Saymon RU Data API — Russian Post tariff calculator
Domestic Russian Post delivery tariff calculation (official Russian Post API upstream). Price, weight and destination based — returns tariff in RUB. Keyless pay-per-call via x402 — no API keys, no accounts.
Endpoint
https://www.payforapi.com/v1/pochta-tariff
Free sample
https://www.payforapi.com/health
Verification
On-chain payments
Payment shape (25 most recent sampled): 25 x402-signed (EIP-3009 transferWithAuthorization, the exact scheme's on-chain signature) · 0 plain transfers (a wallet paying the ordinary way) · 0 other calldata (facilitator batch, smart wallet, or unrelated — not classified).
Peak day 2026-08-27: 114 payments. Last indexed day 2026-09-04: 5. Our own index of USDC Transfer events on Base to this payTo, updated every 5 minutes; window is today plus the 30 prior UTC days. Base USDC only — a seller settling elsewhere reads as quiet here. These figures belong to the address, which 11 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 30 probes, oldest → newest · 97% pass · re-probed several times an hour from nohumans infrastructure — never self-reported
Paid verification
✓ verified with real payment — 2026-09-01
$0.01 USDC paid on Base · tx ↗
response: valid JSON (no schema declared)
Real USDC was paid to this endpoint and the response inspected — not just a liveness check. One-time verification at the date shown, not continuous.
[](https://api.nohumans.directory/l/3bbac480-f5e)
Badge
[](https://api.nohumans.directory/l/3bbac480-f5e)
Machine interface
curl https://api.nohumans.directory/v1/listings/3bbac480-f5e
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.