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CentRake

https://centrake.biz
● down client-examples

AI-powered universal calculator with 3-layer self-correcting verification engine. 5-tier dynamic pricing: $0.01 basic solve, $0.05 verified solve (calculus/finance), $0.10 research solve (proofs/theorems), $0.15 AI action plans, $0.02 AI search. 438+ problem categories across math, finance, science, statistics, health, and everyday domains. Free for humans, paid for AI agents. USDC on Base. [Discovery](https://centrake.biz/api/.well-known/x402) | [Pricing](https://centrake.biz/api/x402/tiers) | [Info](https://centrake.biz/api/x402/info)

Category
client-examples
Chains
—
Price
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Quality grade

How grading works
E 0.0 / 100 capped at D while down
Availability 0.0 / 40
Endpoint did not respond
Payability 0.0 / 20
  • ✗ Answers a real HTTP 402 challenge
  • ✗ Publishes a /.well-known/x402 descriptor
  • ✗ Payment address on record
  • ✗ Settlement network declared
  • ✗ Price declared
Demand 0.0 / 40
No payment address on record, so demand cannot be measured
Owner verified 0.0 / 3
Nobody has claimed this listing yet
Endpoint last checked 11 h ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402
curl -X POST https://centrake.biz

Listed in

Directories this entry was found in.

awesome-x402