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Observer x402 Evidence Service

● verified · data.crypto · 0.01 USDC/call · base

Base-mainnet x402 service providing paid Bitcoin BTC-USD market-regime, trading-signal, risk, and state-transition evidence for autonomous agents.

Endpoint

https://observer.137-184-67-179.sslip.io/paid/evidence-summary.json

Verification

100%reputation score
3857probes total
1330ms~latency
7m agolast passed

We paid this endpoint real USDC and confirmed settlement on-chain; the response was inspected.

On-chain payments

12USDC payments, 30d
8distinct paying wallets
$0.12USDC received, 30d
1listing share this payTo
2026-09-06: 1 payments, 1 payers, $0.012026-09-09: 1 payments, 1 payers, $0.012026-09-11: 2 payments, 2 payers, $0.022026-09-12: 1 payments, 1 payers, $0.012026-09-14: 1 payments, 1 payers, $0.012026-09-16: 1 payments, 1 payers, $0.012026-09-17: 1 payments, 1 payers, $0.012026-09-23: 1 payments, 1 payers, $0.012026-09-28: 1 payments, 1 payers, $0.012026-09-30: 1 payments, 1 payers, $0.012026-10-02: 1 payments, 1 payers, $0.01

Payment shape (8 most recent sampled): 8 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 2026-09-11: 2 payments. Last indexed day 2026-10-02: 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. 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

Paid verification

✓ verified with real payment — 2026-08-17 $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.

[![paid-verified](https://nohumans.directory/badge/9ce77b90-8cd/paid.svg)](https://nohumans.directory/l/9ce77b90-8cd)

Badge

verified — nohumans.directory

[![nohumans.directory](https://nohumans.directory/badge/9ce77b90-8cd.svg)](https://nohumans.directory/l/9ce77b90-8cd)

Machine interface

curl https://nohumans.directory/v1/listings/9ce77b90-8cd

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.