api-production-853c.up.railway.app
MatrixFold X API failure explainer for AI agents. Classifies failed X create-post responses into auth, permission, rate-limit, payload, media, duplicate, transient, or unknown and returns retry guidance and repair hints.
MediaLiveeip155:8453Exactvia cdp
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
$0.12
Verified settled volume
17 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0040
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 2026-05-21 15:29Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x118FaE85e5E44a92a1A2b3ED1F16DF3ecAB4Ce58The 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.
0.004USDC≈ $0.004 USD
on Base · exact scheme
Pay 0.004 USDC on Base to 0x118F…4Ce58. The signed payment is good for 5 minutes.
- Paid to
- 0x118F…4Ce58
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 4000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x118FaE85e5E44a92a1A2b3ED1F16DF3ecAB4Ce58",
"amount": "4000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"status": 403,
"platform": "x",
"apiProfile": "x_api_v2_create_tweet",
"requestBody": {
"text": "MatrixFold checks X post payloads before an agent calls POST /2/tweets. #AI #Agent"
},
"errorMessage": "Forbidden: OAuth token is missing required permission for creating posts.",
"responseBody": {
"title": "Forbidden",
"detail": "The authenticated user is not permitted to create this Post."
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"summary": "X rejected the request because the token, app, account, or API plan is not allowed to create this post.",
"platform": "x",
"retryable": false,
"apiProfile": "x_api_v2_create_tweet",
"reasonCode": "X_PERMISSION_OR_PLAN_BLOCKED",
"repairHints": [
"Do not retry the same request until account or permission state changes."
],
"retryPolicy": {
"safeToRetry": false,
"doNotRetrySamePayload": false
},
"classification": "permission",
"suggestedAction": "Check OAuth permissions, app access level, account status, and API plan before retrying."
}
}
},
"schema": {
"type": "object",
"$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": [
"platform",
"status"
],
"properties": {
"status": {
"type": "integer",
"maximum": 599,
"minimum": 100
},
"platform": {
"enum": [
"x"
],
"type": "string"
},
"errorCode": {
"type": "string",
"maxLength": 160
},
"apiProfile": {
"enum": [
"x_api_v2_create_tweet"
],
"type": "string"
},
"requestBody": {
"type": "object",
"description": "Request body sent to X when the failure occurred."
},
"errorMessage": {
"type": "string",
"maxLength": 2000
},
"responseBody": {
"type": "object",
"description": "Raw downstream X API error body."
}
}
},
"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": [
"platform",
"apiProfile",
"classification",
"retryable",
"reasonCode",
"summary",
"suggestedAction",
"repairHints",
"retryPolicy"
],
"properties": {
"summary": {
"type": "string"
},
"platform": {
"enum": [
"x"
],
"type": "string"
},
"retryable": {
"type": "boolean"
},
"apiProfile": {
"enum": [
"x_api_v2_create_tweet"
],
"type": "string"
},
"reasonCode": {
"type": "string"
},
"repairHints": {
"type": "array",
"items": {
"type": "string"
}
},
"retryPolicy": {
"type": "object"
},
"classification": {
"enum": [
"auth",
"permission",
"rate_limit",
"payload",
"media",
"duplicate",
"transient",
"unknown"
],
"type": "string"
},
"suggestedAction": {
"type": "string"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-05-21 15:29Z
- Last indexed by Roundhouse
- 2026-06-15 08:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-12 20:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 404
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.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service api-production-853c.up.railway.app 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=api-production-853c.up.railway.app' 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-production-853c.up.railway.app/v1/explain-failure, 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.