Assay

Every paid API on Algorand, tested rather than listed.

861 x402 endpoints from 39 merchants across 46 hosts — each one called on a schedule to check it answers, that its 402 challenge parses, and that it charges what it advertises.

Endpoints live
773
Open defects
85
Overcharging
8
Paid calls
28,684
Last sweep
19h ago · 100% covered
Buyer reviews
none yet
8 endpoints charge more than they advertiseworst: api.micropay.website/api/v1/images/generations lists $0.01, demands $0.50 (50×)

7 merchants · 549 endpoints

agent402.tools

Utilities514 endpoints

Cryptographic hash of a text string. Algorithms: sha256 (default), sha512, sha1, md5. Returns hex and base64 digests

98%live2,089paid calls4payers
$0.001 – $1.50
USDC
Pays elsewhere2 rerouted · 19h ago2 above list8 of 514 failing

canix402-api.compx.io

Utilities14 endpoints

canix402 paid execution quote endpoint

100%live1,713paid calls9payers
$0.005 – $0.10
USDC
Verified14/14 answered · 19h ago

head-hive.fly.dev

Utilities6 endpoints

Quick Answer — Single expert agent answers a question directly. Cheapest tier, no team fan-out

0%live207paid calls2payers
$0.002 – $0.10
USDC
Broken6 of 6 failing · 19h ago

Adjudicate one agent job: validate the evidence envelope, convene the verifier quorum, and settle release-or-slash atomically

100%live29paid calls4payers
$0.005
USDC
Verified1/1 answered · 19h ago

second-opinion-production.up.railway.app

Utilities8 endpoints2 hosts

Second Opinion quick: an independent reasoning-only check (no web research) of your claim's logic and consistency with established knowledge. Honest 'inconclusive' when the claim needs live research

37%live23paid calls3payers
$0.03 – $0.25
USDC
Broken5 of 8 failing · 19h ago2 above list

validpay-production.up.railway.app

Utilities2 endpoints2 hosts

Open-Meteo proxy with JSON contract: invalid coordinates → settlement canceled (buyer not charged); valid coords → current temperature_2m + weather_code forecast JSON

100%live10paid calls3payers
$0.001
USDC
Verified2/2 answered · 20h ago

algo.ochinimus.app

Utilities4 endpoints

Forced liquidation volume for one symbol over a recent window, split by exchange and by whether longs or shorts were liquidated

100%live9paid calls3payers
$0.02 – $0.10
USDC
Verified4/4 answered · 20h ago