Umbra
Private LLM inference, OpenAI-compatible. Sealed open models in TDX + GPU enclaves or Claude; streaming and tool calling; signed Ed25519 receipt naming the attested enclaves; zero retention. Pay per request in USDG, USDC (Base, Solana) or UMBRA.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x036CbD53842c5426634e7929541eC2318f3dCF7e
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.
Pay 0.0001 USDC on Base Sepolia to 0x8B89…8dd92. The signed payment is good for 2.1 minutes.
- Paid to
- 0x8B89…8dd92
- USD Coin (Base Sepolia) contract
- 0x036C…dCF7e
- Payment window
- 2.1 minutes
- As published
- 100 smallest units
The catalog’s raw entry
[
{
"asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0x8B89C727ad99c664A79e761B4A309A92b658dd92",
"amount": "100",
"scheme": "exact",
"network": "eip155:84532",
"maxTimeoutSeconds": 124
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"model": "deepseek/deepseek-v4-flash-0731",
"messages": [
{
"role": "user",
"content": "In one sentence, what is HTTP 402?"
}
],
"max_tokens": 300
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"umbra": {
"receipt": {
"cost": {
"settled": "0.000045",
"currency": "USDG"
},
"tier": "sealed",
"model": "deepseek/deepseek-v4-flash-0731",
"retained": {
"prompt_bytes": 0,
"response_bytes": 0
},
"attestation": {
"gateway": {
"tee": "tdx"
},
"model_runtime": {
"tee": "tdx+gpu"
}
}
},
"signature": {
"alg": "ed25519"
}
},
"usage": {
"prompt_tokens": 18,
"completion_tokens": 20
},
"choices": [
{
"message": {
"role": "assistant",
"content": "HTTP 402 Payment Required is a status code reserved for digital payment schemes."
},
"finish_reason": "stop"
}
]
}
}
},
"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": [
"model",
"messages"
],
"properties": {
"model": {
"type": "string",
"description": "model id from GET /v1/models (sealed: open models in TDX + GPU enclaves; standard: Claude)"
},
"tools": {
"type": "array",
"description": "OpenAI function tools"
},
"stream": {
"type": "boolean",
"description": "server-sent events; paid upfront, unused ceiling refunded on-chain"
},
"messages": {
"type": "array",
"description": "OpenAI chat messages (system, user, assistant, tool)"
},
"max_tokens": {
"type": "integer",
"description": "output cap; sets the price ceiling quoted in the 402"
}
}
},
"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"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-26 01:00Z
- Last indexed by Roundhouse
- 2026-10-31 07:45Z
- Last enriched (probe, favicon, geo)
- —
- x402 version
- 2
- Max timeout
- 124s
- Liveness probe
- Not probed
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 Umbra 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=Umbra' 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://umbra-inference.app/v1/chat/completions, 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://preview.roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://preview.roundhouseai.io/skill.md first — it is the whole procedure.