Machine Payments Protocol Tester

Run a Machine Payments Protocol (MPP) conformance test — prove an agent or wallet can complete a real $0.50 USDC payment on Solana and get a shareable "passed" proof. Use when verifying an agent can send (or receive) an on-chain payment, testing an agent's payment integration, or generating a verifiable payment proof. Supports mainnet (real USDC) and devnet (test USDC).

MPP Tester

MPP Tester verifies that an agent can actually move money: it issues a unique $0.50 USDC payment request on Solana, watches the chain, and flips the test to passed once the transfer is confirmed on-chain (via a Helius webhook, with an RPC poll fallback). A passed test is a public, linkable proof.

• Send test (no account needed): your agent pays $0.50 USDC to the test wallet; we confirm receipt.
• Receive test (needs a signed-in account): the service pays $0.50 USDC to your address; unlocked 1 per 3 confirmed sends, per network.

Base URL: https://mpptester.com

Run a send test

The quickest path is the helper script:

# mainnet (real $0.50 USDC) or devnet (test USDC)
scripts/run-test.sh mainnet-beta
scripts/run-test.sh devnet

It starts a test, prints the Solana Pay URL to pay, polls until the result is known, and prints the shareable receipt link. To do it manually:

1. Start the test

curl -s -X POST https://mpptester.com/api/mpp/start \
  -H 'Content-Type: application/json' \
  -d '{"network":"mainnet-beta"}'

Returns:

{
  "reference": "<base58>",
  "network": "mainnet-beta",
  "paymentUrl": "solana:<wallet>?amount=0.5&spl-token=<USDC>&reference=<ref>&...",
  "amountUsdc": 0.5,
  "status": "pending",
  "expiresAt": "<iso8601>"   // tests expire after 30 minutes
}

2. Pay the request

Pay the paymentUrl — a standard Solana Pay transfer request. The reference key in the URL is how the test is correlated to your payment, so the payment must include it (any Solana Pay-compatible wallet or library does this automatically; a manual address-only transfer will not be recognized).

• Agent / programmatic: have your wallet tooling pay the Solana Pay URL (recipient, amount, SPL token, and reference are all encoded in it).
• Human: render the paymentUrl as a QR code and scan it with a Solana Pay wallet (Phantom, Solflare, etc.), or open https://mpptester.com/test/<reference> which shows the QR and live status.

Requires a funded wallet: $0.50 USDC plus a little SOL for fees on the chosen network. On devnet, fund from a faucet first.

3. Poll for the result

curl -s https://mpptester.com/api/mpp/tests/<reference>

status becomes confirmed once the transfer is validated on-chain (amount, token, and recipient checked), or expired after 30 minutes unpaid. On success the response includes txSignature and txUrl (Solscan link).

4. Share the proof

The passing test is viewable and linkable at:

https://mpptester.com/test/<reference>

Receive test (optional)

Proves your agent can receive a payment: the service sends $0.50 USDC to an address you control. This requires a signed-in account (email magic link at https://mpptester.com/signin) and an allowance of 1 receive per 3 confirmed send tests on the same network. From the dashboard: Receive test → pick the network → enter your address → run. (No anonymous API for receive yet.)

Notes

• Networks: mainnet-beta (real USDC, default) or devnet (test USDC). Pick devnet to try the flow without spending real money.
• Each test is exactly $0.50 USDC; one on-chain transaction confirms one test (overpaying or paying twice does not grant extra credit).
• Send tests are anonymous; sign in only to keep a private history or run receive tests.