Paid service
Carbon Intensity API
Replaceable with a real provider later
X402 payment simulation
Autonomous paid specialist audit
A realistic X402-style flow shows how an agent can discover a paid API, evaluate budget, send payment, and log a receipt.
API price
$4
Returned by HTTP 402 metadata
Agent budget
$12
Autonomous spend policy
Receipt
ackend_042
Logged in repair ledger
Payment flow
01Agentcompleted
Agent requests premium carbon data
The Carbon Accountant Agent asks for regional carbon intensity factors to refine the estimate.
GET /v1/carbon-intensity/premium?audit=bloated-saas-backend
02Paid APIHTTP 402completed
API returns HTTP 402 Payment Required
The API exposes a machine-readable price of $3.50 for a premium audit result.
03Budget policyapproved
Agent checks budget policy
Approved because $3.50 is within the $12.00 autonomous spend limit.
04Agentcompleted
Agent signs mock payment
A replaceable mock signer creates an X402-style payment payload for the paid service.
05Agentcompleted
Agent retries with X-PAYMENT header
The agent retries the same resource request with payment authorization attached.
GET /v1/carbon-intensity/premium
06Paid APIHTTP 200completed
API returns premium audit result
Premium data confirms 92 kgCO2e/month of avoidable waste with regional adjustment factors.
07Ledgerlogged
Receipt logged in repair ledger
Receipt rcpt_x402_bloated_saas_backend_042 is attached to the repair ledger for auditability and finance review.