Why is my x402 endpoint broken?
Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readiness, which wallets and agents can pay, Bazaar/OpenAPI discovery and the browser paywall. Returns every check with a fix hint. Read-only: never pays.
Answeringour last check, 2026-09-28
1 of 1checks answered this week
618 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://x402-doctor.fizzl.eu/api/v1/diagnose
| Category | Market data |
|---|---|
| Provider host | x402-doctor.fizzl.eu |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.01 | 618 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"method": "GET",
"url": "https://ichimoku-signal.fizzl.eu/signal/BTC-USDT"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"method": {
"description": "HTTP method of the endpoint. Default: try GET, then POST.",
"enum": [
"GET",
"POST"
],
"type": "string"
},
"url": {
"description": "The x402 endpoint to diagnose (public http(s) URL).",
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"challenge": {
"type": [
"object",
"null"
]
},
"checks": {
"items": {
"properties": {
"group": {
"enum": [
"challenge",
"accepts",
"resource",
"settlement",
"wallets",
"discovery",
"browser"
],
"type": "string"
},
"hint": {
"type": "string"
},
"id": {
"type": "string"
},
"message": {
"type": "string"
},
"status": {
"enum": [
"pass",
"warn",
"fail",
"info",
"skip"
],
"type": "string"
}
},
"required": [
"id",
"status",
"message"
],
"type": "object"
},
"type": "array"
},
"method": {
"enum": [
"GET",
"POST",
null
],
"type": [
"string",
"null"
]
},
"overall": {
"enum": [
"pass",
"warn",
"fail"
],
"type": "string"
},
"url": {
"type": "string"
},
"wallets": {
"description": "Which wallets can pay: per wallet, the networks where payment works (yes) and where it fails, with the reason (no).",
"items": {
"properties": {
"agent": {
"type": "boolean"
},
"no": {
"items": {
"properties": {
"network": {
"type": "string"
},
"reason": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"wallet": {
"type": "string"
},
"yes": {
"items": {
"type": "string"
},
"type": "array"
}
},
"type": "object"
},
"type": "array"
}
},
"required": [
"url",
"overall",
"checks"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}