api.fairseal.io

api.fairseal.io · 1 paid endpoint · listed 2026-10-27

Notarize an AI agent decision, audit record, or any payload to Base mainnet. Submit SHA-256 hash + metadata; get a tamper-proof verifiable receipt immediately. Merkle proof and on-chain anchor_tx available free after batch (~120s). Use Idempotency-Key to prevent double-charges on retry.

livelast check 5 days ago

100%valid x402 answers, 72 h

$0.761USDC received on Base, 7 days

4distinct payers, 7 days

56.5score (0-100)

Paid endpoints

Method	Endpoint	Price	Networks
POST	api.fairseal.io/v1/notarize Notarize an AI agent decision, audit record, or any payload to Base mainnet. Submit SHA-256 hash + metadata; get a tamper-proof verifiable receipt immediately.	$0.05	Base

Latest checks

When	Endpoint	HTTP	ms	Result
5 days ago	api.fairseal.io/v1/notarize	402	203	valid x402 v2 terms

Income on Base (7 days)

Day	Transfers	USDC
2026-11-01	1	$0.001
2026-10-31	5	$0.10
2026-10-29	1	$0.001
2026-10-27	68	$0.659

Is this your API?

Add the live badge to your docs:

<a href="https://logicnodes.io/observatory/p/api.fairseal.io"><img src="https://logicnodes.io/observatory/badge/api.fairseal.io.svg" alt="x402 status"></a>

Claim it for free with x402_provider_claim (sign with your payout address), and get an alert within minutes when it stops answering with x402_monitor_create ($5 for 30 days). Both work over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/<tool>.

Income is all USDC received by the provider's payout address on Base, whatever the source. Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. JSON: /v1/observatory/providers/api.fairseal.io