Payments on Base + Solana
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checksum.openverbs.com has 4 x402 endpoints in our catalog. Right now: 4 proceed. 4 passed a real paid test: we paid the listed price and got what the listing promised. Best grade: A.
Best grades first. Open an endpoint for its full history: uptime, price and payout-wallet changes, and paid-test results with signed receipts.
| Endpoint | Grade | Verdict | Uptime (7 days) | Response time | Paid test passed |
|---|---|---|---|---|---|
| /v1/adler32 | A | Proceed | 100% | 782 ms | Yes |
| /v1/crc16 | A | Proceed | 100% | 650 ms | Yes |
| /v1/crc32 | A | Proceed | 100% | 730 ms | Yes |
| /v1/fletcher | A | Proceed | 100% | 767 ms | Yes |
4 of checksum.openverbs.com's endpoints are rated Proceed: reliable in monitoring with a stable price and payout wallet, and the best ones delivered in a real paid test. Grades are per endpoint, so look up the one your agent is about to pay.
Lumière PayCheck checks every endpoint about every 30 minutes: does it answer with a valid x402 quote, is the price and payout wallet stable. Then we pay some of them for real and check the response against what the listing promised. Failures are re-tested before they count. How it works.
Yes, for free. Call check_payment (API or MCP) with the endpoint, amount and payTo from the 402 quote, and pay only if it returns allow. Check an endpoint now.