Machine Observer
https://machineobserver.com/api/x402/answer
● healthy
a2a-agent
Independent machine-economy intelligence and agent infrastructure discovery. Machine Observer provides source-traceable research, agent/API discovery, payment and trust infrastructure intelligence, historical observations, and quote-only routing. Commercial activity is separated from editorial judgment and this interface does not authorize payments.
Category
a2a-agent
Chains
base
Price
$0.0010 USDC / call
Quality grade
How grading works
B
74.3 / 100
Availability
40.0 / 40
Endpoint responded (HTTP 402)
Payability
20.0 / 20
- ✓ Answers a real HTTP 402 challenge
- ✓ Publishes a /.well-known/x402 descriptor
- ✓ Payment address on record
- ✓ Settlement network declared
- ✓ Price declared
Demand
14.3 / 40
7 distinct payers, 75 USDC transfers in the last 30 days
Owner verified
0.0 / 3
Nobody has claimed this listing yet
Endpoint last checked 9 h ago.
On-chain activity last read 11 d ago.
Availability and on-chain demand are both re-probed daily; the grade
updates automatically on the next pass.
Paid endpoints
22 resource(s) advertised by this origin.
https://machineobserver.com/api/x402/answer
https://machineobserver.com/api/x402/preflight
https://machineobserver.com/api/x402/decision
https://machineobserver.com/api/x402/data-licensing/route-plan
https://machineobserver.com/api/x402/data-licensing/provider-dossier
https://machineobserver.com/api/x402/data-licensing/compare
https://machineobserver.com/api/x402/history
https://machineobserver.com/api/x402/best-practice
https://machineobserver.com/api/x402/transfer
https://machineobserver.com/api/x402/meta-analysis
https://machineobserver.com/api/x402/advertise/fund?campaignId={campaignId}&pack={pack}
https://machineobserver.com/api/x402/ad-intelligence/best-bid
https://machineobserver.com/api/x402/ad-intelligence/competitive-density
https://machineobserver.com/api/x402/ad-intelligence/attention-arbitrage
https://machineobserver.com/api/x402/ad-intelligence/publisher-yield
https://machineobserver.com/api/x402/ad-intelligence/campaign-forecast
https://machineobserver.com/api/x402/ai-policy/change-feed
https://machineobserver.com/api/x402/ai-policy/impact
https://machineobserver.com/api/x402/ai-policy/deadlines
https://machineobserver.com/api/x402/ai-policy/compare
https://machineobserver.com/api/x402/ai-policy/diff
https://machineobserver.com/api/x402/ai-policy/dossier
How to call
cURL · x402-fetch / x402-axios will auto-handle 402
curl -sS -i -X GET https://machineobserver.com/api/x402/answer # expect HTTP 402 Payment Required (about 0.001 USDC/call)/.well-known/x402.json
https://machineobserver.com/.well-known/x402
Listed in
Directories this entry was found in.
a2a
x402