Spraay Compute & Futures

Pay-per-call GPU rental and AI inference (LLM, image, video, TTS, STT, embeddings) via Spraay x402 gateway. USDC micropayments on Base/Solana. Prepaid compute-futures with bulk discounts up to 15%. Keyless, agent-native — no API keys, no signup.

Two capabilities, equal billing:

1. Compute rental — pay-per-call GPU and model inference (LLM, image, video, TTS, STT, embeddings) via the Spraay x402 gateway. One HTTP request, one USDC payment, the result comes back. No keys, no signup.
2. Compute futures — prepay USDC into a credit balance and draw it down per job at a tier discount (up to 15%). Settle once, run many jobs with no per-call payment, refund whatever is left.

Everything settles in USDC over x402 V2 on Base mainnet and Solana mainnet. The gateway returns a standard HTTP 402 Payment Required with payment requirements; the agent pays via its x402 client and retries. Base address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC); Solana mint EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v.

Base URL: https://gateway.spraay.app

⚠️ Before you install — real money warning

Every paid call in this skill spends real USDC from a funded on-chain wallet. This is not a testnet, sandbox, or simulated environment.

• Wallet charges: Each compute call debits USDC from your agent's wallet via the x402 payment protocol. Costs range from $0.001 to $0.50 per call.
• Compute futures deposits: The deposit endpoint locks real USDC (minimum $10) into a prepaid credit balance. This is an on-chain transaction that commits funds.
• Irreversible payments: x402 payments are on-chain USDC transfers. Once settled, they cannot be reversed. Compute futures refunds return unused balance but cannot recover funds already spent on jobs.
• Autonomous spending risk: If this skill is installed on an agent with a funded wallet, it may trigger paid calls based on user requests. Always require explicit human approval before any paid operation, especially deposits.

Recommendations:

• Use a dedicated wallet with limited funds
• Always call the free compute/estimate or compute/models endpoint first to check cost
• Set a per-session spending cap if your agent framework supports it
• Require human confirmation before compute-futures/deposit (locks funds)

When to use this skill

Use this skill when the user explicitly requests GPU compute, model inference, or Spraay-specific operations:

• Explicit Spraay/x402 references — "run this through Spraay", "use x402 compute", "call the Spraay gateway"
• GPU rental — "rent a GPU to run this model", "run this Replicate model"
• Compute futures — "prepay compute credits", "check my compute balance", "deposit into compute futures"
• Specific inference via this gateway — "generate an image via Spraay", "transcribe this audio through the x402 gateway"

Note: Generic phrases like "generate an image" or "run inference" do not necessarily mean this skill should handle them — the user may prefer a local model, a free provider, or a different service. Only activate this skill when the user has indicated they want to use the Spraay x402 gateway or when this is the only available compute provider.

When to use which billing mode

• One-off or low-volume job → call the relevant compute endpoint directly and pay per call.
• Repeated jobs / known budget / cost-sensitive agent → open a compute-futures account once, then execute against the balance. Cheaper (tier discount), and each job costs only a $0.001 settlement instead of the full per-call gate price.
• Unsure of cost → hit POST /api/v1/compute/estimate (free) first, or GET /api/v1/compute-futures/pricing ($0.001) for tier and per-model costs.

The x402 flow (how every paid call works)

1. Agent sends the request (e.g. POST /api/v1/compute/text-inference).
2. Gateway responds 402 Payment Required with accepts (price, network, payTo).
3. Agent's x402 client signs an EIP-3009 (Base) or SPL (Solana) USDC authorization for the quoted amount.
4. Agent retries with the X-PAYMENT header (Base) / X-Solana-Tx header (Solana).
5. Gateway verifies/settles via the facilitator and returns the result.

Any x402-aware client handles this automatically (@x402/fetch, x402-axios, the Spraay MCP server, or an OpenClaw payment skill such as ClawPay/Vault-0). The agent only needs a funded wallet.

Quick endpoint reference

Prices below are the x402 gate price per call (what the agent pays at the 402). Free endpoints need no payment — use free endpoints first to plan before spending.

GPU / Compute rental

Endpoint	Method	Price	Purpose
/api/v1/gpu/run	POST	$0.06	Run any Replicate model (image, video, LLM, audio, utility)
/api/v1/gpu/status/:id	GET	$0.005	Poll an async GPU prediction
/api/v1/gpu/models	GET	free	List GPU model shortcuts

Model inference

Endpoint	Method	Price	Purpose
/api/v1/compute/text-inference	POST	$0.03	LLM chat/completion — 11 models 3B–405B (Chutes AI / Bittensor SN64, OpenRouter)
/api/v1/compute/image-generation	POST	$0.03	Text-to-image — FLUX Schnell/Dev/Pro, SDXL
/api/v1/compute/video-generation	POST	$0.50	Text-to-video — MiniMax Video 01, Wan 2.1 (async)
/api/v1/compute/text-to-speech	POST	$0.03	TTS / voice synthesis
/api/v1/compute/speech-to-text	POST	$0.02	Whisper Large V3 transcription, 100+ languages
/api/v1/compute/embeddings	POST	$0.005	Text/vector embeddings for RAG and semantic search
/api/v1/compute/batch	POST	$0.05	Up to 50 mixed jobs in one payment, 10% batch discount
/api/v1/compute/status/:jobId	GET	$0.001	Poll an async compute job (video, batch items)
/api/v1/compute/models	GET	free	List all compute models with pricing
/api/v1/compute/estimate	POST	free	Estimate cost before committing

Compute futures (prepaid credits) — ⚠️ deposits lock real USDC

Endpoint	Method	Price	Purpose
/api/v1/compute-futures/deposit	POST	$0.01	Open a prepaid credit account. Tiers: $10+ (5%), $50+ (10%), $200+ (15%)
/api/v1/compute-futures/balance	GET	$0.001	Balance, tier, discount, usage stats
/api/v1/compute-futures/execute	POST	$0.001	Run a job, deduct from balance (no per-call x402, discount applied)
/api/v1/compute-futures/history	GET	$0.002	Full usage ledger
/api/v1/compute-futures/refund	POST	$0.01	Refund unused balance to the depositor
/api/v1/compute-futures/pricing	GET	$0.001	Tier discounts, per-model costs, bulk-discount info

For exact request/response schemas, required fields, and model lists, read references/endpoints.md. For runnable end-to-end examples (per-call and the full futures lifecycle), read examples/quickstart.md.

Headline workflows

Rent compute (per-call), e.g. LLM inference

⚠️ This example costs $0.03 USDC when executed.

text

POST /api/v1/compute/text-inference
{ "messages": [{ "role": "user", "content": "Summarize this contract: ..." }], "model": "auto" }
→ 402 → pay $0.03 USDC → retry → { provider, model, choices: [...], usage, price_usdc }

Run a GPU model on Replicate

⚠️ This example costs $0.06 USDC when executed.

text

POST /api/v1/gpu/run
{ "model": "flux-pro", "input": { "prompt": "a serene mountain lake at sunset" } }
→ 402 → pay $0.06 USDC → retry → { id, status, model, output: ["https://replicate.delivery/..."] }

Compute futures lifecycle (prepay → draw down → refund)

⚠️ The deposit step below locks $50 real USDC on-chain. Do not run this example without confirming the amount with the user.

text

POST /api/v1/compute-futures/deposit   { "depositor": "0xYou", "amount": "50" }
  → pay $0.01 → { computeFuture: { id: "CFE-ABC12345", tier: "scale", discount: "10% discount", balanceRemaining: "50 USDC" } }
POST /api/v1/compute-futures/execute   { "futuresId": "CFE-ABC12345", "type": "text-inference", "messages": [...] }
  → pay $0.001 → { billing: { charged: "$0.027", balanceRemaining: "$42.473 USDC" }, compute: { model: "Llama 3.3 70B" } }
POST /api/v1/compute-futures/refund    { "futuresId": "CFE-ABC12345", "caller": "0xYou" }
  → pay $0.01 → { refund: { refundAmount: "42.50 USDC", jobsExecuted: 15 } }

Rules and gotchas

• Async endpoints (video-generation, some batch items) return a prediction_id / poll_url. Poll /compute/status/:jobId until status: "completed".
• execute only deducts from a prepaid balance — it does not run a per-call x402 payment for the compute itself; you only pay the $0.001 settlement. Make sure the futures account has enough balance or the job is rejected.
• Refunds are depositor-only. caller must equal the original depositor.
• Use auto for model when you don't care which model serves the request; the gateway routes to a sensible default for that job type.
• Free before paid. compute/estimate, compute/models, gpu/models, and /.well-known/x402.json cost nothing — use them to plan a call before spending.
• Discovery: the gateway publishes a machine-readable catalog at https://gateway.spraay.app/.well-known/x402.json. Point a discovery-driven agent there to enumerate live endpoints and prices.
• Human approval required for compute-futures/deposit (locks funds) and any operation the user has not explicitly requested.

Changelog

v1.1.0

• Added YAML frontmatter permissions — declared bins: [bash, curl] under metadata.openclaw.requires to match actual runtime dependencies. Fixes "MCP Least Privilege" audit finding.
• Added real-money USDC warning — prominent disclosure that all paid calls spend real USDC from a funded wallet, including privacy and billing risk notes. Fixes 3 "Missing User Warnings" findings.
• Narrowed trigger guidance — replaced broad activation phrases with specific criteria requiring explicit Spraay/x402 references. Fixes "Vague Triggers" audit finding.
• Added cost warnings to examples — every quickstart and inline example now shows the USDC cost before the code block so agents don't auto-fire paid calls without disclosure.
• Added human approval rules — compute-futures/deposit and any unprompted paid operation now require explicit user confirmation.
• Updated description — tighter, keyword-rich, accurate capability disclosure within 300-char limit.

v1.0.0

• Initial release with 20 endpoints across GPU rental, model inference, and compute futures.

Related terms

GPU rental, serverless inference, pay-per-call AI, USDC compute payments, x402 micropayments, agent compute provider, Replicate GPU proxy, prepaid inference credits, bulk compute discount, keyless model access, Base chain, Solana, autonomous agent payments, machine-payable API

Provenance

This skill wraps the Spraay x402 Gateway compute surface (GPU/Compute, Compute Services, and Compute Futures / Category 22). Prices reflect the live gateway gate prices in USDC. If the gateway updates pricing or adds models, regenerate references/endpoints.md from /.well-known/x402.json.