# OnTopX402 API

**Canonical:** https://apis.io/apis/ontopx402/ontopx402-api/  
**Provider:** OnTopX402 — https://apis.io/providers/ontopx402/  
**Base URL:** https://ontopx402.com  
**Documentation:** https://ontopx402.com/

OnTopX402 API is published by [OnTopX402](https://apis.io/providers/ontopx402/) on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include x402, Agent Commerce, and Advertising. The published artifact set on APIs.io includes an OpenAPI specification, an API reference, and API documentation.

Read the leaderboard, read a single entry, and bid for rank. GET /api/leaderboard returns the board unauthenticated; POST /api/bid returns an x402 payment challenge rather than requiring an account.

## Machine-readable artifacts (6)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/ontopx402/refs/heads/main/openapi/ontopx402-api-openapi.yml
- **APIReference** — https://ontopx402.com/openapi.json
- **Documentation** — https://ontopx402.com/
- **FinOps** — https://raw.githubusercontent.com/api-evangelist/ontopx402/refs/heads/main/finops/ontopx402-x402-challenge.json
- **Examples** — https://raw.githubusercontent.com/api-evangelist/ontopx402/refs/heads/main/examples/ontopx402-leaderboard-example.json
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/ontopx402/refs/heads/main/apis.yml

## Tags

x402, Agent Commerce, Advertising

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/ontopx402/ontopx402-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/ontopx402/.