The freedom to leave.
Create a durable wait, exit the process, and retrieve the exact payment evidence later.
Algorand × x402 × USDC payment monitoring
Agents do the work.
We prove they
got paid.
RoundWatch lets agents create a durable watch for one exact future Algorand MainNet USDC payment, exit, and retrieve verified on-chain evidence later.
Live on Algorand MainNet · x402 v2
A workflow that keeps going.
Infrastructure for the next action
- MainNet watch0.10 USDC
- Durable watch stateSurvives restarts
- Exact matchingEvidence, not inference
- Built for agentsCaller can exit
01/Product
Reliable continuity
for autonomous work.
Work can be autonomous.
Trust needs a foundation.
01
Watches one exact future MainNet USDC payment within a bounded window.
02
Matches sender, receiver, asset, atomic amount, and optional invoice note.
03
Watch state and scan progress survive process restarts and redeploys.
Expected paymentDurable watchVerified evidence
02/Legacy demo
Watch RoundWatch
in action.
This MainNet recording shows the watch lifecycle on an earlier release, before the November 2026 x402 SDK update.
03/The flow
Create the watch once.
Retrieve the evidence later.
The caller does not have to stay alive
just to keep checking the chain.
- 01
Discover and check the offer
Request the free x402 offer. Check its terms and your watch specification before signing.
- 02
Settle the x402 service fee
Sign locally and submit the watch request with the x402 payment signature.
- 03
RoundWatch owns the wait
After settlement is confirmed on-chain, RoundWatch activates the watch and saves its scan progress.
- 04
Match & retrieve evidence
Retrieve the watch result, including the transaction ID and confirmed round when a transfer matches.
Stage 03 / RoundWatch owns the wait
- Status
- Watch active
- Boundary
- Future payment not matched
- Next
- Observe MainNet
The caller can exit after activation. RoundWatch can resume from the saved cursor after a restart and reconcile settlement when activation is interrupted.
04/Technology
Deterministic where it matters.
Intelligent where it helps.
The deterministic core
Evidence first.
Every next step, grounded.
Settlement and payment matching are established by deterministic infrastructure. A language model does not decide whether a payment settled or matched.
- x402 service settlement
- Confirmed service-payment round
- Durable watch state
- Persistent scan cursor
- Restart recovery
- Exact future-payment matching
MainNet API live. Canonical payment flow tested end to end on TestNet.
Technical guideHow to monitor a future Algorand USDC payment05/Lifecycle replay
Follow the watch
from request to evidence.
An illustrative replay of the canonical TestNet lifecycle, one durable state transition at a time.
- 10:24:01[watch]
- 10:24:02[x402]
- 10:24:05[settlement]
- 10:24:08[state]
- 10:25:11[observer]
- 10:25:11[evidence]
Ready
Matched.
Persisted.
Ready to retrieve.
06 / 06 Durable evidence ready
Simulated timestamps and events illustrate the recorded TestNet flow. The replay runs locally.
06/Resilience
Restart the server.
Keep the truth.
A process can stop. Its evidence shouldn’t disappear with it.
RoundWatch restores durable state and resumes from saved observation progress. A future payment can still be detected after restart.
Restart recovery covered by automated fault testspersistence confirmed in earlier MainNet redeploys
Process changes. Evidence remains.
- Payment expected
- Scan progress savedSaved
- Server stopsProcess offline
- Server starts
- State restoredRecovered
- Observation resumes
- Future payment detectedMatched
07/Why it matters
A more reliable
agent economy.
A clearer payment boundary.
Separate caller lifetime from the infrastructure that owns observation and durable evidence.
State that outlasts a process.
Use persisted watch state and scan progress instead of keeping a worker alive just to poll.
Open standards. Verifiable state. Durable execution.The production stack behind every watch.
AlgorandMainNet settlement✳x402Payment protocol✳GoPlausibleSettlement facilitator✳RenderService runtime✳SQLiteDurable state✳
Operational proof
Live evidence.
Durable state.
Algorand MainNet
x402 v2 · SDK 2.29.0 · Circle USDC
The November 9, 2026 MainNet release passed health, readiness, and unsigned canonical HTTP 402 checks. The same SDK version settled a real TestNet service payment and matched a separate USDC transfer. A paid MainNet run on this release is still pending.
An earlier MainNet canary settled the service fee and matched a separate USDC transfer. The current watch costs 0.10 USDC and has a 30-minute eligibility window from durable preparation and a 500-work-unit budget.
The next action starts with trust