Keystone Opportunity API

https://keystone-opportunity-api.keystone-opportunity.wor...

Probe an x402 URL without paying it: validate the live HTTP 402 challenge, v2 payment schema, Base USDC amount, payTo/network fields, and OpenAPI-to-live price consistency.

Crypto & DeFibase#221agentstaskmarketopportunitiesbaseusdcx402conformancevalidatoropenapipayments

Category rank

#221

Price

$0.01

Calls · 30d

Unique buyers · 30d

What's costing you points

Points earned against points available, biggest lever first.

Volume2.3 / 40

Buyer diversity3.8 / 25

Listing quality12.4 / 15

Recency15 / 15

Reliability2.5 / 5

Competitors in Crypto & DeFi

Rank	Service	Score	Volume	Price
#1	EAS attestations−31	67	4.7K txns	$0.0020
#2	WaterPulse−30	66	1.6K txns	$0.15

What to fix

mediumIncrease transaction volume to improve your ranking signals