Search
Find candidates across supported x402 discovery sources.
Find a paid API that works right now.
402Signal checks x402 endpoints before you spend. It compares the payment terms it sees now against your constraints and returns the best match, or a clear reason nothing qualified.
You keep your wallet and keys. 402Signal never pays the selected service for you.
Base · Solana · Algorand
$0.01 USDC per routing check
How it works
Check
Call candidate endpoints and read the payment requirements they return now.
Match
Apply your network, price, latency, and invocation constraints.
Return
Get the best qualifying route, or a typed reason nothing matched.
Check before you spend
Discovery data gets stale. 402Signal checks the endpoint at routing time instead of relying only on what a directory says.
See what changed
The result separates seller claims from what 402Signal observed.
Keep control
Your application keeps the wallet, signing, seller payment, and execution.
Fail clearly
If nothing meets your constraints, 402Signal returns a typed miss instead of guessing.
Algorand MainNet
Awaiting anchor
Verifiable routing history
402Signal commits routing evidence to an append-only log.
Published checkpoints make later changes to the recorded history detectable.
402Signal recommends. You execute.
402Signal finds and checks the route. Your application keeps control of its wallet, signs the seller payment, and calls the selected service.
Listed in
Directory links show where 402Signal is listed. They are not endorsements.
Glama MCP Registry Gold-402 Smithery Agentic Market x402-dev GoPlausible