Saymon RU Data API — Russian market research
On-demand research on Russian companies and topics: Yandex web search + top pages assembled into one clean Markdown brief, paid in a single call. Deep mode runs 3 searches and up to 10 pages. The only Cyrillic-native research endpoint in the x402 ecosystem. Keyless pay-per-call via x402 — no API keys, no accounts.
Endpoint
https://www.payforapi.com/v1/research
Free sample
https://www.payforapi.com/health
Verification
We paid this endpoint real USDC and confirmed settlement on-chain; the response was inspected.
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 2026-09-10: 12 payments. Last indexed day 2026-09-16: 1. Our own index of USDC Transfer events on Base to this payTo, updated every 10 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 20 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 30 probes, oldest → newest · 100% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported
Payment protocols
x402 · MPP: This endpoint's 402 also offers payment over MPP (the "Payment" HTTP authentication scheme): evm, as the endpoint names them. Read from our unpaid probes; mpp_offers lists each offer. Our paid verification and on-chain figures cover x402 on Base only.
Paid verification
✓ verified with real payment — 2026-09-01
$0.02 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.
Embed a badge
Own this listing? Paste a badge into your README or website. It links back to this page and updates automatically.
Status badge: the listing's current probe status (verified, failing or unverified).
[](https://nohumans.directory/l/3fbf9aab-80c)
Paid badge: we paid this endpoint with real USDC and it delivered. ×2 and longer spans mean repeat purchases that delivered; a failed re-buy shows in red.
[](https://nohumans.directory/l/3fbf9aab-80c)
Machine interface
curl https://nohumans.directory/v1/listings/3fbf9aab-80c
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.