# Cypher AI developer resources

- Human API reference: https://cypherapp.io/developers
- OpenAPI contract: https://cypherapp.io/api/openapi.yaml
- Agent operating guide: https://cypherapp.io/skills/cypher-api/SKILL.md
- Postman collection: https://cypherapp.io/api/cypher-public-api.postman_collection.json
- API keys and MCP setup: https://cypherapp.io/api-mcp
- Pricing: https://cypherapp.io/pricing.json
- Receipt public key: https://cypherapp.io/developers/receipt-public-key.pem
- Pay-per-call (x402): https://cypherapp.io/developers#x402