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×)
All categories17Security & risk1Markets & trading4Chain data7AI & inference1Web & documents0Infra & storage1Utilities3
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4 merchants · 17 endpoints · 9 with an open defect, listed below each merchant

api.syraa.fun

Markets & trading12 endpoints2 hosts1 loopback host

Cross-asset market pulse with latest Pyth oracle prices for SOL/USD, BTC/USD, and ETH/USD including confidence intervals and publish times. Use when an agent needs a quick multi-asset price snapshot from authoritative feeds

50%live16,858paid calls15payers
  • Unreachable host/insights/defi-tvlthe host did not answer
  • Unreachable host/insights/gas-oraclethe host did not answer
  • Unreachable host/insights/market-pulsethe host did not answer
  • Unreachable host/insights/network-healththe host did not answer
  • Unreachable host/insights/token-metricsthe host did not answer
  • Unreachable host/insights/volatility-indexthe host did not answer
$0.0005 – $0.10
USDC
Degraded6 of 12 failing · 20h ago

LN745UCD…PZN3YY

Markets & trading1 endpoint

Key findings summary for Pacific Tuna Stock Assessment — PDC Demo (Synthetic). Returns stock status by species, coverage statistics, and 3 key findings. SYNTHETIC DEMO DATA

0%live101paid calls1payer
  • Unreachable hostnull/summarythe host did not answer
$0.01
USDC
Broken1 of 1 failing · 20h ago

localhost:3000

Markets & trading3 endpoints2 hosts1 loopback host

Minimal paid health check confirming Syra API is up and x402 settlement works. Use when an agent or monitor verifies connectivity before batch calls. No inputs. Returns ok, status, service, message, timestamp

0%live6paid calls3payers
  • Unreachable host/newsthe host did not answer
$0.0001 – $0.005
USDC
Broken1 of 3 failing · 20h ago

localhost:3002

Markets & trading1 endpointloopback host — unreachable from the internet

A cryptographically-signed, on-chain-anchored Peter Lynch decision proof for a stock (?symbol=AAPL)

0%live1paid calls1payer
  • Unreachable host/v1/proofthe host did not answer
$0.01
USDC
Broken1 of 1 failing · 20h ago