x402 Dev Tools

Name: x402 Dev Tools
Price: 0.002 USDC

Decodes a PAYMENT-REQUIRED, PAYMENT-SIGNATURE or PAYMENT-RESPONSE header (x402 v2, or X-PAYMENT / X-PAYMENT-RESPONSE of v1), base64 or JSON, detecting which it is. Explains it in plain terms (price in dollars, network, payer and payee, validity window, explorer link) and lists problems: wrong USDC EIP-712 domain, expired or not-yet-valid authorizations, amount or payee mismatches, missing Bazaar extension.

TradingUnknowneip155:8453Exactvia cdp

https://dev.kagurazaka.dev/v1/decode

x402DebuggingPayment headerDeveloper tools

Settlements · 30d

329

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.

$2.02

Verified settled volume

329 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.

Calls · 30d

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

Unique payers · 30d

Last called 2026-10-25 20:35Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xe6f7508ab572a4dc9c7486ea017b100d83f3c3f8

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.

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 0xe6f7…3c3f8. The signed payment is good for 5 minutes.

Paid to: 0xe6f7…3c3f8
USD Coin contract: 0x8335…02913
Payment window: 5 minutes
As published: 2000 smallest units

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xe6f7508ab572a4dc9c7486ea017b100d83f3c3f8",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "header": "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"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "kind": "payment-required",
          "accepts": [
            {
              "pay_to": "0xe6f7508ab572a4dc9c7486ea017b100d83f3c3f8",
              "scheme": "exact",
              "network": "eip155:8453",
              "price_usd": 0.001,
              "network_name": "Base"
            }
          ],
          "decoded": {
            "x402Version": 2
          },
          "summary": "Pay $0.001 on Base for https://api.example.com/v1/weather",
          "findings": [
            {
              "level": "info",
              "message": "no bazaar extension: the CDP Bazaar lists the resource only with it (declareDiscoveryExtension)"
            }
          ],
          "x402_version": 2
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "required": [
                "header"
              ],
              "properties": {
                "kind": {
                  "enum": [
                    "payment-required",
                    "payment-signature",
                    "payment-response",
                    "auto"
                  ],
                  "type": "string",
                  "description": "default auto"
                },
                "header": {
                  "type": "string",
                  "description": "the header value (base64 or JSON); a leading 'Header-Name:' is ignored"
                }
              }
            },
            "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",
              "properties": {
                "kind": {},
                "accepts": {},
                "decoded": {},
                "summary": {},
                "findings": {},
                "x402_version": {}
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-10-25 20:35Z
Last indexed by Roundhouse: 2026-10-26 17:20Z
Last enriched (probe, favicon, geo): —
x402 version: 2
Max timeout: 300s
Liveness probe: Not probed

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

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 Dev Tools 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%20Dev%20Tools'
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://dev.kagurazaka.dev/v1/decode, 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. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

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