What wallets are supported?

Any EVM-compatible wallet on Tempo. Hardware wallets, software wallets, or programmatically derived keys — anything that can sign a pathUSD transfer works.

Is replay protection built in?

Yes. MPP payment credentials are cryptographically bound to the target request, so a credential captured from one call cannot be reused on another.

What if processing fails after payment?

The failure is logged with your wallet address and transaction hash for manual review. Contact support with your transaction hash. There is no automatic refund.

How do I test without spending real pathUSD?

Use the Tempo testnet. Point your mppx client at the testnet, fund a testnet wallet, and run your full MPP payment flow at no cost.

Is there a rate limit for agents?

Unpaid discovery requests (the first 402 probe) are rate-limited at 30 per minute per IP. Paid requests that carry a valid Authorization: Payment header have no rate limit.

Background Removal for AI Agents — MPP API | Clear Canvas

AI agents built on the MPP ecosystem need to manipulate images as part of their workflows. Traditional APIs require OAuth, API keys, and subscription setup — barriers that break autonomous operation. The Clear Canvas MPP API eliminates all of that: any agent with a funded Tempo wallet can remove image backgrounds in a single HTTP round-trip, paying per image with pathUSD and no prior registration.

Why Use Clear Canvas

No API key or account — just a wallet on Tempo (mainnet or testnet)
Deterministic pricing — always $0.05 pathUSD per image, no surprise fees
MPP replay protection — each payment credential is bound to one request
Stateless — no sessions or auth tokens for your agent to manage
Any language — Python, TypeScript, Go, Rust, or anything that speaks HTTP
Testnet available — test on Tempo testnet before spending real pathUSD

How It Works

1
Fund a Tempo wallet with pathUSD
Your agent needs a wallet on Tempo with enough pathUSD to pay for images. Tempo is EVM-compatible, so any EVM wallet library works. Create and fund it programmatically.
2
POST your image — receive HTTP 402
Send a raw PNG, JPEG, or WebP as the request body. The API returns HTTP 402 with a WWW-Authenticate: Payment challenge containing the amount, currency, and network details.
3
Sign and submit the pathUSD payment
Use the mppx SDK (TypeScript) or mpp client (Python) to sign a pathUSD transfer for $0.05 and encode it as an Authorization: Payment header. The payment is cryptographically bound to this specific request.
4
Resend with Authorization: Payment — receive image
Resend the identical POST with the Authorization: Payment header attached. On successful payment verification, the API returns the background-removed image as PNG or WebP.

Frequently Asked Questions

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Ready to Get Started?

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