "Link to block explorer"
                }
              }
            }
          }
        }
      }
    }
  },
  "builder-code": {
    "info": {
      "a": "bc_hc2dhq09"
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "a": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "App builder code"
        },
        "s": {
          "type": "array",
          "items": {
            "type": "string",
            "pattern": "^[a-z0-9_]{1,32}$"
          },
          "description": "Service builder codes"
        },
        "w": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "Wallet builder code"
        }
      },
      "additionalProperties": false
    }
  },
  "offer-receipt": {
    "info": {
      "offers": [
        {
          "format": "eip712",
          "payload": {
            "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
            "amount": "10000",
            "scheme": "exact",
            "network": "eip155:8453",
            "version": 1,
            "validUntil": 1788443224,
            "resourceUrl": "https://x402.ottoai.services/tx-explainer"
          },
          "signature": "0x57d0c104f3eee6de6209e021d91c01877117374f786234e1f8fc93f61e53e1c2360c44e75e8c325c05ec01fdac490552ce100b76ec677aad1eb45b1ca0a2e36f1c",
          "acceptIndex": 0
        },
        {
          "format": "eip712",
          "payload": {
            "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
            "amount": "10000",
            "scheme": "exact",
            "network": "eip155:8453",
            "version": 1,
            "validUntil": 1788443224,
            "resourceUrl": "https://x402.ottoai.services/tx-explainer"
          },
          "signature": "0x57d0c104f3eee6de6209e021d91c01877117374f786234e1f8fc93f61e53e1c2360c44e75e8c325c05ec01fdac490552ce100b76ec677aad1eb45b1ca0a2e36f1c",
          "acceptIndex": 1
        },
        {
          "format": "eip712",
          "payload": {
            "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
            "payTo": "6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5",
            "amount": "10000",
            "scheme": "exact",
            "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
            "version": 1,
            "validUntil": 1788443224,
            "resourceUrl": "https://x402.ottoai.services/tx-explainer"
          },
          "signature": "0xfa0b66d5e0005c31d652b0cb1c2452cf9a67e6e6102c68bd02b2afa21cd71e8a00e5d06a05089e6a782790d8ab9c6510945c5310daf186518a54346b521216e41c",
          "acceptIndex": 2
        }
      ]
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "offers"
      ],
      "properties": {
        "offers": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "format",
              "signature"
            ],
            "properties": {
              "format": {
                "type": "string"
              },
              "payload": {
                "type": "object",
                "required": [
                  "version",
                  "resourceUrl",
                  "scheme",
                  "network",
                  "asset",
                  "payTo",
                  "amount"
                ],
                "properties": {
                  "asset": {
                    "type": "string"
                  },
                  "payTo": {
                    "type": "string"
                  },
                  "amount": {
                    "type": "string"
                  },
                  "scheme": {
                    "type": "string"
                  },
                  "network": {
                    "type": "string"
                  },
                  "version": {
                    "type": "integer"
                  },
                  "validUntil": {
                    "type": "integer"
                  },
                  "resourceUrl": {
                    "type": "string"
                  }
                }
              },
              "signature": {
                "type": "string"
              },
              "acceptIndex": {
                "type": "integer"
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-03 13:42Z
Last indexed by Roundhouse
2026-09-24 21:30Z
Last enriched (probe, favicon, geo)
2026-09-20 16:15Z
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. 25 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 Otto AI 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=Otto%20AI'
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://x402.ottoai.services/tx-explainer, 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.