Tested plans for agentic businesses.

Sell one existing HTTP route with x402 V2

Outcome

This plan adds a $0.50 x402 V2 payment gate to one existing FastAPI GET route.

The route accepts Base USDC through the CDP facilitator. Its first 402 challenge includes CDP Bazaar discovery metadata.

The final proof is an HTTP 200 response, a settlement receipt, and a successful Base transaction.

This plan does not contain a code package. It contains commands and code blocks that you apply to your API.

Tested environment

Friction sections

• Friction 1: Pin the environment before you edit the route
• Friction 2: The receiver does not need a hot key
• Friction 3: Store the facilitator keys without exposing them
• Friction 4: FastAPI and x402 use different path-parameter syntax
• Friction 5: Make sure that the 402 occurs before request validation
• Friction 6: Read the amount from the V2 header
• Friction 7: Use a separate buyer with a hard cap
• Friction 8: Bazaar indexing starts after settlement

23 acceptance checks

View the complete order on BaseScan

Buy Sell one existing HTTP route with x402 V2 for $0.50.

Use one of these paid GET routes:
- https://krimskrams.xyz/v1/plans/plan-1-sell-one-route-x402-v2 over x402 on Base USDC
- https://krimskrams.xyz/mpp/v1/plans/plan-1-sell-one-route-x402-v2 over MPP on Tempo

JSON catalog slug: plan-1-sell-one-route-x402-v2

Sell one existing HTTP route with MPP

Outcome

This plan adds a $0.50 MPP payment gate to one existing FastAPI GET route.

The route accepts USDC.e on Tempo mainnet. The seller verifies and settles the payment through the public Tempo RPC.

The final proof is an HTTP 200 response, an MPP receipt, and a successful public Tempo transaction.

This plan does not contain a code package. It contains commands and code blocks that you apply to your API.

For the Base x402 rail, use the [x402 companion plan](./plan-1-sell-one-route-x402-v2.md).

Tested environment

Friction sections

• Friction 1: Pin the environment before you edit the route
• Friction 2: Keep the recipient key off the API host
• Friction 3: Protect the MPP server secret
• Friction 4: Put validation before settlement
• Friction 5: Publish the route manifest
• Friction 6: Inspect the Payment challenge
• Friction 7: Use a capped buyer for the live test
• Friction 8: Verify the settlement through the Tempo RPC

0 acceptance checks

No BaseScan order is listed.

Draft. This plan is not available for purchase.

JSON catalog slug: plan-3-sell-one-route-mpp

List one x402/MPP route on the discovery indexes

Outcome

This plan makes one paid route readable by x402 and MPP discovery systems.

The route gets two manifests, a public OpenAPI document, and entries on x402scan and MPPScan.

CDP Bazaar catalogs the x402 route after its first settled payment. It has no registration form or registration API.

First, sell the route with the [x402 seller plan](./plan-1-sell-one-route-x402-v2.md) or the [MPP seller plan](./plan-3-sell-one-route-mpp.md).

This plan does not contain a code package. It contains commands and JSON blocks that you apply to your API.

Tested environment

Friction sections

• Friction 1: Publish the x402 well-known manifest
• Friction 2: Publish the MPP manifest
• Friction 3: Keep the OpenAPI document on
• Friction 4: Register the x402 route on x402scan
• Friction 5: Register the MPP origin on MPPScan
• Friction 6: CDP Bazaar starts after settlement

0 acceptance checks

No BaseScan order is listed.

Draft. This plan is not available for purchase.

JSON catalog slug: plan-4-list-one-route-discovery-indexes